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authorMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
committerMatt A. Tobin <mattatobin@localhost.localdomain>2018-02-02 04:16:08 -0500
commit5f8de423f190bbb79a62f804151bc24824fa32d8 (patch)
tree10027f336435511475e392454359edea8e25895d /dom/events/EventStateManager.cpp
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'dom/events/EventStateManager.cpp')
-rw-r--r--dom/events/EventStateManager.cpp6002
1 files changed, 6002 insertions, 0 deletions
diff --git a/dom/events/EventStateManager.cpp b/dom/events/EventStateManager.cpp
new file mode 100644
index 000000000..659629066
--- /dev/null
+++ b/dom/events/EventStateManager.cpp
@@ -0,0 +1,6002 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "mozilla/Attributes.h"
+#include "mozilla/EventDispatcher.h"
+#include "mozilla/EventStateManager.h"
+#include "mozilla/EventStates.h"
+#include "mozilla/IMEStateManager.h"
+#include "mozilla/MiscEvents.h"
+#include "mozilla/MathAlgorithms.h"
+#include "mozilla/MouseEvents.h"
+#include "mozilla/TextComposition.h"
+#include "mozilla/TextEvents.h"
+#include "mozilla/TouchEvents.h"
+#include "mozilla/dom/ContentChild.h"
+#include "mozilla/dom/DragEvent.h"
+#include "mozilla/dom/Event.h"
+#include "mozilla/dom/TabChild.h"
+#include "mozilla/dom/TabParent.h"
+#include "mozilla/dom/UIEvent.h"
+
+#include "ContentEventHandler.h"
+#include "IMEContentObserver.h"
+#include "WheelHandlingHelper.h"
+
+#include "nsCOMPtr.h"
+#include "nsFocusManager.h"
+#include "nsIContent.h"
+#include "nsIContentInlines.h"
+#include "nsIDocument.h"
+#include "nsIFrame.h"
+#include "nsIWidget.h"
+#include "nsPresContext.h"
+#include "nsIPresShell.h"
+#include "nsGkAtoms.h"
+#include "nsIFormControl.h"
+#include "nsIComboboxControlFrame.h"
+#include "nsIScrollableFrame.h"
+#include "nsIDOMHTMLElement.h"
+#include "nsIDOMXULControlElement.h"
+#include "nsNameSpaceManager.h"
+#include "nsIBaseWindow.h"
+#include "nsISelection.h"
+#include "nsITextControlElement.h"
+#include "nsFrameSelection.h"
+#include "nsPIDOMWindow.h"
+#include "nsPIWindowRoot.h"
+#include "nsIWebNavigation.h"
+#include "nsIContentViewer.h"
+#include "nsFrameManager.h"
+#include "nsITabChild.h"
+#include "nsPluginFrame.h"
+#include "nsMenuPopupFrame.h"
+
+#include "nsIDOMXULElement.h"
+#include "nsIDOMKeyEvent.h"
+#include "nsIObserverService.h"
+#include "nsIDocShell.h"
+#include "nsIDOMWheelEvent.h"
+#include "nsIDOMUIEvent.h"
+#include "nsIMozBrowserFrame.h"
+
+#include "nsSubDocumentFrame.h"
+#include "nsLayoutUtils.h"
+#include "nsIInterfaceRequestorUtils.h"
+#include "nsUnicharUtils.h"
+#include "nsContentUtils.h"
+
+#include "imgIContainer.h"
+#include "nsIProperties.h"
+#include "nsISupportsPrimitives.h"
+
+#include "nsServiceManagerUtils.h"
+#include "nsITimer.h"
+#include "nsFontMetrics.h"
+#include "nsIDOMXULDocument.h"
+#include "nsIDragService.h"
+#include "nsIDragSession.h"
+#include "mozilla/dom/DataTransfer.h"
+#include "nsContentAreaDragDrop.h"
+#ifdef MOZ_XUL
+#include "nsTreeBodyFrame.h"
+#endif
+#include "nsIController.h"
+#include "nsICommandParams.h"
+#include "mozilla/Services.h"
+#include "mozilla/dom/ContentParent.h"
+#include "mozilla/dom/HTMLLabelElement.h"
+
+#include "mozilla/Preferences.h"
+#include "mozilla/LookAndFeel.h"
+#include "GeckoProfiler.h"
+#include "Units.h"
+#include "mozilla/layers/APZCTreeManager.h"
+
+#ifdef XP_MACOSX
+#import <ApplicationServices/ApplicationServices.h>
+#endif
+
+namespace mozilla {
+
+using namespace dom;
+
+//#define DEBUG_DOCSHELL_FOCUS
+
+#define NS_USER_INTERACTION_INTERVAL 5000 // ms
+
+static const LayoutDeviceIntPoint kInvalidRefPoint = LayoutDeviceIntPoint(-1,-1);
+
+static uint32_t gMouseOrKeyboardEventCounter = 0;
+static nsITimer* gUserInteractionTimer = nullptr;
+static nsITimerCallback* gUserInteractionTimerCallback = nullptr;
+
+static const double kCursorLoadingTimeout = 1000; // ms
+static nsWeakFrame gLastCursorSourceFrame;
+static TimeStamp gLastCursorUpdateTime;
+
+static inline int32_t
+RoundDown(double aDouble)
+{
+ return (aDouble > 0) ? static_cast<int32_t>(floor(aDouble)) :
+ static_cast<int32_t>(ceil(aDouble));
+}
+
+#ifdef DEBUG_DOCSHELL_FOCUS
+static void
+PrintDocTree(nsIDocShellTreeItem* aParentItem, int aLevel)
+{
+ for (int32_t i=0;i<aLevel;i++) printf(" ");
+
+ int32_t childWebshellCount;
+ aParentItem->GetChildCount(&childWebshellCount);
+ nsCOMPtr<nsIDocShell> parentAsDocShell(do_QueryInterface(aParentItem));
+ int32_t type = aParentItem->ItemType();
+ nsCOMPtr<nsIPresShell> presShell = parentAsDocShell->GetPresShell();
+ RefPtr<nsPresContext> presContext;
+ parentAsDocShell->GetPresContext(getter_AddRefs(presContext));
+ nsCOMPtr<nsIContentViewer> cv;
+ parentAsDocShell->GetContentViewer(getter_AddRefs(cv));
+ nsCOMPtr<nsIDOMDocument> domDoc;
+ if (cv)
+ cv->GetDOMDocument(getter_AddRefs(domDoc));
+ nsCOMPtr<nsIDocument> doc = do_QueryInterface(domDoc);
+ nsCOMPtr<nsIDOMWindow> domwin = doc ? doc->GetWindow() : nullptr;
+ nsIURI* uri = doc ? doc->GetDocumentURI() : nullptr;
+
+ printf("DS %p Type %s Cnt %d Doc %p DW %p EM %p%c",
+ static_cast<void*>(parentAsDocShell.get()),
+ type==nsIDocShellTreeItem::typeChrome?"Chrome":"Content",
+ childWebshellCount, static_cast<void*>(doc.get()),
+ static_cast<void*>(domwin.get()),
+ static_cast<void*>(presContext ? presContext->EventStateManager() : nullptr),
+ uri ? ' ' : '\n');
+ if (uri) {
+ nsAutoCString spec;
+ uri->GetSpec(spec);
+ printf("\"%s\"\n", spec.get());
+ }
+
+ if (childWebshellCount > 0) {
+ for (int32_t i = 0; i < childWebshellCount; i++) {
+ nsCOMPtr<nsIDocShellTreeItem> child;
+ aParentItem->GetChildAt(i, getter_AddRefs(child));
+ PrintDocTree(child, aLevel + 1);
+ }
+ }
+}
+
+static void
+PrintDocTreeAll(nsIDocShellTreeItem* aItem)
+{
+ nsCOMPtr<nsIDocShellTreeItem> item = aItem;
+ for(;;) {
+ nsCOMPtr<nsIDocShellTreeItem> parent;
+ item->GetParent(getter_AddRefs(parent));
+ if (!parent)
+ break;
+ item = parent;
+ }
+
+ PrintDocTree(item, 0);
+}
+#endif
+
+// mask values for ui.key.chromeAccess and ui.key.contentAccess
+#define NS_MODIFIER_SHIFT 1
+#define NS_MODIFIER_CONTROL 2
+#define NS_MODIFIER_ALT 4
+#define NS_MODIFIER_META 8
+#define NS_MODIFIER_OS 16
+
+/******************************************************************/
+/* mozilla::UITimerCallback */
+/******************************************************************/
+
+class UITimerCallback final : public nsITimerCallback
+{
+public:
+ UITimerCallback() : mPreviousCount(0) {}
+ NS_DECL_ISUPPORTS
+ NS_DECL_NSITIMERCALLBACK
+private:
+ ~UITimerCallback() {}
+ uint32_t mPreviousCount;
+};
+
+NS_IMPL_ISUPPORTS(UITimerCallback, nsITimerCallback)
+
+// If aTimer is nullptr, this method always sends "user-interaction-inactive"
+// notification.
+NS_IMETHODIMP
+UITimerCallback::Notify(nsITimer* aTimer)
+{
+ nsCOMPtr<nsIObserverService> obs =
+ mozilla::services::GetObserverService();
+ if (!obs)
+ return NS_ERROR_FAILURE;
+ if ((gMouseOrKeyboardEventCounter == mPreviousCount) || !aTimer) {
+ gMouseOrKeyboardEventCounter = 0;
+ obs->NotifyObservers(nullptr, "user-interaction-inactive", nullptr);
+ if (gUserInteractionTimer) {
+ gUserInteractionTimer->Cancel();
+ NS_RELEASE(gUserInteractionTimer);
+ }
+ } else {
+ obs->NotifyObservers(nullptr, "user-interaction-active", nullptr);
+ EventStateManager::UpdateUserActivityTimer();
+ }
+ mPreviousCount = gMouseOrKeyboardEventCounter;
+ return NS_OK;
+}
+
+/******************************************************************/
+/* mozilla::OverOutElementsWrapper */
+/******************************************************************/
+
+OverOutElementsWrapper::OverOutElementsWrapper()
+ : mLastOverFrame(nullptr)
+{
+}
+
+OverOutElementsWrapper::~OverOutElementsWrapper()
+{
+}
+
+NS_IMPL_CYCLE_COLLECTION(OverOutElementsWrapper,
+ mLastOverElement,
+ mFirstOverEventElement,
+ mFirstOutEventElement)
+NS_IMPL_CYCLE_COLLECTING_ADDREF(OverOutElementsWrapper)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(OverOutElementsWrapper)
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(OverOutElementsWrapper)
+ NS_INTERFACE_MAP_ENTRY(nsISupports)
+NS_INTERFACE_MAP_END
+
+/******************************************************************/
+/* mozilla::EventStateManager */
+/******************************************************************/
+
+static uint32_t sESMInstanceCount = 0;
+static bool sPointerEventEnabled = false;
+
+uint64_t EventStateManager::sUserInputCounter = 0;
+int32_t EventStateManager::sUserInputEventDepth = 0;
+bool EventStateManager::sNormalLMouseEventInProcess = false;
+EventStateManager* EventStateManager::sActiveESM = nullptr;
+nsIDocument* EventStateManager::sMouseOverDocument = nullptr;
+nsWeakFrame EventStateManager::sLastDragOverFrame = nullptr;
+LayoutDeviceIntPoint EventStateManager::sPreLockPoint = LayoutDeviceIntPoint(0, 0);
+LayoutDeviceIntPoint EventStateManager::sLastRefPoint = kInvalidRefPoint;
+CSSIntPoint EventStateManager::sLastScreenPoint = CSSIntPoint(0, 0);
+LayoutDeviceIntPoint EventStateManager::sSynthCenteringPoint = kInvalidRefPoint;
+CSSIntPoint EventStateManager::sLastClientPoint = CSSIntPoint(0, 0);
+bool EventStateManager::sIsPointerLocked = false;
+// Reference to the pointer locked element.
+nsWeakPtr EventStateManager::sPointerLockedElement;
+// Reference to the document which requested pointer lock.
+nsWeakPtr EventStateManager::sPointerLockedDoc;
+nsCOMPtr<nsIContent> EventStateManager::sDragOverContent = nullptr;
+TimeStamp EventStateManager::sLatestUserInputStart;
+TimeStamp EventStateManager::sHandlingInputStart;
+
+EventStateManager::WheelPrefs*
+ EventStateManager::WheelPrefs::sInstance = nullptr;
+bool EventStateManager::WheelPrefs::sWheelEventsEnabledOnPlugins = true;
+EventStateManager::DeltaAccumulator*
+ EventStateManager::DeltaAccumulator::sInstance = nullptr;
+
+EventStateManager::EventStateManager()
+ : mLockCursor(0)
+ , mLastFrameConsumedSetCursor(false)
+ , mCurrentTarget(nullptr)
+ // init d&d gesture state machine variables
+ , mGestureDownPoint(0,0)
+ , mPresContext(nullptr)
+ , mLClickCount(0)
+ , mMClickCount(0)
+ , mRClickCount(0)
+ , mInTouchDrag(false)
+ , m_haveShutdown(false)
+{
+ if (sESMInstanceCount == 0) {
+ gUserInteractionTimerCallback = new UITimerCallback();
+ if (gUserInteractionTimerCallback)
+ NS_ADDREF(gUserInteractionTimerCallback);
+ UpdateUserActivityTimer();
+ }
+ ++sESMInstanceCount;
+
+ static bool sAddedPointerEventEnabled = false;
+ if (!sAddedPointerEventEnabled) {
+ Preferences::AddBoolVarCache(&sPointerEventEnabled,
+ "dom.w3c_pointer_events.enabled", false);
+ sAddedPointerEventEnabled = true;
+ }
+}
+
+nsresult
+EventStateManager::UpdateUserActivityTimer()
+{
+ if (!gUserInteractionTimerCallback)
+ return NS_OK;
+
+ if (!gUserInteractionTimer)
+ CallCreateInstance("@mozilla.org/timer;1", &gUserInteractionTimer);
+
+ if (gUserInteractionTimer) {
+ gUserInteractionTimer->InitWithCallback(gUserInteractionTimerCallback,
+ NS_USER_INTERACTION_INTERVAL,
+ nsITimer::TYPE_ONE_SHOT);
+ }
+ return NS_OK;
+}
+
+nsresult
+EventStateManager::Init()
+{
+ nsCOMPtr<nsIObserverService> observerService =
+ mozilla::services::GetObserverService();
+ if (!observerService)
+ return NS_ERROR_FAILURE;
+
+ observerService->AddObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID, true);
+
+ if (sESMInstanceCount == 1) {
+ Prefs::Init();
+ }
+
+ return NS_OK;
+}
+
+EventStateManager::~EventStateManager()
+{
+ ReleaseCurrentIMEContentObserver();
+
+ if (sActiveESM == this) {
+ sActiveESM = nullptr;
+ }
+ if (Prefs::ClickHoldContextMenu())
+ KillClickHoldTimer();
+
+ if (mDocument == sMouseOverDocument)
+ sMouseOverDocument = nullptr;
+
+ --sESMInstanceCount;
+ if(sESMInstanceCount == 0) {
+ WheelTransaction::Shutdown();
+ if (gUserInteractionTimerCallback) {
+ gUserInteractionTimerCallback->Notify(nullptr);
+ NS_RELEASE(gUserInteractionTimerCallback);
+ }
+ if (gUserInteractionTimer) {
+ gUserInteractionTimer->Cancel();
+ NS_RELEASE(gUserInteractionTimer);
+ }
+ Prefs::Shutdown();
+ WheelPrefs::Shutdown();
+ DeltaAccumulator::Shutdown();
+ }
+
+ if (sDragOverContent && sDragOverContent->OwnerDoc() == mDocument) {
+ sDragOverContent = nullptr;
+ }
+
+ if (!m_haveShutdown) {
+ Shutdown();
+
+ // Don't remove from Observer service in Shutdown because Shutdown also
+ // gets called from xpcom shutdown observer. And we don't want to remove
+ // from the service in that case.
+
+ nsCOMPtr<nsIObserverService> observerService =
+ mozilla::services::GetObserverService();
+ if (observerService) {
+ observerService->RemoveObserver(this, NS_XPCOM_SHUTDOWN_OBSERVER_ID);
+ }
+ }
+
+}
+
+nsresult
+EventStateManager::Shutdown()
+{
+ m_haveShutdown = true;
+ return NS_OK;
+}
+
+NS_IMETHODIMP
+EventStateManager::Observe(nsISupports* aSubject,
+ const char* aTopic,
+ const char16_t *someData)
+{
+ if (!nsCRT::strcmp(aTopic, NS_XPCOM_SHUTDOWN_OBSERVER_ID)) {
+ Shutdown();
+ }
+
+ return NS_OK;
+}
+
+NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(EventStateManager)
+ NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIObserver)
+ NS_INTERFACE_MAP_ENTRY(nsIObserver)
+ NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
+NS_INTERFACE_MAP_END
+
+NS_IMPL_CYCLE_COLLECTING_ADDREF(EventStateManager)
+NS_IMPL_CYCLE_COLLECTING_RELEASE(EventStateManager)
+
+NS_IMPL_CYCLE_COLLECTION(EventStateManager,
+ mCurrentTargetContent,
+ mGestureDownContent,
+ mGestureDownFrameOwner,
+ mLastLeftMouseDownContent,
+ mLastLeftMouseDownContentParent,
+ mLastMiddleMouseDownContent,
+ mLastMiddleMouseDownContentParent,
+ mLastRightMouseDownContent,
+ mLastRightMouseDownContentParent,
+ mActiveContent,
+ mHoverContent,
+ mURLTargetContent,
+ mMouseEnterLeaveHelper,
+ mPointersEnterLeaveHelper,
+ mDocument,
+ mIMEContentObserver,
+ mAccessKeys)
+
+void
+EventStateManager::ReleaseCurrentIMEContentObserver()
+{
+ if (mIMEContentObserver) {
+ mIMEContentObserver->DisconnectFromEventStateManager();
+ }
+ mIMEContentObserver = nullptr;
+}
+
+void
+EventStateManager::OnStartToObserveContent(
+ IMEContentObserver* aIMEContentObserver)
+{
+ if (mIMEContentObserver == aIMEContentObserver) {
+ return;
+ }
+ ReleaseCurrentIMEContentObserver();
+ mIMEContentObserver = aIMEContentObserver;
+}
+
+void
+EventStateManager::OnStopObservingContent(
+ IMEContentObserver* aIMEContentObserver)
+{
+ aIMEContentObserver->DisconnectFromEventStateManager();
+ NS_ENSURE_TRUE_VOID(mIMEContentObserver == aIMEContentObserver);
+ mIMEContentObserver = nullptr;
+}
+
+void
+EventStateManager::TryToFlushPendingNotificationsToIME()
+{
+ if (mIMEContentObserver) {
+ mIMEContentObserver->TryToFlushPendingNotifications();
+ }
+}
+
+static bool
+IsMessageMouseUserActivity(EventMessage aMessage)
+{
+ return aMessage == eMouseMove ||
+ aMessage == eMouseUp ||
+ aMessage == eMouseDown ||
+ aMessage == eMouseDoubleClick ||
+ aMessage == eMouseClick ||
+ aMessage == eMouseActivate ||
+ aMessage == eMouseLongTap;
+}
+
+static bool
+IsMessageGamepadUserActivity(EventMessage aMessage)
+{
+#ifndef MOZ_GAMEPAD
+ return false;
+#else
+ return aMessage == eGamepadButtonDown ||
+ aMessage == eGamepadButtonUp ||
+ aMessage == eGamepadAxisMove;
+#endif
+}
+
+nsresult
+EventStateManager::PreHandleEvent(nsPresContext* aPresContext,
+ WidgetEvent* aEvent,
+ nsIFrame* aTargetFrame,
+ nsIContent* aTargetContent,
+ nsEventStatus* aStatus)
+{
+ NS_ENSURE_ARG_POINTER(aStatus);
+ NS_ENSURE_ARG(aPresContext);
+ if (!aEvent) {
+ NS_ERROR("aEvent is null. This should never happen.");
+ return NS_ERROR_NULL_POINTER;
+ }
+
+ NS_WARNING_ASSERTION(
+ !aTargetFrame || !aTargetFrame->GetContent() ||
+ aTargetFrame->GetContent() == aTargetContent ||
+ aTargetFrame->GetContent()->GetFlattenedTreeParent() == aTargetContent ||
+ aTargetFrame->IsGeneratedContentFrame(),
+ "aTargetFrame should be related with aTargetContent");
+#if DEBUG
+ if (aTargetFrame && aTargetFrame->IsGeneratedContentFrame()) {
+ nsCOMPtr<nsIContent> targetContent;
+ aTargetFrame->GetContentForEvent(aEvent, getter_AddRefs(targetContent));
+ MOZ_ASSERT(aTargetContent == targetContent,
+ "Unexpected target for generated content frame!");
+ }
+#endif
+
+ mCurrentTarget = aTargetFrame;
+ mCurrentTargetContent = nullptr;
+
+ // Do not take account eMouseEnterIntoWidget/ExitFromWidget so that loading
+ // a page when user is not active doesn't change the state to active.
+ WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent();
+ if (aEvent->IsTrusted() &&
+ ((mouseEvent && mouseEvent->IsReal() &&
+ IsMessageMouseUserActivity(mouseEvent->mMessage)) ||
+ aEvent->mClass == eWheelEventClass ||
+ aEvent->mClass == ePointerEventClass ||
+ aEvent->mClass == eTouchEventClass ||
+ aEvent->mClass == eKeyboardEventClass ||
+ IsMessageGamepadUserActivity(aEvent->mMessage))) {
+ if (gMouseOrKeyboardEventCounter == 0) {
+ nsCOMPtr<nsIObserverService> obs =
+ mozilla::services::GetObserverService();
+ if (obs) {
+ obs->NotifyObservers(nullptr, "user-interaction-active", nullptr);
+ UpdateUserActivityTimer();
+ }
+ }
+ ++gMouseOrKeyboardEventCounter;
+
+ nsCOMPtr<nsINode> node = do_QueryInterface(aTargetContent);
+ if (node &&
+ (aEvent->mMessage == eKeyUp || aEvent->mMessage == eMouseUp ||
+ aEvent->mMessage == eWheel || aEvent->mMessage == eTouchEnd ||
+ aEvent->mMessage == ePointerUp)) {
+ nsIDocument* doc = node->OwnerDoc();
+ while (doc && !doc->UserHasInteracted()) {
+ doc->SetUserHasInteracted(true);
+ doc = nsContentUtils::IsChildOfSameType(doc) ?
+ doc->GetParentDocument() : nullptr;
+ }
+ }
+ }
+
+ WheelTransaction::OnEvent(aEvent);
+
+ // Focus events don't necessarily need a frame.
+ if (!mCurrentTarget && !aTargetContent) {
+ NS_ERROR("mCurrentTarget and aTargetContent are null");
+ return NS_ERROR_NULL_POINTER;
+ }
+#ifdef DEBUG
+ if (aEvent->HasDragEventMessage() && sIsPointerLocked) {
+ NS_ASSERTION(sIsPointerLocked,
+ "sIsPointerLocked is true. Drag events should be suppressed when "
+ "the pointer is locked.");
+ }
+#endif
+ // Store last known screenPoint and clientPoint so pointer lock
+ // can use these values as constants.
+ if (aEvent->IsTrusted() &&
+ ((mouseEvent && mouseEvent->IsReal()) ||
+ aEvent->mClass == eWheelEventClass) &&
+ !sIsPointerLocked) {
+ sLastScreenPoint =
+ Event::GetScreenCoords(aPresContext, aEvent, aEvent->mRefPoint);
+ sLastClientPoint =
+ Event::GetClientCoords(aPresContext, aEvent, aEvent->mRefPoint,
+ CSSIntPoint(0, 0));
+ }
+
+ *aStatus = nsEventStatus_eIgnore;
+
+ if (aEvent->mClass == eQueryContentEventClass) {
+ HandleQueryContentEvent(aEvent->AsQueryContentEvent());
+ return NS_OK;
+ }
+
+ WidgetTouchEvent* touchEvent = aEvent->AsTouchEvent();
+ if (touchEvent && mInTouchDrag) {
+ if (touchEvent->mMessage == eTouchMove) {
+ GenerateDragGesture(aPresContext, touchEvent);
+ } else {
+ mInTouchDrag = false;
+ StopTrackingDragGesture();
+ }
+ }
+
+ switch (aEvent->mMessage) {
+ case eContextMenu:
+ if (sIsPointerLocked) {
+ return NS_ERROR_DOM_INVALID_STATE_ERR;
+ }
+ break;
+ case eMouseTouchDrag:
+ mInTouchDrag = true;
+ BeginTrackingDragGesture(aPresContext, mouseEvent, aTargetFrame);
+ break;
+ case eMouseDown: {
+ switch (mouseEvent->button) {
+ case WidgetMouseEvent::eLeftButton:
+ BeginTrackingDragGesture(aPresContext, mouseEvent, aTargetFrame);
+ mLClickCount = mouseEvent->mClickCount;
+ SetClickCount(mouseEvent, aStatus);
+ sNormalLMouseEventInProcess = true;
+ break;
+ case WidgetMouseEvent::eMiddleButton:
+ mMClickCount = mouseEvent->mClickCount;
+ SetClickCount(mouseEvent, aStatus);
+ break;
+ case WidgetMouseEvent::eRightButton:
+ mRClickCount = mouseEvent->mClickCount;
+ SetClickCount(mouseEvent, aStatus);
+ break;
+ }
+ break;
+ }
+ case eMouseUp: {
+ switch (mouseEvent->button) {
+ case WidgetMouseEvent::eLeftButton:
+ if (Prefs::ClickHoldContextMenu()) {
+ KillClickHoldTimer();
+ }
+ StopTrackingDragGesture();
+ sNormalLMouseEventInProcess = false;
+ // then fall through...
+ MOZ_FALLTHROUGH;
+ case WidgetMouseEvent::eRightButton:
+ case WidgetMouseEvent::eMiddleButton:
+ SetClickCount(mouseEvent, aStatus);
+ break;
+ }
+ break;
+ }
+ case eMouseEnterIntoWidget:
+ // In some cases on e10s eMouseEnterIntoWidget
+ // event was sent twice into child process of content.
+ // (From specific widget code (sending is not permanent) and
+ // from ESM::DispatchMouseOrPointerEvent (sending is permanent)).
+ // Flag mNoCrossProcessBoundaryForwarding helps to
+ // suppress sending accidental event from widget code.
+ aEvent->StopCrossProcessForwarding();
+ break;
+ case eMouseExitFromWidget:
+ // If this is a remote frame, we receive eMouseExitFromWidget from the
+ // parent the mouse exits our content. Since the parent may update the
+ // cursor while the mouse is outside our frame, and since PuppetWidget
+ // caches the current cursor internally, re-entering our content (say from
+ // over a window edge) wont update the cursor if the cached value and the
+ // current cursor match. So when the mouse exits a remote frame, clear the
+ // cached widget cursor so a proper update will occur when the mouse
+ // re-enters.
+ if (XRE_IsContentProcess()) {
+ ClearCachedWidgetCursor(mCurrentTarget);
+ }
+
+ // Flag helps to suppress double event sending into process of content.
+ // For more information see comment above, at eMouseEnterIntoWidget case.
+ aEvent->StopCrossProcessForwarding();
+
+ // If the event is not a top-level window exit, then it's not
+ // really an exit --- we may have traversed widget boundaries but
+ // we're still in our toplevel window.
+ if (mouseEvent->mExitFrom != WidgetMouseEvent::eTopLevel) {
+ // Treat it as a synthetic move so we don't generate spurious
+ // "exit" or "move" events. Any necessary "out" or "over" events
+ // will be generated by GenerateMouseEnterExit
+ mouseEvent->mMessage = eMouseMove;
+ mouseEvent->mReason = WidgetMouseEvent::eSynthesized;
+ // then fall through...
+ } else {
+ if (sPointerEventEnabled) {
+ // We should synthetize corresponding pointer events
+ GeneratePointerEnterExit(ePointerLeave, mouseEvent);
+ }
+ GenerateMouseEnterExit(mouseEvent);
+ //This is a window level mouse exit event and should stop here
+ aEvent->mMessage = eVoidEvent;
+ break;
+ }
+ MOZ_FALLTHROUGH;
+ case eMouseMove:
+ case ePointerDown:
+ case ePointerMove: {
+ // on the Mac, GenerateDragGesture() may not return until the drag
+ // has completed and so |aTargetFrame| may have been deleted (moving
+ // a bookmark, for example). If this is the case, however, we know
+ // that ClearFrameRefs() has been called and it cleared out
+ // |mCurrentTarget|. As a result, we should pass |mCurrentTarget|
+ // into UpdateCursor().
+ GenerateDragGesture(aPresContext, mouseEvent);
+ UpdateCursor(aPresContext, aEvent, mCurrentTarget, aStatus);
+ GenerateMouseEnterExit(mouseEvent);
+ // Flush pending layout changes, so that later mouse move events
+ // will go to the right nodes.
+ FlushPendingEvents(aPresContext);
+ break;
+ }
+ case eDragStart:
+ if (Prefs::ClickHoldContextMenu()) {
+ // an external drag gesture event came in, not generated internally
+ // by Gecko. Make sure we get rid of the click-hold timer.
+ KillClickHoldTimer();
+ }
+ break;
+ case eDragOver:
+ // Send the enter/exit events before eDrop.
+ GenerateDragDropEnterExit(aPresContext, aEvent->AsDragEvent());
+ break;
+
+ case eKeyPress:
+ {
+ WidgetKeyboardEvent* keyEvent = aEvent->AsKeyboardEvent();
+
+ int32_t modifierMask = 0;
+ if (keyEvent->IsShift())
+ modifierMask |= NS_MODIFIER_SHIFT;
+ if (keyEvent->IsControl())
+ modifierMask |= NS_MODIFIER_CONTROL;
+ if (keyEvent->IsAlt())
+ modifierMask |= NS_MODIFIER_ALT;
+ if (keyEvent->IsMeta())
+ modifierMask |= NS_MODIFIER_META;
+ if (keyEvent->IsOS())
+ modifierMask |= NS_MODIFIER_OS;
+
+ // Prevent keyboard scrolling while an accesskey modifier is in use.
+ if (modifierMask) {
+ bool matchesContentAccessKey = (modifierMask == Prefs::ContentAccessModifierMask());
+
+ if (modifierMask == Prefs::ChromeAccessModifierMask() ||
+ matchesContentAccessKey) {
+ AutoTArray<uint32_t, 10> accessCharCodes;
+ keyEvent->GetAccessKeyCandidates(accessCharCodes);
+
+ if (HandleAccessKey(keyEvent, aPresContext, accessCharCodes,
+ modifierMask, matchesContentAccessKey)) {
+ *aStatus = nsEventStatus_eConsumeNoDefault;
+ }
+ }
+ }
+ }
+ // then fall through...
+ MOZ_FALLTHROUGH;
+ case eBeforeKeyDown:
+ case eKeyDown:
+ case eAfterKeyDown:
+ case eBeforeKeyUp:
+ case eKeyUp:
+ case eAfterKeyUp:
+ {
+ nsIContent* content = GetFocusedContent();
+ if (content)
+ mCurrentTargetContent = content;
+
+ // NOTE: Don't refer TextComposition::IsComposing() since UI Events
+ // defines that KeyboardEvent.isComposing is true when it's
+ // dispatched after compositionstart and compositionend.
+ // TextComposition::IsComposing() is false even before
+ // compositionend if there is no composing string.
+ // And also don't expose other document's composition state.
+ // A native IME context is typically shared by multiple documents.
+ // So, don't use GetTextCompositionFor(nsIWidget*) here.
+ RefPtr<TextComposition> composition =
+ IMEStateManager::GetTextCompositionFor(aPresContext);
+ aEvent->AsKeyboardEvent()->mIsComposing = !!composition;
+ }
+ break;
+ case eWheel:
+ case eWheelOperationStart:
+ case eWheelOperationEnd:
+ {
+ NS_ASSERTION(aEvent->IsTrusted(),
+ "Untrusted wheel event shouldn't be here");
+
+ nsIContent* content = GetFocusedContent();
+ if (content) {
+ mCurrentTargetContent = content;
+ }
+
+ if (aEvent->mMessage != eWheel) {
+ break;
+ }
+
+ WidgetWheelEvent* wheelEvent = aEvent->AsWheelEvent();
+ WheelPrefs::GetInstance()->ApplyUserPrefsToDelta(wheelEvent);
+
+ // If we won't dispatch a DOM event for this event, nothing to do anymore.
+ if (!wheelEvent->IsAllowedToDispatchDOMEvent()) {
+ break;
+ }
+
+ // Init lineOrPageDelta values for line scroll events for some devices
+ // on some platforms which might dispatch wheel events which don't have
+ // lineOrPageDelta values. And also, if delta values are customized by
+ // prefs, this recomputes them.
+ DeltaAccumulator::GetInstance()->
+ InitLineOrPageDelta(aTargetFrame, this, wheelEvent);
+ }
+ break;
+ case eSetSelection:
+ IMEStateManager::HandleSelectionEvent(aPresContext, GetFocusedContent(),
+ aEvent->AsSelectionEvent());
+ break;
+ case eContentCommandCut:
+ case eContentCommandCopy:
+ case eContentCommandPaste:
+ case eContentCommandDelete:
+ case eContentCommandUndo:
+ case eContentCommandRedo:
+ case eContentCommandPasteTransferable:
+ case eContentCommandLookUpDictionary:
+ DoContentCommandEvent(aEvent->AsContentCommandEvent());
+ break;
+ case eContentCommandScroll:
+ DoContentCommandScrollEvent(aEvent->AsContentCommandEvent());
+ break;
+ case eCompositionStart:
+ if (aEvent->IsTrusted()) {
+ // If the event is trusted event, set the selected text to data of
+ // composition event.
+ WidgetCompositionEvent* compositionEvent = aEvent->AsCompositionEvent();
+ WidgetQueryContentEvent selectedText(true, eQuerySelectedText,
+ compositionEvent->mWidget);
+ HandleQueryContentEvent(&selectedText);
+ NS_ASSERTION(selectedText.mSucceeded, "Failed to get selected text");
+ compositionEvent->mData = selectedText.mReply.mString;
+ }
+ break;
+ default:
+ break;
+ }
+ return NS_OK;
+}
+
+void
+EventStateManager::HandleQueryContentEvent(WidgetQueryContentEvent* aEvent)
+{
+ switch (aEvent->mMessage) {
+ case eQuerySelectedText:
+ case eQueryTextContent:
+ case eQueryCaretRect:
+ case eQueryTextRect:
+ case eQueryEditorRect:
+ if (!IsTargetCrossProcess(aEvent)) {
+ break;
+ }
+ // Will not be handled locally, remote the event
+ GetCrossProcessTarget()->HandleQueryContentEvent(*aEvent);
+ return;
+ // Following events have not been supported in e10s mode yet.
+ case eQueryContentState:
+ case eQuerySelectionAsTransferable:
+ case eQueryCharacterAtPoint:
+ case eQueryDOMWidgetHittest:
+ case eQueryTextRectArray:
+ break;
+ default:
+ return;
+ }
+
+ // If there is an IMEContentObserver, we need to handle QueryContentEvent
+ // with it.
+ if (mIMEContentObserver) {
+ RefPtr<IMEContentObserver> contentObserver = mIMEContentObserver;
+ contentObserver->HandleQueryContentEvent(aEvent);
+ return;
+ }
+
+ ContentEventHandler handler(mPresContext);
+ handler.HandleQueryContentEvent(aEvent);
+}
+
+// static
+int32_t
+EventStateManager::GetAccessModifierMaskFor(nsISupports* aDocShell)
+{
+ nsCOMPtr<nsIDocShellTreeItem> treeItem(do_QueryInterface(aDocShell));
+ if (!treeItem)
+ return -1; // invalid modifier
+
+ switch (treeItem->ItemType()) {
+ case nsIDocShellTreeItem::typeChrome:
+ return Prefs::ChromeAccessModifierMask();
+
+ case nsIDocShellTreeItem::typeContent:
+ return Prefs::ContentAccessModifierMask();
+
+ default:
+ return -1; // invalid modifier
+ }
+}
+
+static bool
+IsAccessKeyTarget(nsIContent* aContent, nsIFrame* aFrame, nsAString& aKey)
+{
+ // Use GetAttr because we want Unicode case=insensitive matching
+ // XXXbz shouldn't this be case-sensitive, per spec?
+ nsString contentKey;
+ if (!aContent->GetAttr(kNameSpaceID_None, nsGkAtoms::accesskey, contentKey) ||
+ !contentKey.Equals(aKey, nsCaseInsensitiveStringComparator()))
+ return false;
+
+ nsCOMPtr<nsIDOMXULDocument> xulDoc =
+ do_QueryInterface(aContent->OwnerDoc());
+ if (!xulDoc && !aContent->IsXULElement())
+ return true;
+
+ // For XUL we do visibility checks.
+ if (!aFrame)
+ return false;
+
+ if (aFrame->IsFocusable())
+ return true;
+
+ if (!aFrame->IsVisibleConsideringAncestors())
+ return false;
+
+ // XUL controls can be activated.
+ nsCOMPtr<nsIDOMXULControlElement> control(do_QueryInterface(aContent));
+ if (control)
+ return true;
+
+ // HTML area, label and legend elements are never focusable, so
+ // we need to check for them explicitly before giving up.
+ if (aContent->IsAnyOfHTMLElements(nsGkAtoms::area,
+ nsGkAtoms::label,
+ nsGkAtoms::legend)) {
+ return true;
+ }
+
+ // XUL label elements are never focusable, so we need to check for them
+ // explicitly before giving up.
+ if (aContent->IsXULElement(nsGkAtoms::label)) {
+ return true;
+ }
+
+ return false;
+}
+
+bool
+EventStateManager::ExecuteAccessKey(nsTArray<uint32_t>& aAccessCharCodes,
+ bool aIsTrustedEvent)
+{
+ int32_t count, start = -1;
+ nsIContent* focusedContent = GetFocusedContent();
+ if (focusedContent) {
+ start = mAccessKeys.IndexOf(focusedContent);
+ if (start == -1 && focusedContent->GetBindingParent())
+ start = mAccessKeys.IndexOf(focusedContent->GetBindingParent());
+ }
+ nsIContent *content;
+ nsIFrame *frame;
+ int32_t length = mAccessKeys.Count();
+ for (uint32_t i = 0; i < aAccessCharCodes.Length(); ++i) {
+ uint32_t ch = aAccessCharCodes[i];
+ nsAutoString accessKey;
+ AppendUCS4ToUTF16(ch, accessKey);
+ for (count = 1; count <= length; ++count) {
+ content = mAccessKeys[(start + count) % length];
+ frame = content->GetPrimaryFrame();
+ if (IsAccessKeyTarget(content, frame, accessKey)) {
+ bool shouldActivate = Prefs::KeyCausesActivation();
+ while (shouldActivate && ++count <= length) {
+ nsIContent *oc = mAccessKeys[(start + count) % length];
+ nsIFrame *of = oc->GetPrimaryFrame();
+ if (IsAccessKeyTarget(oc, of, accessKey))
+ shouldActivate = false;
+ }
+
+ bool focusChanged = false;
+ if (shouldActivate) {
+ focusChanged = content->PerformAccesskey(shouldActivate, aIsTrustedEvent);
+ } else {
+ nsIFocusManager* fm = nsFocusManager::GetFocusManager();
+ if (fm) {
+ nsCOMPtr<nsIDOMElement> element = do_QueryInterface(content);
+ fm->SetFocus(element, nsIFocusManager::FLAG_BYKEY);
+ focusChanged = true;
+ }
+ }
+
+ if (focusChanged && aIsTrustedEvent) {
+ // If this is a child process, inform the parent that we want the focus, but
+ // pass false since we don't want to change the window order.
+ nsIDocShell* docShell = mPresContext->GetDocShell();
+ nsCOMPtr<nsITabChild> child =
+ docShell ? docShell->GetTabChild() : nullptr;
+ if (child) {
+ child->SendRequestFocus(false);
+ }
+ }
+
+ return true;
+ }
+ }
+ }
+ return false;
+}
+
+// static
+void
+EventStateManager::GetAccessKeyLabelPrefix(Element* aElement, nsAString& aPrefix)
+{
+ aPrefix.Truncate();
+ nsAutoString separator, modifierText;
+ nsContentUtils::GetModifierSeparatorText(separator);
+
+ nsCOMPtr<nsISupports> container = aElement->OwnerDoc()->GetDocShell();
+ int32_t modifierMask = GetAccessModifierMaskFor(container);
+
+ if (modifierMask == -1) {
+ return;
+ }
+
+ if (modifierMask & NS_MODIFIER_CONTROL) {
+ nsContentUtils::GetControlText(modifierText);
+ aPrefix.Append(modifierText + separator);
+ }
+ if (modifierMask & NS_MODIFIER_META) {
+ nsContentUtils::GetMetaText(modifierText);
+ aPrefix.Append(modifierText + separator);
+ }
+ if (modifierMask & NS_MODIFIER_OS) {
+ nsContentUtils::GetOSText(modifierText);
+ aPrefix.Append(modifierText + separator);
+ }
+ if (modifierMask & NS_MODIFIER_ALT) {
+ nsContentUtils::GetAltText(modifierText);
+ aPrefix.Append(modifierText + separator);
+ }
+ if (modifierMask & NS_MODIFIER_SHIFT) {
+ nsContentUtils::GetShiftText(modifierText);
+ aPrefix.Append(modifierText + separator);
+ }
+}
+
+struct MOZ_STACK_CLASS AccessKeyInfo
+{
+ WidgetKeyboardEvent* event;
+ nsTArray<uint32_t>& charCodes;
+ int32_t modifierMask;
+
+ AccessKeyInfo(WidgetKeyboardEvent* aEvent, nsTArray<uint32_t>& aCharCodes, int32_t aModifierMask)
+ : event(aEvent)
+ , charCodes(aCharCodes)
+ , modifierMask(aModifierMask)
+ {
+ }
+};
+
+static bool
+HandleAccessKeyInRemoteChild(TabParent* aTabParent, void* aArg)
+{
+ AccessKeyInfo* accessKeyInfo = static_cast<AccessKeyInfo*>(aArg);
+
+ // Only forward accesskeys for the active tab.
+ bool active;
+ aTabParent->GetDocShellIsActive(&active);
+ if (active) {
+ accessKeyInfo->event->mAccessKeyForwardedToChild = true;
+ aTabParent->HandleAccessKey(*accessKeyInfo->event,
+ accessKeyInfo->charCodes,
+ accessKeyInfo->modifierMask);
+ return true;
+ }
+
+ return false;
+}
+
+bool
+EventStateManager::HandleAccessKey(WidgetKeyboardEvent* aEvent,
+ nsPresContext* aPresContext,
+ nsTArray<uint32_t>& aAccessCharCodes,
+ bool aMatchesContentAccessKey,
+ nsIDocShellTreeItem* aBubbledFrom,
+ ProcessingAccessKeyState aAccessKeyState,
+ int32_t aModifierMask)
+{
+ EnsureDocument(mPresContext);
+ nsCOMPtr<nsIDocShell> docShell = aPresContext->GetDocShell();
+ if (NS_WARN_IF(!docShell) || NS_WARN_IF(!mDocument)) {
+ return false;
+ }
+
+ // Alt or other accesskey modifier is down, we may need to do an accesskey.
+ if (mAccessKeys.Count() > 0 &&
+ aModifierMask == GetAccessModifierMaskFor(docShell)) {
+ // Someone registered an accesskey. Find and activate it.
+ if (ExecuteAccessKey(aAccessCharCodes, aEvent->IsTrusted())) {
+ return true;
+ }
+ }
+
+ int32_t childCount;
+ docShell->GetChildCount(&childCount);
+ for (int32_t counter = 0; counter < childCount; counter++) {
+ // Not processing the child which bubbles up the handling
+ nsCOMPtr<nsIDocShellTreeItem> subShellItem;
+ docShell->GetChildAt(counter, getter_AddRefs(subShellItem));
+ if (aAccessKeyState == eAccessKeyProcessingUp &&
+ subShellItem == aBubbledFrom) {
+ continue;
+ }
+
+ nsCOMPtr<nsIDocShell> subDS = do_QueryInterface(subShellItem);
+ if (subDS && IsShellVisible(subDS)) {
+ nsCOMPtr<nsIPresShell> subPS = subDS->GetPresShell();
+
+ // Docshells need not have a presshell (eg. display:none
+ // iframes, docshells in transition between documents, etc).
+ if (!subPS) {
+ // Oh, well. Just move on to the next child
+ continue;
+ }
+
+ nsPresContext *subPC = subPS->GetPresContext();
+
+ EventStateManager* esm =
+ static_cast<EventStateManager*>(subPC->EventStateManager());
+
+ if (esm &&
+ esm->HandleAccessKey(aEvent, subPC, aAccessCharCodes,
+ aMatchesContentAccessKey, nullptr,
+ eAccessKeyProcessingDown, aModifierMask)) {
+ return true;
+ }
+ }
+ }// if end . checking all sub docshell ends here.
+
+ // bubble up the process to the parent docshell if necessary
+ if (eAccessKeyProcessingDown != aAccessKeyState) {
+ nsCOMPtr<nsIDocShellTreeItem> parentShellItem;
+ docShell->GetParent(getter_AddRefs(parentShellItem));
+ nsCOMPtr<nsIDocShell> parentDS = do_QueryInterface(parentShellItem);
+ if (parentDS) {
+ nsCOMPtr<nsIPresShell> parentPS = parentDS->GetPresShell();
+ NS_ASSERTION(parentPS, "Our PresShell exists but the parent's does not?");
+
+ nsPresContext *parentPC = parentPS->GetPresContext();
+ NS_ASSERTION(parentPC, "PresShell without PresContext");
+
+ EventStateManager* esm =
+ static_cast<EventStateManager*>(parentPC->EventStateManager());
+ if (esm &&
+ esm->HandleAccessKey(aEvent, parentPC, aAccessCharCodes,
+ aMatchesContentAccessKey, docShell,
+ eAccessKeyProcessingDown, aModifierMask)) {
+ return true;
+ }
+ }
+ }// if end. bubble up process
+
+ // If the content access key modifier is pressed, try remote children
+ if (aMatchesContentAccessKey && mDocument && mDocument->GetWindow()) {
+ // If the focus is currently on a node with a TabParent, the key event will
+ // get forwarded to the child process and HandleAccessKey called from there.
+ // If focus is somewhere else, then we need to check the remote children.
+ nsFocusManager* fm = nsFocusManager::GetFocusManager();
+ nsIContent* focusedContent = fm ? fm->GetFocusedContent() : nullptr;
+ if (TabParent::GetFrom(focusedContent)) {
+ // A remote child process is focused. The key event should get sent to
+ // the child process.
+ aEvent->mAccessKeyForwardedToChild = true;
+ } else {
+ AccessKeyInfo accessKeyInfo(aEvent, aAccessCharCodes, aModifierMask);
+ nsContentUtils::CallOnAllRemoteChildren(mDocument->GetWindow(),
+ HandleAccessKeyInRemoteChild, &accessKeyInfo);
+ }
+ }
+
+ return false;
+}// end of HandleAccessKey
+
+bool
+EventStateManager::DispatchCrossProcessEvent(WidgetEvent* aEvent,
+ nsFrameLoader* aFrameLoader,
+ nsEventStatus *aStatus) {
+ TabParent* remote = TabParent::GetFrom(aFrameLoader);
+ if (!remote) {
+ return false;
+ }
+
+ switch (aEvent->mClass) {
+ case eMouseEventClass: {
+ return remote->SendRealMouseEvent(*aEvent->AsMouseEvent());
+ }
+ case eKeyboardEventClass: {
+ return remote->SendRealKeyEvent(*aEvent->AsKeyboardEvent());
+ }
+ case eWheelEventClass: {
+ return remote->SendMouseWheelEvent(*aEvent->AsWheelEvent());
+ }
+ case eTouchEventClass: {
+ // Let the child process synthesize a mouse event if needed, and
+ // ensure we don't synthesize one in this process.
+ *aStatus = nsEventStatus_eConsumeNoDefault;
+ return remote->SendRealTouchEvent(*aEvent->AsTouchEvent());
+ }
+ case eDragEventClass: {
+ RefPtr<TabParent> tabParent = remote;
+ if (tabParent->Manager()->IsContentParent()) {
+ tabParent->Manager()->AsContentParent()->MaybeInvokeDragSession(tabParent);
+ }
+
+ nsCOMPtr<nsIDragSession> dragSession = nsContentUtils::GetDragSession();
+ uint32_t dropEffect = nsIDragService::DRAGDROP_ACTION_NONE;
+ uint32_t action = nsIDragService::DRAGDROP_ACTION_NONE;
+ if (dragSession) {
+ dragSession->DragEventDispatchedToChildProcess();
+ dragSession->GetDragAction(&action);
+ nsCOMPtr<nsIDOMDataTransfer> initialDataTransfer;
+ dragSession->GetDataTransfer(getter_AddRefs(initialDataTransfer));
+ if (initialDataTransfer) {
+ initialDataTransfer->GetDropEffectInt(&dropEffect);
+ }
+ }
+
+ bool retval = tabParent->SendRealDragEvent(*aEvent->AsDragEvent(),
+ action, dropEffect);
+
+ return retval;
+ }
+ case ePluginEventClass: {
+ *aStatus = nsEventStatus_eConsumeNoDefault;
+ return remote->SendPluginEvent(*aEvent->AsPluginEvent());
+ }
+ default: {
+ MOZ_CRASH("Attempt to send non-whitelisted event?");
+ }
+ }
+}
+
+bool
+EventStateManager::IsRemoteTarget(nsIContent* target) {
+ if (!target) {
+ return false;
+ }
+
+ // <browser/iframe remote=true> from XUL
+ if (target->IsAnyOfXULElements(nsGkAtoms::browser, nsGkAtoms::iframe) &&
+ target->AttrValueIs(kNameSpaceID_None, nsGkAtoms::Remote,
+ nsGkAtoms::_true, eIgnoreCase)) {
+ return true;
+ }
+
+ // <frame/iframe mozbrowser/mozapp>
+ nsCOMPtr<nsIMozBrowserFrame> browserFrame = do_QueryInterface(target);
+ if (browserFrame && browserFrame->GetReallyIsBrowserOrApp()) {
+ return !!TabParent::GetFrom(target);
+ }
+
+ return false;
+}
+
+static bool
+CrossProcessSafeEvent(const WidgetEvent& aEvent)
+{
+ switch (aEvent.mClass) {
+ case eKeyboardEventClass:
+ case eWheelEventClass:
+ return true;
+ case eMouseEventClass:
+ switch (aEvent.mMessage) {
+ case eMouseDown:
+ case eMouseUp:
+ case eMouseMove:
+ case eContextMenu:
+ case eMouseEnterIntoWidget:
+ case eMouseExitFromWidget:
+ case eMouseTouchDrag:
+ return true;
+ default:
+ return false;
+ }
+ case eTouchEventClass:
+ switch (aEvent.mMessage) {
+ case eTouchStart:
+ case eTouchMove:
+ case eTouchEnd:
+ case eTouchCancel:
+ return true;
+ default:
+ return false;
+ }
+ case eDragEventClass:
+ switch (aEvent.mMessage) {
+ case eDragOver:
+ case eDragExit:
+ case eDrop:
+ return true;
+ default:
+ return false;
+ }
+ default:
+ return false;
+ }
+}
+
+bool
+EventStateManager::HandleCrossProcessEvent(WidgetEvent* aEvent,
+ nsEventStatus *aStatus) {
+ if (*aStatus == nsEventStatus_eConsumeNoDefault ||
+ aEvent->mFlags.mNoCrossProcessBoundaryForwarding ||
+ !CrossProcessSafeEvent(*aEvent)) {
+ return false;
+ }
+
+ // Collect the remote event targets we're going to forward this
+ // event to.
+ //
+ // NB: the elements of |targets| must be unique, for correctness.
+ AutoTArray<nsCOMPtr<nsIContent>, 1> targets;
+ if (aEvent->mClass != eTouchEventClass || aEvent->mMessage == eTouchStart) {
+ // If this event only has one target, and it's remote, add it to
+ // the array.
+ nsIFrame* frame =
+ aEvent->mMessage == eDragExit ? sLastDragOverFrame.GetFrame() : GetEventTarget();
+ nsIContent* target = frame ? frame->GetContent() : nullptr;
+ if (IsRemoteTarget(target)) {
+ targets.AppendElement(target);
+ }
+ } else {
+ // This is a touch event with possibly multiple touch points.
+ // Each touch point may have its own target. So iterate through
+ // all of them and collect the unique set of targets for event
+ // forwarding.
+ //
+ // This loop is similar to the one used in
+ // PresShell::DispatchTouchEvent().
+ const WidgetTouchEvent::TouchArray& touches =
+ aEvent->AsTouchEvent()->mTouches;
+ for (uint32_t i = 0; i < touches.Length(); ++i) {
+ Touch* touch = touches[i];
+ // NB: the |mChanged| check is an optimization, subprocesses can
+ // compute this for themselves. If the touch hasn't changed, we
+ // may be able to avoid forwarding the event entirely (which is
+ // not free).
+ if (!touch || !touch->mChanged) {
+ continue;
+ }
+ nsCOMPtr<EventTarget> targetPtr = touch->mTarget;
+ if (!targetPtr) {
+ continue;
+ }
+ nsCOMPtr<nsIContent> target = do_QueryInterface(targetPtr);
+ if (IsRemoteTarget(target) && !targets.Contains(target)) {
+ targets.AppendElement(target);
+ }
+ }
+ }
+
+ if (targets.Length() == 0) {
+ return false;
+ }
+
+ // Look up the frame loader for all the remote targets we found, and
+ // then dispatch the event to the remote content they represent.
+ bool dispatched = false;
+ for (uint32_t i = 0; i < targets.Length(); ++i) {
+ nsIContent* target = targets[i];
+ nsCOMPtr<nsIFrameLoaderOwner> loaderOwner = do_QueryInterface(target);
+ if (!loaderOwner) {
+ continue;
+ }
+
+ RefPtr<nsFrameLoader> frameLoader = loaderOwner->GetFrameLoader();
+ if (!frameLoader) {
+ continue;
+ }
+
+ uint32_t eventMode;
+ frameLoader->GetEventMode(&eventMode);
+ if (eventMode == nsIFrameLoader::EVENT_MODE_DONT_FORWARD_TO_CHILD) {
+ continue;
+ }
+
+ dispatched |= DispatchCrossProcessEvent(aEvent, frameLoader, aStatus);
+ }
+ return dispatched;
+}
+
+//
+// CreateClickHoldTimer
+//
+// Fire off a timer for determining if the user wants click-hold. This timer
+// is a one-shot that will be cancelled when the user moves enough to fire
+// a drag.
+//
+void
+EventStateManager::CreateClickHoldTimer(nsPresContext* inPresContext,
+ nsIFrame* inDownFrame,
+ WidgetGUIEvent* inMouseDownEvent)
+{
+ if (!inMouseDownEvent->IsTrusted() ||
+ IsRemoteTarget(mGestureDownContent) ||
+ sIsPointerLocked) {
+ return;
+ }
+
+ // just to be anal (er, safe)
+ if (mClickHoldTimer) {
+ mClickHoldTimer->Cancel();
+ mClickHoldTimer = nullptr;
+ }
+
+ // if content clicked on has a popup, don't even start the timer
+ // since we'll end up conflicting and both will show.
+ if (mGestureDownContent) {
+ // check for the |popup| attribute
+ if (nsContentUtils::HasNonEmptyAttr(mGestureDownContent, kNameSpaceID_None,
+ nsGkAtoms::popup))
+ return;
+
+ // check for a <menubutton> like bookmarks
+ if (mGestureDownContent->IsXULElement(nsGkAtoms::menubutton))
+ return;
+ }
+
+ mClickHoldTimer = do_CreateInstance("@mozilla.org/timer;1");
+ if (mClickHoldTimer) {
+ int32_t clickHoldDelay =
+ Preferences::GetInt("ui.click_hold_context_menus.delay", 500);
+ mClickHoldTimer->InitWithFuncCallback(sClickHoldCallback, this,
+ clickHoldDelay,
+ nsITimer::TYPE_ONE_SHOT);
+ }
+} // CreateClickHoldTimer
+
+//
+// KillClickHoldTimer
+//
+// Stop the timer that would show the context menu dead in its tracks
+//
+void
+EventStateManager::KillClickHoldTimer()
+{
+ if (mClickHoldTimer) {
+ mClickHoldTimer->Cancel();
+ mClickHoldTimer = nullptr;
+ }
+}
+
+//
+// sClickHoldCallback
+//
+// This fires after the mouse has been down for a certain length of time.
+//
+void
+EventStateManager::sClickHoldCallback(nsITimer* aTimer, void* aESM)
+{
+ RefPtr<EventStateManager> self = static_cast<EventStateManager*>(aESM);
+ if (self) {
+ self->FireContextClick();
+ }
+
+ // NOTE: |aTimer| and |self->mAutoHideTimer| are invalid after calling ClosePopup();
+
+} // sAutoHideCallback
+
+//
+// FireContextClick
+//
+// If we're this far, our timer has fired, which means the mouse has been down
+// for a certain period of time and has not moved enough to generate a dragGesture.
+// We can be certain the user wants a context-click at this stage, so generate
+// a dom event and fire it in.
+//
+// After the event fires, check if PreventDefault() has been set on the event which
+// means that someone either ate the event or put up a context menu. This is our cue
+// to stop tracking the drag gesture. If we always did this, draggable items w/out
+// a context menu wouldn't be draggable after a certain length of time, which is
+// _not_ what we want.
+//
+void
+EventStateManager::FireContextClick()
+{
+ if (!mGestureDownContent || !mPresContext || sIsPointerLocked) {
+ return;
+ }
+
+#ifdef XP_MACOSX
+ // Hack to ensure that we don't show a context menu when the user
+ // let go of the mouse after a long cpu-hogging operation prevented
+ // us from handling any OS events. See bug 117589.
+ if (!CGEventSourceButtonState(kCGEventSourceStateCombinedSessionState, kCGMouseButtonLeft))
+ return;
+#endif
+
+ nsEventStatus status = nsEventStatus_eIgnore;
+
+ // Dispatch to the DOM. We have to fake out the ESM and tell it that the
+ // current target frame is actually where the mouseDown occurred, otherwise it
+ // will use the frame the mouse is currently over which may or may not be
+ // the same. (Note: saari and I have decided that we don't have to reset |mCurrentTarget|
+ // when we're through because no one else is doing anything more with this
+ // event and it will get reset on the very next event to the correct frame).
+ mCurrentTarget = mPresContext->GetPrimaryFrameFor(mGestureDownContent);
+ // make sure the widget sticks around
+ nsCOMPtr<nsIWidget> targetWidget;
+ if (mCurrentTarget && (targetWidget = mCurrentTarget->GetNearestWidget())) {
+ NS_ASSERTION(mPresContext == mCurrentTarget->PresContext(),
+ "a prescontext returned a primary frame that didn't belong to it?");
+
+ // before dispatching, check that we're not on something that
+ // doesn't get a context menu
+ bool allowedToDispatch = true;
+
+ if (mGestureDownContent->IsAnyOfXULElements(nsGkAtoms::scrollbar,
+ nsGkAtoms::scrollbarbutton,
+ nsGkAtoms::button)) {
+ allowedToDispatch = false;
+ } else if (mGestureDownContent->IsXULElement(nsGkAtoms::toolbarbutton)) {
+ // a <toolbarbutton> that has the container attribute set
+ // will already have its own dropdown.
+ if (nsContentUtils::HasNonEmptyAttr(mGestureDownContent,
+ kNameSpaceID_None, nsGkAtoms::container)) {
+ allowedToDispatch = false;
+ } else {
+ // If the toolbar button has an open menu, don't attempt to open
+ // a second menu
+ if (mGestureDownContent->AttrValueIs(kNameSpaceID_None, nsGkAtoms::open,
+ nsGkAtoms::_true, eCaseMatters)) {
+ allowedToDispatch = false;
+ }
+ }
+ }
+ else if (mGestureDownContent->IsHTMLElement()) {
+ nsCOMPtr<nsIFormControl> formCtrl(do_QueryInterface(mGestureDownContent));
+
+ if (formCtrl) {
+ allowedToDispatch = formCtrl->IsTextOrNumberControl(/*aExcludePassword*/ false) ||
+ formCtrl->GetType() == NS_FORM_INPUT_FILE;
+ }
+ else if (mGestureDownContent->IsAnyOfHTMLElements(nsGkAtoms::applet,
+ nsGkAtoms::embed,
+ nsGkAtoms::object,
+ nsGkAtoms::label)) {
+ allowedToDispatch = false;
+ }
+ }
+
+ if (allowedToDispatch) {
+ // init the event while mCurrentTarget is still good
+ WidgetMouseEvent event(true, eContextMenu, targetWidget,
+ WidgetMouseEvent::eReal);
+ event.mClickCount = 1;
+ FillInEventFromGestureDown(&event);
+
+ // stop selection tracking, we're in control now
+ if (mCurrentTarget)
+ {
+ RefPtr<nsFrameSelection> frameSel =
+ mCurrentTarget->GetFrameSelection();
+
+ if (frameSel && frameSel->GetDragState()) {
+ // note that this can cause selection changed events to fire if we're in
+ // a text field, which will null out mCurrentTarget
+ frameSel->SetDragState(false);
+ }
+ }
+
+ nsIDocument* doc = mGestureDownContent->GetComposedDoc();
+ AutoHandlingUserInputStatePusher userInpStatePusher(true, &event, doc);
+
+ // dispatch to DOM
+ EventDispatcher::Dispatch(mGestureDownContent, mPresContext, &event,
+ nullptr, &status);
+
+ // We don't need to dispatch to frame handling because no frames
+ // watch eContextMenu except for nsMenuFrame and that's only for
+ // dismissal. That's just as well since we don't really know
+ // which frame to send it to.
+ }
+ }
+
+ // now check if the event has been handled. If so, stop tracking a drag
+ if (status == nsEventStatus_eConsumeNoDefault) {
+ StopTrackingDragGesture();
+ }
+
+ KillClickHoldTimer();
+
+} // FireContextClick
+
+//
+// BeginTrackingDragGesture
+//
+// Record that the mouse has gone down and that we should move to TRACKING state
+// of d&d gesture tracker.
+//
+// We also use this to track click-hold context menus. When the mouse goes down,
+// fire off a short timer. If the timer goes off and we have yet to fire the
+// drag gesture (ie, the mouse hasn't moved a certain distance), then we can
+// assume the user wants a click-hold, so fire a context-click event. We only
+// want to cancel the drag gesture if the context-click event is handled.
+//
+void
+EventStateManager::BeginTrackingDragGesture(nsPresContext* aPresContext,
+ WidgetMouseEvent* inDownEvent,
+ nsIFrame* inDownFrame)
+{
+ if (!inDownEvent->mWidget) {
+ return;
+ }
+
+ // Note that |inDownEvent| could be either a mouse down event or a
+ // synthesized mouse move event.
+ mGestureDownPoint =
+ inDownEvent->mRefPoint + inDownEvent->mWidget->WidgetToScreenOffset();
+
+ if (inDownFrame) {
+ inDownFrame->GetContentForEvent(inDownEvent,
+ getter_AddRefs(mGestureDownContent));
+
+ mGestureDownFrameOwner = inDownFrame->GetContent();
+ if (!mGestureDownFrameOwner) {
+ mGestureDownFrameOwner = mGestureDownContent;
+ }
+ }
+ mGestureModifiers = inDownEvent->mModifiers;
+ mGestureDownButtons = inDownEvent->buttons;
+
+ if (inDownEvent->mMessage != eMouseTouchDrag && Prefs::ClickHoldContextMenu()) {
+ // fire off a timer to track click-hold
+ CreateClickHoldTimer(aPresContext, inDownFrame, inDownEvent);
+ }
+}
+
+void
+EventStateManager::BeginTrackingRemoteDragGesture(nsIContent* aContent)
+{
+ mGestureDownContent = aContent;
+ mGestureDownFrameOwner = aContent;
+}
+
+//
+// StopTrackingDragGesture
+//
+// Record that the mouse has gone back up so that we should leave the TRACKING
+// state of d&d gesture tracker and return to the START state.
+//
+void
+EventStateManager::StopTrackingDragGesture()
+{
+ mGestureDownContent = nullptr;
+ mGestureDownFrameOwner = nullptr;
+}
+
+void
+EventStateManager::FillInEventFromGestureDown(WidgetMouseEvent* aEvent)
+{
+ NS_ASSERTION(aEvent->mWidget == mCurrentTarget->GetNearestWidget(),
+ "Incorrect widget in event");
+
+ // Set the coordinates in the new event to the coordinates of
+ // the old event, adjusted for the fact that the widget might be
+ // different
+ aEvent->mRefPoint =
+ mGestureDownPoint - aEvent->mWidget->WidgetToScreenOffset();
+ aEvent->mModifiers = mGestureModifiers;
+ aEvent->buttons = mGestureDownButtons;
+}
+
+//
+// GenerateDragGesture
+//
+// If we're in the TRACKING state of the d&d gesture tracker, check the current position
+// of the mouse in relation to the old one. If we've moved a sufficient amount from
+// the mouse down, then fire off a drag gesture event.
+void
+EventStateManager::GenerateDragGesture(nsPresContext* aPresContext,
+ WidgetInputEvent* aEvent)
+{
+ NS_ASSERTION(aPresContext, "This shouldn't happen.");
+ if (IsTrackingDragGesture()) {
+ mCurrentTarget = mGestureDownFrameOwner->GetPrimaryFrame();
+
+ if (!mCurrentTarget || !mCurrentTarget->GetNearestWidget()) {
+ StopTrackingDragGesture();
+ return;
+ }
+
+ // Check if selection is tracking drag gestures, if so
+ // don't interfere!
+ if (mCurrentTarget)
+ {
+ RefPtr<nsFrameSelection> frameSel = mCurrentTarget->GetFrameSelection();
+ if (frameSel && frameSel->GetDragState()) {
+ StopTrackingDragGesture();
+ return;
+ }
+ }
+
+ // If non-native code is capturing the mouse don't start a drag.
+ if (nsIPresShell::IsMouseCapturePreventingDrag()) {
+ StopTrackingDragGesture();
+ return;
+ }
+
+ static int32_t pixelThresholdX = 0;
+ static int32_t pixelThresholdY = 0;
+
+ if (!pixelThresholdX) {
+ pixelThresholdX =
+ LookAndFeel::GetInt(LookAndFeel::eIntID_DragThresholdX, 0);
+ pixelThresholdY =
+ LookAndFeel::GetInt(LookAndFeel::eIntID_DragThresholdY, 0);
+ if (!pixelThresholdX)
+ pixelThresholdX = 5;
+ if (!pixelThresholdY)
+ pixelThresholdY = 5;
+ }
+
+ // fire drag gesture if mouse has moved enough
+ LayoutDeviceIntPoint pt = aEvent->mWidget->WidgetToScreenOffset() +
+ (aEvent->AsTouchEvent() ? aEvent->AsTouchEvent()->mTouches[0]->mRefPoint
+ : aEvent->mRefPoint);
+ LayoutDeviceIntPoint distance = pt - mGestureDownPoint;
+ if (Abs(distance.x) > AssertedCast<uint32_t>(pixelThresholdX) ||
+ Abs(distance.y) > AssertedCast<uint32_t>(pixelThresholdY)) {
+ if (Prefs::ClickHoldContextMenu()) {
+ // stop the click-hold before we fire off the drag gesture, in case
+ // it takes a long time
+ KillClickHoldTimer();
+ }
+
+ nsCOMPtr<nsIDocShell> docshell = aPresContext->GetDocShell();
+ if (!docshell) {
+ return;
+ }
+
+ nsCOMPtr<nsPIDOMWindowOuter> window = docshell->GetWindow();
+ if (!window)
+ return;
+
+ RefPtr<DataTransfer> dataTransfer =
+ new DataTransfer(window, eDragStart, false, -1);
+
+ nsCOMPtr<nsISelection> selection;
+ nsCOMPtr<nsIContent> eventContent, targetContent;
+ mCurrentTarget->GetContentForEvent(aEvent, getter_AddRefs(eventContent));
+ if (eventContent)
+ DetermineDragTargetAndDefaultData(window, eventContent, dataTransfer,
+ getter_AddRefs(selection),
+ getter_AddRefs(targetContent));
+
+ // Stop tracking the drag gesture now. This should stop us from
+ // reentering GenerateDragGesture inside DOM event processing.
+ StopTrackingDragGesture();
+
+ if (!targetContent)
+ return;
+
+ // Use our targetContent, now that we've determined it, as the
+ // parent object of the DataTransfer.
+ dataTransfer->SetParentObject(targetContent);
+
+ sLastDragOverFrame = nullptr;
+ nsCOMPtr<nsIWidget> widget = mCurrentTarget->GetNearestWidget();
+
+ // get the widget from the target frame
+ WidgetDragEvent startEvent(aEvent->IsTrusted(), eDragStart, widget);
+ FillInEventFromGestureDown(&startEvent);
+
+ startEvent.mDataTransfer = dataTransfer;
+ if (aEvent->AsMouseEvent()) {
+ startEvent.inputSource = aEvent->AsMouseEvent()->inputSource;
+ } else if (aEvent->AsTouchEvent()) {
+ startEvent.inputSource = nsIDOMMouseEvent::MOZ_SOURCE_TOUCH;
+ } else {
+ MOZ_ASSERT(false);
+ }
+
+ // Dispatch to the DOM. By setting mCurrentTarget we are faking
+ // out the ESM and telling it that the current target frame is
+ // actually where the mouseDown occurred, otherwise it will use
+ // the frame the mouse is currently over which may or may not be
+ // the same. (Note: saari and I have decided that we don't have
+ // to reset |mCurrentTarget| when we're through because no one
+ // else is doing anything more with this event and it will get
+ // reset on the very next event to the correct frame).
+
+ // Hold onto old target content through the event and reset after.
+ nsCOMPtr<nsIContent> targetBeforeEvent = mCurrentTargetContent;
+
+ // Set the current target to the content for the mouse down
+ mCurrentTargetContent = targetContent;
+
+ // Dispatch the dragstart event to the DOM.
+ nsEventStatus status = nsEventStatus_eIgnore;
+ EventDispatcher::Dispatch(targetContent, aPresContext, &startEvent,
+ nullptr, &status);
+
+ WidgetDragEvent* event = &startEvent;
+
+ nsCOMPtr<nsIObserverService> observerService =
+ mozilla::services::GetObserverService();
+ // Emit observer event to allow addons to modify the DataTransfer object.
+ if (observerService) {
+ observerService->NotifyObservers(dataTransfer,
+ "on-datatransfer-available",
+ nullptr);
+ }
+
+ // now that the dataTransfer has been updated in the dragstart and
+ // draggesture events, make it read only so that the data doesn't
+ // change during the drag.
+ dataTransfer->SetReadOnly();
+
+ if (status != nsEventStatus_eConsumeNoDefault) {
+ bool dragStarted = DoDefaultDragStart(aPresContext, event, dataTransfer,
+ targetContent, selection);
+ if (dragStarted) {
+ sActiveESM = nullptr;
+ aEvent->StopPropagation();
+ }
+ }
+
+ // Reset mCurretTargetContent to what it was
+ mCurrentTargetContent = targetBeforeEvent;
+ }
+
+ // Now flush all pending notifications, for better responsiveness
+ // while dragging.
+ FlushPendingEvents(aPresContext);
+ }
+} // GenerateDragGesture
+
+void
+EventStateManager::DetermineDragTargetAndDefaultData(nsPIDOMWindowOuter* aWindow,
+ nsIContent* aSelectionTarget,
+ DataTransfer* aDataTransfer,
+ nsISelection** aSelection,
+ nsIContent** aTargetNode)
+{
+ *aTargetNode = nullptr;
+
+ // GetDragData determines if a selection, link or image in the content
+ // should be dragged, and places the data associated with the drag in the
+ // data transfer.
+ // mGestureDownContent is the node where the mousedown event for the drag
+ // occurred, and aSelectionTarget is the node to use when a selection is used
+ bool canDrag;
+ nsCOMPtr<nsIContent> dragDataNode;
+ bool wasAlt = (mGestureModifiers & MODIFIER_ALT) != 0;
+ nsresult rv = nsContentAreaDragDrop::GetDragData(aWindow, mGestureDownContent,
+ aSelectionTarget, wasAlt,
+ aDataTransfer, &canDrag, aSelection,
+ getter_AddRefs(dragDataNode));
+ if (NS_FAILED(rv) || !canDrag)
+ return;
+
+ // if GetDragData returned a node, use that as the node being dragged.
+ // Otherwise, if a selection is being dragged, use the node within the
+ // selection that was dragged. Otherwise, just use the mousedown target.
+ nsIContent* dragContent = mGestureDownContent;
+ if (dragDataNode)
+ dragContent = dragDataNode;
+ else if (*aSelection)
+ dragContent = aSelectionTarget;
+
+ nsIContent* originalDragContent = dragContent;
+
+ // If a selection isn't being dragged, look for an ancestor with the
+ // draggable property set. If one is found, use that as the target of the
+ // drag instead of the node that was clicked on. If a draggable node wasn't
+ // found, just use the clicked node.
+ if (!*aSelection) {
+ while (dragContent) {
+ nsCOMPtr<nsIDOMHTMLElement> htmlElement = do_QueryInterface(dragContent);
+ if (htmlElement) {
+ bool draggable = false;
+ htmlElement->GetDraggable(&draggable);
+ if (draggable)
+ break;
+ }
+ else {
+ nsCOMPtr<nsIDOMXULElement> xulElement = do_QueryInterface(dragContent);
+ if (xulElement) {
+ // All XUL elements are draggable, so if a XUL element is
+ // encountered, stop looking for draggable nodes and just use the
+ // original clicked node instead.
+ // XXXndeakin
+ // In the future, we will want to improve this so that XUL has a
+ // better way to specify whether something is draggable than just
+ // on/off.
+ dragContent = mGestureDownContent;
+ break;
+ }
+ // otherwise, it's not an HTML or XUL element, so just keep looking
+ }
+ dragContent = dragContent->GetParent();
+ }
+ }
+
+ // if no node in the hierarchy was found to drag, but the GetDragData method
+ // returned a node, use that returned node. Otherwise, nothing is draggable.
+ if (!dragContent && dragDataNode)
+ dragContent = dragDataNode;
+
+ if (dragContent) {
+ // if an ancestor node was used instead, clear the drag data
+ // XXXndeakin rework this a bit. Find a way to just not call GetDragData if we don't need to.
+ if (dragContent != originalDragContent)
+ aDataTransfer->ClearAll();
+ *aTargetNode = dragContent;
+ NS_ADDREF(*aTargetNode);
+ }
+}
+
+bool
+EventStateManager::DoDefaultDragStart(nsPresContext* aPresContext,
+ WidgetDragEvent* aDragEvent,
+ DataTransfer* aDataTransfer,
+ nsIContent* aDragTarget,
+ nsISelection* aSelection)
+{
+ nsCOMPtr<nsIDragService> dragService =
+ do_GetService("@mozilla.org/widget/dragservice;1");
+ if (!dragService)
+ return false;
+
+ // Default handling for the dragstart event.
+ //
+ // First, check if a drag session already exists. This means that the drag
+ // service was called directly within a draggesture handler. In this case,
+ // don't do anything more, as it is assumed that the handler is managing
+ // drag and drop manually. Make sure to return true to indicate that a drag
+ // began.
+ nsCOMPtr<nsIDragSession> dragSession;
+ dragService->GetCurrentSession(getter_AddRefs(dragSession));
+ if (dragSession)
+ return true;
+
+ // No drag session is currently active, so check if a handler added
+ // any items to be dragged. If not, there isn't anything to drag.
+ uint32_t count = 0;
+ if (aDataTransfer)
+ aDataTransfer->GetMozItemCount(&count);
+ if (!count)
+ return false;
+
+ // Get the target being dragged, which may not be the same as the
+ // target of the mouse event. If one wasn't set in the
+ // aDataTransfer during the event handler, just use the original
+ // target instead.
+ nsCOMPtr<nsIContent> dragTarget = aDataTransfer->GetDragTarget();
+ if (!dragTarget) {
+ dragTarget = aDragTarget;
+ if (!dragTarget)
+ return false;
+ }
+
+ // check which drag effect should initially be used. If the effect was not
+ // set, just use all actions, otherwise Windows won't allow a drop.
+ uint32_t action;
+ aDataTransfer->GetEffectAllowedInt(&action);
+ if (action == nsIDragService::DRAGDROP_ACTION_UNINITIALIZED)
+ action = nsIDragService::DRAGDROP_ACTION_COPY |
+ nsIDragService::DRAGDROP_ACTION_MOVE |
+ nsIDragService::DRAGDROP_ACTION_LINK;
+
+ // get any custom drag image that was set
+ int32_t imageX, imageY;
+ Element* dragImage = aDataTransfer->GetDragImage(&imageX, &imageY);
+
+ nsCOMPtr<nsIArray> transArray =
+ aDataTransfer->GetTransferables(dragTarget->AsDOMNode());
+ if (!transArray)
+ return false;
+
+ // XXXndeakin don't really want to create a new drag DOM event
+ // here, but we need something to pass to the InvokeDragSession
+ // methods.
+ RefPtr<DragEvent> event =
+ NS_NewDOMDragEvent(dragTarget, aPresContext, aDragEvent);
+
+ // Use InvokeDragSessionWithSelection if a selection is being dragged,
+ // such that the image can be generated from the selected text. However,
+ // use InvokeDragSessionWithImage if a custom image was set or something
+ // other than a selection is being dragged.
+ if (!dragImage && aSelection) {
+ dragService->InvokeDragSessionWithSelection(aSelection, transArray,
+ action, event, aDataTransfer);
+ }
+ else {
+ // if dragging within a XUL tree and no custom drag image was
+ // set, the region argument to InvokeDragSessionWithImage needs
+ // to be set to the area encompassing the selected rows of the
+ // tree to ensure that the drag feedback gets clipped to those
+ // rows. For other content, region should be null.
+ nsCOMPtr<nsIScriptableRegion> region;
+#ifdef MOZ_XUL
+ if (dragTarget && !dragImage) {
+ if (dragTarget->NodeInfo()->Equals(nsGkAtoms::treechildren,
+ kNameSpaceID_XUL)) {
+ nsTreeBodyFrame* treeBody =
+ do_QueryFrame(dragTarget->GetPrimaryFrame());
+ if (treeBody) {
+ treeBody->GetSelectionRegion(getter_AddRefs(region));
+ }
+ }
+ }
+#endif
+
+ dragService->InvokeDragSessionWithImage(dragTarget->AsDOMNode(), transArray,
+ region, action,
+ dragImage ? dragImage->AsDOMNode() :
+ nullptr,
+ imageX, imageY, event,
+ aDataTransfer);
+ }
+
+ return true;
+}
+
+nsresult
+EventStateManager::GetContentViewer(nsIContentViewer** aCv)
+{
+ *aCv = nullptr;
+
+ nsPIDOMWindowOuter* window = mDocument->GetWindow();
+ if (!window) return NS_ERROR_FAILURE;
+ nsCOMPtr<nsPIDOMWindowOuter> rootWindow = window->GetPrivateRoot();
+ if (!rootWindow) return NS_ERROR_FAILURE;
+
+ TabChild* tabChild = TabChild::GetFrom(rootWindow);
+ if (!tabChild) {
+ nsIFocusManager* fm = nsFocusManager::GetFocusManager();
+ if (!fm) return NS_ERROR_FAILURE;
+
+ nsCOMPtr<mozIDOMWindowProxy> activeWindow;
+ fm->GetActiveWindow(getter_AddRefs(activeWindow));
+ if (rootWindow != activeWindow) return NS_OK;
+ } else {
+ if (!tabChild->ParentIsActive()) return NS_OK;
+ }
+
+ nsCOMPtr<nsPIDOMWindowOuter> contentWindow = nsGlobalWindow::Cast(rootWindow)->GetContent();
+ if (!contentWindow) return NS_ERROR_FAILURE;
+
+ nsIDocument *doc = contentWindow->GetDoc();
+ if (!doc) return NS_ERROR_FAILURE;
+
+ nsCOMPtr<nsISupports> container = doc->GetContainer();
+ if (!container) return NS_ERROR_FAILURE;
+
+ nsCOMPtr<nsIDocShell> docshell = do_QueryInterface(container);
+ docshell->GetContentViewer(aCv);
+ if (!*aCv) return NS_ERROR_FAILURE;
+
+ return NS_OK;
+}
+
+nsresult
+EventStateManager::ChangeTextSize(int32_t change)
+{
+ nsCOMPtr<nsIContentViewer> cv;
+ nsresult rv = GetContentViewer(getter_AddRefs(cv));
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ if (cv) {
+ float textzoom;
+ float zoomMin = ((float)Preferences::GetInt("zoom.minPercent", 50)) / 100;
+ float zoomMax = ((float)Preferences::GetInt("zoom.maxPercent", 300)) / 100;
+ cv->GetTextZoom(&textzoom);
+ textzoom += ((float)change) / 10;
+ if (textzoom < zoomMin)
+ textzoom = zoomMin;
+ else if (textzoom > zoomMax)
+ textzoom = zoomMax;
+ cv->SetTextZoom(textzoom);
+ }
+
+ return NS_OK;
+}
+
+nsresult
+EventStateManager::ChangeFullZoom(int32_t change)
+{
+ nsCOMPtr<nsIContentViewer> cv;
+ nsresult rv = GetContentViewer(getter_AddRefs(cv));
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ if (cv) {
+ float fullzoom;
+ float zoomMin = ((float)Preferences::GetInt("zoom.minPercent", 50)) / 100;
+ float zoomMax = ((float)Preferences::GetInt("zoom.maxPercent", 300)) / 100;
+ cv->GetFullZoom(&fullzoom);
+ fullzoom += ((float)change) / 10;
+ if (fullzoom < zoomMin)
+ fullzoom = zoomMin;
+ else if (fullzoom > zoomMax)
+ fullzoom = zoomMax;
+ cv->SetFullZoom(fullzoom);
+ }
+
+ return NS_OK;
+}
+
+void
+EventStateManager::DoScrollHistory(int32_t direction)
+{
+ nsCOMPtr<nsISupports> pcContainer(mPresContext->GetContainerWeak());
+ if (pcContainer) {
+ nsCOMPtr<nsIWebNavigation> webNav(do_QueryInterface(pcContainer));
+ if (webNav) {
+ // positive direction to go back one step, nonpositive to go forward
+ if (direction > 0)
+ webNav->GoBack();
+ else
+ webNav->GoForward();
+ }
+ }
+}
+
+void
+EventStateManager::DoScrollZoom(nsIFrame* aTargetFrame,
+ int32_t adjustment)
+{
+ // Exclude form controls and content in chrome docshells.
+ nsIContent *content = aTargetFrame->GetContent();
+ if (content &&
+ !content->IsNodeOfType(nsINode::eHTML_FORM_CONTROL) &&
+ !nsContentUtils::IsInChromeDocshell(content->OwnerDoc()))
+ {
+ // positive adjustment to decrease zoom, negative to increase
+ int32_t change = (adjustment > 0) ? -1 : 1;
+
+ EnsureDocument(mPresContext);
+ if (Preferences::GetBool("browser.zoom.full") || content->OwnerDoc()->IsSyntheticDocument()) {
+ ChangeFullZoom(change);
+ } else {
+ ChangeTextSize(change);
+ }
+ nsContentUtils::DispatchChromeEvent(mDocument, static_cast<nsIDocument*>(mDocument),
+ NS_LITERAL_STRING("ZoomChangeUsingMouseWheel"),
+ true, true);
+ }
+}
+
+static nsIFrame*
+GetParentFrameToScroll(nsIFrame* aFrame)
+{
+ if (!aFrame)
+ return nullptr;
+
+ if (aFrame->StyleDisplay()->mPosition == NS_STYLE_POSITION_FIXED &&
+ nsLayoutUtils::IsReallyFixedPos(aFrame))
+ return aFrame->PresContext()->GetPresShell()->GetRootScrollFrame();
+
+ return aFrame->GetParent();
+}
+
+/*static*/ bool
+EventStateManager::CanVerticallyScrollFrameWithWheel(nsIFrame* aFrame)
+{
+ nsIContent* c = aFrame->GetContent();
+ if (!c) {
+ return true;
+ }
+ nsCOMPtr<nsITextControlElement> ctrl =
+ do_QueryInterface(c->IsInAnonymousSubtree() ? c->GetBindingParent() : c);
+ if (ctrl && ctrl->IsSingleLineTextControl()) {
+ return false;
+ }
+ return true;
+}
+
+void
+EventStateManager::DispatchLegacyMouseScrollEvents(nsIFrame* aTargetFrame,
+ WidgetWheelEvent* aEvent,
+ nsEventStatus* aStatus)
+{
+ MOZ_ASSERT(aEvent);
+ MOZ_ASSERT(aStatus);
+
+ if (!aTargetFrame || *aStatus == nsEventStatus_eConsumeNoDefault) {
+ return;
+ }
+
+ // Ignore mouse wheel transaction for computing legacy mouse wheel
+ // events' delta value.
+ nsIFrame* scrollFrame =
+ ComputeScrollTarget(aTargetFrame, aEvent,
+ COMPUTE_LEGACY_MOUSE_SCROLL_EVENT_TARGET);
+
+ nsIScrollableFrame* scrollTarget = do_QueryFrame(scrollFrame);
+ nsPresContext* pc =
+ scrollFrame ? scrollFrame->PresContext() : aTargetFrame->PresContext();
+
+ // DOM event's delta vales are computed from CSS pixels.
+ nsSize scrollAmount = GetScrollAmount(pc, aEvent, scrollTarget);
+ nsIntSize scrollAmountInCSSPixels(
+ nsPresContext::AppUnitsToIntCSSPixels(scrollAmount.width),
+ nsPresContext::AppUnitsToIntCSSPixels(scrollAmount.height));
+
+ // XXX We don't deal with fractional amount in legacy event, though the
+ // default action handler (DoScrollText()) deals with it.
+ // If we implemented such strict computation, we would need additional
+ // accumulated delta values. It would made the code more complicated.
+ // And also it would computes different delta values from older version.
+ // It doesn't make sense to implement such code for legacy events and
+ // rare cases.
+ int32_t scrollDeltaX, scrollDeltaY, pixelDeltaX, pixelDeltaY;
+ switch (aEvent->mDeltaMode) {
+ case nsIDOMWheelEvent::DOM_DELTA_PAGE:
+ scrollDeltaX =
+ !aEvent->mLineOrPageDeltaX ? 0 :
+ (aEvent->mLineOrPageDeltaX > 0 ? nsIDOMUIEvent::SCROLL_PAGE_DOWN :
+ nsIDOMUIEvent::SCROLL_PAGE_UP);
+ scrollDeltaY =
+ !aEvent->mLineOrPageDeltaY ? 0 :
+ (aEvent->mLineOrPageDeltaY > 0 ? nsIDOMUIEvent::SCROLL_PAGE_DOWN :
+ nsIDOMUIEvent::SCROLL_PAGE_UP);
+ pixelDeltaX = RoundDown(aEvent->mDeltaX * scrollAmountInCSSPixels.width);
+ pixelDeltaY = RoundDown(aEvent->mDeltaY * scrollAmountInCSSPixels.height);
+ break;
+
+ case nsIDOMWheelEvent::DOM_DELTA_LINE:
+ scrollDeltaX = aEvent->mLineOrPageDeltaX;
+ scrollDeltaY = aEvent->mLineOrPageDeltaY;
+ pixelDeltaX = RoundDown(aEvent->mDeltaX * scrollAmountInCSSPixels.width);
+ pixelDeltaY = RoundDown(aEvent->mDeltaY * scrollAmountInCSSPixels.height);
+ break;
+
+ case nsIDOMWheelEvent::DOM_DELTA_PIXEL:
+ scrollDeltaX = aEvent->mLineOrPageDeltaX;
+ scrollDeltaY = aEvent->mLineOrPageDeltaY;
+ pixelDeltaX = RoundDown(aEvent->mDeltaX);
+ pixelDeltaY = RoundDown(aEvent->mDeltaY);
+ break;
+
+ default:
+ MOZ_CRASH("Invalid deltaMode value comes");
+ }
+
+ // Send the legacy events in following order:
+ // 1. Vertical scroll
+ // 2. Vertical pixel scroll (even if #1 isn't consumed)
+ // 3. Horizontal scroll (even if #1 and/or #2 are consumed)
+ // 4. Horizontal pixel scroll (even if #3 isn't consumed)
+
+ nsWeakFrame targetFrame(aTargetFrame);
+
+ MOZ_ASSERT(*aStatus != nsEventStatus_eConsumeNoDefault &&
+ !aEvent->DefaultPrevented(),
+ "If you make legacy events dispatched for default prevented wheel "
+ "event, you need to initialize stateX and stateY");
+ EventState stateX, stateY;
+ if (scrollDeltaY) {
+ SendLineScrollEvent(aTargetFrame, aEvent, stateY,
+ scrollDeltaY, DELTA_DIRECTION_Y);
+ if (!targetFrame.IsAlive()) {
+ *aStatus = nsEventStatus_eConsumeNoDefault;
+ return;
+ }
+ }
+
+ if (pixelDeltaY) {
+ SendPixelScrollEvent(aTargetFrame, aEvent, stateY,
+ pixelDeltaY, DELTA_DIRECTION_Y);
+ if (!targetFrame.IsAlive()) {
+ *aStatus = nsEventStatus_eConsumeNoDefault;
+ return;
+ }
+ }
+
+ if (scrollDeltaX) {
+ SendLineScrollEvent(aTargetFrame, aEvent, stateX,
+ scrollDeltaX, DELTA_DIRECTION_X);
+ if (!targetFrame.IsAlive()) {
+ *aStatus = nsEventStatus_eConsumeNoDefault;
+ return;
+ }
+ }
+
+ if (pixelDeltaX) {
+ SendPixelScrollEvent(aTargetFrame, aEvent, stateX,
+ pixelDeltaX, DELTA_DIRECTION_X);
+ if (!targetFrame.IsAlive()) {
+ *aStatus = nsEventStatus_eConsumeNoDefault;
+ return;
+ }
+ }
+
+ if (stateY.mDefaultPrevented) {
+ *aStatus = nsEventStatus_eConsumeNoDefault;
+ aEvent->PreventDefault(!stateY.mDefaultPreventedByContent);
+ }
+
+ if (stateX.mDefaultPrevented) {
+ *aStatus = nsEventStatus_eConsumeNoDefault;
+ aEvent->PreventDefault(!stateX.mDefaultPreventedByContent);
+ }
+}
+
+void
+EventStateManager::SendLineScrollEvent(nsIFrame* aTargetFrame,
+ WidgetWheelEvent* aEvent,
+ EventState& aState,
+ int32_t aDelta,
+ DeltaDirection aDeltaDirection)
+{
+ nsCOMPtr<nsIContent> targetContent = aTargetFrame->GetContent();
+ if (!targetContent)
+ targetContent = GetFocusedContent();
+ if (!targetContent)
+ return;
+
+ while (targetContent->IsNodeOfType(nsINode::eTEXT)) {
+ targetContent = targetContent->GetParent();
+ }
+
+ WidgetMouseScrollEvent event(aEvent->IsTrusted(),
+ eLegacyMouseLineOrPageScroll, aEvent->mWidget);
+ event.mFlags.mDefaultPrevented = aState.mDefaultPrevented;
+ event.mFlags.mDefaultPreventedByContent = aState.mDefaultPreventedByContent;
+ event.mRefPoint = aEvent->mRefPoint;
+ event.mTime = aEvent->mTime;
+ event.mTimeStamp = aEvent->mTimeStamp;
+ event.mModifiers = aEvent->mModifiers;
+ event.buttons = aEvent->buttons;
+ event.mIsHorizontal = (aDeltaDirection == DELTA_DIRECTION_X);
+ event.mDelta = aDelta;
+ event.inputSource = aEvent->inputSource;
+
+ nsEventStatus status = nsEventStatus_eIgnore;
+ EventDispatcher::Dispatch(targetContent, aTargetFrame->PresContext(),
+ &event, nullptr, &status);
+ aState.mDefaultPrevented =
+ event.DefaultPrevented() || status == nsEventStatus_eConsumeNoDefault;
+ aState.mDefaultPreventedByContent = event.DefaultPreventedByContent();
+}
+
+void
+EventStateManager::SendPixelScrollEvent(nsIFrame* aTargetFrame,
+ WidgetWheelEvent* aEvent,
+ EventState& aState,
+ int32_t aPixelDelta,
+ DeltaDirection aDeltaDirection)
+{
+ nsCOMPtr<nsIContent> targetContent = aTargetFrame->GetContent();
+ if (!targetContent) {
+ targetContent = GetFocusedContent();
+ if (!targetContent)
+ return;
+ }
+
+ while (targetContent->IsNodeOfType(nsINode::eTEXT)) {
+ targetContent = targetContent->GetParent();
+ }
+
+ WidgetMouseScrollEvent event(aEvent->IsTrusted(),
+ eLegacyMousePixelScroll, aEvent->mWidget);
+ event.mFlags.mDefaultPrevented = aState.mDefaultPrevented;
+ event.mFlags.mDefaultPreventedByContent = aState.mDefaultPreventedByContent;
+ event.mRefPoint = aEvent->mRefPoint;
+ event.mTime = aEvent->mTime;
+ event.mTimeStamp = aEvent->mTimeStamp;
+ event.mModifiers = aEvent->mModifiers;
+ event.buttons = aEvent->buttons;
+ event.mIsHorizontal = (aDeltaDirection == DELTA_DIRECTION_X);
+ event.mDelta = aPixelDelta;
+ event.inputSource = aEvent->inputSource;
+
+ nsEventStatus status = nsEventStatus_eIgnore;
+ EventDispatcher::Dispatch(targetContent, aTargetFrame->PresContext(),
+ &event, nullptr, &status);
+ aState.mDefaultPrevented =
+ event.DefaultPrevented() || status == nsEventStatus_eConsumeNoDefault;
+ aState.mDefaultPreventedByContent = event.DefaultPreventedByContent();
+}
+
+nsIFrame*
+EventStateManager::ComputeScrollTarget(nsIFrame* aTargetFrame,
+ WidgetWheelEvent* aEvent,
+ ComputeScrollTargetOptions aOptions)
+{
+ return ComputeScrollTarget(aTargetFrame, aEvent->mDeltaX, aEvent->mDeltaY,
+ aEvent, aOptions);
+}
+
+// Overload ComputeScrollTarget method to allow passing "test" dx and dy when looking
+// for which scrollbarmediators to activate when two finger down on trackpad
+// and before any actual motion
+nsIFrame*
+EventStateManager::ComputeScrollTarget(nsIFrame* aTargetFrame,
+ double aDirectionX,
+ double aDirectionY,
+ WidgetWheelEvent* aEvent,
+ ComputeScrollTargetOptions aOptions)
+{
+ if ((aOptions & INCLUDE_PLUGIN_AS_TARGET) &&
+ !WheelPrefs::WheelEventsEnabledOnPlugins()) {
+ aOptions = RemovePluginFromTarget(aOptions);
+ }
+
+ if (aOptions & PREFER_MOUSE_WHEEL_TRANSACTION) {
+ // If the user recently scrolled with the mousewheel, then they probably
+ // want to scroll the same view as before instead of the view under the
+ // cursor. WheelTransaction tracks the frame currently being
+ // scrolled with the mousewheel. We consider the transaction ended when the
+ // mouse moves more than "mousewheel.transaction.ignoremovedelay"
+ // milliseconds after the last scroll operation, or any time the mouse moves
+ // out of the frame, or when more than "mousewheel.transaction.timeout"
+ // milliseconds have passed after the last operation, even if the mouse
+ // hasn't moved.
+ nsIFrame* lastScrollFrame = WheelTransaction::GetTargetFrame();
+ if (lastScrollFrame) {
+ if (aOptions & INCLUDE_PLUGIN_AS_TARGET) {
+ nsPluginFrame* pluginFrame = do_QueryFrame(lastScrollFrame);
+ if (pluginFrame &&
+ pluginFrame->WantsToHandleWheelEventAsDefaultAction()) {
+ return lastScrollFrame;
+ }
+ }
+ nsIScrollableFrame* scrollableFrame =
+ lastScrollFrame->GetScrollTargetFrame();
+ if (scrollableFrame) {
+ nsIFrame* frameToScroll = do_QueryFrame(scrollableFrame);
+ MOZ_ASSERT(frameToScroll);
+ return frameToScroll;
+ }
+ }
+ }
+
+ // If the event doesn't cause scroll actually, we cannot find scroll target
+ // because we check if the event can cause scroll actually on each found
+ // scrollable frame.
+ if (!aDirectionX && !aDirectionY) {
+ return nullptr;
+ }
+
+ bool checkIfScrollableX =
+ aDirectionX && (aOptions & PREFER_ACTUAL_SCROLLABLE_TARGET_ALONG_X_AXIS);
+ bool checkIfScrollableY =
+ aDirectionY && (aOptions & PREFER_ACTUAL_SCROLLABLE_TARGET_ALONG_Y_AXIS);
+
+ nsIFrame* scrollFrame =
+ !(aOptions & START_FROM_PARENT) ? aTargetFrame :
+ GetParentFrameToScroll(aTargetFrame);
+ for (; scrollFrame; scrollFrame = GetParentFrameToScroll(scrollFrame)) {
+ // Check whether the frame wants to provide us with a scrollable view.
+ nsIScrollableFrame* scrollableFrame = scrollFrame->GetScrollTargetFrame();
+ if (!scrollableFrame) {
+ // If the frame is a plugin frame, then, the plugin content may handle
+ // wheel events. Only when the caller computes the scroll target for
+ // default action handling, we should assume the plugin frame as
+ // scrollable if the plugin wants to handle wheel events as default
+ // action.
+ if (aOptions & INCLUDE_PLUGIN_AS_TARGET) {
+ nsPluginFrame* pluginFrame = do_QueryFrame(scrollFrame);
+ if (pluginFrame &&
+ pluginFrame->WantsToHandleWheelEventAsDefaultAction()) {
+ return scrollFrame;
+ }
+ }
+ nsMenuPopupFrame* menuPopupFrame = do_QueryFrame(scrollFrame);
+ if (menuPopupFrame) {
+ return nullptr;
+ }
+ continue;
+ }
+
+ nsIFrame* frameToScroll = do_QueryFrame(scrollableFrame);
+ MOZ_ASSERT(frameToScroll);
+
+ // Don't scroll vertically by mouse-wheel on a single-line text control.
+ if (checkIfScrollableY) {
+ if (!CanVerticallyScrollFrameWithWheel(scrollFrame)) {
+ continue;
+ }
+ }
+
+ if (!checkIfScrollableX && !checkIfScrollableY) {
+ return frameToScroll;
+ }
+
+ ScrollbarStyles ss = scrollableFrame->GetScrollbarStyles();
+ bool hiddenForV = (NS_STYLE_OVERFLOW_HIDDEN == ss.mVertical);
+ bool hiddenForH = (NS_STYLE_OVERFLOW_HIDDEN == ss.mHorizontal);
+ if ((hiddenForV && hiddenForH) ||
+ (checkIfScrollableY && !checkIfScrollableX && hiddenForV) ||
+ (checkIfScrollableX && !checkIfScrollableY && hiddenForH)) {
+ continue;
+ }
+
+ // For default action, we should climb up the tree if cannot scroll it
+ // by the event actually.
+ bool canScroll = WheelHandlingUtils::CanScrollOn(scrollableFrame,
+ aDirectionX, aDirectionY);
+ // Comboboxes need special care.
+ nsIComboboxControlFrame* comboBox = do_QueryFrame(scrollFrame);
+ if (comboBox) {
+ if (comboBox->IsDroppedDown()) {
+ // Don't propagate to parent when drop down menu is active.
+ return canScroll ? frameToScroll : nullptr;
+ }
+ // Always propagate when not dropped down (even if focused).
+ continue;
+ }
+
+ if (canScroll) {
+ return frameToScroll;
+ }
+ }
+
+ nsIFrame* newFrame = nsLayoutUtils::GetCrossDocParentFrame(
+ aTargetFrame->PresContext()->FrameManager()->GetRootFrame());
+ aOptions =
+ static_cast<ComputeScrollTargetOptions>(aOptions & ~START_FROM_PARENT);
+ return newFrame ? ComputeScrollTarget(newFrame, aEvent, aOptions) : nullptr;
+}
+
+nsSize
+EventStateManager::GetScrollAmount(nsPresContext* aPresContext,
+ WidgetWheelEvent* aEvent,
+ nsIScrollableFrame* aScrollableFrame)
+{
+ MOZ_ASSERT(aPresContext);
+ MOZ_ASSERT(aEvent);
+
+ bool isPage = (aEvent->mDeltaMode == nsIDOMWheelEvent::DOM_DELTA_PAGE);
+ if (aScrollableFrame) {
+ return isPage ? aScrollableFrame->GetPageScrollAmount() :
+ aScrollableFrame->GetLineScrollAmount();
+ }
+
+ // If there is no scrollable frame and page scrolling, use view port size.
+ if (isPage) {
+ return aPresContext->GetVisibleArea().Size();
+ }
+
+ // If there is no scrollable frame, we should use root frame's information.
+ nsIFrame* rootFrame = aPresContext->PresShell()->GetRootFrame();
+ if (!rootFrame) {
+ return nsSize(0, 0);
+ }
+ RefPtr<nsFontMetrics> fm =
+ nsLayoutUtils::GetInflatedFontMetricsForFrame(rootFrame);
+ NS_ENSURE_TRUE(fm, nsSize(0, 0));
+ return nsSize(fm->AveCharWidth(), fm->MaxHeight());
+}
+
+void
+EventStateManager::DoScrollText(nsIScrollableFrame* aScrollableFrame,
+ WidgetWheelEvent* aEvent)
+{
+ MOZ_ASSERT(aScrollableFrame);
+ MOZ_ASSERT(aEvent);
+
+ nsIFrame* scrollFrame = do_QueryFrame(aScrollableFrame);
+ MOZ_ASSERT(scrollFrame);
+
+ nsWeakFrame scrollFrameWeak(scrollFrame);
+ if (!WheelTransaction::WillHandleDefaultAction(aEvent, scrollFrameWeak)) {
+ return;
+ }
+
+ // Default action's actual scroll amount should be computed from device
+ // pixels.
+ nsPresContext* pc = scrollFrame->PresContext();
+ nsSize scrollAmount = GetScrollAmount(pc, aEvent, aScrollableFrame);
+ nsIntSize scrollAmountInDevPixels(
+ pc->AppUnitsToDevPixels(scrollAmount.width),
+ pc->AppUnitsToDevPixels(scrollAmount.height));
+ nsIntPoint actualDevPixelScrollAmount =
+ DeltaAccumulator::GetInstance()->
+ ComputeScrollAmountForDefaultAction(aEvent, scrollAmountInDevPixels);
+
+ // Don't scroll around the axis whose overflow style is hidden.
+ ScrollbarStyles overflowStyle = aScrollableFrame->GetScrollbarStyles();
+ if (overflowStyle.mHorizontal == NS_STYLE_OVERFLOW_HIDDEN) {
+ actualDevPixelScrollAmount.x = 0;
+ }
+ if (overflowStyle.mVertical == NS_STYLE_OVERFLOW_HIDDEN) {
+ actualDevPixelScrollAmount.y = 0;
+ }
+
+ nsIScrollbarMediator::ScrollSnapMode snapMode = nsIScrollbarMediator::DISABLE_SNAP;
+ nsIAtom* origin = nullptr;
+ switch (aEvent->mDeltaMode) {
+ case nsIDOMWheelEvent::DOM_DELTA_LINE:
+ origin = nsGkAtoms::mouseWheel;
+ snapMode = nsIScrollableFrame::ENABLE_SNAP;
+ break;
+ case nsIDOMWheelEvent::DOM_DELTA_PAGE:
+ origin = nsGkAtoms::pages;
+ snapMode = nsIScrollableFrame::ENABLE_SNAP;
+ break;
+ case nsIDOMWheelEvent::DOM_DELTA_PIXEL:
+ origin = nsGkAtoms::pixels;
+ break;
+ default:
+ MOZ_CRASH("Invalid deltaMode value comes");
+ }
+
+ // We shouldn't scroll more one page at once except when over one page scroll
+ // is allowed for the event.
+ nsSize pageSize = aScrollableFrame->GetPageScrollAmount();
+ nsIntSize devPixelPageSize(pc->AppUnitsToDevPixels(pageSize.width),
+ pc->AppUnitsToDevPixels(pageSize.height));
+ if (!WheelPrefs::GetInstance()->IsOverOnePageScrollAllowedX(aEvent) &&
+ DeprecatedAbs(actualDevPixelScrollAmount.x) > devPixelPageSize.width) {
+ actualDevPixelScrollAmount.x =
+ (actualDevPixelScrollAmount.x >= 0) ? devPixelPageSize.width :
+ -devPixelPageSize.width;
+ }
+
+ if (!WheelPrefs::GetInstance()->IsOverOnePageScrollAllowedY(aEvent) &&
+ DeprecatedAbs(actualDevPixelScrollAmount.y) > devPixelPageSize.height) {
+ actualDevPixelScrollAmount.y =
+ (actualDevPixelScrollAmount.y >= 0) ? devPixelPageSize.height :
+ -devPixelPageSize.height;
+ }
+
+ bool isDeltaModePixel =
+ (aEvent->mDeltaMode == nsIDOMWheelEvent::DOM_DELTA_PIXEL);
+
+ nsIScrollableFrame::ScrollMode mode;
+ switch (aEvent->mScrollType) {
+ case WidgetWheelEvent::SCROLL_DEFAULT:
+ if (isDeltaModePixel) {
+ mode = nsIScrollableFrame::NORMAL;
+ } else if (aEvent->mFlags.mHandledByAPZ) {
+ mode = nsIScrollableFrame::SMOOTH_MSD;
+ } else {
+ mode = nsIScrollableFrame::SMOOTH;
+ }
+ break;
+ case WidgetWheelEvent::SCROLL_SYNCHRONOUSLY:
+ mode = nsIScrollableFrame::INSTANT;
+ break;
+ case WidgetWheelEvent::SCROLL_ASYNCHRONOUSELY:
+ mode = nsIScrollableFrame::NORMAL;
+ break;
+ case WidgetWheelEvent::SCROLL_SMOOTHLY:
+ mode = nsIScrollableFrame::SMOOTH;
+ break;
+ default:
+ MOZ_CRASH("Invalid mScrollType value comes");
+ }
+
+ nsIScrollableFrame::ScrollMomentum momentum =
+ aEvent->mIsMomentum ? nsIScrollableFrame::SYNTHESIZED_MOMENTUM_EVENT
+ : nsIScrollableFrame::NOT_MOMENTUM;
+
+ nsIntPoint overflow;
+ aScrollableFrame->ScrollBy(actualDevPixelScrollAmount,
+ nsIScrollableFrame::DEVICE_PIXELS,
+ mode, &overflow, origin, momentum, snapMode);
+
+ if (!scrollFrameWeak.IsAlive()) {
+ // If the scroll causes changing the layout, we can think that the event
+ // has been completely consumed by the content. Then, users probably don't
+ // want additional action.
+ aEvent->mOverflowDeltaX = aEvent->mOverflowDeltaY = 0;
+ } else if (isDeltaModePixel) {
+ aEvent->mOverflowDeltaX = overflow.x;
+ aEvent->mOverflowDeltaY = overflow.y;
+ } else {
+ aEvent->mOverflowDeltaX =
+ static_cast<double>(overflow.x) / scrollAmountInDevPixels.width;
+ aEvent->mOverflowDeltaY =
+ static_cast<double>(overflow.y) / scrollAmountInDevPixels.height;
+ }
+
+ // If CSS overflow properties caused not to scroll, the overflowDelta* values
+ // should be same as delta* values since they may be used as gesture event by
+ // widget. However, if there is another scrollable element in the ancestor
+ // along the axis, probably users don't want the operation to cause
+ // additional action such as moving history. In such case, overflowDelta
+ // values should stay zero.
+ if (scrollFrameWeak.IsAlive()) {
+ if (aEvent->mDeltaX &&
+ overflowStyle.mHorizontal == NS_STYLE_OVERFLOW_HIDDEN &&
+ !ComputeScrollTarget(scrollFrame, aEvent,
+ COMPUTE_SCROLLABLE_ANCESTOR_ALONG_X_AXIS)) {
+ aEvent->mOverflowDeltaX = aEvent->mDeltaX;
+ }
+ if (aEvent->mDeltaY &&
+ overflowStyle.mVertical == NS_STYLE_OVERFLOW_HIDDEN &&
+ !ComputeScrollTarget(scrollFrame, aEvent,
+ COMPUTE_SCROLLABLE_ANCESTOR_ALONG_Y_AXIS)) {
+ aEvent->mOverflowDeltaY = aEvent->mDeltaY;
+ }
+ }
+
+ NS_ASSERTION(aEvent->mOverflowDeltaX == 0 ||
+ (aEvent->mOverflowDeltaX > 0) == (aEvent->mDeltaX > 0),
+ "The sign of mOverflowDeltaX is different from the scroll direction");
+ NS_ASSERTION(aEvent->mOverflowDeltaY == 0 ||
+ (aEvent->mOverflowDeltaY > 0) == (aEvent->mDeltaY > 0),
+ "The sign of mOverflowDeltaY is different from the scroll direction");
+
+ WheelPrefs::GetInstance()->CancelApplyingUserPrefsFromOverflowDelta(aEvent);
+}
+
+void
+EventStateManager::DecideGestureEvent(WidgetGestureNotifyEvent* aEvent,
+ nsIFrame* targetFrame)
+{
+
+ NS_ASSERTION(aEvent->mMessage == eGestureNotify,
+ "DecideGestureEvent called with a non-gesture event");
+
+ /* Check the ancestor tree to decide if any frame is willing* to receive
+ * a MozPixelScroll event. If that's the case, the current touch gesture
+ * will be used as a pan gesture; otherwise it will be a regular
+ * mousedown/mousemove/click event.
+ *
+ * *willing: determine if it makes sense to pan the element using scroll events:
+ * - For web content: if there are any visible scrollbars on the touch point
+ * - For XUL: if it's an scrollable element that can currently scroll in some
+ * direction.
+ *
+ * Note: we'll have to one-off various cases to ensure a good usable behavior
+ */
+ WidgetGestureNotifyEvent::PanDirection panDirection =
+ WidgetGestureNotifyEvent::ePanNone;
+ bool displayPanFeedback = false;
+ for (nsIFrame* current = targetFrame; current;
+ current = nsLayoutUtils::GetCrossDocParentFrame(current)) {
+
+ // e10s - mark remote content as pannable. This is a work around since
+ // we don't have access to remote frame scroll info here. Apz data may
+ // assist is solving this.
+ if (current && IsRemoteTarget(current->GetContent())) {
+ panDirection = WidgetGestureNotifyEvent::ePanBoth;
+ // We don't know when we reach bounds, so just disable feedback for now.
+ displayPanFeedback = false;
+ break;
+ }
+
+ nsIAtom* currentFrameType = current->GetType();
+
+ // Scrollbars should always be draggable
+ if (currentFrameType == nsGkAtoms::scrollbarFrame) {
+ panDirection = WidgetGestureNotifyEvent::ePanNone;
+ break;
+ }
+
+#ifdef MOZ_XUL
+ // Special check for trees
+ nsTreeBodyFrame* treeFrame = do_QueryFrame(current);
+ if (treeFrame) {
+ if (treeFrame->GetHorizontalOverflow()) {
+ panDirection = WidgetGestureNotifyEvent::ePanHorizontal;
+ }
+ if (treeFrame->GetVerticalOverflow()) {
+ panDirection = WidgetGestureNotifyEvent::ePanVertical;
+ }
+ break;
+ }
+#endif
+
+ nsIScrollableFrame* scrollableFrame = do_QueryFrame(current);
+ if (scrollableFrame) {
+ if (current->IsFrameOfType(nsIFrame::eXULBox)) {
+ displayPanFeedback = true;
+
+ nsRect scrollRange = scrollableFrame->GetScrollRange();
+ bool canScrollHorizontally = scrollRange.width > 0;
+
+ if (targetFrame->GetType() == nsGkAtoms::menuFrame) {
+ // menu frames report horizontal scroll when they have submenus
+ // and we don't want that
+ canScrollHorizontally = false;
+ displayPanFeedback = false;
+ }
+
+ // Vertical panning has priority over horizontal panning, so
+ // when vertical movement is possible we can just finish the loop.
+ if (scrollRange.height > 0) {
+ panDirection = WidgetGestureNotifyEvent::ePanVertical;
+ break;
+ }
+
+ if (canScrollHorizontally) {
+ panDirection = WidgetGestureNotifyEvent::ePanHorizontal;
+ displayPanFeedback = false;
+ }
+ } else { //Not a XUL box
+ uint32_t scrollbarVisibility = scrollableFrame->GetScrollbarVisibility();
+
+ //Check if we have visible scrollbars
+ if (scrollbarVisibility & nsIScrollableFrame::VERTICAL) {
+ panDirection = WidgetGestureNotifyEvent::ePanVertical;
+ displayPanFeedback = true;
+ break;
+ }
+
+ if (scrollbarVisibility & nsIScrollableFrame::HORIZONTAL) {
+ panDirection = WidgetGestureNotifyEvent::ePanHorizontal;
+ displayPanFeedback = true;
+ }
+ }
+ } //scrollableFrame
+ } //ancestor chain
+ aEvent->mDisplayPanFeedback = displayPanFeedback;
+ aEvent->mPanDirection = panDirection;
+}
+
+#ifdef XP_MACOSX
+static bool
+NodeAllowsClickThrough(nsINode* aNode)
+{
+ while (aNode) {
+ if (aNode->IsXULElement()) {
+ mozilla::dom::Element* element = aNode->AsElement();
+ static nsIContent::AttrValuesArray strings[] =
+ {&nsGkAtoms::always, &nsGkAtoms::never, nullptr};
+ switch (element->FindAttrValueIn(kNameSpaceID_None, nsGkAtoms::clickthrough,
+ strings, eCaseMatters)) {
+ case 0:
+ return true;
+ case 1:
+ return false;
+ }
+ }
+ aNode = nsContentUtils::GetCrossDocParentNode(aNode);
+ }
+ return true;
+}
+#endif
+
+void
+EventStateManager::PostHandleKeyboardEvent(WidgetKeyboardEvent* aKeyboardEvent,
+ nsEventStatus& aStatus,
+ bool dispatchedToContentProcess)
+{
+ if (aStatus == nsEventStatus_eConsumeNoDefault ||
+ aKeyboardEvent->mInputMethodAppState == WidgetKeyboardEvent::eHandling) {
+ return;
+ }
+
+ // XXX Currently, our automated tests don't support mKeyNameIndex.
+ // Therefore, we still need to handle this with keyCode.
+ switch(aKeyboardEvent->mKeyCode) {
+ case NS_VK_TAB:
+ case NS_VK_F6:
+ // This is to prevent keyboard scrolling while alt modifier in use.
+ if (!aKeyboardEvent->IsAlt()) {
+ aStatus = nsEventStatus_eConsumeNoDefault;
+
+ // Handling the tab event after it was sent to content is bad,
+ // because to the FocusManager the remote-browser looks like one
+ // element, so we would just move the focus to the next element
+ // in chrome, instead of handling it in content.
+ if (dispatchedToContentProcess)
+ break;
+
+ EnsureDocument(mPresContext);
+ nsIFocusManager* fm = nsFocusManager::GetFocusManager();
+ if (fm && mDocument) {
+ // Shift focus forward or back depending on shift key
+ bool isDocMove =
+ aKeyboardEvent->IsControl() || aKeyboardEvent->mKeyCode == NS_VK_F6;
+ uint32_t dir = aKeyboardEvent->IsShift() ?
+ (isDocMove ? static_cast<uint32_t>(nsIFocusManager::MOVEFOCUS_BACKWARDDOC) :
+ static_cast<uint32_t>(nsIFocusManager::MOVEFOCUS_BACKWARD)) :
+ (isDocMove ? static_cast<uint32_t>(nsIFocusManager::MOVEFOCUS_FORWARDDOC) :
+ static_cast<uint32_t>(nsIFocusManager::MOVEFOCUS_FORWARD));
+ nsCOMPtr<nsIDOMElement> result;
+ fm->MoveFocus(mDocument->GetWindow(), nullptr, dir,
+ nsIFocusManager::FLAG_BYKEY,
+ getter_AddRefs(result));
+ }
+ }
+ return;
+ case 0:
+ // We handle keys with no specific keycode value below.
+ break;
+ default:
+ return;
+ }
+
+ switch(aKeyboardEvent->mKeyNameIndex) {
+ case KEY_NAME_INDEX_ZoomIn:
+ case KEY_NAME_INDEX_ZoomOut:
+ ChangeFullZoom(
+ aKeyboardEvent->mKeyNameIndex == KEY_NAME_INDEX_ZoomIn ? 1 : -1);
+ aStatus = nsEventStatus_eConsumeNoDefault;
+ break;
+ default:
+ break;
+ }
+}
+
+nsresult
+EventStateManager::PostHandleEvent(nsPresContext* aPresContext,
+ WidgetEvent* aEvent,
+ nsIFrame* aTargetFrame,
+ nsEventStatus* aStatus)
+{
+ NS_ENSURE_ARG(aPresContext);
+ NS_ENSURE_ARG_POINTER(aStatus);
+
+ mCurrentTarget = aTargetFrame;
+ mCurrentTargetContent = nullptr;
+
+ bool dispatchedToContentProcess = HandleCrossProcessEvent(aEvent, aStatus);
+ // NOTE: the above call may have destroyed aTargetFrame, please use
+ // mCurrentTarget henceforth. This is to avoid using it accidentally:
+ aTargetFrame = nullptr;
+
+ // Most of the events we handle below require a frame.
+ // Add special cases here.
+ if (!mCurrentTarget && aEvent->mMessage != eMouseUp &&
+ aEvent->mMessage != eMouseDown) {
+ return NS_OK;
+ }
+
+ //Keep the prescontext alive, we might need it after event dispatch
+ RefPtr<nsPresContext> presContext = aPresContext;
+ nsresult ret = NS_OK;
+
+ switch (aEvent->mMessage) {
+ case eMouseDown:
+ {
+ WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent();
+ if (mouseEvent->button == WidgetMouseEvent::eLeftButton &&
+ !sNormalLMouseEventInProcess) {
+ // We got a mouseup event while a mousedown event was being processed.
+ // Make sure that the capturing content is cleared.
+ nsIPresShell::SetCapturingContent(nullptr, 0);
+ break;
+ }
+
+ // For remote content, capture the event in the parent process at the
+ // <xul:browser remote> element. This will ensure that subsequent mousemove/mouseup
+ // events will continue to be dispatched to this element and therefore forwarded
+ // to the child.
+ if (dispatchedToContentProcess && !nsIPresShell::GetCapturingContent()) {
+ nsIContent* content = mCurrentTarget ? mCurrentTarget->GetContent() : nullptr;
+ nsIPresShell::SetCapturingContent(content, 0);
+ }
+
+ nsCOMPtr<nsIContent> activeContent;
+ if (nsEventStatus_eConsumeNoDefault != *aStatus) {
+ nsCOMPtr<nsIContent> newFocus;
+ bool suppressBlur = false;
+ if (mCurrentTarget) {
+ mCurrentTarget->GetContentForEvent(aEvent, getter_AddRefs(newFocus));
+ const nsStyleUserInterface* ui = mCurrentTarget->StyleUserInterface();
+ activeContent = mCurrentTarget->GetContent();
+
+ // In some cases, we do not want to even blur the current focused
+ // element. Those cases are:
+ // 1. -moz-user-focus CSS property is set to 'ignore';
+ // 2. Element with NS_EVENT_STATE_DISABLED
+ // (aka :disabled pseudo-class for HTML element);
+ // 3. XUL control element has the disabled property set to 'true'.
+ //
+ // We can't use nsIFrame::IsFocusable() because we want to blur when
+ // we click on a visibility: none element.
+ // We can't use nsIContent::IsFocusable() because we want to blur when
+ // we click on a non-focusable element like a <div>.
+ // We have to use |aEvent->mTarget| to not make sure we do not check
+ // an anonymous node of the targeted element.
+ suppressBlur = (ui->mUserFocus == StyleUserFocus::Ignore);
+
+ if (!suppressBlur) {
+ nsCOMPtr<Element> element = do_QueryInterface(aEvent->mTarget);
+ suppressBlur = element &&
+ element->State().HasState(NS_EVENT_STATE_DISABLED);
+ }
+
+ if (!suppressBlur) {
+ nsCOMPtr<nsIDOMXULControlElement> xulControl =
+ do_QueryInterface(aEvent->mTarget);
+ if (xulControl) {
+ bool disabled;
+ xulControl->GetDisabled(&disabled);
+ suppressBlur = disabled;
+ }
+ }
+ }
+
+ if (!suppressBlur) {
+ suppressBlur = nsContentUtils::IsUserFocusIgnored(activeContent);
+ }
+
+ nsIFrame* currFrame = mCurrentTarget;
+
+ // When a root content which isn't editable but has an editable HTML
+ // <body> element is clicked, we should redirect the focus to the
+ // the <body> element. E.g., when an user click bottom of the editor
+ // where is outside of the <body> element, the <body> should be focused
+ // and the user can edit immediately after that.
+ //
+ // NOTE: The newFocus isn't editable that also means it's not in
+ // designMode. In designMode, all contents are not focusable.
+ if (newFocus && !newFocus->IsEditable()) {
+ nsIDocument *doc = newFocus->GetComposedDoc();
+ if (doc && newFocus == doc->GetRootElement()) {
+ nsIContent *bodyContent =
+ nsLayoutUtils::GetEditableRootContentByContentEditable(doc);
+ if (bodyContent) {
+ nsIFrame* bodyFrame = bodyContent->GetPrimaryFrame();
+ if (bodyFrame) {
+ currFrame = bodyFrame;
+ newFocus = bodyContent;
+ }
+ }
+ }
+ }
+
+ // When the mouse is pressed, the default action is to focus the
+ // target. Look for the nearest enclosing focusable frame.
+ while (currFrame) {
+ // If the mousedown happened inside a popup, don't
+ // try to set focus on one of its containing elements
+ const nsStyleDisplay* display = currFrame->StyleDisplay();
+ if (display->mDisplay == StyleDisplay::Popup) {
+ newFocus = nullptr;
+ break;
+ }
+
+ int32_t tabIndexUnused;
+ if (currFrame->IsFocusable(&tabIndexUnused, true)) {
+ newFocus = currFrame->GetContent();
+ nsCOMPtr<nsIDOMElement> domElement(do_QueryInterface(newFocus));
+ if (domElement)
+ break;
+ }
+ currFrame = currFrame->GetParent();
+ }
+
+ nsIFocusManager* fm = nsFocusManager::GetFocusManager();
+ if (fm) {
+ // if something was found to focus, focus it. Otherwise, if the
+ // element that was clicked doesn't have -moz-user-focus: ignore,
+ // clear the existing focus. For -moz-user-focus: ignore, the focus
+ // is just left as is.
+ // Another effect of mouse clicking, handled in nsSelection, is that
+ // it should update the caret position to where the mouse was
+ // clicked. Because the focus is cleared when clicking on a
+ // non-focusable node, the next press of the tab key will cause
+ // focus to be shifted from the caret position instead of the root.
+ if (newFocus && currFrame) {
+ // use the mouse flag and the noscroll flag so that the content
+ // doesn't unexpectedly scroll when clicking an element that is
+ // only half visible
+ uint32_t flags = nsIFocusManager::FLAG_BYMOUSE |
+ nsIFocusManager::FLAG_NOSCROLL;
+ // If this was a touch-generated event, pass that information:
+ if (mouseEvent->inputSource == nsIDOMMouseEvent::MOZ_SOURCE_TOUCH) {
+ flags |= nsIFocusManager::FLAG_BYTOUCH;
+ }
+ nsCOMPtr<nsIDOMElement> newFocusElement = do_QueryInterface(newFocus);
+ fm->SetFocus(newFocusElement, flags);
+ }
+ else if (!suppressBlur) {
+ // clear the focus within the frame and then set it as the
+ // focused frame
+ EnsureDocument(mPresContext);
+ if (mDocument) {
+#ifdef XP_MACOSX
+ if (!activeContent || !activeContent->IsXULElement())
+#endif
+ fm->ClearFocus(mDocument->GetWindow());
+ fm->SetFocusedWindow(mDocument->GetWindow());
+ }
+ }
+ }
+
+ // The rest is left button-specific.
+ if (mouseEvent->button != WidgetMouseEvent::eLeftButton) {
+ break;
+ }
+
+ if (activeContent) {
+ // The nearest enclosing element goes into the
+ // :active state. If we fail the QI to DOMElement,
+ // then we know we're only a node, and that we need
+ // to obtain our parent element and put it into :active
+ // instead.
+ nsCOMPtr<nsIDOMElement> elt(do_QueryInterface(activeContent));
+ if (!elt) {
+ nsIContent* par = activeContent->GetParent();
+ if (par)
+ activeContent = par;
+ }
+ }
+ }
+ else {
+ // if we're here, the event handler returned false, so stop
+ // any of our own processing of a drag. Workaround for bug 43258.
+ StopTrackingDragGesture();
+
+ // When the event was cancelled, there is currently a chrome document
+ // focused and a mousedown just occurred on a content document, ensure
+ // that the window that was clicked is focused.
+ EnsureDocument(mPresContext);
+ nsIFocusManager* fm = nsFocusManager::GetFocusManager();
+ if (mDocument && fm) {
+ nsCOMPtr<mozIDOMWindowProxy> window;
+ fm->GetFocusedWindow(getter_AddRefs(window));
+ auto* currentWindow = nsPIDOMWindowOuter::From(window);
+ if (currentWindow && mDocument->GetWindow() &&
+ currentWindow != mDocument->GetWindow() &&
+ !nsContentUtils::IsChromeDoc(mDocument)) {
+ nsCOMPtr<nsPIDOMWindowOuter> currentTop;
+ nsCOMPtr<nsPIDOMWindowOuter> newTop;
+ currentTop = currentWindow->GetTop();
+ newTop = mDocument->GetWindow()->GetTop();
+ nsCOMPtr<nsIDocument> currentDoc = currentWindow->GetExtantDoc();
+ if (nsContentUtils::IsChromeDoc(currentDoc) ||
+ (currentTop && newTop && currentTop != newTop)) {
+ fm->SetFocusedWindow(mDocument->GetWindow());
+ }
+ }
+ }
+ }
+ SetActiveManager(this, activeContent);
+ }
+ break;
+ case ePointerCancel: {
+ if(WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent()) {
+ GenerateMouseEnterExit(mouseEvent);
+ }
+ // After firing the pointercancel event, a user agent must also fire a
+ // pointerout event followed by a pointerleave event.
+ MOZ_FALLTHROUGH;
+ }
+ case ePointerUp: {
+ WidgetPointerEvent* pointerEvent = aEvent->AsPointerEvent();
+ // After UP/Cancel Touch pointers become invalid so we can remove relevant helper from Table
+ // Mouse/Pen pointers are valid all the time (not only between down/up)
+ if (pointerEvent->inputSource == nsIDOMMouseEvent::MOZ_SOURCE_TOUCH) {
+ mPointersEnterLeaveHelper.Remove(pointerEvent->pointerId);
+ GenerateMouseEnterExit(pointerEvent);
+ }
+ break;
+ }
+ case eMouseUp:
+ {
+ ClearGlobalActiveContent(this);
+ WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent();
+ if (mouseEvent && mouseEvent->IsReal()) {
+ if (!mCurrentTarget) {
+ GetEventTarget();
+ }
+ // Make sure to dispatch the click even if there is no frame for
+ // the current target element. This is required for Web compatibility.
+ ret = CheckForAndDispatchClick(mouseEvent, aStatus);
+ }
+
+ nsIPresShell *shell = presContext->GetPresShell();
+ if (shell) {
+ RefPtr<nsFrameSelection> frameSelection = shell->FrameSelection();
+ frameSelection->SetDragState(false);
+ }
+ }
+ break;
+ case eWheelOperationEnd:
+ {
+ MOZ_ASSERT(aEvent->IsTrusted());
+ ScrollbarsForWheel::MayInactivate();
+ WidgetWheelEvent* wheelEvent = aEvent->AsWheelEvent();
+ nsIScrollableFrame* scrollTarget =
+ do_QueryFrame(ComputeScrollTarget(mCurrentTarget, wheelEvent,
+ COMPUTE_DEFAULT_ACTION_TARGET));
+ if (scrollTarget) {
+ scrollTarget->ScrollSnap();
+ }
+ }
+ break;
+ case eWheel:
+ case eWheelOperationStart:
+ {
+ MOZ_ASSERT(aEvent->IsTrusted());
+
+ if (*aStatus == nsEventStatus_eConsumeNoDefault) {
+ ScrollbarsForWheel::Inactivate();
+ break;
+ }
+
+ WidgetWheelEvent* wheelEvent = aEvent->AsWheelEvent();
+
+ // Check if the frame to scroll before checking the default action
+ // because if the scroll target is a plugin, the default action should be
+ // chosen by the plugin rather than by our prefs.
+ nsIFrame* frameToScroll =
+ ComputeScrollTarget(mCurrentTarget, wheelEvent,
+ COMPUTE_DEFAULT_ACTION_TARGET);
+ nsPluginFrame* pluginFrame = do_QueryFrame(frameToScroll);
+
+ // When APZ is enabled, the actual scroll animation might be handled by
+ // the compositor.
+ WheelPrefs::Action action;
+ if (pluginFrame) {
+ MOZ_ASSERT(pluginFrame->WantsToHandleWheelEventAsDefaultAction());
+ action = WheelPrefs::ACTION_SEND_TO_PLUGIN;
+ } else if (wheelEvent->mFlags.mHandledByAPZ) {
+ action = WheelPrefs::ACTION_NONE;
+ } else {
+ action = WheelPrefs::GetInstance()->ComputeActionFor(wheelEvent);
+ }
+ switch (action) {
+ case WheelPrefs::ACTION_SCROLL: {
+ // For scrolling of default action, we should honor the mouse wheel
+ // transaction.
+
+ ScrollbarsForWheel::PrepareToScrollText(this, mCurrentTarget, wheelEvent);
+
+ if (aEvent->mMessage != eWheel ||
+ (!wheelEvent->mDeltaX && !wheelEvent->mDeltaY)) {
+ break;
+ }
+
+ nsIScrollableFrame* scrollTarget = do_QueryFrame(frameToScroll);
+ ScrollbarsForWheel::SetActiveScrollTarget(scrollTarget);
+
+ nsIFrame* rootScrollFrame = !mCurrentTarget ? nullptr :
+ mCurrentTarget->PresContext()->PresShell()->GetRootScrollFrame();
+ nsIScrollableFrame* rootScrollableFrame = nullptr;
+ if (rootScrollFrame) {
+ rootScrollableFrame = do_QueryFrame(rootScrollFrame);
+ }
+ if (!scrollTarget || scrollTarget == rootScrollableFrame) {
+ wheelEvent->mViewPortIsOverscrolled = true;
+ }
+ wheelEvent->mOverflowDeltaX = wheelEvent->mDeltaX;
+ wheelEvent->mOverflowDeltaY = wheelEvent->mDeltaY;
+ WheelPrefs::GetInstance()->
+ CancelApplyingUserPrefsFromOverflowDelta(wheelEvent);
+ if (scrollTarget) {
+ DoScrollText(scrollTarget, wheelEvent);
+ } else {
+ WheelTransaction::EndTransaction();
+ ScrollbarsForWheel::Inactivate();
+ }
+ break;
+ }
+ case WheelPrefs::ACTION_HISTORY: {
+ // If this event doesn't cause eLegacyMouseLineOrPageScroll event or
+ // the direction is oblique, don't perform history back/forward.
+ int32_t intDelta = wheelEvent->GetPreferredIntDelta();
+ if (!intDelta) {
+ break;
+ }
+ DoScrollHistory(intDelta);
+ break;
+ }
+ case WheelPrefs::ACTION_ZOOM: {
+ // If this event doesn't cause eLegacyMouseLineOrPageScroll event or
+ // the direction is oblique, don't perform zoom in/out.
+ int32_t intDelta = wheelEvent->GetPreferredIntDelta();
+ if (!intDelta) {
+ break;
+ }
+ DoScrollZoom(mCurrentTarget, intDelta);
+ break;
+ }
+ case WheelPrefs::ACTION_SEND_TO_PLUGIN:
+ MOZ_ASSERT(pluginFrame);
+
+ if (wheelEvent->mMessage != eWheel ||
+ (!wheelEvent->mDeltaX && !wheelEvent->mDeltaY)) {
+ break;
+ }
+
+ MOZ_ASSERT(static_cast<void*>(frameToScroll) ==
+ static_cast<void*>(pluginFrame));
+ if (!WheelTransaction::WillHandleDefaultAction(wheelEvent,
+ frameToScroll)) {
+ break;
+ }
+
+ pluginFrame->HandleWheelEventAsDefaultAction(wheelEvent);
+ break;
+ case WheelPrefs::ACTION_NONE:
+ default:
+ bool allDeltaOverflown = false;
+ if (wheelEvent->mFlags.mHandledByAPZ) {
+ if (wheelEvent->mCanTriggerSwipe) {
+ // For events that can trigger swipes, APZ needs to know whether
+ // scrolling is possible in the requested direction. It does this
+ // by looking at the scroll overflow values on mCanTriggerSwipe
+ // events after they have been processed.
+ allDeltaOverflown =
+ !ComputeScrollTarget(mCurrentTarget, wheelEvent,
+ COMPUTE_DEFAULT_ACTION_TARGET);
+ }
+ } else {
+ // The event was processed neither by APZ nor by us, so all of the
+ // delta values must be overflown delta values.
+ allDeltaOverflown = true;
+ }
+
+ if (!allDeltaOverflown) {
+ break;
+ }
+ wheelEvent->mOverflowDeltaX = wheelEvent->mDeltaX;
+ wheelEvent->mOverflowDeltaY = wheelEvent->mDeltaY;
+ WheelPrefs::GetInstance()->
+ CancelApplyingUserPrefsFromOverflowDelta(wheelEvent);
+ wheelEvent->mViewPortIsOverscrolled = true;
+ break;
+ }
+ *aStatus = nsEventStatus_eConsumeNoDefault;
+ }
+ break;
+
+ case eGestureNotify:
+ {
+ if (nsEventStatus_eConsumeNoDefault != *aStatus) {
+ DecideGestureEvent(aEvent->AsGestureNotifyEvent(), mCurrentTarget);
+ }
+ }
+ break;
+
+ case eDragEnter:
+ case eDragOver:
+ {
+ NS_ASSERTION(aEvent->mClass == eDragEventClass, "Expected a drag event");
+
+ nsCOMPtr<nsIDragSession> dragSession = nsContentUtils::GetDragSession();
+ if (!dragSession)
+ break;
+
+ // Reset the flag.
+ dragSession->SetOnlyChromeDrop(false);
+ if (mPresContext) {
+ EnsureDocument(mPresContext);
+ }
+ bool isChromeDoc = nsContentUtils::IsChromeDoc(mDocument);
+
+ // the initial dataTransfer is the one from the dragstart event that
+ // was set on the dragSession when the drag began.
+ nsCOMPtr<nsIDOMDataTransfer> dataTransfer;
+ nsCOMPtr<nsIDOMDataTransfer> initialDataTransfer;
+ dragSession->GetDataTransfer(getter_AddRefs(initialDataTransfer));
+
+ WidgetDragEvent *dragEvent = aEvent->AsDragEvent();
+
+ // collect any changes to moz cursor settings stored in the event's
+ // data transfer.
+ UpdateDragDataTransfer(dragEvent);
+
+ // cancelling a dragenter or dragover event means that a drop should be
+ // allowed, so update the dropEffect and the canDrop state to indicate
+ // that a drag is allowed. If the event isn't cancelled, a drop won't be
+ // allowed. Essentially, to allow a drop somewhere, specify the effects
+ // using the effectAllowed and dropEffect properties in a dragenter or
+ // dragover event and cancel the event. To not allow a drop somewhere,
+ // don't cancel the event or set the effectAllowed or dropEffect to
+ // "none". This way, if the event is just ignored, no drop will be
+ // allowed.
+ uint32_t dropEffect = nsIDragService::DRAGDROP_ACTION_NONE;
+ uint32_t action = nsIDragService::DRAGDROP_ACTION_NONE;
+ if (nsEventStatus_eConsumeNoDefault == *aStatus) {
+ // if the event has a dataTransfer set, use it.
+ if (dragEvent->mDataTransfer) {
+ // get the dataTransfer and the dropEffect that was set on it
+ dataTransfer = do_QueryInterface(dragEvent->mDataTransfer);
+ dataTransfer->GetDropEffectInt(&dropEffect);
+ }
+ else {
+ // if dragEvent->mDataTransfer is null, it means that no attempt was
+ // made to access the dataTransfer during the event, yet the event
+ // was cancelled. Instead, use the initial data transfer available
+ // from the drag session. The drop effect would not have been
+ // initialized (which is done in DragEvent::GetDataTransfer),
+ // so set it from the drag action. We'll still want to filter it
+ // based on the effectAllowed below.
+ dataTransfer = initialDataTransfer;
+
+ dragSession->GetDragAction(&action);
+
+ // filter the drop effect based on the action. Use UNINITIALIZED as
+ // any effect is allowed.
+ dropEffect = nsContentUtils::FilterDropEffect(action,
+ nsIDragService::DRAGDROP_ACTION_UNINITIALIZED);
+ }
+
+ // At this point, if the dataTransfer is null, it means that the
+ // drag was originally started by directly calling the drag service.
+ // Just assume that all effects are allowed.
+ uint32_t effectAllowed = nsIDragService::DRAGDROP_ACTION_UNINITIALIZED;
+ if (dataTransfer)
+ dataTransfer->GetEffectAllowedInt(&effectAllowed);
+
+ // set the drag action based on the drop effect and effect allowed.
+ // The drop effect field on the drag transfer object specifies the
+ // desired current drop effect. However, it cannot be used if the
+ // effectAllowed state doesn't include that type of action. If the
+ // dropEffect is "none", then the action will be 'none' so a drop will
+ // not be allowed.
+ if (effectAllowed == nsIDragService::DRAGDROP_ACTION_UNINITIALIZED ||
+ dropEffect & effectAllowed)
+ action = dropEffect;
+
+ if (action == nsIDragService::DRAGDROP_ACTION_NONE)
+ dropEffect = nsIDragService::DRAGDROP_ACTION_NONE;
+
+ // inform the drag session that a drop is allowed on this node.
+ dragSession->SetDragAction(action);
+ dragSession->SetCanDrop(action != nsIDragService::DRAGDROP_ACTION_NONE);
+
+ // For now, do this only for dragover.
+ //XXXsmaug dragenter needs some more work.
+ if (aEvent->mMessage == eDragOver && !isChromeDoc) {
+ // Someone has called preventDefault(), check whether is was on
+ // content or chrome.
+ dragSession->SetOnlyChromeDrop(
+ !dragEvent->mDefaultPreventedOnContent);
+ }
+ } else if (aEvent->mMessage == eDragOver && !isChromeDoc) {
+ // No one called preventDefault(), so handle drop only in chrome.
+ dragSession->SetOnlyChromeDrop(true);
+ }
+ if (ContentChild* child = ContentChild::GetSingleton()) {
+ child->SendUpdateDropEffect(action, dropEffect);
+ }
+ if (dispatchedToContentProcess) {
+ dragSession->SetCanDrop(true);
+ } else if (initialDataTransfer) {
+ // Now set the drop effect in the initial dataTransfer. This ensures
+ // that we can get the desired drop effect in the drop event. For events
+ // dispatched to content, the content process will take care of setting
+ // this.
+ initialDataTransfer->SetDropEffectInt(dropEffect);
+ }
+ }
+ break;
+
+ case eDrop:
+ {
+ sLastDragOverFrame = nullptr;
+ ClearGlobalActiveContent(this);
+ break;
+ }
+ case eDragExit:
+ // make sure to fire the enter and exit_synth events after the
+ // eDragExit event, otherwise we'll clean up too early
+ GenerateDragDropEnterExit(presContext, aEvent->AsDragEvent());
+ break;
+
+ case eBeforeKeyUp:
+ case eKeyUp:
+ case eAfterKeyUp:
+ break;
+
+ case eKeyPress:
+ {
+ WidgetKeyboardEvent* keyEvent = aEvent->AsKeyboardEvent();
+ PostHandleKeyboardEvent(keyEvent, *aStatus, dispatchedToContentProcess);
+ }
+ break;
+
+ case eMouseEnterIntoWidget:
+ if (mCurrentTarget) {
+ nsCOMPtr<nsIContent> targetContent;
+ mCurrentTarget->GetContentForEvent(aEvent, getter_AddRefs(targetContent));
+ SetContentState(targetContent, NS_EVENT_STATE_HOVER);
+ }
+ break;
+
+#ifdef XP_MACOSX
+ case eMouseActivate:
+ if (mCurrentTarget) {
+ nsCOMPtr<nsIContent> targetContent;
+ mCurrentTarget->GetContentForEvent(aEvent, getter_AddRefs(targetContent));
+ if (!NodeAllowsClickThrough(targetContent)) {
+ *aStatus = nsEventStatus_eConsumeNoDefault;
+ }
+ }
+ break;
+#endif
+
+ default:
+ break;
+ }
+
+ //Reset target frame to null to avoid mistargeting after reentrant event
+ mCurrentTarget = nullptr;
+ mCurrentTargetContent = nullptr;
+
+ return ret;
+}
+
+TabParent*
+EventStateManager::GetCrossProcessTarget()
+{
+ return IMEStateManager::GetActiveTabParent();
+}
+
+bool
+EventStateManager::IsTargetCrossProcess(WidgetGUIEvent* aEvent)
+{
+ // Check to see if there is a focused, editable content in chrome,
+ // in that case, do not forward IME events to content
+ nsIContent *focusedContent = GetFocusedContent();
+ if (focusedContent && focusedContent->IsEditable())
+ return false;
+ return IMEStateManager::GetActiveTabParent() != nullptr;
+}
+
+void
+EventStateManager::NotifyDestroyPresContext(nsPresContext* aPresContext)
+{
+ IMEStateManager::OnDestroyPresContext(aPresContext);
+ if (mHoverContent) {
+ // Bug 70855: Presentation is going away, possibly for a reframe.
+ // Reset the hover state so that if we're recreating the presentation,
+ // we won't have the old hover state still set in the new presentation,
+ // as if the new presentation is resized, a new element may be hovered.
+ SetContentState(nullptr, NS_EVENT_STATE_HOVER);
+ }
+ mPointersEnterLeaveHelper.Clear();
+}
+
+void
+EventStateManager::SetPresContext(nsPresContext* aPresContext)
+{
+ mPresContext = aPresContext;
+}
+
+void
+EventStateManager::ClearFrameRefs(nsIFrame* aFrame)
+{
+ if (aFrame && aFrame == mCurrentTarget) {
+ mCurrentTargetContent = aFrame->GetContent();
+ }
+}
+
+void
+EventStateManager::UpdateCursor(nsPresContext* aPresContext,
+ WidgetEvent* aEvent,
+ nsIFrame* aTargetFrame,
+ nsEventStatus* aStatus)
+{
+ if (aTargetFrame && IsRemoteTarget(aTargetFrame->GetContent())) {
+ return;
+ }
+
+ int32_t cursor = NS_STYLE_CURSOR_DEFAULT;
+ imgIContainer* container = nullptr;
+ bool haveHotspot = false;
+ float hotspotX = 0.0f, hotspotY = 0.0f;
+
+ //If cursor is locked just use the locked one
+ if (mLockCursor) {
+ cursor = mLockCursor;
+ }
+ //If not locked, look for correct cursor
+ else if (aTargetFrame) {
+ nsIFrame::Cursor framecursor;
+ nsPoint pt = nsLayoutUtils::GetEventCoordinatesRelativeTo(aEvent,
+ aTargetFrame);
+ // Avoid setting cursor when the mouse is over a windowless pluign.
+ if (NS_FAILED(aTargetFrame->GetCursor(pt, framecursor))) {
+ if (XRE_IsContentProcess()) {
+ mLastFrameConsumedSetCursor = true;
+ }
+ return;
+ }
+ // Make sure cursors get reset after the mouse leaves a
+ // windowless plugin frame.
+ if (mLastFrameConsumedSetCursor) {
+ ClearCachedWidgetCursor(aTargetFrame);
+ mLastFrameConsumedSetCursor = false;
+ }
+ // If the current cursor is from the same frame, and it is now
+ // loading some new image for the cursor, we should wait for a
+ // while rather than taking its fallback cursor directly.
+ if (framecursor.mLoading &&
+ gLastCursorSourceFrame == aTargetFrame &&
+ TimeStamp::NowLoRes() - gLastCursorUpdateTime <
+ TimeDuration::FromMilliseconds(kCursorLoadingTimeout)) {
+ return;
+ }
+ cursor = framecursor.mCursor;
+ container = framecursor.mContainer;
+ haveHotspot = framecursor.mHaveHotspot;
+ hotspotX = framecursor.mHotspotX;
+ hotspotY = framecursor.mHotspotY;
+ }
+
+ if (nsContentUtils::UseActivityCursor()) {
+ // Check whether or not to show the busy cursor
+ nsCOMPtr<nsIDocShell> docShell(aPresContext->GetDocShell());
+ if (!docShell) return;
+ uint32_t busyFlags = nsIDocShell::BUSY_FLAGS_NONE;
+ docShell->GetBusyFlags(&busyFlags);
+
+ // Show busy cursor everywhere before page loads
+ // and just replace the arrow cursor after page starts loading
+ if (busyFlags & nsIDocShell::BUSY_FLAGS_BUSY &&
+ (cursor == NS_STYLE_CURSOR_AUTO || cursor == NS_STYLE_CURSOR_DEFAULT))
+ {
+ cursor = NS_STYLE_CURSOR_SPINNING;
+ container = nullptr;
+ }
+ }
+
+ if (aTargetFrame) {
+ SetCursor(cursor, container, haveHotspot, hotspotX, hotspotY,
+ aTargetFrame->GetNearestWidget(), false);
+ gLastCursorSourceFrame = aTargetFrame;
+ gLastCursorUpdateTime = TimeStamp::NowLoRes();
+ }
+
+ if (mLockCursor || NS_STYLE_CURSOR_AUTO != cursor) {
+ *aStatus = nsEventStatus_eConsumeDoDefault;
+ }
+}
+
+void
+EventStateManager::ClearCachedWidgetCursor(nsIFrame* aTargetFrame)
+{
+ if (!aTargetFrame) {
+ return;
+ }
+ nsIWidget* aWidget = aTargetFrame->GetNearestWidget();
+ if (!aWidget) {
+ return;
+ }
+ aWidget->ClearCachedCursor();
+}
+
+nsresult
+EventStateManager::SetCursor(int32_t aCursor, imgIContainer* aContainer,
+ bool aHaveHotspot,
+ float aHotspotX, float aHotspotY,
+ nsIWidget* aWidget, bool aLockCursor)
+{
+ EnsureDocument(mPresContext);
+ NS_ENSURE_TRUE(mDocument, NS_ERROR_FAILURE);
+ sMouseOverDocument = mDocument.get();
+
+ nsCursor c;
+
+ NS_ENSURE_TRUE(aWidget, NS_ERROR_FAILURE);
+ if (aLockCursor) {
+ if (NS_STYLE_CURSOR_AUTO != aCursor) {
+ mLockCursor = aCursor;
+ }
+ else {
+ //If cursor style is set to auto we unlock the cursor again.
+ mLockCursor = 0;
+ }
+ }
+ switch (aCursor) {
+ default:
+ case NS_STYLE_CURSOR_AUTO:
+ case NS_STYLE_CURSOR_DEFAULT:
+ c = eCursor_standard;
+ break;
+ case NS_STYLE_CURSOR_POINTER:
+ c = eCursor_hyperlink;
+ break;
+ case NS_STYLE_CURSOR_CROSSHAIR:
+ c = eCursor_crosshair;
+ break;
+ case NS_STYLE_CURSOR_MOVE:
+ c = eCursor_move;
+ break;
+ case NS_STYLE_CURSOR_TEXT:
+ c = eCursor_select;
+ break;
+ case NS_STYLE_CURSOR_WAIT:
+ c = eCursor_wait;
+ break;
+ case NS_STYLE_CURSOR_HELP:
+ c = eCursor_help;
+ break;
+ case NS_STYLE_CURSOR_N_RESIZE:
+ c = eCursor_n_resize;
+ break;
+ case NS_STYLE_CURSOR_S_RESIZE:
+ c = eCursor_s_resize;
+ break;
+ case NS_STYLE_CURSOR_W_RESIZE:
+ c = eCursor_w_resize;
+ break;
+ case NS_STYLE_CURSOR_E_RESIZE:
+ c = eCursor_e_resize;
+ break;
+ case NS_STYLE_CURSOR_NW_RESIZE:
+ c = eCursor_nw_resize;
+ break;
+ case NS_STYLE_CURSOR_SE_RESIZE:
+ c = eCursor_se_resize;
+ break;
+ case NS_STYLE_CURSOR_NE_RESIZE:
+ c = eCursor_ne_resize;
+ break;
+ case NS_STYLE_CURSOR_SW_RESIZE:
+ c = eCursor_sw_resize;
+ break;
+ case NS_STYLE_CURSOR_COPY: // CSS3
+ c = eCursor_copy;
+ break;
+ case NS_STYLE_CURSOR_ALIAS:
+ c = eCursor_alias;
+ break;
+ case NS_STYLE_CURSOR_CONTEXT_MENU:
+ c = eCursor_context_menu;
+ break;
+ case NS_STYLE_CURSOR_CELL:
+ c = eCursor_cell;
+ break;
+ case NS_STYLE_CURSOR_GRAB:
+ c = eCursor_grab;
+ break;
+ case NS_STYLE_CURSOR_GRABBING:
+ c = eCursor_grabbing;
+ break;
+ case NS_STYLE_CURSOR_SPINNING:
+ c = eCursor_spinning;
+ break;
+ case NS_STYLE_CURSOR_ZOOM_IN:
+ c = eCursor_zoom_in;
+ break;
+ case NS_STYLE_CURSOR_ZOOM_OUT:
+ c = eCursor_zoom_out;
+ break;
+ case NS_STYLE_CURSOR_NOT_ALLOWED:
+ c = eCursor_not_allowed;
+ break;
+ case NS_STYLE_CURSOR_COL_RESIZE:
+ c = eCursor_col_resize;
+ break;
+ case NS_STYLE_CURSOR_ROW_RESIZE:
+ c = eCursor_row_resize;
+ break;
+ case NS_STYLE_CURSOR_NO_DROP:
+ c = eCursor_no_drop;
+ break;
+ case NS_STYLE_CURSOR_VERTICAL_TEXT:
+ c = eCursor_vertical_text;
+ break;
+ case NS_STYLE_CURSOR_ALL_SCROLL:
+ c = eCursor_all_scroll;
+ break;
+ case NS_STYLE_CURSOR_NESW_RESIZE:
+ c = eCursor_nesw_resize;
+ break;
+ case NS_STYLE_CURSOR_NWSE_RESIZE:
+ c = eCursor_nwse_resize;
+ break;
+ case NS_STYLE_CURSOR_NS_RESIZE:
+ c = eCursor_ns_resize;
+ break;
+ case NS_STYLE_CURSOR_EW_RESIZE:
+ c = eCursor_ew_resize;
+ break;
+ case NS_STYLE_CURSOR_NONE:
+ c = eCursor_none;
+ break;
+ }
+
+ // First, try the imgIContainer, if non-null
+ nsresult rv = NS_ERROR_FAILURE;
+ if (aContainer) {
+ uint32_t hotspotX, hotspotY;
+
+ // css3-ui says to use the CSS-specified hotspot if present,
+ // otherwise use the intrinsic hotspot, otherwise use the top left
+ // corner.
+ if (aHaveHotspot) {
+ int32_t imgWidth, imgHeight;
+ aContainer->GetWidth(&imgWidth);
+ aContainer->GetHeight(&imgHeight);
+
+ // XXX std::max(NS_lround(x), 0)?
+ hotspotX = aHotspotX > 0.0f
+ ? uint32_t(aHotspotX + 0.5f) : uint32_t(0);
+ if (hotspotX >= uint32_t(imgWidth))
+ hotspotX = imgWidth - 1;
+ hotspotY = aHotspotY > 0.0f
+ ? uint32_t(aHotspotY + 0.5f) : uint32_t(0);
+ if (hotspotY >= uint32_t(imgHeight))
+ hotspotY = imgHeight - 1;
+ } else {
+ hotspotX = 0;
+ hotspotY = 0;
+ nsCOMPtr<nsIProperties> props(do_QueryInterface(aContainer));
+ if (props) {
+ nsCOMPtr<nsISupportsPRUint32> hotspotXWrap, hotspotYWrap;
+
+ props->Get("hotspotX", NS_GET_IID(nsISupportsPRUint32), getter_AddRefs(hotspotXWrap));
+ props->Get("hotspotY", NS_GET_IID(nsISupportsPRUint32), getter_AddRefs(hotspotYWrap));
+
+ if (hotspotXWrap)
+ hotspotXWrap->GetData(&hotspotX);
+ if (hotspotYWrap)
+ hotspotYWrap->GetData(&hotspotY);
+ }
+ }
+
+ rv = aWidget->SetCursor(aContainer, hotspotX, hotspotY);
+ }
+
+ if (NS_FAILED(rv))
+ aWidget->SetCursor(c);
+
+ return NS_OK;
+}
+
+class MOZ_STACK_CLASS ESMEventCB : public EventDispatchingCallback
+{
+public:
+ explicit ESMEventCB(nsIContent* aTarget) : mTarget(aTarget) {}
+
+ virtual void HandleEvent(EventChainPostVisitor& aVisitor)
+ {
+ if (aVisitor.mPresContext) {
+ nsIFrame* frame = aVisitor.mPresContext->GetPrimaryFrameFor(mTarget);
+ if (frame) {
+ frame->HandleEvent(aVisitor.mPresContext,
+ aVisitor.mEvent->AsGUIEvent(),
+ &aVisitor.mEventStatus);
+ }
+ }
+ }
+
+ nsCOMPtr<nsIContent> mTarget;
+};
+
+/*static*/ bool
+EventStateManager::IsHandlingUserInput()
+{
+ if (sUserInputEventDepth <= 0) {
+ return false;
+ }
+
+ TimeDuration timeout = nsContentUtils::HandlingUserInputTimeout();
+ return timeout <= TimeDuration(0) ||
+ (TimeStamp::Now() - sHandlingInputStart) <= timeout;
+}
+
+static void
+CreateMouseOrPointerWidgetEvent(WidgetMouseEvent* aMouseEvent,
+ EventMessage aMessage,
+ nsIContent* aRelatedContent,
+ nsAutoPtr<WidgetMouseEvent>& aNewEvent)
+{
+ WidgetPointerEvent* sourcePointer = aMouseEvent->AsPointerEvent();
+ if (sourcePointer) {
+ PROFILER_LABEL("Input", "DispatchPointerEvent",
+ js::ProfileEntry::Category::EVENTS);
+
+ nsAutoPtr<WidgetPointerEvent> newPointerEvent;
+ newPointerEvent =
+ new WidgetPointerEvent(aMouseEvent->IsTrusted(), aMessage,
+ aMouseEvent->mWidget);
+ newPointerEvent->mIsPrimary = sourcePointer->mIsPrimary;
+ newPointerEvent->mWidth = sourcePointer->mWidth;
+ newPointerEvent->mHeight = sourcePointer->mHeight;
+ newPointerEvent->inputSource = sourcePointer->inputSource;
+ newPointerEvent->relatedTarget =
+ nsIPresShell::GetPointerCapturingContent(sourcePointer->pointerId)
+ ? nullptr
+ : aRelatedContent;
+ aNewEvent = newPointerEvent.forget();
+ } else {
+ aNewEvent =
+ new WidgetMouseEvent(aMouseEvent->IsTrusted(), aMessage,
+ aMouseEvent->mWidget, WidgetMouseEvent::eReal);
+ aNewEvent->relatedTarget = aRelatedContent;
+ }
+ aNewEvent->mRefPoint = aMouseEvent->mRefPoint;
+ aNewEvent->mModifiers = aMouseEvent->mModifiers;
+ aNewEvent->button = aMouseEvent->button;
+ aNewEvent->buttons = aMouseEvent->buttons;
+ aNewEvent->pressure = aMouseEvent->pressure;
+ aNewEvent->mPluginEvent = aMouseEvent->mPluginEvent;
+ aNewEvent->inputSource = aMouseEvent->inputSource;
+ aNewEvent->pointerId = aMouseEvent->pointerId;
+}
+
+nsIFrame*
+EventStateManager::DispatchMouseOrPointerEvent(WidgetMouseEvent* aMouseEvent,
+ EventMessage aMessage,
+ nsIContent* aTargetContent,
+ nsIContent* aRelatedContent)
+{
+ // http://dvcs.w3.org/hg/webevents/raw-file/default/mouse-lock.html#methods
+ // "[When the mouse is locked on an element...e]vents that require the concept
+ // of a mouse cursor must not be dispatched (for example: mouseover, mouseout).
+ if (sIsPointerLocked &&
+ (aMessage == eMouseLeave ||
+ aMessage == eMouseEnter ||
+ aMessage == eMouseOver ||
+ aMessage == eMouseOut)) {
+ mCurrentTargetContent = nullptr;
+ nsCOMPtr<Element> pointerLockedElement =
+ do_QueryReferent(EventStateManager::sPointerLockedElement);
+ if (!pointerLockedElement) {
+ NS_WARNING("Should have pointer locked element, but didn't.");
+ return nullptr;
+ }
+ nsCOMPtr<nsIContent> content = do_QueryInterface(pointerLockedElement);
+ return mPresContext->GetPrimaryFrameFor(content);
+ }
+
+ mCurrentTargetContent = nullptr;
+
+ if (!aTargetContent) {
+ return nullptr;
+ }
+
+ nsCOMPtr<nsIContent> targetContent = aTargetContent;
+ nsCOMPtr<nsIContent> relatedContent = aRelatedContent;
+
+ nsAutoPtr<WidgetMouseEvent> dispatchEvent;
+ CreateMouseOrPointerWidgetEvent(aMouseEvent, aMessage,
+ relatedContent, dispatchEvent);
+
+ nsWeakFrame previousTarget = mCurrentTarget;
+ mCurrentTargetContent = targetContent;
+
+ nsIFrame* targetFrame = nullptr;
+
+ if (aMouseEvent->AsMouseEvent()) {
+ PROFILER_LABEL("Input", "DispatchMouseEvent",
+ js::ProfileEntry::Category::EVENTS);
+ }
+
+ nsEventStatus status = nsEventStatus_eIgnore;
+ ESMEventCB callback(targetContent);
+ EventDispatcher::Dispatch(targetContent, mPresContext, dispatchEvent, nullptr,
+ &status, &callback);
+
+ if (mPresContext) {
+ // Although the primary frame was checked in event callback, it may not be
+ // the same object after event dispatch and handling, so refetch it.
+ targetFrame = mPresContext->GetPrimaryFrameFor(targetContent);
+
+ // If we are entering/leaving remote content, dispatch a mouse enter/exit
+ // event to the remote frame.
+ if (IsRemoteTarget(targetContent)) {
+ if (aMessage == eMouseOut) {
+ // For remote content, send a "top-level" widget mouse exit event.
+ nsAutoPtr<WidgetMouseEvent> remoteEvent;
+ CreateMouseOrPointerWidgetEvent(aMouseEvent, eMouseExitFromWidget,
+ relatedContent, remoteEvent);
+ remoteEvent->mExitFrom = WidgetMouseEvent::eTopLevel;
+
+ // mCurrentTarget is set to the new target, so we must reset it to the
+ // old target and then dispatch a cross-process event. (mCurrentTarget
+ // will be set back below.) HandleCrossProcessEvent will query for the
+ // proper target via GetEventTarget which will return mCurrentTarget.
+ mCurrentTarget = targetFrame;
+ HandleCrossProcessEvent(remoteEvent, &status);
+ } else if (aMessage == eMouseOver) {
+ nsAutoPtr<WidgetMouseEvent> remoteEvent;
+ CreateMouseOrPointerWidgetEvent(aMouseEvent, eMouseEnterIntoWidget,
+ relatedContent, remoteEvent);
+ HandleCrossProcessEvent(remoteEvent, &status);
+ }
+ }
+ }
+
+ mCurrentTargetContent = nullptr;
+ mCurrentTarget = previousTarget;
+
+ return targetFrame;
+}
+
+class EnterLeaveDispatcher
+{
+public:
+ EnterLeaveDispatcher(EventStateManager* aESM,
+ nsIContent* aTarget, nsIContent* aRelatedTarget,
+ WidgetMouseEvent* aMouseEvent,
+ EventMessage aEventMessage)
+ : mESM(aESM)
+ , mMouseEvent(aMouseEvent)
+ , mEventMessage(aEventMessage)
+ {
+ nsPIDOMWindowInner* win =
+ aTarget ? aTarget->OwnerDoc()->GetInnerWindow() : nullptr;
+ if (aMouseEvent->AsPointerEvent() ? win && win->HasPointerEnterLeaveEventListeners() :
+ win && win->HasMouseEnterLeaveEventListeners()) {
+ mRelatedTarget = aRelatedTarget ?
+ aRelatedTarget->FindFirstNonChromeOnlyAccessContent() : nullptr;
+ nsINode* commonParent = nullptr;
+ if (aTarget && aRelatedTarget) {
+ commonParent =
+ nsContentUtils::GetCommonAncestor(aTarget, aRelatedTarget);
+ }
+ nsIContent* current = aTarget;
+ // Note, it is ok if commonParent is null!
+ while (current && current != commonParent) {
+ if (!current->ChromeOnlyAccess()) {
+ mTargets.AppendObject(current);
+ }
+ // mouseenter/leave is fired only on elements.
+ current = current->GetParent();
+ }
+ }
+ }
+
+ ~EnterLeaveDispatcher()
+ {
+ if (mEventMessage == eMouseEnter || mEventMessage == ePointerEnter) {
+ for (int32_t i = mTargets.Count() - 1; i >= 0; --i) {
+ mESM->DispatchMouseOrPointerEvent(mMouseEvent, mEventMessage,
+ mTargets[i], mRelatedTarget);
+ }
+ } else {
+ for (int32_t i = 0; i < mTargets.Count(); ++i) {
+ mESM->DispatchMouseOrPointerEvent(mMouseEvent, mEventMessage,
+ mTargets[i], mRelatedTarget);
+ }
+ }
+ }
+
+ EventStateManager* mESM;
+ nsCOMArray<nsIContent> mTargets;
+ nsCOMPtr<nsIContent> mRelatedTarget;
+ WidgetMouseEvent* mMouseEvent;
+ EventMessage mEventMessage;
+};
+
+void
+EventStateManager::NotifyMouseOut(WidgetMouseEvent* aMouseEvent,
+ nsIContent* aMovingInto)
+{
+ OverOutElementsWrapper* wrapper = GetWrapperByEventID(aMouseEvent);
+
+ if (!wrapper->mLastOverElement)
+ return;
+ // Before firing mouseout, check for recursion
+ if (wrapper->mLastOverElement == wrapper->mFirstOutEventElement)
+ return;
+
+ if (wrapper->mLastOverFrame) {
+ // if the frame is associated with a subdocument,
+ // tell the subdocument that we're moving out of it
+ nsSubDocumentFrame* subdocFrame = do_QueryFrame(wrapper->mLastOverFrame.GetFrame());
+ if (subdocFrame) {
+ nsCOMPtr<nsIDocShell> docshell;
+ subdocFrame->GetDocShell(getter_AddRefs(docshell));
+ if (docshell) {
+ RefPtr<nsPresContext> presContext;
+ docshell->GetPresContext(getter_AddRefs(presContext));
+
+ if (presContext) {
+ EventStateManager* kidESM = presContext->EventStateManager();
+ // Not moving into any element in this subdocument
+ kidESM->NotifyMouseOut(aMouseEvent, nullptr);
+ }
+ }
+ }
+ }
+ // That could have caused DOM events which could wreak havoc. Reverify
+ // things and be careful.
+ if (!wrapper->mLastOverElement)
+ return;
+
+ // Store the first mouseOut event we fire and don't refire mouseOut
+ // to that element while the first mouseOut is still ongoing.
+ wrapper->mFirstOutEventElement = wrapper->mLastOverElement;
+
+ // Don't touch hover state if aMovingInto is non-null. Caller will update
+ // hover state itself, and we have optimizations for hover switching between
+ // two nearby elements both deep in the DOM tree that would be defeated by
+ // switching the hover state to null here.
+ bool isPointer = aMouseEvent->mClass == ePointerEventClass;
+ if (!aMovingInto && !isPointer) {
+ // Unset :hover
+ SetContentState(nullptr, NS_EVENT_STATE_HOVER);
+ }
+
+ // In case we go out from capturing element (retargetedByPointerCapture is true)
+ // we should dispatch ePointerLeave event and only for capturing element.
+ RefPtr<nsIContent> movingInto = aMouseEvent->retargetedByPointerCapture
+ ? wrapper->mLastOverElement->GetParent()
+ : aMovingInto;
+
+ EnterLeaveDispatcher leaveDispatcher(this, wrapper->mLastOverElement,
+ movingInto, aMouseEvent,
+ isPointer ? ePointerLeave : eMouseLeave);
+
+ // Fire mouseout
+ DispatchMouseOrPointerEvent(aMouseEvent, isPointer ? ePointerOut : eMouseOut,
+ wrapper->mLastOverElement, aMovingInto);
+
+ wrapper->mLastOverFrame = nullptr;
+ wrapper->mLastOverElement = nullptr;
+
+ // Turn recursion protection back off
+ wrapper->mFirstOutEventElement = nullptr;
+}
+
+void
+EventStateManager::NotifyMouseOver(WidgetMouseEvent* aMouseEvent,
+ nsIContent* aContent)
+{
+ NS_ASSERTION(aContent, "Mouse must be over something");
+
+ // If pointer capture is set, we should suppress pointerover/pointerenter events
+ // for all elements except element which have pointer capture.
+ bool dispatch = !aMouseEvent->retargetedByPointerCapture;
+
+ OverOutElementsWrapper* wrapper = GetWrapperByEventID(aMouseEvent);
+
+ if (wrapper->mLastOverElement == aContent && dispatch)
+ return;
+
+ // Before firing mouseover, check for recursion
+ if (aContent == wrapper->mFirstOverEventElement)
+ return;
+
+ // Check to see if we're a subdocument and if so update the parent
+ // document's ESM state to indicate that the mouse is over the
+ // content associated with our subdocument.
+ EnsureDocument(mPresContext);
+ if (nsIDocument *parentDoc = mDocument->GetParentDocument()) {
+ if (nsIContent *docContent = parentDoc->FindContentForSubDocument(mDocument)) {
+ if (nsIPresShell *parentShell = parentDoc->GetShell()) {
+ EventStateManager* parentESM =
+ parentShell->GetPresContext()->EventStateManager();
+ parentESM->NotifyMouseOver(aMouseEvent, docContent);
+ }
+ }
+ }
+ // Firing the DOM event in the parent document could cause all kinds
+ // of havoc. Reverify and take care.
+ if (wrapper->mLastOverElement == aContent && dispatch)
+ return;
+
+ // Remember mLastOverElement as the related content for the
+ // DispatchMouseOrPointerEvent() call below, since NotifyMouseOut() resets it, bug 298477.
+ nsCOMPtr<nsIContent> lastOverElement = wrapper->mLastOverElement;
+
+ bool isPointer = aMouseEvent->mClass == ePointerEventClass;
+
+ Maybe<EnterLeaveDispatcher> enterDispatcher;
+ if (dispatch) {
+ enterDispatcher.emplace(this, aContent, lastOverElement, aMouseEvent,
+ isPointer ? ePointerEnter : eMouseEnter);
+ }
+
+ NotifyMouseOut(aMouseEvent, aContent);
+
+ // Store the first mouseOver event we fire and don't refire mouseOver
+ // to that element while the first mouseOver is still ongoing.
+ wrapper->mFirstOverEventElement = aContent;
+
+ if (!isPointer) {
+ SetContentState(aContent, NS_EVENT_STATE_HOVER);
+ }
+
+ if (dispatch) {
+ // Fire mouseover
+ wrapper->mLastOverFrame =
+ DispatchMouseOrPointerEvent(aMouseEvent,
+ isPointer ? ePointerOver : eMouseOver,
+ aContent, lastOverElement);
+ wrapper->mLastOverElement = aContent;
+ } else {
+ wrapper->mLastOverFrame = nullptr;
+ wrapper->mLastOverElement = nullptr;
+ }
+
+ // Turn recursion protection back off
+ wrapper->mFirstOverEventElement = nullptr;
+}
+
+// Returns the center point of the window's client area. This is
+// in widget coordinates, i.e. relative to the widget's top-left
+// corner, not in screen coordinates, the same units that UIEvent::
+// refpoint is in. It may not be the exact center of the window if
+// the platform requires rounding the coordinate.
+static LayoutDeviceIntPoint
+GetWindowClientRectCenter(nsIWidget* aWidget)
+{
+ NS_ENSURE_TRUE(aWidget, LayoutDeviceIntPoint(0, 0));
+
+ LayoutDeviceIntRect rect = aWidget->GetClientBounds();
+ LayoutDeviceIntPoint point(rect.x + rect.width / 2,
+ rect.y + rect.height / 2);
+ int32_t round = aWidget->RoundsWidgetCoordinatesTo();
+ point.x = point.x / round * round;
+ point.y = point.y / round * round;
+ return point - aWidget->WidgetToScreenOffset();
+}
+
+void
+EventStateManager::GeneratePointerEnterExit(EventMessage aMessage,
+ WidgetMouseEvent* aEvent)
+{
+ WidgetPointerEvent pointerEvent(*aEvent);
+ pointerEvent.mMessage = aMessage;
+ GenerateMouseEnterExit(&pointerEvent);
+}
+
+void
+EventStateManager::GenerateMouseEnterExit(WidgetMouseEvent* aMouseEvent)
+{
+ EnsureDocument(mPresContext);
+ if (!mDocument)
+ return;
+
+ // Hold onto old target content through the event and reset after.
+ nsCOMPtr<nsIContent> targetBeforeEvent = mCurrentTargetContent;
+
+ switch(aMouseEvent->mMessage) {
+ case eMouseMove:
+ {
+ // Mouse movement is reported on the MouseEvent.movement{X,Y} fields.
+ // Movement is calculated in UIEvent::GetMovementPoint() as:
+ // previous_mousemove_mRefPoint - current_mousemove_mRefPoint.
+ if (sIsPointerLocked && aMouseEvent->mWidget) {
+ // The pointer is locked. If the pointer is not located at the center of
+ // the window, dispatch a synthetic mousemove to return the pointer there.
+ // Doing this between "real" pointer moves gives the impression that the
+ // (locked) pointer can continue moving and won't stop at the screen
+ // boundary. We cancel the synthetic event so that we don't end up
+ // dispatching the centering move event to content.
+ LayoutDeviceIntPoint center =
+ GetWindowClientRectCenter(aMouseEvent->mWidget);
+ aMouseEvent->mLastRefPoint = center;
+ if (aMouseEvent->mRefPoint != center) {
+ // Mouse move doesn't finish at the center of the window. Dispatch a
+ // synthetic native mouse event to move the pointer back to the center
+ // of the window, to faciliate more movement. But first, record that
+ // we've dispatched a synthetic mouse movement, so we can cancel it
+ // in the other branch here.
+ sSynthCenteringPoint = center;
+ aMouseEvent->mWidget->SynthesizeNativeMouseMove(
+ center + aMouseEvent->mWidget->WidgetToScreenOffset(), nullptr);
+ } else if (aMouseEvent->mRefPoint == sSynthCenteringPoint) {
+ // This is the "synthetic native" event we dispatched to re-center the
+ // pointer. Cancel it so we don't expose the centering move to content.
+ aMouseEvent->StopPropagation();
+ // Clear sSynthCenteringPoint so we don't cancel other events
+ // targeted at the center.
+ sSynthCenteringPoint = kInvalidRefPoint;
+ }
+ } else if (sLastRefPoint == kInvalidRefPoint) {
+ // We don't have a valid previous mousemove mRefPoint. This is either
+ // the first move we've encountered, or the mouse has just re-entered
+ // the application window. We should report (0,0) movement for this
+ // case, so make the current and previous mRefPoints the same.
+ aMouseEvent->mLastRefPoint = aMouseEvent->mRefPoint;
+ } else {
+ aMouseEvent->mLastRefPoint = sLastRefPoint;
+ }
+
+ // Update the last known mRefPoint with the current mRefPoint.
+ sLastRefPoint = aMouseEvent->mRefPoint;
+ }
+ MOZ_FALLTHROUGH;
+ case ePointerMove:
+ case ePointerDown:
+ {
+ // Get the target content target (mousemove target == mouseover target)
+ nsCOMPtr<nsIContent> targetElement = GetEventTargetContent(aMouseEvent);
+ if (!targetElement) {
+ // We're always over the document root, even if we're only
+ // over dead space in a page (whose frame is not associated with
+ // any content) or in print preview dead space
+ targetElement = mDocument->GetRootElement();
+ }
+ if (targetElement) {
+ NotifyMouseOver(aMouseEvent, targetElement);
+ }
+ }
+ break;
+ case ePointerUp:
+ {
+ // Get the target content target (mousemove target == mouseover target)
+ nsCOMPtr<nsIContent> targetElement = GetEventTargetContent(aMouseEvent);
+ if (!targetElement) {
+ // We're always over the document root, even if we're only
+ // over dead space in a page (whose frame is not associated with
+ // any content) or in print preview dead space
+ targetElement = mDocument->GetRootElement();
+ }
+ if (targetElement) {
+ OverOutElementsWrapper* helper = GetWrapperByEventID(aMouseEvent);
+ if (helper) {
+ helper->mLastOverElement = targetElement;
+ }
+ NotifyMouseOut(aMouseEvent, nullptr);
+ }
+ }
+ break;
+ case ePointerLeave:
+ case ePointerCancel:
+ case eMouseExitFromWidget:
+ {
+ // This is actually the window mouse exit or pointer leave event. We're not moving
+ // into any new element.
+
+ OverOutElementsWrapper* helper = GetWrapperByEventID(aMouseEvent);
+ if (helper->mLastOverFrame &&
+ nsContentUtils::GetTopLevelWidget(aMouseEvent->mWidget) !=
+ nsContentUtils::GetTopLevelWidget(helper->mLastOverFrame->GetNearestWidget())) {
+ // the Mouse/PointerOut event widget doesn't have same top widget with
+ // mLastOverFrame, it's a spurious event for mLastOverFrame
+ break;
+ }
+
+ // Reset sLastRefPoint, so that we'll know not to report any
+ // movement the next time we re-enter the window.
+ sLastRefPoint = kInvalidRefPoint;
+
+ NotifyMouseOut(aMouseEvent, nullptr);
+ }
+ break;
+ default:
+ break;
+ }
+
+ // reset mCurretTargetContent to what it was
+ mCurrentTargetContent = targetBeforeEvent;
+}
+
+OverOutElementsWrapper*
+EventStateManager::GetWrapperByEventID(WidgetMouseEvent* aEvent)
+{
+ WidgetPointerEvent* pointer = aEvent->AsPointerEvent();
+ if (!pointer) {
+ MOZ_ASSERT(aEvent->AsMouseEvent() != nullptr);
+ if (!mMouseEnterLeaveHelper) {
+ mMouseEnterLeaveHelper = new OverOutElementsWrapper();
+ }
+ return mMouseEnterLeaveHelper;
+ }
+ RefPtr<OverOutElementsWrapper> helper;
+ if (!mPointersEnterLeaveHelper.Get(pointer->pointerId, getter_AddRefs(helper))) {
+ helper = new OverOutElementsWrapper();
+ mPointersEnterLeaveHelper.Put(pointer->pointerId, helper);
+ }
+
+ return helper;
+}
+
+/* static */ void
+EventStateManager::SetPointerLock(nsIWidget* aWidget,
+ nsIContent* aElement)
+{
+ // NOTE: aElement will be nullptr when unlocking.
+ sIsPointerLocked = !!aElement;
+
+ // Reset mouse wheel transaction
+ WheelTransaction::EndTransaction();
+
+ // Deal with DnD events
+ nsCOMPtr<nsIDragService> dragService =
+ do_GetService("@mozilla.org/widget/dragservice;1");
+
+ if (sIsPointerLocked) {
+ MOZ_ASSERT(aWidget, "Locking pointer requires a widget");
+
+ // Store the last known ref point so we can reposition the pointer after unlock.
+ sPreLockPoint = sLastRefPoint;
+
+ // Fire a synthetic mouse move to ensure event state is updated. We first
+ // set the mouse to the center of the window, so that the mouse event
+ // doesn't report any movement.
+ sLastRefPoint = GetWindowClientRectCenter(aWidget);
+ aWidget->SynthesizeNativeMouseMove(
+ sLastRefPoint + aWidget->WidgetToScreenOffset(), nullptr);
+
+ // Suppress DnD
+ if (dragService) {
+ dragService->Suppress();
+ }
+ } else {
+ // Unlocking, so return pointer to the original position by firing a
+ // synthetic mouse event. We first reset sLastRefPoint to its
+ // pre-pointerlock position, so that the synthetic mouse event reports
+ // no movement.
+ sLastRefPoint = sPreLockPoint;
+ // Reset SynthCenteringPoint to invalid so that next time we start
+ // locking pointer, it has its initial value.
+ sSynthCenteringPoint = kInvalidRefPoint;
+ if (aWidget) {
+ aWidget->SynthesizeNativeMouseMove(
+ sPreLockPoint + aWidget->WidgetToScreenOffset(), nullptr);
+ }
+
+ // Unsuppress DnD
+ if (dragService) {
+ dragService->Unsuppress();
+ }
+ }
+}
+
+void
+EventStateManager::GenerateDragDropEnterExit(nsPresContext* aPresContext,
+ WidgetDragEvent* aDragEvent)
+{
+ //Hold onto old target content through the event and reset after.
+ nsCOMPtr<nsIContent> targetBeforeEvent = mCurrentTargetContent;
+
+ switch(aDragEvent->mMessage) {
+ case eDragOver:
+ {
+ // when dragging from one frame to another, events are fired in the
+ // order: dragexit, dragenter, dragleave
+ if (sLastDragOverFrame != mCurrentTarget) {
+ //We'll need the content, too, to check if it changed separately from the frames.
+ nsCOMPtr<nsIContent> lastContent;
+ nsCOMPtr<nsIContent> targetContent;
+ mCurrentTarget->GetContentForEvent(aDragEvent,
+ getter_AddRefs(targetContent));
+
+ if (sLastDragOverFrame) {
+ //The frame has changed but the content may not have. Check before dispatching to content
+ sLastDragOverFrame->GetContentForEvent(aDragEvent,
+ getter_AddRefs(lastContent));
+
+ FireDragEnterOrExit(sLastDragOverFrame->PresContext(),
+ aDragEvent, eDragExit,
+ targetContent, lastContent, sLastDragOverFrame);
+ }
+
+ FireDragEnterOrExit(aPresContext, aDragEvent, eDragEnter,
+ lastContent, targetContent, mCurrentTarget);
+
+ if (sLastDragOverFrame) {
+ FireDragEnterOrExit(sLastDragOverFrame->PresContext(),
+ aDragEvent, eDragLeave,
+ targetContent, lastContent, sLastDragOverFrame);
+ }
+
+ sLastDragOverFrame = mCurrentTarget;
+ }
+ }
+ break;
+
+ case eDragExit:
+ {
+ //This is actually the window mouse exit event.
+ if (sLastDragOverFrame) {
+ nsCOMPtr<nsIContent> lastContent;
+ sLastDragOverFrame->GetContentForEvent(aDragEvent,
+ getter_AddRefs(lastContent));
+
+ RefPtr<nsPresContext> lastDragOverFramePresContext = sLastDragOverFrame->PresContext();
+ FireDragEnterOrExit(lastDragOverFramePresContext,
+ aDragEvent, eDragExit,
+ nullptr, lastContent, sLastDragOverFrame);
+ FireDragEnterOrExit(lastDragOverFramePresContext,
+ aDragEvent, eDragLeave,
+ nullptr, lastContent, sLastDragOverFrame);
+
+ sLastDragOverFrame = nullptr;
+ }
+ }
+ break;
+
+ default:
+ break;
+ }
+
+ //reset mCurretTargetContent to what it was
+ mCurrentTargetContent = targetBeforeEvent;
+
+ // Now flush all pending notifications, for better responsiveness.
+ FlushPendingEvents(aPresContext);
+}
+
+void
+EventStateManager::FireDragEnterOrExit(nsPresContext* aPresContext,
+ WidgetDragEvent* aDragEvent,
+ EventMessage aMessage,
+ nsIContent* aRelatedTarget,
+ nsIContent* aTargetContent,
+ nsWeakFrame& aTargetFrame)
+{
+ nsEventStatus status = nsEventStatus_eIgnore;
+ WidgetDragEvent event(aDragEvent->IsTrusted(), aMessage, aDragEvent->mWidget);
+ event.mRefPoint = aDragEvent->mRefPoint;
+ event.mModifiers = aDragEvent->mModifiers;
+ event.buttons = aDragEvent->buttons;
+ event.relatedTarget = aRelatedTarget;
+ event.inputSource = aDragEvent->inputSource;
+
+ mCurrentTargetContent = aTargetContent;
+
+ if (aTargetContent != aRelatedTarget) {
+ //XXX This event should still go somewhere!!
+ if (aTargetContent) {
+ EventDispatcher::Dispatch(aTargetContent, aPresContext, &event,
+ nullptr, &status);
+ }
+
+ // adjust the drag hover if the dragenter event was cancelled or this is a drag exit
+ if (status == nsEventStatus_eConsumeNoDefault || aMessage == eDragExit) {
+ SetContentState((aMessage == eDragEnter) ? aTargetContent : nullptr,
+ NS_EVENT_STATE_DRAGOVER);
+ }
+
+ // collect any changes to moz cursor settings stored in the event's
+ // data transfer.
+ if (aMessage == eDragLeave || aMessage == eDragExit ||
+ aMessage == eDragEnter) {
+ UpdateDragDataTransfer(&event);
+ }
+ }
+
+ // Finally dispatch the event to the frame
+ if (aTargetFrame)
+ aTargetFrame->HandleEvent(aPresContext, &event, &status);
+}
+
+void
+EventStateManager::UpdateDragDataTransfer(WidgetDragEvent* dragEvent)
+{
+ NS_ASSERTION(dragEvent, "drag event is null in UpdateDragDataTransfer!");
+ if (!dragEvent->mDataTransfer) {
+ return;
+ }
+
+ nsCOMPtr<nsIDragSession> dragSession = nsContentUtils::GetDragSession();
+
+ if (dragSession) {
+ // the initial dataTransfer is the one from the dragstart event that
+ // was set on the dragSession when the drag began.
+ nsCOMPtr<nsIDOMDataTransfer> initialDataTransfer;
+ dragSession->GetDataTransfer(getter_AddRefs(initialDataTransfer));
+ if (initialDataTransfer) {
+ // retrieve the current moz cursor setting and save it.
+ nsAutoString mozCursor;
+ dragEvent->mDataTransfer->GetMozCursor(mozCursor);
+ initialDataTransfer->SetMozCursor(mozCursor);
+ }
+ }
+}
+
+nsresult
+EventStateManager::SetClickCount(WidgetMouseEvent* aEvent,
+ nsEventStatus* aStatus)
+{
+ nsCOMPtr<nsIContent> mouseContent;
+ nsIContent* mouseContentParent = nullptr;
+ if (mCurrentTarget) {
+ mCurrentTarget->GetContentForEvent(aEvent, getter_AddRefs(mouseContent));
+ }
+ if (mouseContent) {
+ if (mouseContent->IsNodeOfType(nsINode::eTEXT)) {
+ mouseContent = mouseContent->GetParent();
+ }
+ if (mouseContent && mouseContent->IsRootOfNativeAnonymousSubtree()) {
+ mouseContentParent = mouseContent->GetParent();
+ }
+ }
+
+ switch (aEvent->button) {
+ case WidgetMouseEvent::eLeftButton:
+ if (aEvent->mMessage == eMouseDown) {
+ mLastLeftMouseDownContent = mouseContent;
+ mLastLeftMouseDownContentParent = mouseContentParent;
+ } else if (aEvent->mMessage == eMouseUp) {
+ if (mLastLeftMouseDownContent == mouseContent ||
+ mLastLeftMouseDownContentParent == mouseContent ||
+ mLastLeftMouseDownContent == mouseContentParent) {
+ aEvent->mClickCount = mLClickCount;
+ mLClickCount = 0;
+ } else {
+ aEvent->mClickCount = 0;
+ }
+ mLastLeftMouseDownContent = nullptr;
+ mLastLeftMouseDownContentParent = nullptr;
+ }
+ break;
+
+ case WidgetMouseEvent::eMiddleButton:
+ if (aEvent->mMessage == eMouseDown) {
+ mLastMiddleMouseDownContent = mouseContent;
+ mLastMiddleMouseDownContentParent = mouseContentParent;
+ } else if (aEvent->mMessage == eMouseUp) {
+ if (mLastMiddleMouseDownContent == mouseContent ||
+ mLastMiddleMouseDownContentParent == mouseContent ||
+ mLastMiddleMouseDownContent == mouseContentParent) {
+ aEvent->mClickCount = mMClickCount;
+ mMClickCount = 0;
+ } else {
+ aEvent->mClickCount = 0;
+ }
+ mLastMiddleMouseDownContent = nullptr;
+ mLastMiddleMouseDownContentParent = nullptr;
+ }
+ break;
+
+ case WidgetMouseEvent::eRightButton:
+ if (aEvent->mMessage == eMouseDown) {
+ mLastRightMouseDownContent = mouseContent;
+ mLastRightMouseDownContentParent = mouseContentParent;
+ } else if (aEvent->mMessage == eMouseUp) {
+ if (mLastRightMouseDownContent == mouseContent ||
+ mLastRightMouseDownContentParent == mouseContent ||
+ mLastRightMouseDownContent == mouseContentParent) {
+ aEvent->mClickCount = mRClickCount;
+ mRClickCount = 0;
+ } else {
+ aEvent->mClickCount = 0;
+ }
+ mLastRightMouseDownContent = nullptr;
+ mLastRightMouseDownContentParent = nullptr;
+ }
+ break;
+ }
+
+ return NS_OK;
+}
+
+nsresult
+EventStateManager::CheckForAndDispatchClick(WidgetMouseEvent* aEvent,
+ nsEventStatus* aStatus)
+{
+ nsresult ret = NS_OK;
+
+ //If mouse is still over same element, clickcount will be > 1.
+ //If it has moved it will be zero, so no click.
+ if (aEvent->mClickCount) {
+ //Check that the window isn't disabled before firing a click
+ //(see bug 366544).
+ if (aEvent->mWidget && !aEvent->mWidget->IsEnabled()) {
+ return ret;
+ }
+ //fire click
+ bool notDispatchToContents =
+ (aEvent->button == WidgetMouseEvent::eMiddleButton ||
+ aEvent->button == WidgetMouseEvent::eRightButton);
+
+ WidgetMouseEvent event(aEvent->IsTrusted(), eMouseClick,
+ aEvent->mWidget, WidgetMouseEvent::eReal);
+ event.mRefPoint = aEvent->mRefPoint;
+ event.mClickCount = aEvent->mClickCount;
+ event.mModifiers = aEvent->mModifiers;
+ event.buttons = aEvent->buttons;
+ event.mTime = aEvent->mTime;
+ event.mTimeStamp = aEvent->mTimeStamp;
+ event.mFlags.mNoContentDispatch = notDispatchToContents;
+ event.button = aEvent->button;
+ event.inputSource = aEvent->inputSource;
+
+ nsCOMPtr<nsIPresShell> presShell = mPresContext->GetPresShell();
+ if (presShell) {
+ nsCOMPtr<nsIContent> mouseContent = GetEventTargetContent(aEvent);
+ // Click events apply to *elements* not nodes. At this point the target
+ // content may have been reset to some non-element content, and so we need
+ // to walk up the closest ancestor element, just like we do in
+ // nsPresShell::HandlePositionedEvent.
+ while (mouseContent && !mouseContent->IsElement()) {
+ mouseContent = mouseContent->GetParent();
+ }
+
+ if (!mouseContent && !mCurrentTarget) {
+ return NS_OK;
+ }
+
+ // HandleEvent clears out mCurrentTarget which we might need again
+ nsWeakFrame currentTarget = mCurrentTarget;
+ ret = presShell->HandleEventWithTarget(&event, currentTarget,
+ mouseContent, aStatus);
+ if (NS_SUCCEEDED(ret) && aEvent->mClickCount == 2 &&
+ mouseContent && mouseContent->IsInComposedDoc()) {
+ //fire double click
+ WidgetMouseEvent event2(aEvent->IsTrusted(), eMouseDoubleClick,
+ aEvent->mWidget, WidgetMouseEvent::eReal);
+ event2.mRefPoint = aEvent->mRefPoint;
+ event2.mClickCount = aEvent->mClickCount;
+ event2.mModifiers = aEvent->mModifiers;
+ event2.buttons = aEvent->buttons;
+ event2.mFlags.mNoContentDispatch = notDispatchToContents;
+ event2.button = aEvent->button;
+ event2.inputSource = aEvent->inputSource;
+
+ ret = presShell->HandleEventWithTarget(&event2, currentTarget,
+ mouseContent, aStatus);
+ }
+ }
+ }
+ return ret;
+}
+
+nsIFrame*
+EventStateManager::GetEventTarget()
+{
+ nsIPresShell *shell;
+ if (mCurrentTarget ||
+ !mPresContext ||
+ !(shell = mPresContext->GetPresShell())) {
+ return mCurrentTarget;
+ }
+
+ if (mCurrentTargetContent) {
+ mCurrentTarget = mPresContext->GetPrimaryFrameFor(mCurrentTargetContent);
+ if (mCurrentTarget) {
+ return mCurrentTarget;
+ }
+ }
+
+ nsIFrame* frame = shell->GetEventTargetFrame();
+ return (mCurrentTarget = frame);
+}
+
+already_AddRefed<nsIContent>
+EventStateManager::GetEventTargetContent(WidgetEvent* aEvent)
+{
+ if (aEvent &&
+ (aEvent->mMessage == eFocus || aEvent->mMessage == eBlur)) {
+ nsCOMPtr<nsIContent> content = GetFocusedContent();
+ return content.forget();
+ }
+
+ if (mCurrentTargetContent) {
+ nsCOMPtr<nsIContent> content = mCurrentTargetContent;
+ return content.forget();
+ }
+
+ nsCOMPtr<nsIContent> content;
+
+ nsIPresShell *presShell = mPresContext->GetPresShell();
+ if (presShell) {
+ content = presShell->GetEventTargetContent(aEvent);
+ }
+
+ // Some events here may set mCurrentTarget but not set the corresponding
+ // event target in the PresShell.
+ if (!content && mCurrentTarget) {
+ mCurrentTarget->GetContentForEvent(aEvent, getter_AddRefs(content));
+ }
+
+ return content.forget();
+}
+
+static Element*
+GetLabelTarget(nsIContent* aPossibleLabel)
+{
+ mozilla::dom::HTMLLabelElement* label =
+ mozilla::dom::HTMLLabelElement::FromContent(aPossibleLabel);
+ if (!label)
+ return nullptr;
+
+ return label->GetLabeledElement();
+}
+
+static nsIContent* FindCommonAncestor(nsIContent *aNode1, nsIContent *aNode2)
+{
+ // Find closest common ancestor
+ if (aNode1 && aNode2) {
+ // Find the nearest common ancestor by counting the distance to the
+ // root and then walking up again, in pairs.
+ int32_t offset = 0;
+ nsIContent *anc1 = aNode1;
+ for (;;) {
+ ++offset;
+ nsIContent* parent = anc1->GetFlattenedTreeParent();
+ if (!parent)
+ break;
+ anc1 = parent;
+ }
+ nsIContent *anc2 = aNode2;
+ for (;;) {
+ --offset;
+ nsIContent* parent = anc2->GetFlattenedTreeParent();
+ if (!parent)
+ break;
+ anc2 = parent;
+ }
+ if (anc1 == anc2) {
+ anc1 = aNode1;
+ anc2 = aNode2;
+ while (offset > 0) {
+ anc1 = anc1->GetFlattenedTreeParent();
+ --offset;
+ }
+ while (offset < 0) {
+ anc2 = anc2->GetFlattenedTreeParent();
+ ++offset;
+ }
+ while (anc1 != anc2) {
+ anc1 = anc1->GetFlattenedTreeParent();
+ anc2 = anc2->GetFlattenedTreeParent();
+ }
+ return anc1;
+ }
+ }
+ return nullptr;
+}
+
+/* static */
+void
+EventStateManager::SetFullScreenState(Element* aElement, bool aIsFullScreen)
+{
+ DoStateChange(aElement, NS_EVENT_STATE_FULL_SCREEN, aIsFullScreen);
+}
+
+/* static */
+inline void
+EventStateManager::DoStateChange(Element* aElement, EventStates aState,
+ bool aAddState)
+{
+ if (aAddState) {
+ aElement->AddStates(aState);
+ } else {
+ aElement->RemoveStates(aState);
+ }
+}
+
+/* static */
+inline void
+EventStateManager::DoStateChange(nsIContent* aContent, EventStates aState,
+ bool aStateAdded)
+{
+ if (aContent->IsElement()) {
+ DoStateChange(aContent->AsElement(), aState, aStateAdded);
+ }
+}
+
+/* static */
+void
+EventStateManager::UpdateAncestorState(nsIContent* aStartNode,
+ nsIContent* aStopBefore,
+ EventStates aState,
+ bool aAddState)
+{
+ for (; aStartNode && aStartNode != aStopBefore;
+ aStartNode = aStartNode->GetFlattenedTreeParent()) {
+ // We might be starting with a non-element (e.g. a text node) and
+ // if someone is doing something weird might be ending with a
+ // non-element too (e.g. a document fragment)
+ if (!aStartNode->IsElement()) {
+ continue;
+ }
+ Element* element = aStartNode->AsElement();
+ DoStateChange(element, aState, aAddState);
+ Element* labelTarget = GetLabelTarget(element);
+ if (labelTarget) {
+ DoStateChange(labelTarget, aState, aAddState);
+ }
+ }
+
+ if (aAddState) {
+ // We might be in a situation where a node was in hover both
+ // because it was hovered and because the label for it was
+ // hovered, and while we stopped hovering the node the label is
+ // still hovered. Or we might have had two nested labels for the
+ // same node, and while one is no longer hovered the other still
+ // is. In that situation, the label that's still hovered will be
+ // aStopBefore or some ancestor of it, and the call we just made
+ // to UpdateAncestorState with aAddState = false would have
+ // removed the hover state from the node. But the node should
+ // still be in hover state. To handle this situation we need to
+ // keep walking up the tree and any time we find a label mark its
+ // corresponding node as still in our state.
+ for ( ; aStartNode; aStartNode = aStartNode->GetFlattenedTreeParent()) {
+ if (!aStartNode->IsElement()) {
+ continue;
+ }
+
+ Element* labelTarget = GetLabelTarget(aStartNode->AsElement());
+ if (labelTarget && !labelTarget->State().HasState(aState)) {
+ DoStateChange(labelTarget, aState, true);
+ }
+ }
+ }
+}
+
+bool
+EventStateManager::SetContentState(nsIContent* aContent, EventStates aState)
+{
+ // We manage 4 states here: ACTIVE, HOVER, DRAGOVER, URLTARGET
+ // The input must be exactly one of them.
+ NS_PRECONDITION(aState == NS_EVENT_STATE_ACTIVE ||
+ aState == NS_EVENT_STATE_HOVER ||
+ aState == NS_EVENT_STATE_DRAGOVER ||
+ aState == NS_EVENT_STATE_URLTARGET,
+ "Unexpected state");
+
+ nsCOMPtr<nsIContent> notifyContent1;
+ nsCOMPtr<nsIContent> notifyContent2;
+ bool updateAncestors;
+
+ if (aState == NS_EVENT_STATE_HOVER || aState == NS_EVENT_STATE_ACTIVE) {
+ // Hover and active are hierarchical
+ updateAncestors = true;
+
+ // check to see that this state is allowed by style. Check dragover too?
+ // XXX Is this even what we want?
+ if (mCurrentTarget)
+ {
+ const nsStyleUserInterface* ui = mCurrentTarget->StyleUserInterface();
+ if (ui->mUserInput == StyleUserInput::None) {
+ return false;
+ }
+ }
+
+ if (aState == NS_EVENT_STATE_ACTIVE) {
+ // Editable content can never become active since their default actions
+ // are disabled. Watch out for editable content in native anonymous
+ // subtrees though, as they belong to text controls.
+ if (aContent && aContent->IsEditable() &&
+ !aContent->IsInNativeAnonymousSubtree()) {
+ aContent = nullptr;
+ }
+ if (aContent != mActiveContent) {
+ notifyContent1 = aContent;
+ notifyContent2 = mActiveContent;
+ mActiveContent = aContent;
+ }
+ } else {
+ NS_ASSERTION(aState == NS_EVENT_STATE_HOVER, "How did that happen?");
+ nsIContent* newHover;
+
+ if (mPresContext->IsDynamic()) {
+ newHover = aContent;
+ } else {
+ NS_ASSERTION(!aContent ||
+ aContent->GetComposedDoc() ==
+ mPresContext->PresShell()->GetDocument(),
+ "Unexpected document");
+ nsIFrame *frame = aContent ? aContent->GetPrimaryFrame() : nullptr;
+ if (frame && nsLayoutUtils::IsViewportScrollbarFrame(frame)) {
+ // The scrollbars of viewport should not ignore the hover state.
+ // Because they are *not* the content of the web page.
+ newHover = aContent;
+ } else {
+ // All contents of the web page should ignore the hover state.
+ newHover = nullptr;
+ }
+ }
+
+ if (newHover != mHoverContent) {
+ notifyContent1 = newHover;
+ notifyContent2 = mHoverContent;
+ mHoverContent = newHover;
+ }
+ }
+ } else {
+ updateAncestors = false;
+ if (aState == NS_EVENT_STATE_DRAGOVER) {
+ if (aContent != sDragOverContent) {
+ notifyContent1 = aContent;
+ notifyContent2 = sDragOverContent;
+ sDragOverContent = aContent;
+ }
+ } else if (aState == NS_EVENT_STATE_URLTARGET) {
+ if (aContent != mURLTargetContent) {
+ notifyContent1 = aContent;
+ notifyContent2 = mURLTargetContent;
+ mURLTargetContent = aContent;
+ }
+ }
+ }
+
+ // We need to keep track of which of notifyContent1 and notifyContent2 is
+ // getting the state set and which is getting it unset. If both are
+ // non-null, then notifyContent1 is having the state set and notifyContent2
+ // is having it unset. But if one of them is null, we need to keep track of
+ // the right thing for notifyContent1 explicitly.
+ bool content1StateSet = true;
+ if (!notifyContent1) {
+ // This is ok because FindCommonAncestor wouldn't find anything
+ // anyway if notifyContent1 is null.
+ notifyContent1 = notifyContent2;
+ notifyContent2 = nullptr;
+ content1StateSet = false;
+ }
+
+ if (notifyContent1 && mPresContext) {
+ EnsureDocument(mPresContext);
+ if (mDocument) {
+ nsAutoScriptBlocker scriptBlocker;
+
+ if (updateAncestors) {
+ nsCOMPtr<nsIContent> commonAncestor =
+ FindCommonAncestor(notifyContent1, notifyContent2);
+ if (notifyContent2) {
+ // It's very important to first notify the state removal and
+ // then the state addition, because due to labels it's
+ // possible that we're removing state from some element but
+ // then adding it again (say because mHoverContent changed
+ // from a control to its label).
+ UpdateAncestorState(notifyContent2, commonAncestor, aState, false);
+ }
+ UpdateAncestorState(notifyContent1, commonAncestor, aState,
+ content1StateSet);
+ } else {
+ if (notifyContent2) {
+ DoStateChange(notifyContent2, aState, false);
+ }
+ DoStateChange(notifyContent1, aState, content1StateSet);
+ }
+ }
+ }
+
+ return true;
+}
+
+void
+EventStateManager::ResetLastOverForContent(
+ const uint32_t& aIdx,
+ RefPtr<OverOutElementsWrapper>& aElemWrapper,
+ nsIContent* aContent)
+{
+ if (aElemWrapper && aElemWrapper->mLastOverElement &&
+ nsContentUtils::ContentIsDescendantOf(aElemWrapper->mLastOverElement,
+ aContent)) {
+ aElemWrapper->mLastOverElement = nullptr;
+ }
+}
+
+void
+EventStateManager::ContentRemoved(nsIDocument* aDocument, nsIContent* aContent)
+{
+ /*
+ * Anchor and area elements when focused or hovered might make the UI to show
+ * the current link. We want to make sure that the UI gets informed when they
+ * are actually removed from the DOM.
+ */
+ if (aContent->IsAnyOfHTMLElements(nsGkAtoms::a, nsGkAtoms::area) &&
+ (aContent->AsElement()->State().HasAtLeastOneOfStates(NS_EVENT_STATE_FOCUS |
+ NS_EVENT_STATE_HOVER))) {
+ nsGenericHTMLElement* element = static_cast<nsGenericHTMLElement*>(aContent);
+ element->LeaveLink(
+ element->GetPresContext(nsGenericHTMLElement::eForComposedDoc));
+ }
+
+ IMEStateManager::OnRemoveContent(mPresContext, aContent);
+
+ // inform the focus manager that the content is being removed. If this
+ // content is focused, the focus will be removed without firing events.
+ nsFocusManager* fm = nsFocusManager::GetFocusManager();
+ if (fm)
+ fm->ContentRemoved(aDocument, aContent);
+
+ if (mHoverContent &&
+ nsContentUtils::ContentIsDescendantOf(mHoverContent, aContent)) {
+ // Since hover is hierarchical, set the current hover to the
+ // content's parent node.
+ SetContentState(aContent->GetParent(), NS_EVENT_STATE_HOVER);
+ }
+
+ if (mActiveContent &&
+ nsContentUtils::ContentIsDescendantOf(mActiveContent, aContent)) {
+ // Active is hierarchical, so set the current active to the
+ // content's parent node.
+ SetContentState(aContent->GetParent(), NS_EVENT_STATE_ACTIVE);
+ }
+
+ if (sDragOverContent &&
+ sDragOverContent->OwnerDoc() == aContent->OwnerDoc() &&
+ nsContentUtils::ContentIsDescendantOf(sDragOverContent, aContent)) {
+ sDragOverContent = nullptr;
+ }
+
+ // See bug 292146 for why we want to null this out
+ ResetLastOverForContent(0, mMouseEnterLeaveHelper, aContent);
+ for (auto iter = mPointersEnterLeaveHelper.Iter();
+ !iter.Done();
+ iter.Next()) {
+ ResetLastOverForContent(iter.Key(), iter.Data(), aContent);
+ }
+}
+
+bool
+EventStateManager::EventStatusOK(WidgetGUIEvent* aEvent)
+{
+ return !(aEvent->mMessage == eMouseDown &&
+ aEvent->AsMouseEvent()->button == WidgetMouseEvent::eLeftButton &&
+ !sNormalLMouseEventInProcess);
+}
+
+//-------------------------------------------
+// Access Key Registration
+//-------------------------------------------
+void
+EventStateManager::RegisterAccessKey(nsIContent* aContent, uint32_t aKey)
+{
+ if (aContent && mAccessKeys.IndexOf(aContent) == -1)
+ mAccessKeys.AppendObject(aContent);
+}
+
+void
+EventStateManager::UnregisterAccessKey(nsIContent* aContent, uint32_t aKey)
+{
+ if (aContent)
+ mAccessKeys.RemoveObject(aContent);
+}
+
+uint32_t
+EventStateManager::GetRegisteredAccessKey(nsIContent* aContent)
+{
+ MOZ_ASSERT(aContent);
+
+ if (mAccessKeys.IndexOf(aContent) == -1)
+ return 0;
+
+ nsAutoString accessKey;
+ aContent->GetAttr(kNameSpaceID_None, nsGkAtoms::accesskey, accessKey);
+ return accessKey.First();
+}
+
+void
+EventStateManager::EnsureDocument(nsPresContext* aPresContext)
+{
+ if (!mDocument)
+ mDocument = aPresContext->Document();
+}
+
+void
+EventStateManager::FlushPendingEvents(nsPresContext* aPresContext)
+{
+ NS_PRECONDITION(nullptr != aPresContext, "nullptr ptr");
+ nsIPresShell *shell = aPresContext->GetPresShell();
+ if (shell) {
+ shell->FlushPendingNotifications(Flush_InterruptibleLayout);
+ }
+}
+
+nsIContent*
+EventStateManager::GetFocusedContent()
+{
+ nsIFocusManager* fm = nsFocusManager::GetFocusManager();
+ EnsureDocument(mPresContext);
+ if (!fm || !mDocument)
+ return nullptr;
+
+ nsCOMPtr<nsPIDOMWindowOuter> focusedWindow;
+ return nsFocusManager::GetFocusedDescendant(mDocument->GetWindow(), false,
+ getter_AddRefs(focusedWindow));
+}
+
+//-------------------------------------------------------
+// Return true if the docshell is visible
+
+bool
+EventStateManager::IsShellVisible(nsIDocShell* aShell)
+{
+ NS_ASSERTION(aShell, "docshell is null");
+
+ nsCOMPtr<nsIBaseWindow> basewin = do_QueryInterface(aShell);
+ if (!basewin)
+ return true;
+
+ bool isVisible = true;
+ basewin->GetVisibility(&isVisible);
+
+ // We should be doing some additional checks here so that
+ // we don't tab into hidden tabs of tabbrowser. -bryner
+
+ return isVisible;
+}
+
+nsresult
+EventStateManager::DoContentCommandEvent(WidgetContentCommandEvent* aEvent)
+{
+ EnsureDocument(mPresContext);
+ NS_ENSURE_TRUE(mDocument, NS_ERROR_FAILURE);
+ nsCOMPtr<nsPIDOMWindowOuter> window(mDocument->GetWindow());
+ NS_ENSURE_TRUE(window, NS_ERROR_FAILURE);
+
+ nsCOMPtr<nsPIWindowRoot> root = window->GetTopWindowRoot();
+ NS_ENSURE_TRUE(root, NS_ERROR_FAILURE);
+ const char* cmd;
+ switch (aEvent->mMessage) {
+ case eContentCommandCut:
+ cmd = "cmd_cut";
+ break;
+ case eContentCommandCopy:
+ cmd = "cmd_copy";
+ break;
+ case eContentCommandPaste:
+ cmd = "cmd_paste";
+ break;
+ case eContentCommandDelete:
+ cmd = "cmd_delete";
+ break;
+ case eContentCommandUndo:
+ cmd = "cmd_undo";
+ break;
+ case eContentCommandRedo:
+ cmd = "cmd_redo";
+ break;
+ case eContentCommandPasteTransferable:
+ cmd = "cmd_pasteTransferable";
+ break;
+ case eContentCommandLookUpDictionary:
+ cmd = "cmd_lookUpDictionary";
+ break;
+ default:
+ return NS_ERROR_NOT_IMPLEMENTED;
+ }
+ nsCOMPtr<nsIController> controller;
+ nsresult rv = root->GetControllerForCommand(cmd, getter_AddRefs(controller));
+ NS_ENSURE_SUCCESS(rv, rv);
+ if (!controller) {
+ // When GetControllerForCommand succeeded but there is no controller, the
+ // command isn't supported.
+ aEvent->mIsEnabled = false;
+ } else {
+ bool canDoIt;
+ rv = controller->IsCommandEnabled(cmd, &canDoIt);
+ NS_ENSURE_SUCCESS(rv, rv);
+ aEvent->mIsEnabled = canDoIt;
+ if (canDoIt && !aEvent->mOnlyEnabledCheck) {
+ switch (aEvent->mMessage) {
+ case eContentCommandPasteTransferable: {
+ nsFocusManager* fm = nsFocusManager::GetFocusManager();
+ nsIContent* focusedContent = fm ? fm->GetFocusedContent() : nullptr;
+ RefPtr<TabParent> remote = TabParent::GetFrom(focusedContent);
+ if (remote) {
+ NS_ENSURE_TRUE(remote->Manager()->IsContentParent(), NS_ERROR_FAILURE);
+
+ nsCOMPtr<nsITransferable> transferable = aEvent->mTransferable;
+ IPCDataTransfer ipcDataTransfer;
+ ContentParent* cp = remote->Manager()->AsContentParent();
+ nsContentUtils::TransferableToIPCTransferable(transferable,
+ &ipcDataTransfer,
+ false, nullptr,
+ cp);
+ bool isPrivateData = false;
+ transferable->GetIsPrivateData(&isPrivateData);
+ nsCOMPtr<nsIPrincipal> requestingPrincipal;
+ transferable->GetRequestingPrincipal(getter_AddRefs(requestingPrincipal));
+ remote->SendPasteTransferable(ipcDataTransfer, isPrivateData,
+ IPC::Principal(requestingPrincipal));
+ rv = NS_OK;
+ } else {
+ nsCOMPtr<nsICommandController> commandController = do_QueryInterface(controller);
+ NS_ENSURE_STATE(commandController);
+
+ nsCOMPtr<nsICommandParams> params = do_CreateInstance("@mozilla.org/embedcomp/command-params;1", &rv);
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ rv = params->SetISupportsValue("transferable", aEvent->mTransferable);
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ rv = commandController->DoCommandWithParams(cmd, params);
+ }
+ break;
+ }
+
+ case eContentCommandLookUpDictionary: {
+ nsCOMPtr<nsICommandController> commandController =
+ do_QueryInterface(controller);
+ if (NS_WARN_IF(!commandController)) {
+ return NS_ERROR_FAILURE;
+ }
+
+ nsCOMPtr<nsICommandParams> params =
+ do_CreateInstance("@mozilla.org/embedcomp/command-params;1", &rv);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+
+ rv = params->SetLongValue("x", aEvent->mRefPoint.x);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+
+ rv = params->SetLongValue("y", aEvent->mRefPoint.y);
+ if (NS_WARN_IF(NS_FAILED(rv))) {
+ return rv;
+ }
+
+ rv = commandController->DoCommandWithParams(cmd, params);
+ break;
+ }
+
+ default:
+ rv = controller->DoCommand(cmd);
+ break;
+ }
+ NS_ENSURE_SUCCESS(rv, rv);
+ }
+ }
+ aEvent->mSucceeded = true;
+ return NS_OK;
+}
+
+nsresult
+EventStateManager::DoContentCommandScrollEvent(
+ WidgetContentCommandEvent* aEvent)
+{
+ NS_ENSURE_TRUE(mPresContext, NS_ERROR_NOT_AVAILABLE);
+ nsIPresShell* ps = mPresContext->GetPresShell();
+ NS_ENSURE_TRUE(ps, NS_ERROR_NOT_AVAILABLE);
+ NS_ENSURE_TRUE(aEvent->mScroll.mAmount != 0, NS_ERROR_INVALID_ARG);
+
+ nsIScrollableFrame::ScrollUnit scrollUnit;
+ switch (aEvent->mScroll.mUnit) {
+ case WidgetContentCommandEvent::eCmdScrollUnit_Line:
+ scrollUnit = nsIScrollableFrame::LINES;
+ break;
+ case WidgetContentCommandEvent::eCmdScrollUnit_Page:
+ scrollUnit = nsIScrollableFrame::PAGES;
+ break;
+ case WidgetContentCommandEvent::eCmdScrollUnit_Whole:
+ scrollUnit = nsIScrollableFrame::WHOLE;
+ break;
+ default:
+ return NS_ERROR_INVALID_ARG;
+ }
+
+ aEvent->mSucceeded = true;
+
+ nsIScrollableFrame* sf =
+ ps->GetFrameToScrollAsScrollable(nsIPresShell::eEither);
+ aEvent->mIsEnabled = sf ?
+ (aEvent->mScroll.mIsHorizontal ?
+ WheelHandlingUtils::CanScrollOn(sf, aEvent->mScroll.mAmount, 0) :
+ WheelHandlingUtils::CanScrollOn(sf, 0, aEvent->mScroll.mAmount)) : false;
+
+ if (!aEvent->mIsEnabled || aEvent->mOnlyEnabledCheck) {
+ return NS_OK;
+ }
+
+ nsIntPoint pt(0, 0);
+ if (aEvent->mScroll.mIsHorizontal) {
+ pt.x = aEvent->mScroll.mAmount;
+ } else {
+ pt.y = aEvent->mScroll.mAmount;
+ }
+
+ // The caller may want synchronous scrolling.
+ sf->ScrollBy(pt, scrollUnit, nsIScrollableFrame::INSTANT);
+ return NS_OK;
+}
+
+void
+EventStateManager::SetActiveManager(EventStateManager* aNewESM,
+ nsIContent* aContent)
+{
+ if (sActiveESM && aNewESM != sActiveESM) {
+ sActiveESM->SetContentState(nullptr, NS_EVENT_STATE_ACTIVE);
+ }
+ sActiveESM = aNewESM;
+ if (sActiveESM && aContent) {
+ sActiveESM->SetContentState(aContent, NS_EVENT_STATE_ACTIVE);
+ }
+}
+
+void
+EventStateManager::ClearGlobalActiveContent(EventStateManager* aClearer)
+{
+ if (aClearer) {
+ aClearer->SetContentState(nullptr, NS_EVENT_STATE_ACTIVE);
+ if (sDragOverContent) {
+ aClearer->SetContentState(nullptr, NS_EVENT_STATE_DRAGOVER);
+ }
+ }
+ if (sActiveESM && aClearer != sActiveESM) {
+ sActiveESM->SetContentState(nullptr, NS_EVENT_STATE_ACTIVE);
+ }
+ sActiveESM = nullptr;
+}
+
+/******************************************************************/
+/* mozilla::EventStateManager::DeltaAccumulator */
+/******************************************************************/
+
+void
+EventStateManager::DeltaAccumulator::InitLineOrPageDelta(
+ nsIFrame* aTargetFrame,
+ EventStateManager* aESM,
+ WidgetWheelEvent* aEvent)
+{
+ MOZ_ASSERT(aESM);
+ MOZ_ASSERT(aEvent);
+
+ // Reset if the previous wheel event is too old.
+ if (!mLastTime.IsNull()) {
+ TimeDuration duration = TimeStamp::Now() - mLastTime;
+ if (duration.ToMilliseconds() > WheelTransaction::GetTimeoutTime()) {
+ Reset();
+ }
+ }
+ // If we have accumulated delta, we may need to reset it.
+ if (IsInTransaction()) {
+ // If wheel event type is changed, reset the values.
+ if (mHandlingDeltaMode != aEvent->mDeltaMode ||
+ mIsNoLineOrPageDeltaDevice != aEvent->mIsNoLineOrPageDelta) {
+ Reset();
+ } else {
+ // If the delta direction is changed, we should reset only the
+ // accumulated values.
+ if (mX && aEvent->mDeltaX && ((aEvent->mDeltaX > 0.0) != (mX > 0.0))) {
+ mX = mPendingScrollAmountX = 0.0;
+ }
+ if (mY && aEvent->mDeltaY && ((aEvent->mDeltaY > 0.0) != (mY > 0.0))) {
+ mY = mPendingScrollAmountY = 0.0;
+ }
+ }
+ }
+
+ mHandlingDeltaMode = aEvent->mDeltaMode;
+ mIsNoLineOrPageDeltaDevice = aEvent->mIsNoLineOrPageDelta;
+
+ // If it's handling neither a device that does not provide line or page deltas
+ // nor delta values multiplied by prefs, we must not modify lineOrPageDelta
+ // values.
+ if (!mIsNoLineOrPageDeltaDevice &&
+ !EventStateManager::WheelPrefs::GetInstance()->
+ NeedToComputeLineOrPageDelta(aEvent)) {
+ // Set the delta values to mX and mY. They would be used when above block
+ // resets mX/mY/mPendingScrollAmountX/mPendingScrollAmountY if the direction
+ // is changed.
+ // NOTE: We shouldn't accumulate the delta values, it might could cause
+ // overflow even though it's not a realistic situation.
+ if (aEvent->mDeltaX) {
+ mX = aEvent->mDeltaX;
+ }
+ if (aEvent->mDeltaY) {
+ mY = aEvent->mDeltaY;
+ }
+ mLastTime = TimeStamp::Now();
+ return;
+ }
+
+ mX += aEvent->mDeltaX;
+ mY += aEvent->mDeltaY;
+
+ if (mHandlingDeltaMode == nsIDOMWheelEvent::DOM_DELTA_PIXEL) {
+ // Records pixel delta values and init mLineOrPageDeltaX and
+ // mLineOrPageDeltaY for wheel events which are caused by pixel only
+ // devices. Ignore mouse wheel transaction for computing this. The
+ // lineOrPageDelta values will be used by dispatching legacy
+ // eMouseScrollEventClass (DOMMouseScroll) but not be used for scrolling
+ // of default action. The transaction should be used only for the default
+ // action.
+ nsIFrame* frame =
+ aESM->ComputeScrollTarget(aTargetFrame, aEvent,
+ COMPUTE_LEGACY_MOUSE_SCROLL_EVENT_TARGET);
+ nsPresContext* pc =
+ frame ? frame->PresContext() : aTargetFrame->PresContext();
+ nsIScrollableFrame* scrollTarget = do_QueryFrame(frame);
+ nsSize scrollAmount = aESM->GetScrollAmount(pc, aEvent, scrollTarget);
+ nsIntSize scrollAmountInCSSPixels(
+ nsPresContext::AppUnitsToIntCSSPixels(scrollAmount.width),
+ nsPresContext::AppUnitsToIntCSSPixels(scrollAmount.height));
+
+ aEvent->mLineOrPageDeltaX = RoundDown(mX) / scrollAmountInCSSPixels.width;
+ aEvent->mLineOrPageDeltaY = RoundDown(mY) / scrollAmountInCSSPixels.height;
+
+ mX -= aEvent->mLineOrPageDeltaX * scrollAmountInCSSPixels.width;
+ mY -= aEvent->mLineOrPageDeltaY * scrollAmountInCSSPixels.height;
+ } else {
+ aEvent->mLineOrPageDeltaX = RoundDown(mX);
+ aEvent->mLineOrPageDeltaY = RoundDown(mY);
+ mX -= aEvent->mLineOrPageDeltaX;
+ mY -= aEvent->mLineOrPageDeltaY;
+ }
+
+ mLastTime = TimeStamp::Now();
+}
+
+void
+EventStateManager::DeltaAccumulator::Reset()
+{
+ mX = mY = 0.0;
+ mPendingScrollAmountX = mPendingScrollAmountY = 0.0;
+ mHandlingDeltaMode = UINT32_MAX;
+ mIsNoLineOrPageDeltaDevice = false;
+}
+
+nsIntPoint
+EventStateManager::DeltaAccumulator::ComputeScrollAmountForDefaultAction(
+ WidgetWheelEvent* aEvent,
+ const nsIntSize& aScrollAmountInDevPixels)
+{
+ MOZ_ASSERT(aEvent);
+
+ // If the wheel event is line scroll and the delta value is computed from
+ // system settings, allow to override the system speed.
+ bool allowScrollSpeedOverride =
+ (!aEvent->mCustomizedByUserPrefs &&
+ aEvent->mDeltaMode == nsIDOMWheelEvent::DOM_DELTA_LINE);
+ DeltaValues acceleratedDelta =
+ WheelTransaction::AccelerateWheelDelta(aEvent, allowScrollSpeedOverride);
+
+ nsIntPoint result(0, 0);
+ if (aEvent->mDeltaMode == nsIDOMWheelEvent::DOM_DELTA_PIXEL) {
+ mPendingScrollAmountX += acceleratedDelta.deltaX;
+ mPendingScrollAmountY += acceleratedDelta.deltaY;
+ } else {
+ mPendingScrollAmountX +=
+ aScrollAmountInDevPixels.width * acceleratedDelta.deltaX;
+ mPendingScrollAmountY +=
+ aScrollAmountInDevPixels.height * acceleratedDelta.deltaY;
+ }
+ result.x = RoundDown(mPendingScrollAmountX);
+ result.y = RoundDown(mPendingScrollAmountY);
+ mPendingScrollAmountX -= result.x;
+ mPendingScrollAmountY -= result.y;
+
+ return result;
+}
+
+/******************************************************************/
+/* mozilla::EventStateManager::WheelPrefs */
+/******************************************************************/
+
+// static
+EventStateManager::WheelPrefs*
+EventStateManager::WheelPrefs::GetInstance()
+{
+ if (!sInstance) {
+ sInstance = new WheelPrefs();
+ }
+ return sInstance;
+}
+
+// static
+void
+EventStateManager::WheelPrefs::Shutdown()
+{
+ delete sInstance;
+ sInstance = nullptr;
+}
+
+// static
+void
+EventStateManager::WheelPrefs::OnPrefChanged(const char* aPrefName,
+ void* aClosure)
+{
+ // forget all prefs, it's not problem for performance.
+ sInstance->Reset();
+ DeltaAccumulator::GetInstance()->Reset();
+}
+
+EventStateManager::WheelPrefs::WheelPrefs()
+{
+ Reset();
+ Preferences::RegisterCallback(OnPrefChanged, "mousewheel.", nullptr);
+ Preferences::AddBoolVarCache(&sWheelEventsEnabledOnPlugins,
+ "plugin.mousewheel.enabled",
+ true);
+}
+
+EventStateManager::WheelPrefs::~WheelPrefs()
+{
+ Preferences::UnregisterCallback(OnPrefChanged, "mousewheel.", nullptr);
+}
+
+void
+EventStateManager::WheelPrefs::Reset()
+{
+ memset(mInit, 0, sizeof(mInit));
+
+}
+
+EventStateManager::WheelPrefs::Index
+EventStateManager::WheelPrefs::GetIndexFor(WidgetWheelEvent* aEvent)
+{
+ if (!aEvent) {
+ return INDEX_DEFAULT;
+ }
+
+ Modifiers modifiers =
+ (aEvent->mModifiers & (MODIFIER_ALT |
+ MODIFIER_CONTROL |
+ MODIFIER_META |
+ MODIFIER_SHIFT |
+ MODIFIER_OS));
+
+ switch (modifiers) {
+ case MODIFIER_ALT:
+ return INDEX_ALT;
+ case MODIFIER_CONTROL:
+ return INDEX_CONTROL;
+ case MODIFIER_META:
+ return INDEX_META;
+ case MODIFIER_SHIFT:
+ return INDEX_SHIFT;
+ case MODIFIER_OS:
+ return INDEX_OS;
+ default:
+ // If two or more modifier keys are pressed, we should use default
+ // settings.
+ return INDEX_DEFAULT;
+ }
+}
+
+void
+EventStateManager::WheelPrefs::GetBasePrefName(
+ EventStateManager::WheelPrefs::Index aIndex,
+ nsACString& aBasePrefName)
+{
+ aBasePrefName.AssignLiteral("mousewheel.");
+ switch (aIndex) {
+ case INDEX_ALT:
+ aBasePrefName.AppendLiteral("with_alt.");
+ break;
+ case INDEX_CONTROL:
+ aBasePrefName.AppendLiteral("with_control.");
+ break;
+ case INDEX_META:
+ aBasePrefName.AppendLiteral("with_meta.");
+ break;
+ case INDEX_SHIFT:
+ aBasePrefName.AppendLiteral("with_shift.");
+ break;
+ case INDEX_OS:
+ aBasePrefName.AppendLiteral("with_win.");
+ break;
+ case INDEX_DEFAULT:
+ default:
+ aBasePrefName.AppendLiteral("default.");
+ break;
+ }
+}
+
+void
+EventStateManager::WheelPrefs::Init(EventStateManager::WheelPrefs::Index aIndex)
+{
+ if (mInit[aIndex]) {
+ return;
+ }
+ mInit[aIndex] = true;
+
+ nsAutoCString basePrefName;
+ GetBasePrefName(aIndex, basePrefName);
+
+ nsAutoCString prefNameX(basePrefName);
+ prefNameX.AppendLiteral("delta_multiplier_x");
+ mMultiplierX[aIndex] =
+ static_cast<double>(Preferences::GetInt(prefNameX.get(), 100)) / 100;
+
+ nsAutoCString prefNameY(basePrefName);
+ prefNameY.AppendLiteral("delta_multiplier_y");
+ mMultiplierY[aIndex] =
+ static_cast<double>(Preferences::GetInt(prefNameY.get(), 100)) / 100;
+
+ nsAutoCString prefNameZ(basePrefName);
+ prefNameZ.AppendLiteral("delta_multiplier_z");
+ mMultiplierZ[aIndex] =
+ static_cast<double>(Preferences::GetInt(prefNameZ.get(), 100)) / 100;
+
+ nsAutoCString prefNameAction(basePrefName);
+ prefNameAction.AppendLiteral("action");
+ int32_t action = Preferences::GetInt(prefNameAction.get(), ACTION_SCROLL);
+ if (action < int32_t(ACTION_NONE) || action > int32_t(ACTION_LAST)) {
+ NS_WARNING("Unsupported action pref value, replaced with 'Scroll'.");
+ action = ACTION_SCROLL;
+ }
+ mActions[aIndex] = static_cast<Action>(action);
+
+ // Compute action values overridden by .override_x pref.
+ // At present, override is possible only for the x-direction
+ // because this pref is introduced mainly for tilt wheels.
+ prefNameAction.AppendLiteral(".override_x");
+ int32_t actionOverrideX = Preferences::GetInt(prefNameAction.get(), -1);
+ if (actionOverrideX < -1 || actionOverrideX > int32_t(ACTION_LAST)) {
+ NS_WARNING("Unsupported action override pref value, didn't override.");
+ actionOverrideX = -1;
+ }
+ mOverriddenActionsX[aIndex] = (actionOverrideX == -1)
+ ? static_cast<Action>(action)
+ : static_cast<Action>(actionOverrideX);
+}
+
+void
+EventStateManager::WheelPrefs::ApplyUserPrefsToDelta(WidgetWheelEvent* aEvent)
+{
+ if (aEvent->mCustomizedByUserPrefs) {
+ return;
+ }
+
+ Index index = GetIndexFor(aEvent);
+ Init(index);
+
+ aEvent->mDeltaX *= mMultiplierX[index];
+ aEvent->mDeltaY *= mMultiplierY[index];
+ aEvent->mDeltaZ *= mMultiplierZ[index];
+
+ // If the multiplier is 1.0 or -1.0, i.e., it doesn't change the absolute
+ // value, we should use lineOrPageDelta values which were set by widget.
+ // Otherwise, we need to compute them from accumulated delta values.
+ if (!NeedToComputeLineOrPageDelta(aEvent)) {
+ aEvent->mLineOrPageDeltaX *= static_cast<int32_t>(mMultiplierX[index]);
+ aEvent->mLineOrPageDeltaY *= static_cast<int32_t>(mMultiplierY[index]);
+ } else {
+ aEvent->mLineOrPageDeltaX = 0;
+ aEvent->mLineOrPageDeltaY = 0;
+ }
+
+ aEvent->mCustomizedByUserPrefs =
+ ((mMultiplierX[index] != 1.0) || (mMultiplierY[index] != 1.0) ||
+ (mMultiplierZ[index] != 1.0));
+}
+
+void
+EventStateManager::WheelPrefs::CancelApplyingUserPrefsFromOverflowDelta(
+ WidgetWheelEvent* aEvent)
+{
+ Index index = GetIndexFor(aEvent);
+ Init(index);
+
+ // XXX If the multiplier pref value is negative, the scroll direction was
+ // changed and caused to scroll different direction. In such case,
+ // this method reverts the sign of overflowDelta. Does it make widget
+ // happy? Although, widget can know the pref applied delta values by
+ // referrencing the deltaX and deltaY of the event.
+
+ if (mMultiplierX[index]) {
+ aEvent->mOverflowDeltaX /= mMultiplierX[index];
+ }
+ if (mMultiplierY[index]) {
+ aEvent->mOverflowDeltaY /= mMultiplierY[index];
+ }
+}
+
+EventStateManager::WheelPrefs::Action
+EventStateManager::WheelPrefs::ComputeActionFor(WidgetWheelEvent* aEvent)
+{
+ Index index = GetIndexFor(aEvent);
+ Init(index);
+
+ bool deltaXPreferred =
+ (Abs(aEvent->mDeltaX) > Abs(aEvent->mDeltaY) &&
+ Abs(aEvent->mDeltaX) > Abs(aEvent->mDeltaZ));
+ Action* actions = deltaXPreferred ? mOverriddenActionsX : mActions;
+ if (actions[index] == ACTION_NONE || actions[index] == ACTION_SCROLL) {
+ return actions[index];
+ }
+
+ // Momentum events shouldn't run special actions.
+ if (aEvent->mIsMomentum) {
+ // Use the default action. Note that user might kill the wheel scrolling.
+ Init(INDEX_DEFAULT);
+ return (actions[INDEX_DEFAULT] == ACTION_SCROLL) ? ACTION_SCROLL :
+ ACTION_NONE;
+ }
+
+ return actions[index];
+}
+
+bool
+EventStateManager::WheelPrefs::NeedToComputeLineOrPageDelta(
+ WidgetWheelEvent* aEvent)
+{
+ Index index = GetIndexFor(aEvent);
+ Init(index);
+
+ return (mMultiplierX[index] != 1.0 && mMultiplierX[index] != -1.0) ||
+ (mMultiplierY[index] != 1.0 && mMultiplierY[index] != -1.0);
+}
+
+void
+EventStateManager::WheelPrefs::GetUserPrefsForEvent(WidgetWheelEvent* aEvent,
+ double* aOutMultiplierX,
+ double* aOutMultiplierY)
+{
+ Index index = GetIndexFor(aEvent);
+ Init(index);
+
+ *aOutMultiplierX = mMultiplierX[index];
+ *aOutMultiplierY = mMultiplierY[index];
+}
+
+// static
+bool
+EventStateManager::WheelPrefs::WheelEventsEnabledOnPlugins()
+{
+ if (!sInstance) {
+ GetInstance(); // initializing sWheelEventsEnabledOnPlugins
+ }
+ return sWheelEventsEnabledOnPlugins;
+}
+
+bool
+EventStateManager::WheelEventIsScrollAction(WidgetWheelEvent* aEvent)
+{
+ return aEvent->mMessage == eWheel &&
+ WheelPrefs::GetInstance()->ComputeActionFor(aEvent) == WheelPrefs::ACTION_SCROLL;
+}
+
+void
+EventStateManager::GetUserPrefsForWheelEvent(WidgetWheelEvent* aEvent,
+ double* aOutMultiplierX,
+ double* aOutMultiplierY)
+{
+ WheelPrefs::GetInstance()->GetUserPrefsForEvent(
+ aEvent, aOutMultiplierX, aOutMultiplierY);
+}
+
+bool
+EventStateManager::WheelPrefs::IsOverOnePageScrollAllowedX(
+ WidgetWheelEvent* aEvent)
+{
+ Index index = GetIndexFor(aEvent);
+ Init(index);
+ return Abs(mMultiplierX[index]) >=
+ MIN_MULTIPLIER_VALUE_ALLOWING_OVER_ONE_PAGE_SCROLL;
+}
+
+bool
+EventStateManager::WheelPrefs::IsOverOnePageScrollAllowedY(
+ WidgetWheelEvent* aEvent)
+{
+ Index index = GetIndexFor(aEvent);
+ Init(index);
+ return Abs(mMultiplierY[index]) >=
+ MIN_MULTIPLIER_VALUE_ALLOWING_OVER_ONE_PAGE_SCROLL;
+}
+
+/******************************************************************/
+/* mozilla::EventStateManager::Prefs */
+/******************************************************************/
+
+bool EventStateManager::Prefs::sKeyCausesActivation = true;
+bool EventStateManager::Prefs::sClickHoldContextMenu = false;
+int32_t EventStateManager::Prefs::sGenericAccessModifierKey = -1;
+int32_t EventStateManager::Prefs::sChromeAccessModifierMask = 0;
+int32_t EventStateManager::Prefs::sContentAccessModifierMask = 0;
+
+// static
+void
+EventStateManager::Prefs::Init()
+{
+ DebugOnly<nsresult> rv = Preferences::RegisterCallback(OnChange, "dom.popup_allowed_events");
+ MOZ_ASSERT(NS_SUCCEEDED(rv),
+ "Failed to observe \"dom.popup_allowed_events\"");
+
+ static bool sPrefsAlreadyCached = false;
+ if (sPrefsAlreadyCached) {
+ return;
+ }
+
+ rv = Preferences::AddBoolVarCache(&sKeyCausesActivation,
+ "accessibility.accesskeycausesactivation",
+ sKeyCausesActivation);
+ MOZ_ASSERT(NS_SUCCEEDED(rv),
+ "Failed to observe \"accessibility.accesskeycausesactivation\"");
+ rv = Preferences::AddBoolVarCache(&sClickHoldContextMenu,
+ "ui.click_hold_context_menus",
+ sClickHoldContextMenu);
+ MOZ_ASSERT(NS_SUCCEEDED(rv),
+ "Failed to observe \"ui.click_hold_context_menus\"");
+ rv = Preferences::AddIntVarCache(&sGenericAccessModifierKey,
+ "ui.key.generalAccessKey",
+ sGenericAccessModifierKey);
+ MOZ_ASSERT(NS_SUCCEEDED(rv),
+ "Failed to observe \"ui.key.generalAccessKey\"");
+ rv = Preferences::AddIntVarCache(&sChromeAccessModifierMask,
+ "ui.key.chromeAccess",
+ sChromeAccessModifierMask);
+ MOZ_ASSERT(NS_SUCCEEDED(rv),
+ "Failed to observe \"ui.key.chromeAccess\"");
+ rv = Preferences::AddIntVarCache(&sContentAccessModifierMask,
+ "ui.key.contentAccess",
+ sContentAccessModifierMask);
+ MOZ_ASSERT(NS_SUCCEEDED(rv),
+ "Failed to observe \"ui.key.contentAccess\"");
+ sPrefsAlreadyCached = true;
+}
+
+// static
+void
+EventStateManager::Prefs::OnChange(const char* aPrefName, void*)
+{
+ nsDependentCString prefName(aPrefName);
+ if (prefName.EqualsLiteral("dom.popup_allowed_events")) {
+ Event::PopupAllowedEventsChanged();
+ }
+}
+
+// static
+void
+EventStateManager::Prefs::Shutdown()
+{
+ Preferences::UnregisterCallback(OnChange, "dom.popup_allowed_events");
+}
+
+// static
+int32_t
+EventStateManager::Prefs::ChromeAccessModifierMask()
+{
+ return GetAccessModifierMask(nsIDocShellTreeItem::typeChrome);
+}
+
+// static
+int32_t
+EventStateManager::Prefs::ContentAccessModifierMask()
+{
+ return GetAccessModifierMask(nsIDocShellTreeItem::typeContent);
+}
+
+// static
+int32_t
+EventStateManager::Prefs::GetAccessModifierMask(int32_t aItemType)
+{
+ switch (sGenericAccessModifierKey) {
+ case -1: break; // use the individual prefs
+ case nsIDOMKeyEvent::DOM_VK_SHIFT: return NS_MODIFIER_SHIFT;
+ case nsIDOMKeyEvent::DOM_VK_CONTROL: return NS_MODIFIER_CONTROL;
+ case nsIDOMKeyEvent::DOM_VK_ALT: return NS_MODIFIER_ALT;
+ case nsIDOMKeyEvent::DOM_VK_META: return NS_MODIFIER_META;
+ case nsIDOMKeyEvent::DOM_VK_WIN: return NS_MODIFIER_OS;
+ default: return 0;
+ }
+
+ switch (aItemType) {
+ case nsIDocShellTreeItem::typeChrome:
+ return sChromeAccessModifierMask;
+ case nsIDocShellTreeItem::typeContent:
+ return sContentAccessModifierMask;
+ default:
+ return 0;
+ }
+}
+
+/******************************************************************/
+/* mozilla::AutoHandlingUserInputStatePusher */
+/******************************************************************/
+
+AutoHandlingUserInputStatePusher::AutoHandlingUserInputStatePusher(
+ bool aIsHandlingUserInput,
+ WidgetEvent* aEvent,
+ nsIDocument* aDocument) :
+ mIsHandlingUserInput(aIsHandlingUserInput),
+ mIsMouseDown(aEvent && aEvent->mMessage == eMouseDown),
+ mResetFMMouseButtonHandlingState(false)
+{
+ if (!aIsHandlingUserInput) {
+ return;
+ }
+ EventStateManager::StartHandlingUserInput();
+ if (mIsMouseDown) {
+ nsIPresShell::SetCapturingContent(nullptr, 0);
+ nsIPresShell::AllowMouseCapture(true);
+ }
+ if (!aDocument || !aEvent || !aEvent->IsTrusted()) {
+ return;
+ }
+ mResetFMMouseButtonHandlingState =
+ (aEvent->mMessage == eMouseDown || aEvent->mMessage == eMouseUp);
+ if (mResetFMMouseButtonHandlingState) {
+ nsFocusManager* fm = nsFocusManager::GetFocusManager();
+ NS_ENSURE_TRUE_VOID(fm);
+ // If it's in modal state, mouse button event handling may be nested.
+ // E.g., a modal dialog is opened at mousedown or mouseup event handler
+ // and the dialog is clicked. Therefore, we should store current
+ // mouse button event handling document if nsFocusManager already has it.
+ mMouseButtonEventHandlingDocument =
+ fm->SetMouseButtonHandlingDocument(aDocument);
+ }
+}
+
+AutoHandlingUserInputStatePusher::~AutoHandlingUserInputStatePusher()
+{
+ if (!mIsHandlingUserInput) {
+ return;
+ }
+ EventStateManager::StopHandlingUserInput();
+ if (mIsMouseDown) {
+ nsIPresShell::AllowMouseCapture(false);
+ }
+ if (mResetFMMouseButtonHandlingState) {
+ nsFocusManager* fm = nsFocusManager::GetFocusManager();
+ NS_ENSURE_TRUE_VOID(fm);
+ nsCOMPtr<nsIDocument> handlingDocument =
+ fm->SetMouseButtonHandlingDocument(mMouseButtonEventHandlingDocument);
+ }
+}
+
+} // namespace mozilla