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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* 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 "nsPrintPreviewListener.h"
#include "mozilla/TextEvents.h"
#include "mozilla/dom/Element.h"
#include "mozilla/dom/Event.h" // for nsIDOMEvent::InternalDOMEvent()
#include "nsIDOMWindow.h"
#include "nsPIDOMWindow.h"
#include "nsIDOMElement.h"
#include "nsIDOMKeyEvent.h"
#include "nsIDOMEvent.h"
#include "nsIDocument.h"
#include "nsIDocShell.h"
#include "nsPresContext.h"
#include "nsFocusManager.h"
#include "nsLiteralString.h"
using namespace mozilla;
using namespace mozilla::dom;
NS_IMPL_ISUPPORTS(nsPrintPreviewListener, nsIDOMEventListener)
//
// nsPrintPreviewListener ctor
//
nsPrintPreviewListener::nsPrintPreviewListener(EventTarget* aTarget)
: mEventTarget(aTarget)
{
NS_ADDREF_THIS();
} // ctor
nsPrintPreviewListener::~nsPrintPreviewListener()
{
}
//-------------------------------------------------------
//
// AddListeners
//
// Subscribe to the events that will allow us to track various events.
//
nsresult
nsPrintPreviewListener::AddListeners()
{
if (mEventTarget) {
mEventTarget->AddEventListener(NS_LITERAL_STRING("click"), this, true);
mEventTarget->AddEventListener(NS_LITERAL_STRING("contextmenu"), this, true);
mEventTarget->AddEventListener(NS_LITERAL_STRING("keydown"), this, true);
mEventTarget->AddEventListener(NS_LITERAL_STRING("keypress"), this, true);
mEventTarget->AddEventListener(NS_LITERAL_STRING("keyup"), this, true);
mEventTarget->AddEventListener(NS_LITERAL_STRING("mousedown"), this, true);
mEventTarget->AddEventListener(NS_LITERAL_STRING("mousemove"), this, true);
mEventTarget->AddEventListener(NS_LITERAL_STRING("mouseout"), this, true);
mEventTarget->AddEventListener(NS_LITERAL_STRING("mouseover"), this, true);
mEventTarget->AddEventListener(NS_LITERAL_STRING("mouseup"), this, true);
mEventTarget->AddSystemEventListener(NS_LITERAL_STRING("keydown"),
this, true);
}
return NS_OK;
}
//-------------------------------------------------------
//
// RemoveListeners
//
// Unsubscribe from all the various events that we were listening to.
//
nsresult
nsPrintPreviewListener::RemoveListeners()
{
if (mEventTarget) {
mEventTarget->RemoveEventListener(NS_LITERAL_STRING("click"), this, true);
mEventTarget->RemoveEventListener(NS_LITERAL_STRING("contextmenu"), this, true);
mEventTarget->RemoveEventListener(NS_LITERAL_STRING("keydown"), this, true);
mEventTarget->RemoveEventListener(NS_LITERAL_STRING("keypress"), this, true);
mEventTarget->RemoveEventListener(NS_LITERAL_STRING("keyup"), this, true);
mEventTarget->RemoveEventListener(NS_LITERAL_STRING("mousedown"), this, true);
mEventTarget->RemoveEventListener(NS_LITERAL_STRING("mousemove"), this, true);
mEventTarget->RemoveEventListener(NS_LITERAL_STRING("mouseout"), this, true);
mEventTarget->RemoveEventListener(NS_LITERAL_STRING("mouseover"), this, true);
mEventTarget->RemoveEventListener(NS_LITERAL_STRING("mouseup"), this, true);
mEventTarget->RemoveSystemEventListener(NS_LITERAL_STRING("keydown"),
this, true);
}
return NS_OK;
}
//-------------------------------------------------------
//
// GetActionForEvent
//
// Helper function to let certain key events through
//
enum eEventAction {
eEventAction_Tab, eEventAction_ShiftTab,
eEventAction_Propagate, eEventAction_Suppress,
eEventAction_StopPropagation
};
static eEventAction
GetActionForEvent(nsIDOMEvent* aEvent)
{
WidgetKeyboardEvent* keyEvent =
aEvent->WidgetEventPtr()->AsKeyboardEvent();
if (!keyEvent) {
return eEventAction_Suppress;
}
if (keyEvent->mFlags.mInSystemGroup) {
NS_ASSERTION(keyEvent->mMessage == eKeyDown,
"Assuming we're listening only keydown event in system group");
return eEventAction_StopPropagation;
}
if (keyEvent->IsAlt() || keyEvent->IsControl() || keyEvent->IsMeta()) {
// Don't consume keydown event because following keypress event may be
// handled as access key or shortcut key.
return (keyEvent->mMessage == eKeyDown) ? eEventAction_StopPropagation :
eEventAction_Suppress;
}
static const uint32_t kOKKeyCodes[] = {
NS_VK_PAGE_UP, NS_VK_PAGE_DOWN,
NS_VK_UP, NS_VK_DOWN,
NS_VK_HOME, NS_VK_END
};
if (keyEvent->mKeyCode == NS_VK_TAB) {
return keyEvent->IsShift() ? eEventAction_ShiftTab : eEventAction_Tab;
}
if (keyEvent->mCharCode == ' ' || keyEvent->mKeyCode == NS_VK_SPACE) {
return eEventAction_Propagate;
}
if (keyEvent->IsShift()) {
return eEventAction_Suppress;
}
for (uint32_t i = 0; i < ArrayLength(kOKKeyCodes); ++i) {
if (keyEvent->mKeyCode == kOKKeyCodes[i]) {
return eEventAction_Propagate;
}
}
return eEventAction_Suppress;
}
NS_IMETHODIMP
nsPrintPreviewListener::HandleEvent(nsIDOMEvent* aEvent)
{
nsCOMPtr<nsIContent> content = do_QueryInterface(
aEvent ? aEvent->InternalDOMEvent()->GetOriginalTarget() : nullptr);
if (content && !content->IsXULElement()) {
eEventAction action = ::GetActionForEvent(aEvent);
switch (action) {
case eEventAction_Tab:
case eEventAction_ShiftTab:
{
nsAutoString eventString;
aEvent->GetType(eventString);
if (eventString.EqualsLiteral("keydown")) {
// Handle tabbing explicitly here since we don't want focus ending up
// inside the content document, bug 244128.
nsIDocument* doc = content->GetUncomposedDoc();
NS_ASSERTION(doc, "no document");
nsIDocument* parentDoc = doc->GetParentDocument();
NS_ASSERTION(parentDoc, "no parent document");
nsCOMPtr<nsPIDOMWindowOuter> win = parentDoc->GetWindow();
nsIFocusManager* fm = nsFocusManager::GetFocusManager();
if (fm && win) {
dom::Element* fromElement = parentDoc->FindContentForSubDocument(doc);
nsCOMPtr<nsIDOMElement> from = do_QueryInterface(fromElement);
bool forward = (action == eEventAction_Tab);
nsCOMPtr<nsIDOMElement> result;
fm->MoveFocus(win, from,
forward ? nsIFocusManager::MOVEFOCUS_FORWARD :
nsIFocusManager::MOVEFOCUS_BACKWARD,
nsIFocusManager::FLAG_BYKEY, getter_AddRefs(result));
}
}
}
MOZ_FALLTHROUGH;
case eEventAction_Suppress:
aEvent->StopPropagation();
aEvent->PreventDefault();
break;
case eEventAction_StopPropagation:
aEvent->StopPropagation();
break;
case eEventAction_Propagate:
// intentionally empty
break;
}
}
return NS_OK;
}
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