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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 /accessible/windows/msaa/nsWinUtils.cpp
parent49ee0794b5d912db1f95dce6eb52d781dc210db5 (diff)
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Add m-esr52 at 52.6.0
Diffstat (limited to 'accessible/windows/msaa/nsWinUtils.cpp')
-rw-r--r--accessible/windows/msaa/nsWinUtils.cpp181
1 files changed, 181 insertions, 0 deletions
diff --git a/accessible/windows/msaa/nsWinUtils.cpp b/accessible/windows/msaa/nsWinUtils.cpp
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+++ b/accessible/windows/msaa/nsWinUtils.cpp
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:expandtab:shiftwidth=2:tabstop=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 "nsWinUtils.h"
+
+#include "Compatibility.h"
+#include "DocAccessible.h"
+#include "nsAccessibilityService.h"
+#include "nsCoreUtils.h"
+
+#include "mozilla/Preferences.h"
+#include "nsArrayUtils.h"
+#include "nsIArray.h"
+#include "nsICSSDeclaration.h"
+#include "nsIDocument.h"
+#include "nsIDocShellTreeItem.h"
+#include "mozilla/dom/Element.h"
+#include "nsXULAppAPI.h"
+
+using namespace mozilla;
+using namespace mozilla::a11y;
+using mozilla::dom::Element;
+
+// Window property used by ipc related code in identifying accessible
+// tab windows.
+const wchar_t* kPropNameTabContent = L"AccessibleTabWindow";
+
+/**
+ * WindowProc to process WM_GETOBJECT messages, used in windows emulation mode.
+ */
+static LRESULT CALLBACK WindowProc(HWND hWnd, UINT msg,
+ WPARAM wParam, LPARAM lParam);
+
+bool nsWinUtils::sWindowEmulationStarted = false;
+
+already_AddRefed<nsIDOMCSSStyleDeclaration>
+nsWinUtils::GetComputedStyleDeclaration(nsIContent* aContent)
+{
+ nsIContent* elm = nsCoreUtils::GetDOMElementFor(aContent);
+ if (!elm)
+ return nullptr;
+
+ // Returns number of items in style declaration
+ nsCOMPtr<nsPIDOMWindowInner> window = elm->OwnerDoc()->GetInnerWindow();
+ if (!window)
+ return nullptr;
+
+ ErrorResult dummy;
+ nsCOMPtr<nsICSSDeclaration> cssDecl;
+ nsCOMPtr<Element> domElement(do_QueryInterface(elm));
+ cssDecl = window->GetComputedStyle(*domElement, EmptyString(), dummy);
+ nsCOMPtr<nsIDOMCSSStyleDeclaration> domDecl = do_QueryInterface(cssDecl);
+ dummy.SuppressException();
+ return domDecl.forget();
+}
+
+bool
+nsWinUtils::MaybeStartWindowEmulation()
+{
+ // Register window class that'll be used for document accessibles associated
+ // with tabs.
+ if (IPCAccessibilityActive())
+ return false;
+
+ if (Compatibility::IsJAWS() || Compatibility::IsWE() ||
+ Compatibility::IsDolphin() ||
+ XRE_IsContentProcess()) {
+ RegisterNativeWindow(kClassNameTabContent);
+ sWindowEmulationStarted = true;
+ return true;
+ }
+
+ return false;
+}
+
+void
+nsWinUtils::ShutdownWindowEmulation()
+{
+ // Unregister window call that's used for document accessibles associated
+ // with tabs.
+ if (IsWindowEmulationStarted()) {
+ ::UnregisterClassW(kClassNameTabContent, GetModuleHandle(nullptr));
+ sWindowEmulationStarted = false;
+ }
+}
+
+void
+nsWinUtils::RegisterNativeWindow(LPCWSTR aWindowClass)
+{
+ WNDCLASSW wc;
+ wc.style = CS_GLOBALCLASS;
+ wc.lpfnWndProc = WindowProc;
+ wc.cbClsExtra = 0;
+ wc.cbWndExtra = 0;
+ wc.hInstance = GetModuleHandle(nullptr);
+ wc.hIcon = nullptr;
+ wc.hCursor = nullptr;
+ wc.hbrBackground = nullptr;
+ wc.lpszMenuName = nullptr;
+ wc.lpszClassName = aWindowClass;
+ ::RegisterClassW(&wc);
+}
+
+HWND
+nsWinUtils::CreateNativeWindow(LPCWSTR aWindowClass, HWND aParentWnd,
+ int aX, int aY, int aWidth, int aHeight,
+ bool aIsActive)
+{
+ HWND hwnd = ::CreateWindowExW(WS_EX_TRANSPARENT, aWindowClass,
+ L"NetscapeDispatchWnd",
+ WS_CHILD | (aIsActive ? WS_VISIBLE : 0),
+ aX, aY, aWidth, aHeight,
+ aParentWnd,
+ nullptr,
+ GetModuleHandle(nullptr),
+ nullptr);
+ if (hwnd) {
+ // Mark this window so that ipc related code can identify it.
+ ::SetPropW(hwnd, kPropNameTabContent, (HANDLE)1);
+ }
+ return hwnd;
+}
+
+void
+nsWinUtils::ShowNativeWindow(HWND aWnd)
+{
+ ::ShowWindow(aWnd, SW_SHOW);
+}
+
+void
+nsWinUtils::HideNativeWindow(HWND aWnd)
+{
+ ::SetWindowPos(aWnd, nullptr, 0, 0, 0, 0,
+ SWP_HIDEWINDOW | SWP_NOSIZE | SWP_NOMOVE |
+ SWP_NOZORDER | SWP_NOACTIVATE);
+}
+
+LRESULT CALLBACK
+WindowProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
+{
+ // Note, this window's message handling should not invoke any call that
+ // may result in a cross-process ipc call. Doing so may violate RPC
+ // message semantics.
+
+ switch (msg) {
+ case WM_GETOBJECT:
+ {
+ // Do explicit casting to make it working on 64bit systems (see bug 649236
+ // for details).
+ int32_t objId = static_cast<DWORD>(lParam);
+ if (objId == OBJID_CLIENT) {
+ DocAccessible* document =
+ reinterpret_cast<DocAccessible*>(::GetPropW(hWnd, kPropNameDocAcc));
+ if (document) {
+ IAccessible* msaaAccessible = nullptr;
+ document->GetNativeInterface((void**)&msaaAccessible); // does an addref
+ if (msaaAccessible) {
+ LRESULT result = ::LresultFromObject(IID_IAccessible, wParam,
+ msaaAccessible); // does an addref
+ msaaAccessible->Release(); // release extra addref
+ return result;
+ }
+ }
+ }
+ return 0;
+ }
+ case WM_NCHITTEST:
+ {
+ LRESULT lRet = ::DefWindowProc(hWnd, msg, wParam, lParam);
+ if (HTCLIENT == lRet)
+ lRet = HTTRANSPARENT;
+ return lRet;
+ }
+ }
+
+ return ::DefWindowProcW(hWnd, msg, wParam, lParam);
+}