зеркало из https://github.com/mozilla/gecko-dev.git
107 строки
3.0 KiB
C++
107 строки
3.0 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim:expandtab:shiftwidth=2:tabstop=2:
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*/
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsWinUtils_h_
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#define nsWinUtils_h_
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#include <functional>
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#include <windows.h>
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#include "nsICSSDeclaration.h"
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#include "nsCOMPtr.h"
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class nsIContent;
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namespace mozilla {
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namespace a11y {
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class DocAccessible;
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const LPCWSTR kClassNameRoot = L"MozillaUIWindowClass";
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const LPCWSTR kClassNameTabContent = L"MozillaContentWindowClass";
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const LPCWSTR kPropNameDocAcc = L"MozDocAccessible";
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const LPCWSTR kPropNameDocAccParent = L"MozDocAccessibleParent";
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class nsWinUtils
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{
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public:
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/**
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* Return computed styles declaration for the given node.
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*
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* @note Please use it carefully since it can shutdown the accessible tree
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* you operate on.
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*/
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static already_AddRefed<nsICSSDeclaration>
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GetComputedStyleDeclaration(nsIContent* aContent);
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/**
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* Start window emulation if presence of specific AT is detected.
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*/
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static bool MaybeStartWindowEmulation();
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/**
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* Free resources used for window emulation.
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*/
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static void ShutdownWindowEmulation();
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/**
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* Return true if window emulation is started.
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*/
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static bool IsWindowEmulationStarted() { return sWindowEmulationStarted; }
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/**
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* Helper to register window class.
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*/
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static void RegisterNativeWindow(LPCWSTR aWindowClass);
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typedef std::function<void(HWND)> NativeWindowCreateProc;
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/**
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* Helper to create a window.
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*
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* NB: If additional setup needs to be done once the window has been created,
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* you should do so via aOnCreateProc. Hooks will fire during the
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* CreateNativeWindow call, thus triggering events in the AT.
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* Using aOnCreateProc guarantees that your additional initialization will
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* have completed prior to the AT receiving window creation events.
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*
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* For example:
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*
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* nsWinUtils::NativeWindowCreateProc onCreate([](HWND aHwnd) -> void {
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* DoSomeAwesomeInitializationStuff(aHwnd);
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* DoMoreAwesomeInitializationStuff(aHwnd);
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* });
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* HWND hwnd = nsWinUtils::CreateNativeWindow(..., &onCreate);
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* // Doing further initialization work to hwnd on this line is too late!
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*/
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static HWND CreateNativeWindow(LPCWSTR aWindowClass, HWND aParentWnd,
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int aX, int aY, int aWidth, int aHeight,
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bool aIsActive,
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NativeWindowCreateProc* aOnCreateProc = nullptr);
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/**
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* Helper to show window.
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*/
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static void ShowNativeWindow(HWND aWnd);
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/**
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* Helper to hide window.
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*/
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static void HideNativeWindow(HWND aWnd);
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private:
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/**
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* Flag that indicates if window emulation is started.
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*/
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static bool sWindowEmulationStarted;
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};
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} // namespace a11y
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} // namespace mozilla
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#endif
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