gecko-dev/accessible/src/msaa/nsWinUtils.h

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/* ***** BEGIN LICENSE BLOCK *****
 * Version: MPL 1.1/GPL 2.0/LGPL 2.1
 *
 * The contents of this file are subject to the Mozilla Public License Version
 * 1.1 (the "License"); you may not use this file except in compliance with
 * the License. You may obtain a copy of the License at
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 *
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 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the
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 *
 * The Original Code is mozilla.org code.
 *
 * The Initial Developer of the Original Code is
 * Mozilla Foundation.
 * Portions created by the Initial Developer are Copyright (C) 2009
 * the Initial Developer. All Rights Reserved.
 *
 * Contributor(s):
 *   Alexander Surkov <surkov.alexander@gmail.com> (original author)
 *
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 * either the GNU General Public License Version 2 or later (the "GPL"), or
 * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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#ifndef nsWinUtils_h_
#define nsWinUtils_h_

#include "Accessible2.h"

#include "nsIArray.h"
#include "nsIDocument.h"

const LPCWSTR kClassNameRoot = L"MozillaUIWindowClass";
const LPCWSTR kClassNameTabContent = L"MozillaContentWindowClass";

class nsWinUtils
{
public:
  /**
   * Return computed styles declaration for the given node.
   *
   * @note Please use it carefully since it can shutdown the accessible tree
   *       you operate on.
   */
  static already_AddRefed<nsIDOMCSSStyleDeclaration>
    GetComputedStyleDeclaration(nsIContent* aContent);

  /**
   * Convert nsIArray array of accessible objects to an array of IUnknown*
   * objects used in IA2 methods.
   */
  static HRESULT ConvertToIA2Array(nsIArray *aCollection,
                                   IUnknown ***aAccessibles, long *aCount);

  /**
   * Start window emulation if presence of specific AT is detected.
   */
  static bool MaybeStartWindowEmulation();

  /**
   * Free resources used for window emulation.
   */
  static void ShutdownWindowEmulation();

  /**
   * Return true if window emulation is started.
   */
  static bool IsWindowEmulationStarted();

  /**
   * Helper to register window class.
   */
  static void RegisterNativeWindow(LPCWSTR aWindowClass);

  /**
   * Helper to create a window.
   */
  static HWND CreateNativeWindow(LPCWSTR aWindowClass, HWND aParentWnd,
                                 int aX, int aY, int aWidth, int aHeight,
                                 bool aIsActive);

  /**
   * Helper to show window.
   */
  static void ShowNativeWindow(HWND aWnd);

  /**
   * Helper to hide window.
   */
  static void HideNativeWindow(HWND aWnd);
};

#endif