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lightning-sunbird  0.9+nobinonly
nsHTMLWin32ObjectAccessible.cpp
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00001 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
00003  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00004  *
00005  * The contents of this file are subject to the Mozilla Public License Version
00006  * 1.1 (the "License"); you may not use this file except in compliance with
00007  * the License. You may obtain a copy of the License at
00008  * http://www.mozilla.org/MPL/
00009  *
00010  * Software distributed under the License is distributed on an "AS IS" basis,
00011  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00012  * for the specific language governing rights and limitations under the
00013  * License.
00014  *
00015  * The Original Code is mozilla.org code.
00016  *
00017  * The Initial Developer of the Original Code is
00018  * Netscape Communications Corporation.
00019  * Portions created by the Initial Developer are Copyright (C) 1998
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *   John Gaunt (jgaunt@netscape.com) (original author)
00024  *
00025  * Alternatively, the contents of this file may be used under the terms of
00026  * either of the GNU General Public License Version 2 or later (the "GPL"),
00027  * or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
00028  * in which case the provisions of the GPL or the LGPL are applicable instead
00029  * of those above. If you wish to allow use of your version of this file only
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00036  *
00037  * ***** END LICENSE BLOCK ***** */
00038 
00039 #include "nsHTMLWin32ObjectAccessible.h"
00040 #include "nsAccessibleWrap.h"
00041 
00042 
00043 nsHTMLWin32ObjectOwnerAccessible::nsHTMLWin32ObjectOwnerAccessible(nsIDOMNode* aNode, nsIWeakReference* aShell, void* aHwnd):
00044 nsAccessibleWrap(aNode, aShell)
00045 {
00046   mHwnd = aHwnd;
00047 }
00048 
00049 NS_IMETHODIMP nsHTMLWin32ObjectOwnerAccessible::Shutdown()
00050 {
00051   nsAccessibleWrap::Shutdown();
00052   mNativeAccessible = nsnull;
00053   return NS_OK;
00054 }
00055 
00059 NS_IMETHODIMP nsHTMLWin32ObjectOwnerAccessible::GetFirstChild(nsIAccessible **aFirstChild)
00060 {
00061   *aFirstChild = mNativeAccessible;
00062   if (!mNativeAccessible) {
00063     if (!mHwnd) {
00064       return NS_OK;
00065     }
00066     mNativeAccessible = new nsHTMLWin32ObjectAccessible(mHwnd) ;
00067     SetFirstChild(mNativeAccessible);
00068     *aFirstChild = mNativeAccessible;
00069   }
00070   NS_IF_ADDREF(*aFirstChild);
00071   return NS_OK;
00072 }
00073 
00074 NS_IMETHODIMP nsHTMLWin32ObjectOwnerAccessible::GetLastChild(nsIAccessible **aLastChild)
00075 {
00076   return GetFirstChild(aLastChild);
00077 }
00078 
00079 NS_IMETHODIMP nsHTMLWin32ObjectOwnerAccessible::GetChildCount(PRInt32 *aChildCount)
00080 {
00081   nsCOMPtr<nsIAccessible> onlyChild;
00082   GetFirstChild(getter_AddRefs(onlyChild));
00083   *aChildCount = onlyChild ? 1 : 0;
00084   return NS_OK;
00085 }
00086 
00087 nsHTMLWin32ObjectAccessible::nsHTMLWin32ObjectAccessible(void* aHwnd):
00088 nsLeafAccessible(nsnull, nsnull)
00089 {
00090   mHwnd = aHwnd;
00091   if (mHwnd) {
00092     // The plugin is not windowless. In this situation we use 
00093     // use its inner child owned by the plugin so that we don't get
00094     // in an infinite loop, where the WM_GETOBJECT's get forwarded
00095     // back to us and create another nsHTMLWin32ObjectAccessible
00096     HWND childWnd = ::GetWindow((HWND)aHwnd, GW_CHILD);
00097     if (childWnd) {
00098       mHwnd = childWnd;
00099     }
00100   }
00101 }
00102 
00103 NS_IMPL_ISUPPORTS_INHERITED1(nsHTMLWin32ObjectAccessible, nsAccessible, nsIAccessibleWin32Object)
00104 
00105 NS_IMETHODIMP nsHTMLWin32ObjectAccessible::GetHwnd(void **aHwnd) 
00106 {
00107   *aHwnd = mHwnd;
00108   return NS_OK;
00109 }
00110