accessible/src/msaa/nsHTMLWin32ObjectAccessible.cpp

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   3  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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  15  * The Original Code is mozilla.org code.
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  19  * Portions created by the Initial Developer are Copyright (C) 1998
  20  * the Initial Developer. All Rights Reserved.
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  22  * Contributor(s):
  23  *   John Gaunt (jgaunt@netscape.com) (original author)
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  25  * Alternatively, the contents of this file may be used under the terms of
  26  * either of the GNU General Public License Version 2 or later (the "GPL"),
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  37  * ***** END LICENSE BLOCK ***** */
  38
  39 #include "nsHTMLWin32ObjectAccessible.h"
  40 #include "nsAccessibleWrap.h"
  41
  42
  43 nsHTMLWin32ObjectOwnerAccessible::nsHTMLWin32ObjectOwnerAccessible(nsIDOMNode* aNode, nsIWeakReference* aShell, void* aHwnd):
  44 nsAccessibleWrap(aNode, aShell)
  45 {
  46   mHwnd = aHwnd;
  47 }
  48
  49 NS_IMETHODIMP nsHTMLWin32ObjectOwnerAccessible::Shutdown()
  50 {
  51   nsAccessibleWrap::Shutdown();
  52   mNativeAccessible = nsnull;
  53   return NS_OK;
  54 }
  55
  56 /**
  57   * Our only child is a nsHTMLWin32ObjectAccessible
  58   */
  59 NS_IMETHODIMP nsHTMLWin32ObjectOwnerAccessible::GetFirstChild(nsIAccessible **aFirstChild)
  60 {
  61   *aFirstChild = mNativeAccessible;
  62   if (!mNativeAccessible) {
  63     if (!mHwnd) {
  64       return NS_OK;
  65     }
  66     mNativeAccessible = new nsHTMLWin32ObjectAccessible(mHwnd) ;
  67     SetFirstChild(mNativeAccessible);
  68     *aFirstChild = mNativeAccessible;
  69   }
  70   NS_IF_ADDREF(*aFirstChild);
  71   return NS_OK;
  72 }
  73
  74 NS_IMETHODIMP nsHTMLWin32ObjectOwnerAccessible::GetLastChild(nsIAccessible **aLastChild)
  75 {
  76   return GetFirstChild(aLastChild);
  77 }
  78
  79 NS_IMETHODIMP nsHTMLWin32ObjectOwnerAccessible::GetChildCount(PRInt32 *aChildCount)
  80 {
  81   nsCOMPtr<nsIAccessible> onlyChild;
  82   GetFirstChild(getter_AddRefs(onlyChild));
  83   *aChildCount = onlyChild ? 1 : 0;
  84   return NS_OK;
  85 }
  86
  87 nsHTMLWin32ObjectAccessible::nsHTMLWin32ObjectAccessible(void* aHwnd):
  88 nsLeafAccessible(nsnull, nsnull)
  89 {
  90   mHwnd = aHwnd;
  91   if (mHwnd) {
  92     // The plugin is not windowless. In this situation we use
  93     // use its inner child owned by the plugin so that we don't get
  94     // in an infinite loop, where the WM_GETOBJECT's get forwarded
  95     // back to us and create another nsHTMLWin32ObjectAccessible
  96     HWND childWnd = ::GetWindow((HWND)aHwnd, GW_CHILD);
  97     if (childWnd) {
  98       mHwnd = childWnd;
  99     }
 100   }
 101 }
 102
 103 NS_IMPL_ISUPPORTS_INHERITED1(nsHTMLWin32ObjectAccessible, nsAccessible, nsIAccessibleWin32Object)
 104
 105 NS_IMETHODIMP nsHTMLWin32ObjectAccessible::GetHwnd(void **aHwnd)
 106 {
 107   *aHwnd = mHwnd;
 108   return NS_OK;
 109 }
 110