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 nsresult
  50 nsHTMLWin32ObjectOwnerAccessible::Shutdown()
  51 {
  52   nsAccessibleWrap::Shutdown();
  53   mNativeAccessible = nsnull;
  54   return NS_OK;
  55 }
  56
  57 /**
  58   * Our only child is a nsHTMLWin32ObjectAccessible
  59   */
  60 NS_IMETHODIMP nsHTMLWin32ObjectOwnerAccessible::GetFirstChild(nsIAccessible **aFirstChild)
  61 {
  62   *aFirstChild = mNativeAccessible;
  63   if (!mNativeAccessible) {
  64     if (!mHwnd) {
  65       return NS_OK;
  66     }
  67     mNativeAccessible = new nsHTMLWin32ObjectAccessible(mHwnd) ;
  68     SetFirstChild(mNativeAccessible);
  69     *aFirstChild = mNativeAccessible;
  70   }
  71   NS_IF_ADDREF(*aFirstChild);
  72   return NS_OK;
  73 }
  74
  75 NS_IMETHODIMP nsHTMLWin32ObjectOwnerAccessible::GetLastChild(nsIAccessible **aLastChild)
  76 {
  77   return GetFirstChild(aLastChild);
  78 }
  79
  80 NS_IMETHODIMP nsHTMLWin32ObjectOwnerAccessible::GetChildCount(PRInt32 *aChildCount)
  81 {
  82   nsCOMPtr<nsIAccessible> onlyChild;
  83   GetFirstChild(getter_AddRefs(onlyChild));
  84   *aChildCount = onlyChild ? 1 : 0;
  85   return NS_OK;
  86 }
  87
  88 nsHTMLWin32ObjectAccessible::nsHTMLWin32ObjectAccessible(void* aHwnd):
  89 nsLeafAccessible(nsnull, nsnull)
  90 {
  91   mHwnd = aHwnd;
  92   if (mHwnd) {
  93     // The plugin is not windowless. In this situation we use
  94     // use its inner child owned by the plugin so that we don't get
  95     // in an infinite loop, where the WM_GETOBJECT's get forwarded
  96     // back to us and create another nsHTMLWin32ObjectAccessible
  97     HWND childWnd = ::GetWindow((HWND)aHwnd, GW_CHILD);
  98     if (childWnd) {
  99       mHwnd = childWnd;
 100     }
 101   }
 102 }
 103
 104 NS_IMPL_ISUPPORTS_INHERITED1(nsHTMLWin32ObjectAccessible, nsAccessible, nsIAccessibleWin32Object)
 105
 106 NS_IMETHODIMP nsHTMLWin32ObjectAccessible::GetHwnd(void **aHwnd)
 107 {
 108   *aHwnd = mHwnd;
 109   return NS_OK;
 110 }
 111