accessible/src/msaa/nsHTMLWin32ObjectAccessible.cpp
author Alex Keybl <akeybl@mozilla.com>
Tue, 31 Jan 2012 10:17:43 -0800
changeset 88717 801015738a123a86458eba7e4f0b3f4bae3a668e
parent 86717 0ef29ddd07e54d636e64586bc09130e1f315a3e9
child 88750 38607065cf3f4eb9457c4a1b4825701961e44f6d
permissions -rw-r--r--
Added tag AURORA_BASE_20120131 for changeset bbc7014db2de

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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 * Contributor(s):
 *   John Gaunt (jgaunt@netscape.com) (original author)
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#include "nsHTMLWin32ObjectAccessible.h"

#include "Role.h"
#include "States.h"

using namespace mozilla::a11y;

////////////////////////////////////////////////////////////////////////////////
// nsHTMLWin32ObjectOwnerAccessible
////////////////////////////////////////////////////////////////////////////////

nsHTMLWin32ObjectOwnerAccessible::
  nsHTMLWin32ObjectOwnerAccessible(nsIContent *aContent,
                                   nsIWeakReference *aShell, void *aHwnd) :
  nsAccessibleWrap(aContent, aShell), mHwnd(aHwnd)
{
  // Our only child is a nsHTMLWin32ObjectAccessible object.
  mNativeAccessible = new nsHTMLWin32ObjectAccessible(mHwnd);
}

////////////////////////////////////////////////////////////////////////////////
// nsHTMLWin32ObjectOwnerAccessible: nsAccessNode implementation

void
nsHTMLWin32ObjectOwnerAccessible::Shutdown()
{
  nsAccessibleWrap::Shutdown();
  mNativeAccessible = nsnull;
}

////////////////////////////////////////////////////////////////////////////////
// nsHTMLWin32ObjectOwnerAccessible: nsAccessible implementation

role
nsHTMLWin32ObjectOwnerAccessible::NativeRole()
{
  return roles::EMBEDDED_OBJECT;
}

PRUint64
nsHTMLWin32ObjectOwnerAccessible::NativeState()
{
  // XXX: No HWND means this is windowless plugin which is not accessible in
  // the meantime.
  return mHwnd ? nsAccessibleWrap::NativeState() : states::UNAVAILABLE;
}

////////////////////////////////////////////////////////////////////////////////
// nsHTMLWin32ObjectOwnerAccessible: nsAccessible protected implementation

void
nsHTMLWin32ObjectOwnerAccessible::CacheChildren()
{
  if (mNativeAccessible)
    AppendChild(mNativeAccessible);
}


////////////////////////////////////////////////////////////////////////////////
// nsHTMLWin32ObjectAccessible
////////////////////////////////////////////////////////////////////////////////

nsHTMLWin32ObjectAccessible::nsHTMLWin32ObjectAccessible(void* aHwnd):
nsLeafAccessible(nsnull, nsnull)
{
  mHwnd = aHwnd;
  if (mHwnd) {
    // The plugin is not windowless. In this situation we use 
    // use its inner child owned by the plugin so that we don't get
    // in an infinite loop, where the WM_GETOBJECT's get forwarded
    // back to us and create another nsHTMLWin32ObjectAccessible
    HWND childWnd = ::GetWindow((HWND)aHwnd, GW_CHILD);
    if (childWnd) {
      mHwnd = childWnd;
    }
  }
}

NS_IMPL_ISUPPORTS_INHERITED1(nsHTMLWin32ObjectAccessible, nsAccessible, nsIAccessibleWin32Object)

NS_IMETHODIMP nsHTMLWin32ObjectAccessible::GetHwnd(void **aHwnd) 
{
  *aHwnd = mHwnd;
  return NS_OK;
}