gecko/widget/shared/WidgetUtils.cpp

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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 * The Original Code is the Mozilla browser.
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 * The Initial Developer of the Original Code is
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 * Contributor(s):
 *   Stuart Parmenter <pavlov@netscape.com>
 *   Mike Pinkerton   <pinkerton@netscape.com>
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#include "WidgetUtils.h"

#include "nsIBaseWindow.h"
#include "nsIDocShellTreeItem.h"
#include "nsIDocShell.h"
#include "nsIInterfaceRequestorUtils.h"

namespace mozilla {
namespace widget {

//static
already_AddRefed<nsIWidget>
WidgetUtils::DOMWindowToWidget(nsIDOMWindow *aDOMWindow)
{
  nsCOMPtr<nsIWidget> widget;

  nsCOMPtr<nsPIDOMWindow> window = do_QueryInterface(aDOMWindow);
  if (window) {
    nsCOMPtr<nsIBaseWindow> baseWin(do_QueryInterface(window->GetDocShell()));

    while (!widget && baseWin) {
      baseWin->GetParentWidget(getter_AddRefs(widget));
      if (!widget) {
        nsCOMPtr<nsIDocShellTreeItem> docShellAsItem(do_QueryInterface(baseWin));
        if (!docShellAsItem)
          return nsnull;

        nsCOMPtr<nsIDocShellTreeItem> parent;
        docShellAsItem->GetParent(getter_AddRefs(parent));

        window = do_GetInterface(parent);
        if (!window)
          return nsnull;

        baseWin = do_QueryInterface(window->GetDocShell());
      }
    }
  }

  return widget.forget();
}

} // namespace widget
} // namespace mozilla