chrome_frame/bho_loader.h

   1 // Copyright (c) 2010 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CHROME_FRAME_BHO_LOADER_H_
   6 #define CHROME_FRAME_BHO_LOADER_H_
   7
   8 #include <windows.h>
   9
  10 // Forward.
  11 class EventHooker;
  12
  13 // This class simulates BHO loading in an IE process. It watches for the
  14 // creation of a specific window and then retrieves the web browser object
  15 // for that window and simulates loading of the BHO.
  16 class BHOLoader {
  17  public:
  18   BHOLoader();
  19   ~BHOLoader();
  20
  21   // Callback invoked on receipt of an accessibility event.
  22   void OnHookEvent(DWORD event, HWND window);
  23
  24   // Call this to install event hooks that will trigger on window creation
  25   // and reparenting. Returns true if the hooks are successfully installed,
  26   // false otherwise.
  27   bool StartHook();
  28
  29   // Call this to remove the event hooks that are installed by StartHook().
  30   void StopHook();
  31
  32   // Retrieve the BHOLoader instance. Note that this is NOT thread-safe.
  33   static BHOLoader* GetInstance();
  34
  35  private:
  36   EventHooker* hooker_;
  37 };
  38
  39 #endif  // CHROME_FRAME_BHO_LOADER_H_