chrome_frame/infobars/internal/host_window_manager.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_INFOBARS_INTERNAL_HOST_WINDOW_MANAGER_H_
   6 #define CHROME_FRAME_INFOBARS_INTERNAL_HOST_WINDOW_MANAGER_H_
   7
   8 #include "base/basictypes.h"
   9 #include "chrome_frame/infobars/internal/subclassing_window_with_delegate.h"
  10
  11 class DisplacedWindowManager;
  12
  13 // HostWindowManager observes the HWND passed to Initialize and:
  14 // 1) Monitors the lifecycle of a specific child window (as identified by
  15 //    FindDisplacedWindow).
  16 // 2) Intercepts NCCALCSIZE events on the child window, allowing the client to
  17 //    modify the child window's requested dimensions.
  18 // 3) Allows the client to request a recalculation of the child window's
  19 //    dimensions (resulting in a callback as in [2]).
  20 //
  21 // See documentation of SubclasingWindowWithDelegate for further information.
  22 class HostWindowManager
  23     : public SubclassingWindowWithDelegate<HostWindowManager> {
  24  public:
  25   HostWindowManager();
  26   virtual ~HostWindowManager();
  27
  28   // Triggers an immediate re-evaluation of the dimensions of the displaced
  29   // window. Delegate::AdjustDisplacedWindowDimensions will be called with the
  30   // natural dimensions of the displaced window.
  31   void UpdateLayout();
  32
  33  private:
  34   class DisplacedWindowDelegate;
  35   friend class DisplacedWindowDelegate;
  36
  37   // Finds the window to be displaced and instantiate a DisplacedWindowManager
  38   // for it if one does not already exist. Returns true if
  39   // displaced_window_manager_ is non-NULL at the end of the call.
  40   bool FindDisplacedWindow(HWND old_window);
  41
  42   // Subclasses and observes changes to the displaced window.
  43   DisplacedWindowManager* displaced_window_manager_;
  44
  45   DISALLOW_COPY_AND_ASSIGN(HostWindowManager);
  46 };  // class HostWindowManager
  47
  48 #endif  // CHROME_FRAME_INFOBARS_INTERNAL_HOST_WINDOW_MANAGER_H_