chrome_frame/infobars/internal/infobar_window.h

   1 // Copyright (c) 2011 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_INFOBAR_WINDOW_H_
   6 #define CHROME_FRAME_INFOBARS_INTERNAL_INFOBAR_WINDOW_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "base/time.h"
  11
  12 #include "chrome_frame/infobars/infobar_content.h"
  13 #include "chrome_frame/infobars/infobar_manager.h"
  14
  15 struct FunctionStub;
  16
  17 // Manages the display of an InfobarContent instance within a container window.
  18 // Positions the infobar content by displacing other "natural" content of the
  19 // window (see ReserveSpace). Allows positioning either above or below the
  20 // natural content.
  21 class InfobarWindow {
  22  public:
  23   // Integrates the InfobarWindow with its environment.
  24   class Host {
  25    public:
  26     virtual ~Host() {}
  27
  28     // Returns a handle to the window within which infobar content should be
  29     // created. All windows associated with the infobar content should be
  30     // descendants of the container window.
  31     virtual HWND GetContainerWindow() = 0;
  32
  33     // Triggers an immediate re-evaluation of the dimensions of the displaced
  34     // content. InfobarWindow::ReserveSpace will be called with the natural
  35     // dimensions of the displaced content.
  36     virtual void UpdateLayout() = 0;
  37   };  // class Host
  38
  39   explicit InfobarWindow(InfobarType type);
  40   ~InfobarWindow();
  41
  42   void SetHost(Host* host);
  43
  44   // Shows the supplied content in this InfobarWindow. Normally,
  45   // InfobarContent::InstallInFrame will be called with an InfobarContent::Frame
  46   // instance the content may use to interact with the InfobarWindow.
  47   //
  48   // InfobarContent is deleted when the InfobarWindow is finished with the
  49   // content (either through failure or when successfully hidden).
  50   bool Show(InfobarContent* content);
  51
  52   // Hides the infobar.
  53   void Hide();
  54
  55   // Receives the total space requested by the displaced content and subtracts
  56   // any space required by this infobar. Passes the reserved dimensions to
  57   // InfobarContent::SetDimensions.
  58   void ReserveSpace(RECT* rect);
  59
  60  private:
  61   // Provides InfobarContent with access to this InfobarWindow.
  62   class FrameImpl : public InfobarContent::Frame {
  63    public:
  64     explicit FrameImpl(InfobarWindow* infobar_window);
  65
  66     // InfobarContent::Frame implementation
  67     virtual HWND GetFrameWindow();
  68     virtual void CloseInfobar();
  69
  70    private:
  71     InfobarWindow* infobar_window_;
  72     DISALLOW_COPY_AND_ASSIGN(FrameImpl);
  73   };  // class FrameImpl
  74
  75   // Sets up our state to show or hide and calls Host::UpdateLayout to cause a
  76   // call to ReserveSpace. Sets up a timer to periodically call UpdateLayout.
  77   void StartSlidingTowards(int height);
  78
  79   // Based on the initial height, how long (and if) we have been sliding, and
  80   // the target height, decides what the current height should be.
  81   int CalculateHeight();
  82
  83   // Manage a timer that repeatedly calls Host::UpdateLayout
  84   bool StartTimer();
  85   bool StopTimer();
  86
  87   scoped_ptr<InfobarContent> content_;
  88   Host* host_;
  89   FrameImpl frame_impl_;
  90   InfobarType type_;
  91   int current_width_;
  92   int current_height_;
  93
  94   // These variables control our state for sliding and are used to calculate
  95   // the desired height at any given time.
  96   base::Time slide_start_;  // When we started sliding, or the null time if we
  97                             // are not sliding.
  98   int initial_height_;      // Where we started sliding from
  99   int target_height_;       // Where we are sliding to
 100
 101   // ID and thunk for the slide-effect timer
 102   int timer_id_;
 103   FunctionStub* timer_stub_;
 104
 105   DISALLOW_COPY_AND_ASSIGN(InfobarWindow);
 106 };  // class InfobarWindow
 107
 108 #endif  // CHROME_FRAME_INFOBARS_INTERNAL_INFOBAR_WINDOW_H_