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      1 // Copyright (c) 2012 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_BROWSER_UI_PANELS_DISPLAY_SETTINGS_PROVIDER_WIN_H_
      6 #define CHROME_BROWSER_UI_PANELS_DISPLAY_SETTINGS_PROVIDER_WIN_H_
      7 
      8 #include "chrome/browser/ui/panels/display_settings_provider.h"
      9 
     10 #include <windows.h>
     11 #include "base/compiler_specific.h"
     12 #include "base/timer/timer.h"
     13 
     14 class DisplaySettingsProviderWin : public DisplaySettingsProvider {
     15  public:
     16   DisplaySettingsProviderWin();
     17   virtual ~DisplaySettingsProviderWin();
     18 
     19  protected:
     20   // Overridden from DisplaySettingsProvider:
     21   virtual void OnDisplaySettingsChanged() OVERRIDE;
     22   virtual bool IsAutoHidingDesktopBarEnabled(
     23       DesktopBarAlignment alignment) OVERRIDE;
     24   virtual int GetDesktopBarThickness(
     25       DesktopBarAlignment alignment) const OVERRIDE;
     26   virtual DesktopBarVisibility GetDesktopBarVisibility(
     27       DesktopBarAlignment alignment) const OVERRIDE;
     28 
     29   int GetDesktopBarThicknessFromBounds(
     30       DesktopBarAlignment alignment, const gfx::Rect& taskbar_bounds) const;
     31   DesktopBarVisibility GetDesktopBarVisibilityFromBounds(
     32       DesktopBarAlignment alignment, const gfx::Rect& taskbar_bounds) const;
     33 
     34  private:
     35   struct Taskbar {
     36     HWND window;
     37     DesktopBarVisibility visibility;
     38     int thickness;
     39   };
     40 
     41   // Callback to perform periodic check for taskbar changes.
     42   void OnPollingTimer();
     43 
     44   // Returns true if there is at least one auto-hiding taskbar found.
     45   bool CheckTaskbars(bool notify_observer);
     46 
     47   gfx::Rect GetBounds(DesktopBarAlignment alignment) const;
     48 
     49   // Maximum number of taskbars we're interested in: bottom, left, and right.
     50   static const int kMaxTaskbars = 3;
     51 
     52   HMONITOR monitor_;
     53   Taskbar taskbars_[kMaxTaskbars];
     54   base::RepeatingTimer<DisplaySettingsProviderWin> polling_timer_;
     55 
     56   DISALLOW_COPY_AND_ASSIGN(DisplaySettingsProviderWin);
     57 };
     58 
     59 #endif  // CHROME_BROWSER_UI_PANELS_DISPLAY_SETTINGS_PROVIDER_WIN_H_
     60