Remove implementation of Panels on OSes other than ChromeOS.

chrome/browser/ui/panels/display_settings_provider.h

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#ifndef CHROME_BROWSER_UI_PANELS_DISPLAY_SETTINGS_PROVIDER_H_
-#define CHROME_BROWSER_UI_PANELS_DISPLAY_SETTINGS_PROVIDER_H_
-
-#include "base/macros.h"
-#include "base/observer_list.h"
-#include "base/timer/timer.h"
-#include "ui/gfx/geometry/rect.h"
-
-// Encapsulates the logic to provide display settings support, including the
-// information for:
-// 1) Work area
-// 2) Auto-hiding desktop bars, like Windows taskbar and MacOSX dock.
-class DisplaySettingsProvider {
- public:
-  // Indicates which screen edge the desktop bar is aligned to.
-  // We do not care about the desktop aligned to the top screen edge.
-  enum DesktopBarAlignment {
-    DESKTOP_BAR_ALIGNED_BOTTOM = 0,
-    DESKTOP_BAR_ALIGNED_LEFT = 1,
-    DESKTOP_BAR_ALIGNED_RIGHT = 2
-  };
-
-  // Indicates current visibility state of the desktop bar.
-  enum DesktopBarVisibility {
-    DESKTOP_BAR_VISIBLE,
-    DESKTOP_BAR_ANIMATING,
-    DESKTOP_BAR_HIDDEN
-  };
-
-  class DisplayObserver {
-   public:
-    virtual void OnDisplayChanged() = 0;
-  };
-
-  class DesktopBarObserver {
-   public:
-    virtual void OnAutoHidingDesktopBarVisibilityChanged(
-        DesktopBarAlignment alignment, DesktopBarVisibility visibility) = 0;
-    virtual void OnAutoHidingDesktopBarThicknessChanged(
-        DesktopBarAlignment alignment, int thickness) = 0;
-  };
-
-  class FullScreenObserver {
-   public:
-    virtual void OnFullScreenModeChanged(bool is_full_screen) = 0;
-  };
-
-  static DisplaySettingsProvider* Create();
-
-  virtual ~DisplaySettingsProvider();
-
-  // Subscribes/unsubscribes from the display settings change notification.
-  void AddDisplayObserver(DisplayObserver* observer);
-  void RemoveDisplayObserver(DisplayObserver* observer);
-
-  void AddDesktopBarObserver(DesktopBarObserver* observer);
-  void RemoveDesktopBarObserver(DesktopBarObserver* observer);
-
-  void AddFullScreenObserver(FullScreenObserver* observer);
-  void RemoveFullScreenObserver(FullScreenObserver* observer);
-
-  //
-  // Display Area:
-  //   This is the area of a display (monitor). There could be multiple display
-  //   areas.
-  // Work Area:
-  //   This is the standard work area returned by the system. It is usually
-  //   computed by the system as the part of display area that excludes
-  //   top-most system menu or bars aligned to the screen edges.
-  //
-
-  // Returns the bounds of primary display.
-  virtual gfx::Rect GetPrimaryDisplayArea() const;
-
-  // Returns the bounds of the work area of primary display.
-  virtual gfx::Rect GetPrimaryWorkArea() const;
-
-  // Returns the bounds of the display area that most closely intersects the
-  // provided bounds.
-  virtual gfx::Rect GetDisplayAreaMatching(const gfx::Rect& bounds) const;
-
-  // Returns the bounds of the work area that most closely intersects the
-  // provided bounds.
-  virtual gfx::Rect GetWorkAreaMatching(const gfx::Rect& bounds) const;
-
-  // Invoked when the display settings has changed, due to any of the following:
-  // 1) screen resolution changes
-  // 2) the thickness of desktop bar changes
-  // 3) desktop bar switches between auto-hiding and non-auto-hiding
-  virtual void OnDisplaySettingsChanged();
-
-  // Returns true if there is a desktop bar that is aligned to the specified
-  // screen edge and set to auto-hide.
-  virtual bool IsAutoHidingDesktopBarEnabled(DesktopBarAlignment alignment);
-
-  // Returns the thickness of the desktop bar that is aligned to the specified
-  // screen edge, when it is visible. When the desktop bar is aligned to bottom
-  // edge, this is the height of the bar. If the desktop bar is aligned to
-  // left or right edge, this is the width of the bar.
-  virtual int GetDesktopBarThickness(DesktopBarAlignment alignment) const;
-
-  // Returns the visibility state of the desktop bar that is aligned to the
-  // specified screen edge.
-  virtual DesktopBarVisibility GetDesktopBarVisibility(
-      DesktopBarAlignment alignment) const;
-
-  base::ObserverList<DisplayObserver>& display_observers() {
-    return display_observers_;
-  }
-
-  base::ObserverList<DesktopBarObserver>& desktop_bar_observers() {
-    return desktop_bar_observers_;
-  }
-
-  base::ObserverList<FullScreenObserver>& full_screen_observers() {
-    return full_screen_observers_;
-  }
-
-  bool is_full_screen() const { return is_full_screen_; }
-
- protected:
-  enum FullScreenCheckMode {
-    ASSUME_FULLSCREEN_ON,
-    ASSUME_FULLSCREEN_OFF,
-    PERFORM_FULLSCREEN_CHECK
-  };
-
-  DisplaySettingsProvider();
-
-  // Returns true if we need to perform fullscreen check periodically.
-  virtual bool NeedsPeriodicFullScreenCheck() const;
-
-  // Returns true if full screen or presentation mode in main screen is entered.
-  virtual bool IsFullScreen();
-
-  // Callback to perform periodic check for full screen mode changes.
-  void CheckFullScreenMode(FullScreenCheckMode check_mode);
-
- private:
-  // Observers that listen to various display settings changes.
-  base::ObserverList<DisplayObserver> display_observers_;
-  base::ObserverList<DesktopBarObserver> desktop_bar_observers_;
-  base::ObserverList<FullScreenObserver> full_screen_observers_;
-
-  // True if full screen mode or presentation mode is entered.
-  bool is_full_screen_;
-
-  // Timer used to detect full-screen mode change.
-  base::RepeatingTimer full_screen_mode_timer_;
-
-  DISALLOW_COPY_AND_ASSIGN(DisplaySettingsProvider);
-};
-
-#endif  // CHROME_BROWSER_UI_PANELS_DISPLAY_SETTINGS_PROVIDER_H_