ash/desktop_background/desktop_background_controller.h

   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 ASH_DESKTOP_BACKGROUND_DESKTOP_BACKGROUND_CONTROLLER_H_
   6 #define ASH_DESKTOP_BACKGROUND_DESKTOP_BACKGROUND_CONTROLLER_H_
   7
   8 #include "ash/ash_export.h"
   9 #include "ash/display/window_tree_host_manager.h"
  10 #include "ash/shell_observer.h"
  11 #include "base/basictypes.h"
  12 #include "base/files/file_path.h"
  13 #include "base/gtest_prod_util.h"
  14 #include "base/memory/scoped_ptr.h"
  15 #include "base/memory/weak_ptr.h"
  16 #include "base/observer_list.h"
  17 #include "base/timer/timer.h"
  18 #include "components/wallpaper/wallpaper_layout.h"
  19 #include "ui/compositor/layer.h"
  20 #include "ui/gfx/image/image_skia.h"
  21
  22 typedef unsigned int SkColor;
  23
  24 namespace aura {
  25 class Window;
  26 }
  27
  28 namespace wallpaper {
  29 class WallpaperResizer;
  30 }
  31
  32 namespace ash {
  33
  34 const SkColor kLoginWallpaperColor = 0xFEFEFE;
  35
  36 class DesktopBackgroundControllerObserver;
  37
  38 // Updates background layer if necessary.
  39 class ASH_EXPORT DesktopBackgroundController
  40     : public WindowTreeHostManager::Observer,
  41       public ShellObserver {
  42  public:
  43   class TestAPI;
  44
  45   enum BackgroundMode {
  46     BACKGROUND_NONE,
  47     BACKGROUND_IMAGE,
  48   };
  49
  50   DesktopBackgroundController();
  51   ~DesktopBackgroundController() override;
  52
  53   BackgroundMode desktop_background_mode() const {
  54     return desktop_background_mode_;
  55   }
  56
  57   // Add/Remove observers.
  58   void AddObserver(DesktopBackgroundControllerObserver* observer);
  59   void RemoveObserver(DesktopBackgroundControllerObserver* observer);
  60
  61   // Provides current image on the background, or empty gfx::ImageSkia if there
  62   // is no image, e.g. background is none.
  63   gfx::ImageSkia GetWallpaper() const;
  64
  65   wallpaper::WallpaperLayout GetWallpaperLayout() const;
  66
  67   // Sets wallpaper. This is mostly called by WallpaperManager to set
  68   // the default or user selected custom wallpaper.
  69   // Returns true if new image was actually set. And false when duplicate set
  70   // request detected.
  71   bool SetWallpaperImage(const gfx::ImageSkia& image,
  72                          wallpaper::WallpaperLayout layout);
  73
  74   // Creates an empty wallpaper. Some tests require a wallpaper widget is ready
  75   // when running. However, the wallpaper widgets are now created
  76   // asynchronously. If loading a real wallpaper, there are cases that these
  77   // tests crash because the required widget is not ready. This function
  78   // synchronously creates an empty widget for those tests to prevent
  79   // crashes. An example test is SystemGestureEventFilterTest.ThreeFingerSwipe.
  80   void CreateEmptyWallpaper();
  81
  82   // Move all desktop widgets to locked container.
  83   // Returns true if the desktop moved.
  84   bool MoveDesktopToLockedContainer();
  85
  86   // Move all desktop widgets to unlocked container.
  87   // Returns true if the desktop moved.
  88   bool MoveDesktopToUnlockedContainer();
  89
  90   // WindowTreeHostManager::Observer:
  91   void OnDisplayConfigurationChanged() override;
  92
  93   // ShellObserver:
  94   void OnRootWindowAdded(aura::Window* root_window) override;
  95
  96   // Returns the maximum size of all displays combined in native
  97   // resolutions.  Note that this isn't the bounds of the display who
  98   // has maximum resolutions. Instead, this returns the size of the
  99   // maximum width of all displays, and the maximum height of all displays.
 100   static gfx::Size GetMaxDisplaySizeInNative();
 101
 102   // Returns true if the specified wallpaper is already stored
 103   // in |current_wallpaper_|.
 104   // If |compare_layouts| is false, layout is ignored.
 105   bool WallpaperIsAlreadyLoaded(const gfx::ImageSkia& image,
 106                                 bool compare_layouts,
 107                                 wallpaper::WallpaperLayout layout) const;
 108
 109  private:
 110   friend class DesktopBackgroundControllerTest;
 111   //  friend class chromeos::WallpaperManagerBrowserTestDefaultWallpaper;
 112   FRIEND_TEST_ALL_PREFIXES(DesktopBackgroundControllerTest, GetMaxDisplaySize);
 113
 114   // Creates view for all root windows, or notifies them to repaint if they
 115   // already exist.
 116   void SetDesktopBackgroundImageMode();
 117
 118   // Creates and adds component for current mode (either Widget or Layer) to
 119   // |root_window|.
 120   void InstallDesktopController(aura::Window* root_window);
 121
 122   // Creates and adds component for current mode (either Widget or Layer) to
 123   // all root windows.
 124   void InstallDesktopControllerForAllWindows();
 125
 126   // Moves all desktop components from one container to other across all root
 127   // windows. Returns true if a desktop moved.
 128   bool ReparentBackgroundWidgets(int src_container, int dst_container);
 129
 130   // Returns id for background container for unlocked and locked states.
 131   int GetBackgroundContainerId(bool locked);
 132
 133   // Send notification that background animation finished.
 134   void NotifyAnimationFinished();
 135
 136   // Reload the wallpaper. |clear_cache| specifies whether to clear the
 137   // wallpaper cahce or not.
 138   void UpdateWallpaper(bool clear_cache);
 139
 140   void set_wallpaper_reload_delay_for_test(bool value) {
 141     wallpaper_reload_delay_ = value;
 142   }
 143
 144   // Can change at runtime.
 145   bool locked_;
 146
 147   BackgroundMode desktop_background_mode_;
 148
 149   SkColor background_color_;
 150
 151   base::ObserverList<DesktopBackgroundControllerObserver> observers_;
 152
 153   // The current wallpaper.
 154   scoped_ptr<wallpaper::WallpaperResizer> current_wallpaper_;
 155
 156   gfx::Size current_max_display_size_;
 157
 158   base::OneShotTimer<DesktopBackgroundController> timer_;
 159
 160   int wallpaper_reload_delay_;
 161
 162   DISALLOW_COPY_AND_ASSIGN(DesktopBackgroundController);
 163 };
 164
 165 }  // namespace ash
 166
 167 #endif  // ASH_DESKTOP_BACKGROUND_DESKTOP_BACKGROUND_CONTROLLER_H_