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// 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 ASH_DESKTOP_BACKGROUND_DESKTOP_BACKGROUND_CONTROLLER_H_
#define ASH_DESKTOP_BACKGROUND_DESKTOP_BACKGROUND_CONTROLLER_H_
#include "ash/ash_export.h"
#include "ash/display/display_controller.h"
#include "ash/shell_observer.h"
#include "base/basictypes.h"
#include "base/files/file_path.h"
#include "base/gtest_prod_util.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/observer_list.h"
#include "base/timer/timer.h"
#include "ui/compositor/layer.h"
#include "ui/gfx/image/image_skia.h"
typedef unsigned int SkColor;
namespace aura {
class Window;
}
namespace ash {
enum WallpaperLayout {
// Center the wallpaper on the desktop without scaling it. The wallpaper
// may be cropped.
WALLPAPER_LAYOUT_CENTER,
// Scale the wallpaper (while preserving its aspect ratio) to cover the
// desktop; the wallpaper may be cropped.
WALLPAPER_LAYOUT_CENTER_CROPPED,
// Scale the wallpaper (without preserving its aspect ratio) to match the
// desktop's size.
WALLPAPER_LAYOUT_STRETCH,
// Tile the wallpaper over the background without scaling it.
WALLPAPER_LAYOUT_TILE
};
const SkColor kLoginWallpaperColor = 0xFEFEFE;
class DesktopBackgroundControllerObserver;
class WallpaperResizer;
// Updates background layer if necessary.
class ASH_EXPORT DesktopBackgroundController
: public DisplayController::Observer,
public ShellObserver {
public:
class TestAPI;
enum BackgroundMode {
BACKGROUND_NONE,
BACKGROUND_IMAGE,
};
DesktopBackgroundController();
virtual ~DesktopBackgroundController();
BackgroundMode desktop_background_mode() const {
return desktop_background_mode_;
}
// Add/Remove observers.
void AddObserver(DesktopBackgroundControllerObserver* observer);
void RemoveObserver(DesktopBackgroundControllerObserver* observer);
// Provides current image on the background, or empty gfx::ImageSkia if there
// is no image, e.g. background is none.
gfx::ImageSkia GetWallpaper() const;
WallpaperLayout GetWallpaperLayout() const;
// Sets wallpaper. This is mostly called by WallpaperManager to set
// the default or user selected custom wallpaper.
// Returns true if new image was actually set. And false when duplicate set
// request detected.
bool SetWallpaperImage(const gfx::ImageSkia& image, WallpaperLayout layout);
// Creates an empty wallpaper. Some tests require a wallpaper widget is ready
// when running. However, the wallpaper widgets are now created
// asynchronously. If loading a real wallpaper, there are cases that these
// tests crash because the required widget is not ready. This function
// synchronously creates an empty widget for those tests to prevent
// crashes. An example test is SystemGestureEventFilterTest.ThreeFingerSwipe.
void CreateEmptyWallpaper();
// Move all desktop widgets to locked container.
// Returns true if the desktop moved.
bool MoveDesktopToLockedContainer();
// Move all desktop widgets to unlocked container.
// Returns true if the desktop moved.
bool MoveDesktopToUnlockedContainer();
// DisplayController::Observer:
virtual void OnDisplayConfigurationChanged() OVERRIDE;
// ShellObserver:
virtual void OnRootWindowAdded(aura::Window* root_window) OVERRIDE;
// Returns the maximum size of all displays combined in native
// resolutions. Note that this isn't the bounds of the display who
// has maximum resolutions. Instead, this returns the size of the
// maximum width of all displays, and the maximum height of all displays.
static gfx::Size GetMaxDisplaySizeInNative();
// Returns true if the specified wallpaper is already stored
// in |current_wallpaper_|.
// If |compare_layouts| is false, layout is ignored.
bool WallpaperIsAlreadyLoaded(const gfx::ImageSkia& image,
bool compare_layouts,
WallpaperLayout layout) const;
private:
friend class DesktopBackgroundControllerTest;
// friend class chromeos::WallpaperManagerBrowserTestDefaultWallpaper;
FRIEND_TEST_ALL_PREFIXES(DesktopBackgroundControllerTest, GetMaxDisplaySize);
// Creates view for all root windows, or notifies them to repaint if they
// already exist.
void SetDesktopBackgroundImageMode();
// Creates and adds component for current mode (either Widget or Layer) to
// |root_window|.
void InstallDesktopController(aura::Window* root_window);
// Creates and adds component for current mode (either Widget or Layer) to
// all root windows.
void InstallDesktopControllerForAllWindows();
// Moves all desktop components from one container to other across all root
// windows. Returns true if a desktop moved.
bool ReparentBackgroundWidgets(int src_container, int dst_container);
// Returns id for background container for unlocked and locked states.
int GetBackgroundContainerId(bool locked);
// Send notification that background animation finished.
void NotifyAnimationFinished();
// Reload the wallpaper.
void UpdateWallpaper();
void set_wallpaper_reload_delay_for_test(bool value) {
wallpaper_reload_delay_ = value;
}
// Can change at runtime.
bool locked_;
BackgroundMode desktop_background_mode_;
SkColor background_color_;
ObserverList<DesktopBackgroundControllerObserver> observers_;
// The current wallpaper.
scoped_ptr<WallpaperResizer> current_wallpaper_;
gfx::Size current_max_display_size_;
base::OneShotTimer<DesktopBackgroundController> timer_;
int wallpaper_reload_delay_;
DISALLOW_COPY_AND_ASSIGN(DesktopBackgroundController);
};
} // namespace ash
#endif // ASH_DESKTOP_BACKGROUND_DESKTOP_BACKGROUND_CONTROLLER_H_
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