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// Copyright 2016 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.
#include <memory>
#include "ash/ash_export.h"
#include "ash/public/cpp/shelf_types.h"
#include "ash/shelf/shelf_layout_manager_observer.h"
#include "ash/shelf/shelf_locking_manager.h"
#include "base/observer_list.h"
namespace aura {
class Window;
namespace gfx {
class Rect;
namespace ui {
class GestureEvent;
class MouseWheelEvent;
namespace ash {
enum class AnimationChangeType;
class LoginShelfView;
class ShelfBezelEventHandler;
class ShelfLayoutManager;
class ShelfLayoutManagerTest;
class ShelfLockingManager;
class ShelfView;
class ShelfWidget;
class StatusAreaWidget;
class ShelfObserver;
// Controller for the shelf state. One per display, because each display might
// have different shelf alignment, autohide, etc. Exists for the lifetime of the
// root window controller.
class ASH_EXPORT Shelf : public ShelfLayoutManagerObserver {
~Shelf() override;
// Returns the shelf for the display that |window| is on. Note that the shelf
// widget may not exist, or the shelf may not be visible.
static Shelf* ForWindow(aura::Window* window);
void CreateShelfWidget(aura::Window* root);
void ShutdownShelfWidget();
void DestroyShelfWidget();
ShelfLayoutManager* shelf_layout_manager() const {
return shelf_layout_manager_;
ShelfWidget* shelf_widget() { return shelf_widget_.get(); }
// Returns the window showing the shelf.
aura::Window* GetWindow();
ShelfAlignment alignment() const { return alignment_; }
void SetAlignment(ShelfAlignment alignment);
// Returns true if the shelf alignment is horizontal (i.e. at the bottom).
bool IsHorizontalAlignment() const;
// Returns a value based on shelf alignment.
int SelectValueForShelfAlignment(int bottom, int left, int right) const;
// Returns |horizontal| is shelf is horizontal, otherwise |vertical|.
int PrimaryAxisValue(int horizontal, int vertical) const;
ShelfAutoHideBehavior auto_hide_behavior() const {
return auto_hide_behavior_;
void SetAutoHideBehavior(ShelfAutoHideBehavior behavior);
ShelfAutoHideState GetAutoHideState() const;
// Invoke when the auto-hide state may have changed (for example, when the
// system tray bubble opens it should force the shelf to be visible).
void UpdateAutoHideState();
ShelfBackgroundType GetBackgroundType() const;
void UpdateVisibilityState();
ShelfVisibilityState GetVisibilityState() const;
int GetAccessibilityPanelHeight() const;
// Returns the ideal bounds of the shelf assuming it is visible.
gfx::Rect GetIdealBounds();
gfx::Rect GetUserWorkAreaBounds() const;
// Updates the icon position given the current window bounds. This is used
// when dragging panels to reposition them with respect to the other panels.
void UpdateIconPositionForPanel(aura::Window* window);
// Returns the screen bounds of the item for the specified window. If there is
// no item for the specified window an empty rect is returned.
gfx::Rect GetScreenBoundsOfItemIconForWindow(aura::Window* window);
// Launch a 0-indexed shelf item in the shelf. A negative index launches the
// last shelf item in the shelf.
static void LaunchShelfItem(int item_index);
// Activates the shelf item specified by the index in the list of shelf items.
static void ActivateShelfItem(int item_index);
// Activates the shelf item specified by the index in the list of shelf items
// on the display identified by |display_id|.
static void ActivateShelfItemOnDisplay(int item_index, int64_t display_id);
// Handles a gesture |event| coming from a source outside the shelf widget
// (e.g. the status area widget). Allows support for behaviors like toggling
// auto-hide with a swipe, even if that gesture event hits another window.
// Returns true if the event was handled.
bool ProcessGestureEvent(const ui::GestureEvent& event);
// Handles a mousewheel scroll event coming from the shelf.
void ProcessMouseWheelEvent(const ui::MouseWheelEvent& event);
void AddObserver(ShelfObserver* observer);
void RemoveObserver(ShelfObserver* observer);
void NotifyShelfIconPositionsChanged();
StatusAreaWidget* GetStatusAreaWidget() const;
void set_is_tablet_mode_animation_running(bool value) {
is_tablet_mode_animation_running_ = value;
bool is_tablet_mode_animation_running() const {
return is_tablet_mode_animation_running_;
void SetVirtualKeyboardBoundsForTesting(const gfx::Rect& bounds);
ShelfLockingManager* GetShelfLockingManagerForTesting();
ShelfView* GetShelfViewForTesting();
LoginShelfView* GetLoginShelfViewForTesting();
// ShelfLayoutManagerObserver:
void WillDeleteShelfLayoutManager() override;
void WillChangeVisibilityState(ShelfVisibilityState new_state) override;
void OnAutoHideStateChanged(ShelfAutoHideState new_state) override;
void OnBackgroundUpdated(ShelfBackgroundType background_type,
AnimationChangeType change_type) override;
class AutoHideEventHandler;
friend class ShelfLayoutManagerTest;
// Layout manager for the shelf container window. Instances are constructed by
// ShelfWidget and lifetimes are managed by the container windows themselves.
ShelfLayoutManager* shelf_layout_manager_ = nullptr;
std::unique_ptr<ShelfWidget> shelf_widget_;
// These initial values hide the shelf until user preferences are available.
ShelfAlignment alignment_ = SHELF_ALIGNMENT_BOTTOM_LOCKED;
ShelfAutoHideBehavior auto_hide_behavior_ = SHELF_AUTO_HIDE_ALWAYS_HIDDEN;
// Sets shelf alignment to bottom during login and screen lock.
ShelfLockingManager shelf_locking_manager_;
base::ObserverList<ShelfObserver> observers_;
// Forwards mouse and gesture events to ShelfLayoutManager for auto-hide.
// TODO(mash): Facilitate simliar functionality in mash:
std::unique_ptr<AutoHideEventHandler> auto_hide_event_handler_;
// Forwards touch gestures on a bezel sensor to the shelf.
// TODO(mash): Facilitate simliar functionality in mash:
std::unique_ptr<ShelfBezelEventHandler> bezel_event_handler_;
// True while the animation to enter or exit tablet mode is running. Sometimes
// this value is true when the shelf movements are not actually animating
// (animation value = 0.0). This is because this is set to true when we
// enter/exit tablet mode but the animation is not started until a shelf
// OnBoundsChanged is called because of tablet mode. Use this value to sync
// the animation for AppListButton.
bool is_tablet_mode_animation_running_ = false;
} // namespace ash
#endif // ASH_SHELF_SHELF_H_