| // Copyright 2014 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_WM_WINDOW_CYCLE_LIST_H_ |
| #define ASH_WM_WINDOW_CYCLE_LIST_H_ |
| |
| #include <memory> |
| #include <vector> |
| |
| #include "ash/ash_export.h" |
| #include "ash/wm/window_cycle_controller.h" |
| #include "base/scoped_observer.h" |
| #include "base/timer/timer.h" |
| #include "ui/aura/window_observer.h" |
| #include "ui/display/display_observer.h" |
| #include "ui/display/screen.h" |
| #include "ui/views/view.h" |
| |
| namespace aura { |
| class ScopedWindowTargeter; |
| class Window; |
| } |
| |
| namespace views { |
| class Widget; |
| } |
| |
| namespace ash { |
| |
| class WindowCycleView; |
| |
| // Tracks a set of Windows that can be stepped through. This class is used by |
| // the WindowCycleController. |
| class ASH_EXPORT WindowCycleList : public aura::WindowObserver, |
| public display::DisplayObserver { |
| public: |
| using WindowList = std::vector<aura::Window*>; |
| |
| explicit WindowCycleList(const WindowList& windows); |
| WindowCycleList(const WindowCycleList&) = delete; |
| WindowCycleList& operator=(const WindowCycleList&) = delete; |
| ~WindowCycleList() override; |
| |
| // Removes the existing windows and replaces them with |windows|. If |
| // |windows| is empty, cancels cycling. |
| void ReplaceWindows(const WindowList& windows); |
| |
| // Cycles to the next or previous window based on |direction|. This moves the |
| // focus ring to the next/previous window and also scrolls the list. |
| void Step(WindowCycleController::Direction direction); |
| |
| // Scrolls windows in given |direction|. Does not move the focus ring. |
| void ScrollInDirection(WindowCycleController::Direction direction); |
| |
| // Moves the focus ring to the respective preview for |window|. Does not |
| // scroll the window cycle list. |
| void SetFocusedWindow(aura::Window* window); |
| |
| // Checks whether |event| occurs within the cycle view. Returns false if |
| // |cycle_view_| does not exist. |
| bool IsEventInCycleView(ui::LocatedEvent* event); |
| |
| // Returns true if the window list overlay should be shown. |
| bool ShouldShowUi(); |
| |
| void set_user_did_accept(bool user_did_accept) { |
| user_did_accept_ = user_did_accept; |
| } |
| |
| private: |
| friend class WindowCycleControllerTest; |
| friend class InteractiveWindowCycleListGestureHandlerTest; |
| |
| static void DisableInitialDelayForTesting(); |
| |
| const WindowList& windows() const { return windows_; } |
| const views::Widget* widget() const { return cycle_ui_widget_; } |
| |
| // aura::WindowObserver overrides: |
| // There is a chance a window is destroyed, for example by JS code. We need to |
| // take care of that even if it is not intended for the user to close a window |
| // while window cycling. |
| void OnWindowDestroying(aura::Window* window) override; |
| |
| // display::DisplayObserver: |
| void OnDisplayMetricsChanged(const display::Display& display, |
| uint32_t changed_metrics) override; |
| |
| // Removes all windows from the window list. Also removes the windows from |
| // |cycle_view_| if |cycle_view_| exists. |
| void RemoveAllWindows(); |
| |
| // Initializes and shows |cycle_view_|. |
| void InitWindowCycleView(); |
| |
| // Selects a window, which either activates it or expands it in the case of |
| // PIP. |
| void SelectWindow(aura::Window* window); |
| |
| // Scrolls windows by |offset|. Does not move the focus ring. If you want to |
| // scroll the list and move the focus ring in one animation, call |
| // SetFocusedWindow() before this. |
| void Scroll(int offset); |
| |
| // Returns the index for the window |offset| away from |current_index_|. Can |
| // only be called if |windows_| is not empty. Also checks that the window for |
| // the returned index exists. |
| int GetOffsettedWindowIndex(int offset) const; |
| |
| // Returns the index for |window| in |windows_|. |window| must be in |
| // |windows_|. |
| int GetIndexOfWindow(aura::Window* window) const; |
| |
| // Returns the views for the window cycle list. |
| const views::View::Views& GetWindowCycleItemViewsForTesting() const; |
| |
| // Returns the window cycle list's target window. |
| const aura::Window* GetTargetWindowForTesting() const; |
| |
| WindowCycleView* cycle_view_for_testing() const { return cycle_view_; } |
| |
| int current_index_for_testing() const { return current_index_; } |
| |
| // List of weak pointers to windows to use while cycling with the keyboard. |
| // List is built when the user initiates the gesture (i.e. hits alt-tab the |
| // first time) and is emptied when the gesture is complete (i.e. releases the |
| // alt key). |
| WindowList windows_; |
| |
| // Current position in the |windows_|. Can be used to query selection depth, |
| // i.e., the position of an active window in a global MRU ordering. |
| int current_index_ = 0; |
| |
| // True if the user accepted the window switch (as opposed to cancelling or |
| // interrupting the interaction). |
| bool user_did_accept_ = false; |
| |
| // True if one of the windows in the list has already been selected. |
| bool window_selected_ = false; |
| |
| // The top level View for the window cycle UI. May be null if the UI is not |
| // showing. |
| WindowCycleView* cycle_view_ = nullptr; |
| |
| // The widget that hosts the window cycle UI. |
| views::Widget* cycle_ui_widget_ = nullptr; |
| |
| // The window list will dismiss if the display metrics change. |
| ScopedObserver<display::Screen, display::DisplayObserver> screen_observer_{ |
| this}; |
| |
| // A timer to delay showing the UI. Quick Alt+Tab should not flash a UI. |
| base::OneShotTimer show_ui_timer_; |
| |
| // This is needed so that it won't leak keyboard events even if the widget is |
| // not activatable. |
| std::unique_ptr<aura::ScopedWindowTargeter> window_targeter_; |
| }; |
| |
| } // namespace ash |
| |
| #endif // ASH_WM_WINDOW_CYCLE_LIST_H_ |