| // Copyright 2013 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_MRU_WINDOW_TRACKER_H_ |
| #define ASH_WM_MRU_WINDOW_TRACKER_H_ |
| |
| #include <list> |
| #include <vector> |
| |
| #include "ash/ash_export.h" |
| #include "base/basictypes.h" |
| #include "base/memory/scoped_ptr.h" |
| #include "ui/aura/client/activation_change_observer.h" |
| #include "ui/aura/window_observer.h" |
| |
| namespace aura { |
| class RootWindow; |
| class Window; |
| namespace client { |
| class ActivationClient; |
| } |
| } |
| |
| namespace ash { |
| |
| // Maintains a most recently used list of windows. This is used for window |
| // cycling using Alt+Tab and overview mode. |
| class ASH_EXPORT MruWindowTracker |
| : public aura::client::ActivationChangeObserver, |
| public aura::WindowObserver { |
| public: |
| typedef std::vector<aura::Window*> WindowList; |
| |
| explicit MruWindowTracker( |
| aura::client::ActivationClient* activation_client); |
| virtual ~MruWindowTracker(); |
| |
| // Set up the observers to handle window changes for the containers we care |
| // about. Called when a new root window is added. |
| void OnRootWindowAdded(aura::RootWindow* root_window); |
| |
| // Returns the set of windows which can be cycled through. This method creates |
| // the vector based on the current set of windows across all valid root |
| // windows. As a result it is not necessarily the same as the set of |
| // windows being iterated over. |
| // If |top_most_at_end| the window list will return in ascending (lowest |
| // window in stacking order first) order instead of the default descending |
| // (top most window first) order. |
| static WindowList BuildWindowList(bool top_most_at_end); |
| |
| // Returns the set of windows which can be cycled through using the tracked |
| // list of most recently used windows. |
| WindowList BuildMruWindowList(); |
| |
| // Starts or stops ignoring window activations. If no longer ignoring |
| // activations the currently active window is moved to the front of the |
| // MRU window list. Used by WindowCycleList to avoid adding all cycled |
| // windows to the front of the MRU window list. |
| void SetIgnoreActivations(bool ignore); |
| |
| private: |
| // Checks if the window represents a container whose children we track. |
| static bool IsTrackedContainer(aura::Window* window); |
| |
| // Overridden from aura::client::ActivationChangeObserver: |
| virtual void OnWindowActivated(aura::Window* gained_active, |
| aura::Window* lost_active) OVERRIDE; |
| |
| // Overridden from WindowObserver: |
| virtual void OnWillRemoveWindow(aura::Window* window) OVERRIDE; |
| virtual void OnWindowDestroying(aura::Window* window) OVERRIDE; |
| |
| // List of windows that have been activated in containers that we cycle |
| // through, sorted by most recently used. |
| std::list<aura::Window*> mru_windows_; |
| |
| aura::client::ActivationClient* activation_client_; |
| |
| bool ignore_window_activations_; |
| |
| DISALLOW_COPY_AND_ASSIGN(MruWindowTracker); |
| }; |
| |
| } // namespace ash |
| |
| #endif // ASH_WM_MRU_WINDOW_TRACKER_H_ |