ash/wm/mru_window_tracker.h

   1 // Copyright 2013 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_WM_MRU_WINDOW_TRACKER_H_
   6 #define ASH_WM_MRU_WINDOW_TRACKER_H_
   7
   8 #include <list>
   9 #include <vector>
  10
  11 #include "ash/ash_export.h"
  12 #include "base/basictypes.h"
  13 #include "base/memory/scoped_ptr.h"
  14 #include "ui/aura/window_observer.h"
  15 #include "ui/wm/public/activation_change_observer.h"
  16
  17 namespace aura {
  18 class RootWindow;
  19 class Window;
  20 namespace client {
  21 class ActivationClient;
  22 }
  23 }
  24
  25 namespace ash {
  26
  27 namespace wm {
  28
  29 class AshFocusRules;
  30
  31 }  // namespace wm
  32
  33
  34 // Maintains a most recently used list of windows. This is used for window
  35 // cycling using Alt+Tab and overview mode.
  36 class ASH_EXPORT MruWindowTracker
  37     : public aura::client::ActivationChangeObserver,
  38       public aura::WindowObserver {
  39  public:
  40   typedef std::vector<aura::Window*> WindowList;
  41
  42   MruWindowTracker(
  43       aura::client::ActivationClient* activation_client,
  44       ash::wm::AshFocusRules* focus_rules);
  45   ~MruWindowTracker() override;
  46
  47   // Returns the set of windows which can be cycled through using the tracked
  48   // list of most recently used windows.
  49   WindowList BuildMruWindowList() const;
  50
  51   // This does the same thing as the above, but ignores the system modal dialog
  52   // state and hence the returned list could contain more windows if a system
  53   // modal dialog window is present.
  54   WindowList BuildWindowListIgnoreModal() const;
  55
  56   // Starts or stops ignoring window activations. If no longer ignoring
  57   // activations the currently active window is moved to the front of the
  58   // MRU window list. Used by WindowCycleList to avoid adding all cycled
  59   // windows to the front of the MRU window list.
  60   void SetIgnoreActivations(bool ignore);
  61
  62  private:
  63   // Updates the mru_windows_ list to insert/move |active_window| at/to the
  64   // front.
  65   void SetActiveWindow(aura::Window* active_window);
  66
  67   // Overridden from aura::client::ActivationChangeObserver:
  68   void OnWindowActivated(
  69       aura::client::ActivationChangeObserver::ActivationReason reason,
  70       aura::Window* gained_active,
  71       aura::Window* lost_active) override;
  72
  73   // Overridden from WindowObserver:
  74   void OnWindowDestroyed(aura::Window* window) override;
  75
  76   // Uses the focus rules to check whether the window can be activateable,
  77   // regardless of the state of the System modal dialog.
  78   bool IsWindowConsideredActivateable(aura::Window* window) const;
  79
  80   // List of windows that have been activated in containers that we cycle
  81   // through, sorted by most recently used.
  82   std::list<aura::Window*> mru_windows_;
  83
  84   aura::client::ActivationClient* activation_client_;  // Not owned.
  85
  86   wm::AshFocusRules* focus_rules_;  // Not owned.
  87
  88   bool ignore_window_activations_;
  89
  90   DISALLOW_COPY_AND_ASSIGN(MruWindowTracker);
  91 };
  92
  93 }  // namespace ash
  94
  95 #endif  // ASH_WM_MRU_WINDOW_TRACKER_H_