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// 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/macros.h"
#include "base/memory/scoped_ptr.h"
#include "ui/aura/window_observer.h"
#include "ui/wm/public/activation_change_observer.h"
namespace aura {
class RootWindow;
class Window;
namespace client {
class ActivationClient;
}
}
namespace ash {
namespace wm {
class AshFocusRules;
} // namespace wm
// 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;
MruWindowTracker(
aura::client::ActivationClient* activation_client,
ash::wm::AshFocusRules* focus_rules);
~MruWindowTracker() override;
// Returns the set of windows which can be cycled through using the tracked
// list of most recently used windows.
WindowList BuildMruWindowList() const;
// This does the same thing as the above, but ignores the system modal dialog
// state and hence the returned list could contain more windows if a system
// modal dialog window is present.
WindowList BuildWindowListIgnoreModal() const;
// 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:
// Updates the mru_windows_ list to insert/move |active_window| at/to the
// front.
void SetActiveWindow(aura::Window* active_window);
// Overridden from aura::client::ActivationChangeObserver:
void OnWindowActivated(
aura::client::ActivationChangeObserver::ActivationReason reason,
aura::Window* gained_active,
aura::Window* lost_active) override;
// Overridden from WindowObserver:
void OnWindowDestroyed(aura::Window* window) override;
// Uses the focus rules to check whether the window can be activateable,
// regardless of the state of the System modal dialog.
bool IsWindowConsideredActivateable(aura::Window* window) const;
// 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_; // Not owned.
wm::AshFocusRules* focus_rules_; // Not owned.
bool ignore_window_activations_;
DISALLOW_COPY_AND_ASSIGN(MruWindowTracker);
};
} // namespace ash
#endif // ASH_WM_MRU_WINDOW_TRACKER_H_
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