blob: b4b9ab1319a2387a20794c072e7a2efbafddfc61 [file] [log] [blame]
// 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.
#include <vector>
#include "ash/ash_export.h"
#include "base/macros.h"
#include "ui/aura/window_observer.h"
#include "ui/wm/public/activation_change_observer.h"
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 ::wm::ActivationChangeObserver,
public aura::WindowObserver {
using WindowList = std::vector<aura::Window*>;
~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;
// This does the same thing as |BuildMruWindowList()| but with some
// exclusions. This list is used for cycling through by the keyboard via
// alt-tab.
WindowList BuildWindowForCycleList() 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);
// Updates the mru_windows_ list to insert/move |active_window| at/to the
// front.
void SetActiveWindow(aura::Window* active_window);
// Overridden from wm::ActivationChangeObserver:
void OnWindowActivated(ActivationReason reason,
aura::Window* gained_active,
aura::Window* lost_active) override;
// Overridden from aura::WindowObserver:
void OnWindowDestroyed(aura::Window* window) override;
// List of windows that have been activated in containers that we cycle
// through, sorted such that the most recently used window comes last.
std::vector<aura::Window*> mru_windows_;
bool ignore_window_activations_ = false;
} // namespace ash