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// Copyright (c) 2012 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_ACTIVATION_CONTROLLER_H_
#define ASH_WM_ACTIVATION_CONTROLLER_H_
#include "ash/ash_export.h"
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/observer_list.h"
#include "base/scoped_observer.h"
#include "ui/aura/client/activation_client.h"
#include "ui/aura/client/focus_change_observer.h"
#include "ui/aura/env_observer.h"
#include "ui/aura/window_observer.h"
#include "ui/base/events/event_handler.h"
namespace aura {
namespace client {
class ActivationChangeObserver;
class FocusClient;
}
}
namespace ash {
namespace internal {
class ActivationControllerDelegate;
// Exported for unit tests.
class ASH_EXPORT ActivationController
: public aura::client::ActivationClient,
public aura::WindowObserver,
public aura::EnvObserver,
public aura::client::FocusChangeObserver,
public ui::EventHandler {
public:
// The ActivationController takes ownership of |delegate|.
ActivationController(aura::client::FocusClient* focus_client,
ActivationControllerDelegate* delegate);
virtual ~ActivationController();
// Returns true if |window| exists within a container that supports
// activation. |event| is the event responsible for initiating the change, or
// NULL if there is no event.
static aura::Window* GetActivatableWindow(aura::Window* window,
const ui::Event* event);
// Overridden from aura::client::ActivationClient:
virtual void AddObserver(
aura::client::ActivationChangeObserver* observer) OVERRIDE;
virtual void RemoveObserver(
aura::client::ActivationChangeObserver* observer) OVERRIDE;
virtual void ActivateWindow(aura::Window* window) OVERRIDE;
virtual void DeactivateWindow(aura::Window* window) OVERRIDE;
virtual aura::Window* GetActiveWindow() OVERRIDE;
virtual aura::Window* GetActivatableWindow(aura::Window* window) OVERRIDE;
virtual aura::Window* GetToplevelWindow(aura::Window* window) OVERRIDE;
virtual bool OnWillFocusWindow(aura::Window* window,
const ui::Event* event) OVERRIDE;
virtual bool CanActivateWindow(aura::Window* window) const OVERRIDE;
// Overridden from aura::WindowObserver:
virtual void OnWindowVisibilityChanged(aura::Window* window,
bool visible) OVERRIDE;
virtual void OnWindowDestroying(aura::Window* window) OVERRIDE;
// Overridden from aura::EnvObserver:
virtual void OnWindowInitialized(aura::Window* window) OVERRIDE;
// Overridden from aura::client::FocusChangeObserver:
virtual void OnWindowFocused(aura::Window* gained_focus,
aura::Window* lost_focus) OVERRIDE;
private:
// Overridden from ui::EventHandler:
virtual void OnKeyEvent(ui::KeyEvent* event) OVERRIDE;
virtual void OnMouseEvent(ui::MouseEvent* event) OVERRIDE;
virtual void OnScrollEvent(ui::ScrollEvent* event) OVERRIDE;
virtual void OnTouchEvent(ui::TouchEvent* event) OVERRIDE;
virtual void OnGestureEvent(ui::GestureEvent* event) OVERRIDE;
// Implementation of ActivateWindow() with an Event.
void ActivateWindowWithEvent(aura::Window* window,
const ui::Event* event);
// Shifts activation to the next window, ignoring |window|. Returns the next
// window.
aura::Window* ActivateNextWindow(aura::Window* window);
// Returns the next window that should be activated, ignoring |ignore|.
aura::Window* GetTopmostWindowToActivate(aura::Window* ignore) const;
// Returns the next window that should be activated in |container| ignoring
// the window |ignore|.
aura::Window* GetTopmostWindowToActivateInContainer(
aura::Window* container,
aura::Window* ignore) const;
// Called from the ActivationController's event handler implementation to
// handle focus to the |event|'s target. Not all targets are focusable or
// result in focus changes.
void FocusWindowWithEvent(const ui::Event* event);
aura::client::FocusClient* focus_client_;
// True inside ActivateWindow(). Used to prevent recursion of focus
// change notifications causing activation.
bool updating_activation_;
aura::Window* active_window_;
ObserverList<aura::client::ActivationChangeObserver> observers_;
ScopedObserver<aura::Window, aura::WindowObserver> observer_manager_;
scoped_ptr<ActivationControllerDelegate> delegate_;
DISALLOW_COPY_AND_ASSIGN(ActivationController);
};
} // namespace internal
} // namespace ash
#endif // ASH_WM_ACTIVATION_CONTROLLER_H_
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