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// Copyright 2015 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 COMPONENTS_VIEW_MANAGER_FOCUS_CONTROLLER_H_
#define COMPONENTS_VIEW_MANAGER_FOCUS_CONTROLLER_H_
#include "base/memory/scoped_ptr.h"
#include "components/view_manager/server_view_drawn_tracker_observer.h"
namespace view_manager {
class FocusControllerDelegate;
class ServerView;
class ServerViewDrawnTracker;
// Tracks a focused view. Focus is moved to another view when the drawn state
// of the focused view changes and the delegate is notified.
class FocusController : public ServerViewDrawnTrackerObserver {
public:
explicit FocusController(FocusControllerDelegate* delegate);
~FocusController() override;
// Sets the focused view. Does nothing if |view| is currently focused. This
// does not notify the delegate.
void SetFocusedView(ServerView* view);
ServerView* GetFocusedView();
private:
// Describes the source of the change.
enum ChangeSource {
CHANGE_SOURCE_EXPLICIT,
CHANGE_SOURCE_DRAWN_STATE_CHANGED,
};
// Implementation of SetFocusedView().
void SetFocusedViewImpl(ServerView* view, ChangeSource change_source);
// ServerViewDrawnTrackerObserver:
void OnDrawnStateChanged(ServerView* ancestor,
ServerView* view,
bool is_drawn) override;
FocusControllerDelegate* delegate_;
scoped_ptr<ServerViewDrawnTracker> drawn_tracker_;
DISALLOW_COPY_AND_ASSIGN(FocusController);
};
} // namespace view_manager
#endif // COMPONENTS_VIEW_MANAGER_FOCUS_CONTROLLER_H_
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