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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 CHROME_BROWSER_UI_PANELS_PANEL_MOUSE_WATCHER_H_
#define CHROME_BROWSER_UI_PANELS_PANEL_MOUSE_WATCHER_H_
#include "base/gtest_prod_util.h"
#include "base/observer_list.h"
namespace gfx {
class Point;
}
class PanelMouseWatcherObserver;
// This is the base class for functionality to watch for mouse movements.
// The specific implementation of this abstract class differ in how they
// track mouse movements.
class PanelMouseWatcher {
public:
// Returns an instance of the platform specific implementation.
static PanelMouseWatcher* Create();
// clang gives an error asking for an out of line destructor.
virtual ~PanelMouseWatcher();
void AddObserver(PanelMouseWatcherObserver* observer);
void RemoveObserver(PanelMouseWatcherObserver* observer);
// Returns current mouse position. This may be different from the
// mouse position in NotifyMouseMovement.
virtual gfx::Point GetMousePosition() const = 0;
protected:
PanelMouseWatcher();
// |mouse_position| is in screen coordinates.
virtual void NotifyMouseMovement(const gfx::Point& mouse_position);
// Returns true if watching mouse movements.
virtual bool IsActive() const = 0;
private:
friend class PanelMouseWatcherTest;
FRIEND_TEST_ALL_PREFIXES(PanelMouseWatcherTest, StartStopWatching);
friend class BasePanelBrowserTest;
// Start/stop tracking mouse movements.
virtual void Start() = 0;
virtual void Stop() = 0;
ObserverList<PanelMouseWatcherObserver> observers_;
};
#endif // CHROME_BROWSER_UI_PANELS_PANEL_MOUSE_WATCHER_H_
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