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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 UI_VIEWS_MOUSE_WATCHER_H_
#define UI_VIEWS_MOUSE_WATCHER_H_
#include "base/basictypes.h"
#include "base/memory/scoped_ptr.h"
#include "base/time/time.h"
#include "ui/gfx/insets.h"
#include "ui/views/views_export.h"
namespace gfx {
class Point;
}
namespace views {
// MouseWatcherListener is notified when the mouse moves outside the host.
class VIEWS_EXPORT MouseWatcherListener {
public:
virtual void MouseMovedOutOfHost() = 0;
protected:
virtual ~MouseWatcherListener();
};
// The MouseWatcherHost determines what region is to be monitored.
class VIEWS_EXPORT MouseWatcherHost {
public:
// The MouseEventType can be used as a hint.
enum MouseEventType {
// The mouse moved within the window which was current when the MouseWatcher
// was created.
MOUSE_MOVE,
// The mouse moved exited the window which was current when the MouseWatcher
// was created.
MOUSE_EXIT
};
virtual ~MouseWatcherHost();
// Return false when the mouse has moved outside the monitored region.
virtual bool Contains(const gfx::Point& screen_point,
MouseEventType type) = 0;
};
// MouseWatcher is used to watch mouse movement and notify its listener when the
// mouse moves outside the bounds of a MouseWatcherHost.
class VIEWS_EXPORT MouseWatcher {
public:
// Creates a new MouseWatcher. The |listener| will be notified when the |host|
// determines that the mouse has moved outside its monitored region.
// |host| will be owned by the watcher and deleted upon completion.
MouseWatcher(MouseWatcherHost* host, MouseWatcherListener* listener);
~MouseWatcher();
// Sets the amount to delay before notifying the listener when the mouse exits
// the host by way of going to another window.
void set_notify_on_exit_time(base::TimeDelta time) {
notify_on_exit_time_ = time;
}
// Starts watching mouse movements. When the mouse moves outside the bounds of
// the host the listener is notified. |Start| may be invoked any number of
// times. If the mouse moves outside the bounds of the host the listener is
// notified and watcher stops watching events.
void Start();
// Stops watching mouse events.
void Stop();
private:
class Observer;
// Are we currently observing events?
bool is_observing() const { return observer_.get() != NULL; }
// Notifies the listener and stops watching events.
void NotifyListener();
// Host we're listening for events over.
scoped_ptr<MouseWatcherHost> host_;
// Our listener.
MouseWatcherListener* listener_;
// Does the actual work of listening for mouse events.
scoped_ptr<Observer> observer_;
// See description above setter.
base::TimeDelta notify_on_exit_time_;
DISALLOW_COPY_AND_ASSIGN(MouseWatcher);
};
} // namespace views
#endif // UI_VIEWS_MOUSE_WATCHER_H_
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