1// Copyright (c) 2012 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#include "base/time/time.h"
6#include "base/timer/timer.h"
7#include "chrome/browser/ui/panels/panel_mouse_watcher.h"
8#include "ui/gfx/screen.h"
9
10// A timer based implementation of PanelMouseWatcher.  Currently used for Gtk
11// and Mac panels implementations.
12class PanelMouseWatcherTimer : public PanelMouseWatcher {
13 public:
14  PanelMouseWatcherTimer();
15  virtual ~PanelMouseWatcherTimer();
16
17 private:
18  virtual void Start() OVERRIDE;
19  virtual void Stop() OVERRIDE;
20  virtual bool IsActive() const OVERRIDE;
21  virtual gfx::Point GetMousePosition() const OVERRIDE;
22
23  // Specifies the rate at which we want to sample the mouse position.
24  static const int kMousePollingIntervalMs = 250;
25
26  // Timer callback function.
27  void DoWork();
28  friend class base::RepeatingTimer<PanelMouseWatcherTimer>;
29
30  // Timer used to track mouse movements. Some OSes do not provide an easy way
31  // of tracking mouse movements across applications.  So we use a timer to
32  // accomplish the same.  This could also be more efficient as you end up
33  // getting a lot of notifications when tracking mouse movements.
34  base::RepeatingTimer<PanelMouseWatcherTimer> timer_;
35
36  DISALLOW_COPY_AND_ASSIGN(PanelMouseWatcherTimer);
37};
38
39// static
40PanelMouseWatcher* PanelMouseWatcher::Create() {
41  return new PanelMouseWatcherTimer();
42}
43
44PanelMouseWatcherTimer::PanelMouseWatcherTimer() {
45}
46
47PanelMouseWatcherTimer::~PanelMouseWatcherTimer() {
48  DCHECK(!IsActive());
49}
50
51void PanelMouseWatcherTimer::Start() {
52  DCHECK(!IsActive());
53  timer_.Start(FROM_HERE,
54               base::TimeDelta::FromMilliseconds(kMousePollingIntervalMs),
55               this, &PanelMouseWatcherTimer::DoWork);
56}
57
58void PanelMouseWatcherTimer::Stop() {
59  DCHECK(IsActive());
60  timer_.Stop();
61}
62
63bool PanelMouseWatcherTimer::IsActive() const {
64  return timer_.IsRunning();
65}
66
67gfx::Point PanelMouseWatcherTimer::GetMousePosition() const {
68  // TODO(scottmg): NativeScreen is wrong. http://crbug.com/133312
69  return gfx::Screen::GetNativeScreen()->GetCursorScreenPoint();
70}
71
72void PanelMouseWatcherTimer::DoWork() {
73  NotifyMouseMovement(GetMousePosition());
74}
75