Add Mouse hover behavior to Mac Panels when minimized

chrome/browser/ui/panels/panel_mouse_watcher_gtk.cc

-// Copyright (c) 2011 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.
-
-// #include "chrome/browser/ui/panels/panel_mouse_watcher_gtk.h"
-
-#include "base/memory/singleton.h"
-#include "base/time.h"
-#include "base/timer.h"
-#include "chrome/browser/ui/panels/panel_manager.h"
-#include "chrome/browser/ui/panels/panel_mouse_watcher.h"
-#include "ui/gfx/screen.h"
-
-// A timer based implementation of PanelMouseWatcher.  Currently used on Gtk
-// but could be used on any platform.
-class PanelMouseWatcherGtk : public PanelMouseWatcher {
- public:
-  // Returns the singleton instance.
-  static PanelMouseWatcherGtk* GetInstance();
-
-  virtual ~PanelMouseWatcherGtk();
-
- protected:
-  virtual void Start();
-  virtual void Stop();
-
- private:
-  // Specifies the rate at which we want to sample the mouse position.
-  static const int kMousePollingIntervalMs = 250;
-
-  PanelMouseWatcherGtk();
-  friend struct DefaultSingletonTraits<PanelMouseWatcherGtk>;
-
-  // Timer callback function.
-  void DoWork();
-  friend class base::RepeatingTimer<PanelMouseWatcherGtk>;
-
-  // Timer used to track mouse movements.  Gtk does not provide an easy way of
-  // tracking mouse movements across applications.  So we use a timer to
-  // accomplish the same.  This could also be more efficient as you end up
-  // getting a lot of notifications when tracking mouse movements.
-  base::RepeatingTimer<PanelMouseWatcherGtk> timer_;
-
-  DISALLOW_COPY_AND_ASSIGN(PanelMouseWatcherGtk);
-};
-
-// static
-PanelMouseWatcher* PanelMouseWatcher::GetInstance() {
-  return PanelMouseWatcherGtk::GetInstance();
-}
-
-// static
-PanelMouseWatcherGtk* PanelMouseWatcherGtk::GetInstance() {
-  return Singleton<PanelMouseWatcherGtk>::get();
-}
-
-PanelMouseWatcherGtk::PanelMouseWatcherGtk() : PanelMouseWatcher() {
-}
-
-PanelMouseWatcherGtk::~PanelMouseWatcherGtk() {
-}
-
-void PanelMouseWatcherGtk::Start() {
-  DCHECK(!timer_.IsRunning());
-  timer_.Start(FROM_HERE,
-               base::TimeDelta::FromMilliseconds(kMousePollingIntervalMs),
-               this, &PanelMouseWatcherGtk::DoWork);
-}
-
-void PanelMouseWatcherGtk::Stop() {
-  DCHECK(timer_.IsRunning());
-  timer_.Stop();
-}
-
-void PanelMouseWatcherGtk::DoWork() {
-  HandleMouseMovement(gfx::Screen::GetCursorScreenPoint());
-}