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// 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 "base/time.h"
#include "base/timer.h"
#include "chrome/browser/ui/panels/panel_mouse_watcher.h"
#include "ui/gfx/screen.h"
// A timer based implementation of PanelMouseWatcher. Currently used for Gtk
// and Mac panels implementations.
class PanelMouseWatcherTimer : public PanelMouseWatcher {
public:
PanelMouseWatcherTimer();
virtual ~PanelMouseWatcherTimer();
private:
virtual void Start() OVERRIDE;
virtual void Stop() OVERRIDE;
virtual bool IsActive() const OVERRIDE;
// Specifies the rate at which we want to sample the mouse position.
static const int kMousePollingIntervalMs = 250;
// Timer callback function.
void DoWork();
friend class base::RepeatingTimer<PanelMouseWatcherTimer>;
// Timer used to track mouse movements. Some OSes do 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<PanelMouseWatcherTimer> timer_;
DISALLOW_COPY_AND_ASSIGN(PanelMouseWatcherTimer);
};
// static
PanelMouseWatcher* PanelMouseWatcher::Create() {
return new PanelMouseWatcherTimer();
}
PanelMouseWatcherTimer::PanelMouseWatcherTimer() {
}
PanelMouseWatcherTimer::~PanelMouseWatcherTimer() {
DCHECK(!IsActive());
}
void PanelMouseWatcherTimer::Start() {
DCHECK(!IsActive());
timer_.Start(FROM_HERE,
base::TimeDelta::FromMilliseconds(kMousePollingIntervalMs),
this, &PanelMouseWatcherTimer::DoWork);
}
void PanelMouseWatcherTimer::Stop() {
DCHECK(IsActive());
timer_.Stop();
}
bool PanelMouseWatcherTimer::IsActive() const {
return timer_.IsRunning();
}
void PanelMouseWatcherTimer::DoWork() {
NotifyMouseMovement(gfx::Screen::GetCursorScreenPoint());
}
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