1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
// Copyright 2014 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 DeviceEventControllerBase_h
#define DeviceEventControllerBase_h
#include "core/page/PageLifecycleObserver.h"
#include "platform/Timer.h"
namespace WebCore {
// Base controller class for registering controllers with a dispatcher.
// It watches page visibility and calls stopUpdating when page is not visible.
// It provides a didUpdateData() callback method which is called when new data
// it available.
class DeviceEventControllerBase : public PageLifecycleObserver {
public:
void startUpdating();
void stopUpdating();
// This is called when new data becomes available.
virtual void didUpdateData() = 0;
protected:
explicit DeviceEventControllerBase(Page*);
virtual ~DeviceEventControllerBase();
virtual void registerWithDispatcher() = 0;
virtual void unregisterWithDispatcher() = 0;
// When true initiates a one-shot didUpdateData() when startUpdating() is called.
virtual bool hasLastData() = 0;
bool m_hasEventListener;
private:
// Inherited from PageLifecycleObserver.
virtual void pageVisibilityChanged() OVERRIDE FINAL;
void oneShotCallback(Timer<DeviceEventControllerBase>*);
bool m_isActive;
Timer<DeviceEventControllerBase> m_timer;
};
} // namespace WebCore
#endif // DeviceEventControllerBase_h
|
