#ifndef PageThrottler_h
#define PageThrottler_h
#include "Timer.h"
#include "UserActivity.h"
#include "ViewState.h"
#include <wtf/RefCounter.h>
namespace WebCore {
class Page;
enum PageActivityCounterType { };
typedef RefCounter<PageActivityCounterType> PageActivityCounter;
typedef PageActivityCounter::Token PageActivityAssertionToken;
struct PageActivityState {
enum {
UserInputActivity = 1 << 0,
MediaActivity = 1 << 1,
PageLoadActivity = 1 << 2,
};
typedef unsigned Flags;
static const Flags NoFlags = 0;
static const Flags AllFlags = UserInputActivity | MediaActivity | PageLoadActivity;
};
class PageThrottler {
WTF_MAKE_FAST_ALLOCATED;
public:
PageThrottler(Page&);
void didReceiveUserInput() { m_userInputHysteresis.impulse(); }
PageActivityState::Flags activityState() { return m_activityState; }
void pluginDidEvaluateWhileAudioIsPlaying() { m_mediaActivityHysteresis.impulse(); }
PageActivityAssertionToken mediaActivityToken();
PageActivityAssertionToken pageLoadActivityToken();
private:
void mediaActivityCounterChanged();
void pageLoadActivityCounterChanged();
void setActivityFlag(PageActivityState::Flags, bool);
Page& m_page;
PageActivityState::Flags m_activityState { PageActivityState::NoFlags };
HysteresisActivity m_userInputHysteresis;
HysteresisActivity m_mediaActivityHysteresis;
HysteresisActivity m_pageLoadActivityHysteresis;
PageActivityCounter m_mediaActivityCounter;
PageActivityCounter m_pageLoadActivityCounter;
};
}
#endif