1/*
2 * Copyright (C) 2013 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 *    notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 *    notice, this list of conditions and the following disclaimer in the
11 *    documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23 * THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "PageThrottler.h"
28
29#include "Chrome.h"
30#include "ChromeClient.h"
31#include "MainFrame.h"
32#include "Page.h"
33#include "PageActivityAssertionToken.h"
34#include <wtf/StdLibExtras.h>
35
36namespace WebCore {
37
38PageThrottler::PageThrottler(Page& page, ViewState::Flags viewState)
39    : m_page(page)
40    , m_viewState(viewState)
41    , m_weakPtrFactory(this)
42    , m_hysteresis(*this)
43    , m_activity("Page is active.")
44    , m_activityCount(0)
45{
46    if (!(m_viewState & ViewState::IsVisuallyIdle))
47        m_hysteresis.start();
48}
49
50std::unique_ptr<PageActivityAssertionToken> PageThrottler::mediaActivityToken()
51{
52    return std::make_unique<PageActivityAssertionToken>(*this);
53}
54
55std::unique_ptr<PageActivityAssertionToken> PageThrottler::pageLoadActivityToken()
56{
57    return std::make_unique<PageActivityAssertionToken>(*this);
58}
59
60void PageThrottler::incrementActivityCount()
61{
62    ++m_activityCount;
63    updateHysteresis();
64}
65
66void PageThrottler::decrementActivityCount()
67{
68    --m_activityCount;
69    updateHysteresis();
70}
71
72void PageThrottler::updateHysteresis()
73{
74    if (m_activityCount || !(m_viewState & ViewState::IsVisuallyIdle))
75        m_hysteresis.start();
76    else
77        m_hysteresis.stop();
78}
79
80void PageThrottler::setViewState(ViewState::Flags viewState)
81{
82    ViewState::Flags changed = m_viewState ^ viewState;
83    m_viewState = viewState;
84
85    if (changed & ViewState::IsVisuallyIdle)
86        updateHysteresis();
87}
88
89void PageThrottler::started()
90{
91    m_activity.beginActivity();
92}
93
94void PageThrottler::stopped()
95{
96    m_activity.endActivity();
97}
98
99}
100