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/*
* Copyright (C) 2013 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
* THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "PageThrottler.h"
#include "PageActivityAssertionToken.h"
namespace WebCore {
PageThrottler::PageThrottler(Page& page, ViewState::Flags viewState)
: m_page(page)
, m_viewState(viewState)
, m_weakPtrFactory(this)
, m_hysteresis(*this)
, m_activityCount(0)
{
updateUserActivity();
}
void PageThrottler::createUserActivity()
{
ASSERT(!m_activity);
m_activity = std::make_unique<UserActivity::Impl>("Page is active.");
updateUserActivity();
}
std::unique_ptr<PageActivityAssertionToken> PageThrottler::mediaActivityToken()
{
return std::make_unique<PageActivityAssertionToken>(*this);
}
std::unique_ptr<PageActivityAssertionToken> PageThrottler::pageLoadActivityToken()
{
return std::make_unique<PageActivityAssertionToken>(*this);
}
void PageThrottler::incrementActivityCount()
{
// If m_activityCount is nonzero, state must be Started; if m_activityCount is zero, state may be Waiting or Stopped.
ASSERT(!!m_activityCount == (m_hysteresis.state() == HysteresisState::Started));
if (!m_activityCount++)
m_hysteresis.start();
ASSERT(m_activityCount && m_hysteresis.state() == HysteresisState::Started);
}
void PageThrottler::decrementActivityCount()
{
ASSERT(m_activityCount && m_hysteresis.state() == HysteresisState::Started);
if (!--m_activityCount)
m_hysteresis.stop();
// If m_activityCount is nonzero, state must be Started; if m_activityCount is zero, state may be Waiting or Stopped.
ASSERT(!!m_activityCount == (m_hysteresis.state() == HysteresisState::Started));
}
void PageThrottler::updateUserActivity()
{
if (!m_activity)
return;
// Allow throttling if there is no page activity, and the page is visually idle.
if (m_hysteresis.state() == HysteresisState::Stopped && m_viewState & ViewState::IsVisuallyIdle)
m_activity->endActivity();
else
m_activity->beginActivity();
}
void PageThrottler::setViewState(ViewState::Flags viewState)
{
ViewState::Flags changed = m_viewState ^ viewState;
m_viewState = viewState;
if (changed & ViewState::IsVisuallyIdle)
updateUserActivity();
}
void PageThrottler::started()
{
updateUserActivity();
}
void PageThrottler::stopped()
{
updateUserActivity();
}
}
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