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/*
* Copyright (C) 2010 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 "platform/UserGestureIndicator.h"
#include "wtf/Assertions.h"
#include "wtf/CurrentTime.h"
namespace blink {
namespace {
// User gestures timeout in 1 second.
const double userGestureTimeout = 1.0;
// For out of process tokens we allow a 10 second delay.
const double userGestureOutOfProcessTimeout = 10.0;
class GestureToken final : public UserGestureToken {
WTF_MAKE_NONCOPYABLE(GestureToken);
public:
static PassRefPtr<UserGestureToken> create() { return adoptRef(new GestureToken); }
~GestureToken() final {}
bool hasGestures() const override
{
// Do not enforce timeouts for gestures which spawned javascript prompts or debugger pause.
if (m_consumableGestures < 1 || (!m_javascriptPrompt && !m_pauseInDebugger && hasTimedOut(m_outOfProcess ? userGestureOutOfProcessTimeout : userGestureTimeout)))
return false;
return true;
}
void addGesture()
{
m_consumableGestures++;
m_timestamp = WTF::currentTime();
}
void resetTimestamp()
{
m_timestamp = WTF::currentTime();
}
bool consumeGesture()
{
if (!m_consumableGestures)
return false;
m_consumableGestures--;
return true;
}
void setOutOfProcess() final
{
if (!hasTimedOut(userGestureTimeout) && hasGestures())
m_outOfProcess = true;
}
void setJavascriptPrompt() final
{
if (!hasTimedOut(userGestureTimeout) && hasGestures())
m_javascriptPrompt = true;
}
void setPauseInDebugger() final
{
if (!hasTimedOut(userGestureTimeout) && hasGestures())
m_pauseInDebugger = true;
}
private:
GestureToken()
: m_consumableGestures(0)
, m_timestamp(0)
, m_outOfProcess(false)
, m_javascriptPrompt(false)
, m_pauseInDebugger(false)
{
}
bool hasTimedOut(double timeout) const
{
return WTF::currentTime() - m_timestamp > timeout;
}
size_t m_consumableGestures;
double m_timestamp;
bool m_outOfProcess;
bool m_javascriptPrompt;
bool m_pauseInDebugger;
};
bool isDefinite(ProcessingUserGestureState state)
{
return state == DefinitelyProcessingNewUserGesture || state == DefinitelyProcessingUserGesture || state == DefinitelyNotProcessingUserGesture;
}
bool isDefiniteUserGesture(ProcessingUserGestureState state)
{
return state == DefinitelyProcessingNewUserGesture || state == DefinitelyProcessingUserGesture;
}
} // namespace
ProcessingUserGestureState UserGestureIndicator::s_state = DefinitelyNotProcessingUserGesture;
UserGestureIndicator* UserGestureIndicator::s_topmostIndicator = 0;
bool UserGestureIndicator::s_processedUserGestureSinceLoad = false;
UserGestureIndicator::UserGestureIndicator(ProcessingUserGestureState state)
: m_previousState(DefinitelyNotProcessingUserGesture)
{
// Silently ignore UserGestureIndicators on non-main threads.
if (!isMainThread())
return;
m_previousState = s_state;
// We overwrite s_state only if the caller is definite about the gesture state.
if (isDefinite(state)) {
if (!s_topmostIndicator) {
s_topmostIndicator = this;
m_token = GestureToken::create();
} else {
m_token = currentToken();
}
s_state = state;
}
if (state == DefinitelyProcessingNewUserGesture) {
static_cast<GestureToken*>(m_token.get())->addGesture();
s_processedUserGestureSinceLoad = true;
} else if (state == DefinitelyProcessingUserGesture && s_topmostIndicator == this) {
static_cast<GestureToken*>(m_token.get())->addGesture();
s_processedUserGestureSinceLoad = true;
}
ASSERT(isDefinite(s_state));
}
UserGestureIndicator::UserGestureIndicator(PassRefPtr<UserGestureToken> token)
: m_previousState(DefinitelyNotProcessingUserGesture)
{
// Silently ignore UserGestureIndicators on non-main threads.
if (!isMainThread())
return;
m_previousState = s_state;
if (token) {
static_cast<GestureToken*>(token.get())->resetTimestamp();
if (!s_topmostIndicator) {
s_topmostIndicator = this;
m_token = token;
} else {
m_token = currentToken();
if (static_cast<GestureToken*>(token.get())->hasGestures()) {
static_cast<GestureToken*>(m_token.get())->addGesture();
static_cast<GestureToken*>(token.get())->consumeGesture();
}
}
s_state = DefinitelyProcessingUserGesture;
}
ASSERT(isDefinite(s_state));
}
UserGestureIndicator::~UserGestureIndicator()
{
if (!isMainThread())
return;
s_state = m_previousState;
if (s_topmostIndicator == this)
s_topmostIndicator = nullptr;
ASSERT(isDefinite(s_state));
}
// static
bool UserGestureIndicator::processingUserGesture()
{
if (auto* token = currentToken()) {
ASSERT(isMainThread());
return isDefiniteUserGesture(s_state) && static_cast<GestureToken*>(token)->hasGestures();
}
return false;
}
// static
bool UserGestureIndicator::consumeUserGesture()
{
if (auto* token = currentToken()) {
ASSERT(isMainThread());
return static_cast<GestureToken*>(token)->consumeGesture();
}
return false;
}
// static
UserGestureToken* UserGestureIndicator::currentToken()
{
if (!isMainThread() || !s_topmostIndicator)
return nullptr;
return s_topmostIndicator->m_token.get();
}
// static
void UserGestureIndicator::clearProcessedUserGestureSinceLoad()
{
if (isMainThread())
s_processedUserGestureSinceLoad = false;
}
// static
bool UserGestureIndicator::processedUserGestureSinceLoad()
{
if (!isMainThread())
return false;
return s_processedUserGestureSinceLoad;
}
} // namespace blink
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