Remove user gesture tracking

sky/engine/platform/UserGestureIndicator.cpp

-/*
- * 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 "sky/engine/config.h"
-#include "sky/engine/platform/UserGestureIndicator.h"
-
-#include "sky/engine/wtf/Assertions.h"
-#include "sky/engine/wtf/CurrentTime.h"
-#include "sky/engine/wtf/MainThread.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 : public UserGestureToken {
-public:
-    static PassRefPtr<UserGestureToken> create() { return adoptRef(new GestureToken); }
-
-    virtual ~GestureToken() { }
-    virtual bool hasGestures() const override
-    {
-        // Do not enforce timeouts for gestures which spawned javascript prompts.
-        if (m_consumableGestures < 1 || (WTF::currentTime() - m_timestamp > (m_outOfProcess ? userGestureOutOfProcessTimeout : userGestureTimeout) && !m_javascriptPrompt))
-            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;
-    }
-
-    virtual void setOutOfProcess() override
-    {
-        if (WTF::currentTime() - m_timestamp > userGestureTimeout)
-            return;
-        if (hasGestures())
-            m_outOfProcess = true;
-    }
-
-    virtual void setJavascriptPrompt() override
-    {
-        if (WTF::currentTime() - m_timestamp > userGestureTimeout)
-            return;
-        if (hasGestures())
-            m_javascriptPrompt = true;
-    }
-
-private:
-    GestureToken()
-        : m_consumableGestures(0)
-        , m_timestamp(0)
-        , m_outOfProcess(false)
-        , m_javascriptPrompt(false)
-    {
-    }
-
-    size_t m_consumableGestures;
-    double m_timestamp;
-    bool m_outOfProcess;
-    bool m_javascriptPrompt;
-};
-
-}
-
-static bool isDefinite(ProcessingUserGestureState state)
-{
-    return state == DefinitelyProcessingNewUserGesture || state == DefinitelyProcessingUserGesture || state == DefinitelyNotProcessingUserGesture;
-}
-
-ProcessingUserGestureState UserGestureIndicator::s_state = DefinitelyNotProcessingUserGesture;
-UserGestureIndicator* UserGestureIndicator::s_topmostIndicator = 0;
-bool UserGestureIndicator::s_processedUserGestureSinceLoad = false;
-
-UserGestureIndicator::UserGestureIndicator(ProcessingUserGestureState state)
-    : m_previousState(s_state)
-{
-    // Silently ignore UserGestureIndicators on non-main threads.
-    if (!isMainThread())
-        return;
-
-    // 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 = s_topmostIndicator->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(s_state)
-{
-    // Silently ignore UserGestureIndicators on non-main threads.
-    if (!isMainThread())
-        return;
-
-    if (token) {
-        static_cast<GestureToken*>(token.get())->resetTimestamp();
-        if (!s_topmostIndicator) {
-            s_topmostIndicator = this;
-            m_token = token;
-        } else {
-            m_token = s_topmostIndicator->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 = 0;
-    ASSERT(isDefinite(s_state));
-}
-
-bool UserGestureIndicator::processingUserGesture()
-{
-    if (!isMainThread())
-        return false;
-    return s_topmostIndicator && static_cast<GestureToken*>(s_topmostIndicator->currentToken())->hasGestures() && (s_state == DefinitelyProcessingNewUserGesture || s_state == DefinitelyProcessingUserGesture);
-}
-
-bool UserGestureIndicator::consumeUserGesture()
-{
-    if (!isMainThread() || !s_topmostIndicator)
-        return false;
-    return static_cast<GestureToken*>(s_topmostIndicator->currentToken())->consumeGesture();
-}
-
-UserGestureToken* UserGestureIndicator::currentToken()
-{
-    if (!isMainThread() || !s_topmostIndicator)
-        return 0;
-    return s_topmostIndicator->m_token.get();
-}
-
-void UserGestureIndicator::clearProcessedUserGestureSinceLoad()
-{
-    if (isMainThread())
-        s_processedUserGestureSinceLoad = false;
-}
-
-bool UserGestureIndicator::processedUserGestureSinceLoad()
-{
-    if (!isMainThread())
-        return false;
-    return s_processedUserGestureSinceLoad;
-}
-
-UserGestureIndicatorDisabler::UserGestureIndicatorDisabler()
-    : m_savedState(UserGestureIndicator::s_state)
-    , m_savedIndicator(UserGestureIndicator::s_topmostIndicator)
-{
-    RELEASE_ASSERT(isMainThread());
-    UserGestureIndicator::s_state = DefinitelyNotProcessingUserGesture;
-    UserGestureIndicator::s_topmostIndicator = 0;
-}
-
-UserGestureIndicatorDisabler::~UserGestureIndicatorDisabler()
-{
-    RELEASE_ASSERT(isMainThread());
-    UserGestureIndicator::s_state = m_savedState;
-    UserGestureIndicator::s_topmostIndicator = m_savedIndicator;
-}
-
-}