Send node transition events for touch events

third_party/WebKit/Source/core/events/PointerEventManager.cpp

-// Copyright 2015 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "core/events/PointerEventManager.h"
-
-namespace blink {
-
-namespace {
-
-inline int toInt(WebPointerProperties::PointerType t) { return static_cast<int>(t); }
-
-const char* pointerTypeNameForWebPointPointerType(WebPointerProperties::PointerType type)
-{
-    switch (type) {
-    case WebPointerProperties::PointerType::Unknown:
-        return "";
-    case WebPointerProperties::PointerType::Touch:
-        return "touch";
-    case WebPointerProperties::PointerType::Pen:
-        return "pen";
-    case WebPointerProperties::PointerType::Mouse:
-        return "mouse";
-    }
-    ASSERT_NOT_REACHED();
-    return "";
-}
-
-} // namespace
-
-const PointerEventManager::MappedId PointerEventManager::s_invalidId = 0;
-
-// Mouse id is 1 to behave the same as MS Edge for compatibility reasons.
-const PointerEventManager::MappedId PointerEventManager::s_mouseId = 1;
-
-EventTarget* PointerEventManager::getCapturingNode(PassRefPtrWillBeRawPtr<PointerEvent> pointerEvent)
-{
-    // TODO(nzolghadr): Add APIs to set the capturing nodes and return the correct node here
-    return nullptr;
-}
-
-float getPointerEventPressure(float force, int buttons)
-{
-    if (std::isnan(force))
-        return buttons ? 0.5 : 0;
-    return force;
-}
-
-void PointerEventManager::setIdAndType(PointerEventInit &pointerEventInit,
-    const WebPointerProperties &pointerProperties)
-{
-    const WebPointerProperties::PointerType pointerType = pointerProperties.pointerType;
-    MappedId pointerId = add(PointerEventManager::IncomingId(toInt(pointerType), pointerProperties.id));
-    pointerEventInit.setPointerId(pointerId);
-    pointerEventInit.setPointerType(pointerTypeNameForWebPointPointerType(pointerType));
-    pointerEventInit.setIsPrimary(isPrimary(pointerId));
-}
-
-PassRefPtrWillBeRawPtr<PointerEvent> PointerEventManager::create(const AtomicString& type,
-    const PlatformMouseEvent& mouseEvent,
-    PassRefPtrWillBeRawPtr<Node> relatedTarget,
-    PassRefPtrWillBeRawPtr<AbstractView> view)
-{
-    PointerEventInit pointerEventInit;
-
-    setIdAndType(pointerEventInit, mouseEvent.pointerProperties());
-
-    pointerEventInit.setScreenX(mouseEvent.globalPosition().x());
-    pointerEventInit.setScreenY(mouseEvent.globalPosition().y());
-    pointerEventInit.setClientX(mouseEvent.position().x());
-    pointerEventInit.setClientY(mouseEvent.position().y());
-
-    pointerEventInit.setButton(mouseEvent.button());
-    pointerEventInit.setButtons(MouseEvent::platformModifiersToButtons(mouseEvent.modifiers()));
-    pointerEventInit.setPressure(getPointerEventPressure(
-        mouseEvent.pointerProperties().force, pointerEventInit.buttons()));
-
-    UIEventWithKeyState::setFromPlatformModifiers(pointerEventInit, mouseEvent.modifiers());
-
-    pointerEventInit.setBubbles(type != EventTypeNames::pointerenter
-        && type != EventTypeNames::pointerleave);
-    pointerEventInit.setCancelable(type != EventTypeNames::pointerenter
-        && type != EventTypeNames::pointerleave && type != EventTypeNames::pointercancel);
-
-    pointerEventInit.setView(view);
-    if (relatedTarget)
-        pointerEventInit.setRelatedTarget(relatedTarget);
-
-    return PointerEvent::create(type, pointerEventInit);
-}
-
-PassRefPtrWillBeRawPtr<PointerEvent> PointerEventManager::create(const AtomicString& type,
-    const PlatformTouchPoint& touchPoint, PlatformEvent::Modifiers modifiers,
-    const double width, const double height,
-    const double clientX, const double clientY)
-{
-    const PlatformTouchPoint::State pointState = touchPoint.state();
-
-    bool pointerReleasedOrCancelled = pointState == PlatformTouchPoint::TouchReleased
-        || pointState == PlatformTouchPoint::TouchCancelled;
-
-    bool isEnterOrLeave = false;
-
-    PointerEventInit pointerEventInit;
-
-    setIdAndType(pointerEventInit, touchPoint.pointerProperties());
-
-    pointerEventInit.setWidth(width);
-    pointerEventInit.setHeight(height);
-    pointerEventInit.setTiltX(touchPoint.pointerProperties().tiltX);
-    pointerEventInit.setTiltY(touchPoint.pointerProperties().tiltY);
-    pointerEventInit.setScreenX(touchPoint.screenPos().x());
-    pointerEventInit.setScreenY(touchPoint.screenPos().y());
-    pointerEventInit.setClientX(clientX);
-    pointerEventInit.setClientY(clientY);
-    pointerEventInit.setButton(0);
-    pointerEventInit.setButtons(pointerReleasedOrCancelled ? 0 : 1);
-    pointerEventInit.setPressure(getPointerEventPressure(
-        touchPoint.force(), pointerEventInit.buttons()));
-
-    UIEventWithKeyState::setFromPlatformModifiers(pointerEventInit, modifiers);
-
-    pointerEventInit.setBubbles(!isEnterOrLeave);
-    pointerEventInit.setCancelable(!isEnterOrLeave && pointState != PlatformTouchPoint::TouchCancelled);
-
-    return PointerEvent::create(type, pointerEventInit);
-}
-
-
-PassRefPtrWillBeRawPtr<PointerEvent> PointerEventManager::createPointerCancel(const PlatformTouchPoint& touchPoint)
-{
-    PointerEventInit pointerEventInit;
-
-    setIdAndType(pointerEventInit, touchPoint.pointerProperties());
-
-    pointerEventInit.setBubbles(true);
-    pointerEventInit.setCancelable(false);
-
-    return PointerEvent::create(EventTypeNames::pointercancel, pointerEventInit);
-}
-
-PointerEventManager::PointerEventManager()
-{
-    clear();
-}
-
-PointerEventManager::~PointerEventManager()
-{
-    clear();
-}
-
-void PointerEventManager::clear()
-{
-    for (int type = 0; type <= toInt(WebPointerProperties::PointerType::LastEntry); type++) {
-        m_primaryId[type] = PointerEventManager::s_invalidId;
-        m_idCount[type] = 0;
-    }
-    m_idMapping.clear();
-    m_idReverseMapping.clear();
-
-    // Always add mouse pointer in initialization and never remove it.
-    // No need to add it to m_idMapping as it is not going to be used with the existing APIs
-    m_primaryId[toInt(WebPointerProperties::PointerType::Mouse)] = s_mouseId;
-    m_idReverseMapping.add(s_mouseId, IncomingId(toInt(WebPointerProperties::PointerType::Mouse), 0));
-
-    m_currentId = PointerEventManager::s_mouseId+1;
-}
-
-PointerEventManager::MappedId PointerEventManager::add(const IncomingId p)
-{
-    // Do not add extra mouse pointer as it was added in initialization
-    if (p.first == toInt(WebPointerProperties::PointerType::Mouse))
-        return s_mouseId;
-
-    int type = p.first;
-    if (m_idMapping.contains(p))
-        return m_idMapping.get(p);
-    // We do not handle the overflow of m_currentId as it should be very rare
-    MappedId mappedId = m_currentId++;
-    if (!m_idCount[type])
-        m_primaryId[type] = mappedId;
-    m_idCount[type]++;
-    m_idMapping.add(p, mappedId);
-    m_idReverseMapping.add(mappedId, p);
-    return static_cast<PointerEventManager::MappedId>(mappedId);
-}
-
-void PointerEventManager::remove(const PassRefPtrWillBeRawPtr<PointerEvent> pointerEvent)
-{
-    MappedId mappedId = pointerEvent->pointerId();
-    // Do not remove mouse pointer id as it should always be there
-    if (mappedId == s_mouseId || !m_idReverseMapping.contains(mappedId))
-        return;
-
-    IncomingId p = m_idReverseMapping.get(mappedId);
-    int type = p.first;
-    m_idReverseMapping.remove(mappedId);
-    m_idMapping.remove(p);
-    if (m_primaryId[type] == mappedId)
-        m_primaryId[type] = PointerEventManager::s_invalidId;
-    m_idCount[type]--;
-}
-
-bool PointerEventManager::isPrimary(PointerEventManager::MappedId mappedId) const
-{
-    if (!m_idReverseMapping.contains(mappedId))
-        return false;
-
-    IncomingId p = m_idReverseMapping.get(mappedId);
-    int type = p.first;
-    return m_primaryId[type] == mappedId;
-}
-
-
-} // namespace blink