Create MouseEventManager and EventHandlingUtil

third_party/WebKit/Source/core/input/MouseEventManager.cpp

+// Copyright 2016 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/input/MouseEventManager.h"
+
+#include "core/dom/ElementTraversal.h"
+#include "core/events/MouseEvent.h"
+#include "core/html/HTMLCanvasElement.h"
+#include "core/input/EventHandlingUtil.h"
+
+namespace blink {
+
+namespace {
+
+PlatformMouseEvent mouseEventWithRegion(Node* node, const PlatformMouseEvent& mouseEvent)
+{
+    if (!node->isElementNode())
+        return mouseEvent;
+
+    Element* element = toElement(node);
+    if (!element->isInCanvasSubtree())
+        return mouseEvent;
+
+    HTMLCanvasElement* canvas = Traversal<HTMLCanvasElement>::firstAncestorOrSelf(*element);
+    // In this case, the event target is canvas and mouse rerouting doesn't happen.
+    if (canvas == element)
+        return mouseEvent;
+    String region = canvas->getIdFromControl(element);
+    PlatformMouseEvent newMouseEvent = mouseEvent;
+    newMouseEvent.setRegion(region);
+    return newMouseEvent;
+}
+
+} // namespace
+
+MouseEventManager::MouseEventBoundaryEventDispatcher::MouseEventBoundaryEventDispatcher(
+    MouseEventManager* mouseEventManager,
+    const PlatformMouseEvent& platformMouseEvent,
+    EventTarget* exitedTarget)
+    : m_mouseEventManager(mouseEventManager)
+    , m_platformMouseEvent(platformMouseEvent)
+    , m_exitedTarget(exitedTarget)
+{
+}
+
+void MouseEventManager::MouseEventBoundaryEventDispatcher::dispatchOut(
+    EventTarget* target, EventTarget* relatedTarget)
+{
+    dispatch(target, relatedTarget, EventTypeNames::mouseout, mouseEventWithRegion(m_exitedTarget->toNode(), m_platformMouseEvent), false);
+}
+
+void MouseEventManager::MouseEventBoundaryEventDispatcher::dispatchOver(
+    EventTarget* target, EventTarget* relatedTarget)
+{
+    dispatch(target, relatedTarget, EventTypeNames::mouseover, m_platformMouseEvent, false);
+}
+
+void MouseEventManager::MouseEventBoundaryEventDispatcher::dispatchLeave(
+    EventTarget* target, EventTarget* relatedTarget, bool checkForListener)
+{
+    dispatch(target, relatedTarget, EventTypeNames::mouseleave, mouseEventWithRegion(m_exitedTarget->toNode(), m_platformMouseEvent), checkForListener);
+}
+
+void MouseEventManager::MouseEventBoundaryEventDispatcher::dispatchEnter(
+    EventTarget* target, EventTarget* relatedTarget, bool checkForListener)
+{
+    dispatch(target, relatedTarget, EventTypeNames::mouseenter, m_platformMouseEvent, checkForListener);
+}
+
+void MouseEventManager::MouseEventBoundaryEventDispatcher::dispatch(
+    EventTarget* target, EventTarget* relatedTarget, const AtomicString& type,
+    const PlatformMouseEvent& platformMouseEvent, bool checkForListener)
+{
+    m_mouseEventManager->dispatchMouseEvent(target, type, platformMouseEvent,
+        relatedTarget, 0, checkForListener);
+}
+
+void MouseEventManager::sendBoundaryEvents(
+    EventTarget* exitedTarget,
+    EventTarget* enteredTarget,
+    const PlatformMouseEvent& mousePlatformEvent)
+{
+    MouseEventBoundaryEventDispatcher boundaryEventDispatcher(this, mousePlatformEvent, exitedTarget);
+    EventHandlingUtil::sendBoundaryEvents(exitedTarget, enteredTarget, &boundaryEventDispatcher);
+}
+
+WebInputEventResult MouseEventManager::dispatchMouseEvent(
+    EventTarget* target,
+    const AtomicString& mouseEventType,
+    const PlatformMouseEvent& mouseEvent,
+    EventTarget* relatedTarget,
+    int detail,
+    bool checkForListener)
+{
+    if (target && target->toNode()
+        && (!checkForListener || target->hasEventListeners(mouseEventType))) {
+        Node* targetNode = target->toNode();
+        MouseEvent* event = MouseEvent::create(mouseEventType,
+            targetNode->document().domWindow(), mouseEvent, detail,
+            relatedTarget ? relatedTarget->toNode() : nullptr);
+        DispatchEventResult dispatchResult = target->dispatchEvent(event);
+        return EventHandlingUtil::toWebInputEventResult(dispatchResult);
+    }
+    return WebInputEventResult::NotHandled;
+}
+
+MouseEventManager::MouseEventManager(LocalFrame* frame)
+    : m_frame(frame)
+{
+    clear();
+}
+
+MouseEventManager::~MouseEventManager()
+{
+}
+
+void MouseEventManager::clear()
+{
+}
+
+DEFINE_TRACE(MouseEventManager)
+{
+    visitor->trace(m_frame);
+    visitor->trace(m_nodeUnderMouse);
+}
+
+} // namespace blink