Send node transition events for touch events

third_party/WebKit/Source/core/input/PointerEventManager.h

+// 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.
+
+#ifndef PointerEventManager_h
+#define PointerEventManager_h
+
+#include "core/CoreExport.h"
+#include "core/events/PointerEvent.h"
+#include "core/events/PointerEventFactory.h"
+#include "public/platform/WebInputEventResult.h"
+#include "public/platform/WebPointerProperties.h"
+#include "wtf/Allocator.h"
+#include "wtf/HashMap.h"
+
+namespace blink {
+
+/**
+  This class takes care of dispatching all pointer events and keeps track of
+  properties of active pointer events.
+*/
+class CORE_EXPORT PointerEventManager {
+    DISALLOW_NEW();
+public:
+    PointerEventManager();
+    ~PointerEventManager();
+    DECLARE_TRACE();
+
+    WebInputEventResult sendMousePointerEvent(
+        PassRefPtrWillBeRawPtr<Node>, const AtomicString& type,
+        int clickCount, const PlatformMouseEvent&,
+        PassRefPtrWillBeRawPtr<Node> relatedTarget,
+        PassRefPtrWillBeRawPtr<AbstractView>);
+
+    // Returns whether the event is consumed or not
+    WebInputEventResult sendTouchPointerEvent(
+        PassRefPtrWillBeRawPtr<EventTarget>,
+        const PlatformTouchPoint&, PlatformEvent::Modifiers,
+        const double width, const double height,
+        const double clientX, const double clientY);
+
+    void sendTouchCancelPointerEvent(PassRefPtrWillBeRawPtr<EventTarget>,
+        const PlatformTouchPoint&);
+
+    // Sends node transition events (pointer|mouse)(out|leave|over|enter) to the corresponding targets
+    void sendNodeTransitionEvents(PassRefPtrWillBeRawPtr<Node> exitedNode,
+        PassRefPtrWillBeRawPtr<Node> enteredNode,
+        const PlatformMouseEvent&,
+        PassRefPtrWillBeRawPtr<AbstractView>);
+
+    // Clear all the existing ids.
+    void clear();
+
+    // May clear PREVENT MOUSE EVENT flag as per pointer event spec:
+    // https://w3c.github.io/pointerevents/#compatibility-mapping-with-mouse-events
+    void conditionallyEnableMouseEventForPointerTypeMouse(unsigned);
+
+
+private:
+    PassRefPtrWillBeRawPtr<Node> getEffectiveTargetForPointerEvent(
+        PassRefPtrWillBeRawPtr<Node>,
+        PassRefPtrWillBeRawPtr<PointerEvent>);
+    void sendNodeTransitionEvents(
+        PassRefPtrWillBeRawPtr<EventTarget> exitedTarget,
+        PassRefPtrWillBeRawPtr<EventTarget> enteredTarget,
+        PassRefPtrWillBeRawPtr<PointerEvent>,
+        const PlatformMouseEvent& = PlatformMouseEvent(),
+        bool sendMouseEvent = false);
+    void setNodeUnderPointer(PassRefPtrWillBeRawPtr<PointerEvent>,
+        PassRefPtrWillBeRawPtr<EventTarget>);
+
+    // Prevents firing mousedown, mousemove & mouseup in-between a canceled pointerdown and next pointerup/pointercancel.
+    // See "PREVENT MOUSE EVENT flag" in the spec:
+    //   https://w3c.github.io/pointerevents/#compatibility-mapping-with-mouse-events
+    bool m_preventMouseEventForPointerTypeMouse;
+
+    // Note that this map keeps track of node under pointer with id=1 as well
+    // which might be different than m_nodeUnderMouse in EventHandler. That one
+    // keeps track of any compatibility mouse event positions but this map for
+    // the pointer with id=1 is only taking care of true mouse related events.
+    WillBeHeapHashMap<int, RefPtrWillBeMember<EventTarget>> m_nodeUnderPointer;
+
+    PointerEventFactory m_pointerEventFactory;
+};
+
+} // namespace blink
+
+#endif // PointerEventManager_h