Suppressed MEs for gestures from cancelled PEs

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

 // 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.
 
 #ifndef PointerEventManager_h
 #define PointerEventManager_h
 
 #include "core/CoreExport.h"
 #include "core/events/PointerEvent.h"
 #include "core/events/PointerEventFactory.h"
@@ skipping 47 matching lines @@
     void clear();
 
     void elementRemoved(EventTarget*);
     void setPointerCapture(int, EventTarget*);
     void releasePointerCapture(int, EventTarget*);
     bool isActive(const int) const;
 
     // Returns whether there is any touch on the screen.
     bool isAnyTouchActive() const;
 
+    // Returns true if the primary pointerdown corresponding to the given
+    // |uniqueTouchEventId| was canceled. Also drops stale ids from
+    // |m_touchIdsForCanceledPointerdowns|.
+    bool primaryPointerdownCanceled(uint32_t uniqueTouchEventId);
+
 private:
     typedef HeapHashMap<int, Member<EventTarget>, WTF::IntHash<int>,
         WTF::UnsignedWithZeroKeyHashTraits<int>> PointerCapturingMap;
     class EventTargetAttributes {
         DISALLOW_NEW_EXCEPT_PLACEMENT_NEW();
     public:
         DEFINE_INLINE_TRACE()
         {
             visitor->trace(target);
         }
@@ skipping 76 matching lines @@
 
     // 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_preventMouseEventForPointerType[static_cast<size_t>(WebPointerProperties::PointerType::LastEntry) + 1];
 
     // Set upon sending a pointercancel for touch, prevents PE dispatches for touches until
     // all touch-points become inactive.
     bool m_inCanceledStateForPointerTypeTouch;
 
+    Deque<uint32_t> m_touchIdsForCanceledPointerdowns;
+
     // 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.
     using NodeUnderPointerMap = HeapHashMap<int, EventTargetAttributes,
         WTF::IntHash<int>, WTF::UnsignedWithZeroKeyHashTraits<int>>;
     NodeUnderPointerMap m_nodeUnderPointer;
 
     PointerCapturingMap m_pointerCaptureTarget;
     PointerCapturingMap m_pendingPointerCaptureTarget;
+
     PointerEventFactory m_pointerEventFactory;
     TouchEventManager m_touchEventManager;
-
 };
 
 } // namespace blink
 
 #endif // PointerEventManager_h