Send got/lostpointercapture immediately if possible

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 52 matching lines @@
     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);
 
+    // Try to immediately send the got/lostpointercapture without boundary
+    // events.

[haraken, 2016/07/21 15:08:09]

Why is it okay to not dispatch boundary events?

[Navid Zolghadr, 2016/07/21 19:17:22]

There was this discussion to change the way we send boundary eventssent while a
pointer is captured in the pointer event working group. As the result when
sending a got/lostpointercatpure we don't need to send any boundary events and
just by changing the hittested node of the events the boundary events will be
sent via some other flow.

+    // TODO(crbug.com/629935): This function should be private as soon as PointerEventManager
+    // a GC managed object and postTask can be done internally in this class.
+    void immediatelyProcessPendingPointerCapture(int pointerId);
+
 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 60 matching lines @@
     void removeTargetFromPointerCapturingMapping(
         PointerCapturingMap&, const EventTarget*);
     EventTarget* getEffectiveTargetForPointerEvent(
         EventTarget*, int);
     EventTarget* getCapturingNode(int);
     void removePointer(PointerEvent*);
     WebInputEventResult dispatchPointerEvent(
         EventTarget*,
         PointerEvent*,
         bool checkForListener = false);
-    void releasePointerCapture(int);
+    void modifyPendingPointerCapture(int pointerId, EventTarget*);
+    // Returns true if capture target and pending capture target were different.
+    bool getPointerCaptureState(int pointerId,
+        EventTarget** pointerCaptureTarget,
+        EventTarget** pendingPointerCaptureTarget);
 
     // NOTE: If adding a new field to this class please ensure that it is
     // cleared in |PointerEventManager::clear()|.
 
     const Member<LocalFrame> m_frame;
 
     // 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];
@@ skipping 15 matching lines @@
     PointerCapturingMap m_pointerCaptureTarget;
     PointerCapturingMap m_pendingPointerCaptureTarget;
 
     PointerEventFactory m_pointerEventFactory;
     TouchEventManager m_touchEventManager;
 };
 
 } // namespace blink
 
 #endif // PointerEventManager_h