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"
 #include "core/input/TouchEventManager.h"
 #include "public/platform/WebInputEventResult.h"
 #include "public/platform/WebPointerProperties.h"
 #include "wtf/Allocator.h"
 #include "wtf/HashMap.h"
 
 namespace blink {
 
 class LocalFrame;
 
 // This class takes care of dispatching all pointer events and keeps track of
 // properties of active pointer events.
-class CORE_EXPORT PointerEventManager {
+class CORE_EXPORT PointerEventManager : public GarbageCollectedFinalized<EventHandler> {
     WTF_MAKE_NONCOPYABLE(PointerEventManager);
-    DISALLOW_NEW();
 public:
     explicit PointerEventManager(LocalFrame*);
     ~PointerEventManager();
     DECLARE_TRACE();
 
     WebInputEventResult sendMousePointerEvent(
         Node*, const AtomicString& type,
         int clickCount, const PlatformMouseEvent&,
         Node* relatedTarget,
         Node* lastNodeUnderMouse);
@@ skipping 85 matching lines @@
     // and sends the got/lostpointercapture events, as per the spec:
     // https://w3c.github.io/pointerevents/#process-pending-pointer-capture
     // Returns whether the pointer capture is changed. When pointer capture is changed,
     // this function will take care of boundary events.
     bool processPendingPointerCapture(
         PointerEvent*,
         EventTarget*,
         const PlatformMouseEvent& = PlatformMouseEvent(),
         bool sendMouseEvent = false);
 
+    // Try to immediately send the got/lostpointercapture without boundary
+    // events.
+    void immediatelyProcessPendingPointerCapture(int pointerId);
+
     // Processes the capture state of a pointer, updates node under
     // pointer, and sends corresponding boundary events for pointer if
     // setPointerPosition is true. It also sends corresponding boundary events
     // for mouse if sendMouseEvent is true.
     void processCaptureAndPositionOfPointerEvent(
         PointerEvent*,
         EventTarget* hitTestTarget,
         EventTarget* lastNodeUnderMouse = nullptr,
         const PlatformMouseEvent& = PlatformMouseEvent(),
         bool sendMouseEvent = false,
         bool setPointerPosition = true);
 
     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