Remove WebTouchEvent from TouchEventManager APIs

third_party/WebKit/Source/core/input/TouchEventManager.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 TouchEventManager_h
 #define TouchEventManager_h
 
 #include "core/CoreExport.h"
 #include "core/events/PointerEventFactory.h"
 #include "core/input/EventHandlingUtil.h"
 #include "platform/graphics/TouchAction.h"
 #include "platform/wtf/Allocator.h"
 #include "platform/wtf/HashMap.h"
 #include "platform/wtf/Vector.h"
+#include "public/platform/WebCoalescedInputEvent.h"
 #include "public/platform/WebInputEventResult.h"
-#include "public/platform/WebTouchPoint.h"
+#include "public/platform/WebPointerEvent.h"
+#include "public/platform/WebTouchEvent.h"
 
 namespace blink {
 
 class LocalFrame;
 class Document;
-class WebTouchEvent;
 
 // This class takes care of dispatching all touch events and
 // maintaining related states.
 class CORE_EXPORT TouchEventManager
     : public GarbageCollectedFinalized<TouchEventManager> {
   WTF_MAKE_NONCOPYABLE(TouchEventManager);
 
  public:
 
   explicit TouchEventManager(LocalFrame&);
   DECLARE_TRACE();
 
-  // The entries in touch point array of WebTouchEvent (i.e. first parameter)
-  // correspond to the entries of the PointerEventTargets (i.e. last parameter).
-  WebInputEventResult HandleTouchEvent(
-      const WebTouchEvent&,
-      const Vector<WebTouchEvent>&,
-      const HeapVector<EventHandlingUtil::PointerEventTarget>&);
+  void HandleTouchPoint(const WebPointerEvent&,
+                        const Vector<WebPointerEvent>&,
+                        const EventHandlingUtil::PointerEventTarget&);
+
+  WebInputEventResult FlushEvents();
 
   // Resets the internal state of this object.
   void Clear();
 
   // Returns whether there is any touch on the screen.
   bool IsAnyTouchActive() const;
 
  private:
-  Touch* CreateDomTouch(const WebTouchPoint&, bool* known_target);
+  // Class represending one touch point event with its coalesced events and
+  // related attributes.
+  class TouchPointAttributes
+      : public GarbageCollectedFinalized<TouchPointAttributes> {
+   public:
+    DEFINE_INLINE_TRACE() { visitor->Trace(target_); }
 
-  void UpdateTargetAndRegionMapsForTouchStart(
-      const WebTouchPoint&,
+    TouchPointAttributes() {}
+    explicit TouchPointAttributes(WebPointerEvent event)
+        : event_(event), stale_(false) {}
+
+    // Last state of the touch point.
+    WebPointerEvent event_;
+    // The list of coalesced events of the touch point represented by this class
+    // if there is any. Note that at the end of each frame this list gets
+    // cleared and the touch point |stale_| flag will be true for the next frame
+    // unless more new events arrives for this touch point.
+    Vector<WebPointerEvent> coalesced_events_;
+    Member<Node> target_;  // The target of each active touch point.
+    String region_;        //  // The region of each active touch point.
+    bool stale_;
+  };
+
+  WebCoalescedInputEvent GenerateWebCoalescedInputEvent();
+  Touch* CreateDomTouch(const TouchPointAttributes*, bool* known_target);
+  void allTouchesReleasedCleanup();
+
+  // Keeps track of attributes of the touch point in the
+  // |touch_points_attributes_| map and does the hit-testing if the original hit
+  // test result was not inside capturing frame |touch_sequence_document_| for
+  // touch events.
+  void UpdateTouchAttributeMapsForPointerDown(
+      const WebPointerEvent&,
       const EventHandlingUtil::PointerEventTarget&);
 
-  // Does the hit-testing if the original hit test result was not inside
-  // capturing frame for touch events. Returns true if touch events could be
-  // dispatched and otherwise returns false.
-  bool HitTestTouchPointsIfNeeded(
-      const WebTouchEvent&,
-      const HeapVector<EventHandlingUtil::PointerEventTarget>&);
-
-  WebInputEventResult DispatchTouchEvents(const WebTouchEvent&,
-                                          const Vector<WebTouchEvent>&,
-                                          bool all_touches_released);
+  // This is triggered either by VSync signal to send one touch event per frame
+  // accumulating all move events or by discrete events pointerdown/up/cancel.
+  WebInputEventResult DispatchTouchEventFromAccumulatdTouchPoints();
 
   // NOTE: If adding a new field to this class please ensure that it is
   // cleared in |TouchEventManager::clear()|.
 
   const Member<LocalFrame> frame_;
 
-  // The target of each active touch point indexed by the touch ID.
-  using TouchTargetMap =
-      HeapHashMap<unsigned,
-                  Member<Node>,
-                  DefaultHash<unsigned>::Hash,
-                  WTF::UnsignedWithZeroKeyHashTraits<unsigned>>;
-  TouchTargetMap target_for_touch_id_;
-  using TouchRegionMap = HashMap<unsigned,
-                                 String,
-                                 DefaultHash<unsigned>::Hash,
-                                 WTF::UnsignedWithZeroKeyHashTraits<unsigned>>;
-  TouchRegionMap region_for_touch_id_;
+  // The attributes of each active touch point indexed by the touch ID.
+  using TouchAttributeMap =
+      HeapHashMap<int,
+                  Member<TouchPointAttributes>,
+                  WTF::IntHash<int>,
+                  WTF::UnsignedWithZeroKeyHashTraits<int>>;
+  TouchAttributeMap touch_attribute_map_;
 
   // If set, the document of the active touch sequence. Unset if no touch
   // sequence active.
   Member<Document> touch_sequence_document_;
 
-  bool touch_pressed_;
   bool suppressing_touchmoves_within_slop_;
 
+  // This is used to created a consistent sequence of coalesced events compared
+  // to the last frame.
+  WebTouchEvent last_coalesced_touch_event_;
+
   // The current touch action, computed on each touch start and is
   // a union of all touches. Reset when all touches are released.
   TouchAction current_touch_action_;
 };
 
 }  // namespace blink
 
 #endif  // TouchEventManager_h