Touch emulator: allow multiple touch streams.

content/common/input/web_touch_event_traits.cc

 // Copyright 2014 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.
 
 #include "content/common/input/web_touch_event_traits.h"
 
 #include "base/logging.h"
 
 using blink::WebInputEvent;
 using blink::WebTouchEvent;
@@ skipping 13 matching lines @@
   return true;
 }
 
 bool WebTouchEventTraits::IsTouchSequenceStart(const WebTouchEvent& event) {
   DCHECK(event.touchesLength);
   if (event.type != WebInputEvent::TouchStart)
     return false;
   return AllTouchPointsHaveState(event, blink::WebTouchPoint::StatePressed);
 }
 
+bool WebTouchEventTraits::IsTouchSequenceEnd(const WebTouchEvent& event) {
+  if (event.type != WebInputEvent::TouchEnd &&
+      event.type != WebInputEvent::TouchCancel)
+    return false;
+  if (!event.touchesLength)
+    return true;
+  for (size_t i = 0; i < event.touchesLength; ++i) {
+    if (event.touches[i].state != blink::WebTouchPoint::StateReleased &&
+        event.touches[i].state != blink::WebTouchPoint::StateCancelled)
+      return false;
+  }
+  return true;
+}
+
 void WebTouchEventTraits::ResetType(WebInputEvent::Type type,
                                     double timestamp_sec,
                                     WebTouchEvent* event) {
   DCHECK(WebInputEvent::isTouchEventType(type));
   event->type = type;
   event->cancelable = (type != WebInputEvent::TouchCancel);
   event->timeStampSeconds = timestamp_sec;
 }
 
 void WebTouchEventTraits::ResetTypeAndTouchStates(WebInputEvent::Type type,
@@ skipping 17 matching lines @@
       break;
     default:
       NOTREACHED();
       break;
   }
   for (size_t i = 0; i < event->touchesLength; ++i)
     event->touches[i].state = newState;
 }
 
 }  // namespace content