[Android] Perform eager gesture recognition on MotionEvents

content/browser/renderer_host/render_widget_host_view_android.cc

 // Copyright (c) 2012 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/browser/renderer_host/render_widget_host_view_android.h"
 
 #include <android/bitmap.h>
 
 #include "base/basictypes.h"
 #include "base/bind.h"
@@ skipping 1064 matching lines @@
     bool is_pinned_to_left, bool is_pinned_to_right) {
   // intentionally empty, like RenderWidgetHostViewViews
 }
 
 void RenderWidgetHostViewAndroid::UnhandledWheelEvent(
     const blink::WebMouseWheelEvent& event) {
   // intentionally empty, like RenderWidgetHostViewViews
 }
 
 void RenderWidgetHostViewAndroid::GestureEventAck(
-    int gesture_event_type,
+    const blink::WebGestureEvent& event,
     InputEventAckState ack_result) {
-  // Scroll events.
-  if (gesture_event_type == blink::WebInputEvent::GestureScrollBegin) {
+  if (event.type == blink::WebInputEvent::GestureScrollBegin) {
     content_view_core_->OnScrollBeginEventAck();
-  }
-  if (gesture_event_type == blink::WebInputEvent::GestureScrollUpdate &&
-      ack_result == INPUT_EVENT_ACK_STATE_CONSUMED) {
-    content_view_core_->OnScrollUpdateGestureConsumed();
-  }
-  if (gesture_event_type == blink::WebInputEvent::GestureScrollEnd) {
+  } else if (event.type == blink::WebInputEvent::GestureScrollUpdate) {
+    if (ack_result == INPUT_EVENT_ACK_STATE_CONSUMED)
+      content_view_core_->OnScrollUpdateGestureConsumed();
+  } else if (event.type == blink::WebInputEvent::GestureScrollEnd) {
     content_view_core_->OnScrollEndEventAck();
-  }
-
-  // Fling events.
-  if (gesture_event_type == blink::WebInputEvent::GestureFlingStart) {
-    content_view_core_->OnFlingStartEventAck(ack_result);
+  } else if (event.type == blink::WebInputEvent::GestureFlingStart) {
+    if (ack_result == INPUT_EVENT_ACK_STATE_NOT_CONSUMED ||
+        ack_result == INPUT_EVENT_ACK_STATE_NO_CONSUMER_EXISTS) {
+      const bool had_consumer =
+          ack_result == INPUT_EVENT_ACK_STATE_NOT_CONSUMED;
+      content_view_core_->OnUnhandledFlingStartEventAck(
+          had_consumer,
+          event.data.flingStart.velocityX,
+          event.data.flingStart.velocityY);
+    }
   }
 }
 
 InputEventAckState RenderWidgetHostViewAndroid::FilterInputEvent(
     const blink::WebInputEvent& input_event) {
   if (!host_)
     return INPUT_EVENT_ACK_STATE_NOT_CONSUMED;
 
   if (input_event.type == blink::WebInputEvent::GestureTapDown ||
       input_event.type == blink::WebInputEvent::TouchStart) {
@@ skipping 103 matching lines @@
   if (host_)
     host_->ForwardKeyboardEvent(event);
 }
 
 void RenderWidgetHostViewAndroid::SendTouchEvent(
     const blink::WebTouchEvent& event) {
   if (host_)
     host_->ForwardTouchEventWithLatencyInfo(event, CreateLatencyInfo(event));
 }
 
-
 void RenderWidgetHostViewAndroid::SendMouseEvent(
     const blink::WebMouseEvent& event) {
   if (host_)
     host_->ForwardMouseEvent(event);
 }
 
 void RenderWidgetHostViewAndroid::SendMouseWheelEvent(
     const blink::WebMouseWheelEvent& event) {
   if (host_)
     host_->ForwardWheelEvent(event);
@@ skipping 105 matching lines @@
       obj = content_view_core_->GetJavaObject();
     GetBrowserAccessibilityManager()->ToBrowserAccessibilityManagerAndroid()->
         SetContentViewCore(obj);
   }
 
   if (are_layers_attached_) {
     AttachLayers();
     if (content_view_core_ && !using_synchronous_compositor_)
       content_view_core_->GetWindowAndroid()->AddObserver(this);
   }
-
-  // Ensure ContentsViewCore is aware of the current touch handling state, eg.
-  // in case we've already been running JS for the page as part of preload.
-  if (content_view_core_ && host_)
-    content_view_core_->HasTouchEventHandlers(host_->has_touch_handler());
 }
 
 void RenderWidgetHostViewAndroid::RunAckCallbacks() {
   while (!ack_callbacks_.empty()) {
     ack_callbacks_.front().Run();
     ack_callbacks_.pop();
   }
 }
 
 void RenderWidgetHostViewAndroid::HasTouchEventHandlers(
     bool need_touch_events) {
-  if (content_view_core_)
-    content_view_core_->HasTouchEventHandlers(need_touch_events);
 }
 
 void RenderWidgetHostViewAndroid::OnCompositingDidCommit() {
   RunAckCallbacks();
 }
 
 void RenderWidgetHostViewAndroid::OnDetachCompositor() {
   DCHECK(content_view_core_);
   DCHECK(!using_synchronous_compositor_);
   RunAckCallbacks();
@@ skipping 109 matching lines @@
 // RenderWidgetHostView, public:
 
 // static
 RenderWidgetHostView*
 RenderWidgetHostView::CreateViewForWidget(RenderWidgetHost* widget) {
   RenderWidgetHostImpl* rwhi = RenderWidgetHostImpl::From(widget);
   return new RenderWidgetHostViewAndroid(rwhi, NULL);
 }
 
 } // namespace content