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content/browser/renderer_host/input/content_gesture_provider.h

Index: content/browser/renderer_host/input/content_gesture_provider.h
diff --git a/content/browser/renderer_host/input/content_gesture_provider.h b/content/browser/renderer_host/input/content_gesture_provider.h
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+// 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.
+
+#ifndef CONTENT_BROWSER_RENDERER_HOST_INPUT_CONTENT_GESTURE_PROVIDER_H_
+#define CONTENT_BROWSER_RENDERER_HOST_INPUT_CONTENT_GESTURE_PROVIDER_H_
+
+#include "base/basictypes.h"
+#include "content/port/common/input_event_ack_state.h"
+#include "ui/events/gesture_detection/gesture_event_data_packet.h"
+#include "ui/events/gesture_detection/gesture_provider.h"
+#include "ui/events/gesture_detection/touch_disposition_gesture_filter.h"
+
+namespace blink {
+class WebGestureEvent;
+}
+
+namespace content {
+
+class ContentGestureProviderClient {
+ public:
+  virtual ~ContentGestureProviderClient() {}
+  virtual void OnGestureEvent(const blink::WebGestureEvent& event) = 0;
+};
+
+// Provides gesture detection and dispatch given a sequence of touch events
+// and touch event acks.
+class ContentGestureProvider : public ui::TouchDispositionGestureFilterClient,
+                               public ui::GestureProviderClient {
+ public:
+  // TODO(jdduke): Move the scaling constant out of this class, instead hosting
+  // it on the generating MotionEvent.
+  ContentGestureProvider(ContentGestureProviderClient* client,
+                         float touch_to_gesture_scale);
+
+  // Returns true if |event| was both valid and successfully handled by the
+  // gesture detector.  Otherwise, returns false, in which case the caller
+  // should drop |event|, not forwarding it to the renderer.
+  bool OnTouchEvent(const ui::MotionEvent& event);
+
+  // To be called upon ack of an event that was forwarded after a successful
+  // call to |OnTouchEvent()|.
+  void OnTouchEventAck(InputEventAckState ack_state);
+
+  // Methods delegated to |gesture_provider_|.
+  void ResetGestureDetectors();
+  void CancelActiveTouchSequence();
+  void SetMultiTouchSupportEnabled(bool enabled);
+  void SetDoubleTapSupportForPlatformEnabled(bool enabled);
+  void SetDoubleTapSupportForPageEnabled(bool enabled);
+
+ private:
+  // ui::GestureProviderClient
+  virtual void OnGestureEvent(const ui::GestureEventData& event) OVERRIDE;
+
+  // TouchDispositionGestureFilterClient
+  virtual void ForwardGestureEvent(const ui::GestureEventData& event) OVERRIDE;
+
+  ContentGestureProviderClient* const client_;
+  float touch_to_gesture_scale_;
+
+  ui::GestureProvider gesture_provider_;
+  ui::TouchDispositionGestureFilter gesture_filter_;
+
+  bool handling_event_;
+  ui::GestureEventDataPacket pending_gesture_packet_;
+
+  DISALLOW_COPY_AND_ASSIGN(ContentGestureProvider);
+};
+
+}  // namespace content
+
+#endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_CONTENT_GESTURE_PROVIDER_H_