[NOT FOR REVIEW] Patch demonstrating the changes required for browser side fling.

content/browser/renderer_host/input/fling/flinger.h

+// Copyright 2013 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_FLING_FLINGER_H_
+#define CONTENT_BROWSER_RENDERER_HOST_INPUT_FLING_FLINGER_H_
+
+#include "base/basictypes.h"
+#include "base/timer/timer.h"
+#include "content/browser/renderer_host/input/fling/fling_curve.h"
+#include "content/port/browser/event_with_latency_info.h"
+#include "content/port/common/input_event_ack_state.h"
+#include "third_party/WebKit/public/web/WebInputEvent.h"
+#include "ui/gfx/point.h"
+
+namespace content {
+class FlingerTest;
+class MockRenderWidgetHost;
+
+class FlingHelper {
+ public:
+  virtual ~FlingHelper() {}
+
+  virtual void SendEventForFling(const WebKit::WebInputEvent& event) = 0;
+  virtual void FlingFinished(WebKit::WebGestureEvent::SourceDevice source) = 0;
+};
+
+// Handles fling gestures.
+class CONTENT_EXPORT Flinger : public FlingCurveTarget {
+ public:
+  explicit Flinger(FlingHelper* helper);
+  virtual ~Flinger() {}
+
+  // Filters for fling (and related) events. Returns true if this event should
+  // not be processed any further.
+  bool HandleGestureEvent(const GestureEventWithLatencyInfo& gesture_event);
+
+  // Filters mouse events that may be just canceling an in-process fling.
+  bool HandleMouseEvent(const MouseEventWithLatencyInfo& mouse_event);
+
+  // Filters mouse events that may be just canceling an in-process fling.
+  bool HandleWheelEvent(const MouseWheelEventWithLatencyInfo& wheel_event);
+
+  // Filters key events that may be just canceling an in-process fling.
+  bool HandleKeyboardEvent();
+
+  void ProcessEventAck(WebKit::WebInputEvent::Type type,
+                       InputEventAckState ack_result,
+                       const ui::LatencyInfo& latency);
+
+ private:
+  friend class FlingerTest;
+  friend class MockRenderWidgetHost;
+
+  // Overridden from FlingCurveTarget.
+  virtual void ScrollBy(const gfx::PointF& delta) OVERRIDE;
+  virtual void NotifyCurrentFlingVelocity(const gfx::PointF& velocity) OVERRIDE;
+
+  void StartCurveTimer();
+  void CurveTimerFired();
+
+  void StopFlingAndCleanup();
+
+  FlingHelper* helper_;
+
+  scoped_ptr<FlingCurve> fling_curve_;
+
+  // Timer to send us ticks to send GSUs at during a fling.
+  // TODO(varunjain): Use vsync instead of this timer.
+  base::OneShotTimer<Flinger> curve_timer_;
+
+  bool fling_in_progress_;
+  bool ignore_next_tap_;
+  bool ignore_next_click_;
+  gfx::Point fling_start_position_;
+  gfx::Point fling_start_global_position_;
+  double fling_start_time_secs_;
+  int fling_modifier_;
+  WebKit::WebGestureEvent::SourceDevice fling_source_;
+
+  DISALLOW_COPY_AND_ASSIGN(Flinger);
+};
+
+}  // namespace content
+
+#endif // CONTENT_BROWSER_RENDERER_HOST_INPUT_FLING_FLINGER_H_