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content/browser/renderer_host/input/touch_disposition_gesture_filter.h

Index: content/browser/renderer_host/input/touch_disposition_gesture_filter.h
diff --git a/content/browser/renderer_host/input/touch_disposition_gesture_filter.h b/content/browser/renderer_host/input/touch_disposition_gesture_filter.h
deleted file mode 100644
index 3872b47d9daf759f79c4d2ff8eaab94305cbf39d..0000000000000000000000000000000000000000
--- a/content/browser/renderer_host/input/touch_disposition_gesture_filter.h
+++ /dev/null
@@ -1,123 +0,0 @@
-// 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_TOUCH_DISPOSITION_GESTURE_FILTER_H_
-#define CONTENT_BROWSER_RENDERER_HOST_INPUT_TOUCH_DISPOSITION_GESTURE_FILTER_H_
-
-#include <queue>
-#include <set>
-
-#include "content/browser/renderer_host/input/gesture_event_packet.h"
-#include "content/common/content_export.h"
-#include "content/port/common/input_event_ack_state.h"
-#include "third_party/WebKit/public/web/WebInputEvent.h"
-
-namespace content {
-
-// Interface with which the |TouchDispositionGestureFilter| forwards gestures
-// for a given touch event.
-class CONTENT_EXPORT TouchDispositionGestureFilterClient {
- public:
-  virtual void ForwardGestureEvent(const blink::WebGestureEvent&) = 0;
-};
-
-// Given a stream of touch-derived gesture packets, produces a refined gesture
-// sequence based on the ack dispositions of the generating touch events.
-class CONTENT_EXPORT TouchDispositionGestureFilter {
- public:
-  explicit TouchDispositionGestureFilter(
-      TouchDispositionGestureFilterClient* client);
-  ~TouchDispositionGestureFilter();
-
-  // To be called upon production of touch-derived gestures by the platform,
-  // *prior* to the generating touch being forward to the renderer.  In
-  // particular, |packet| contains [0, n] gestures that correspond to a given
-  // touch event. It is imperative that a single packet is received for
-  // *each* touch event, even those that did not produce a gesture.
-  enum PacketResult {
-    SUCCESS,              // Packet successfully queued.
-    INVALID_PACKET_ORDER, // Packets were received in the wrong order, i.e.,
-                          // TOUCH_BEGIN should always precede other packets.
-    INVALID_PACKET_TYPE,  // Packet had an invalid type.
-  };
-  PacketResult OnGestureEventPacket(const GestureEventPacket& packet);
-
-  // To be called upon receipt of *all* touch event acks.
-  void OnTouchEventAck(InputEventAckState ack_state);
-
-  // Whether there are any active gesture sequences still queued in the filter.
-  bool IsEmpty() const;
-
- private:
-  // Utility class for tracking gesture events and dispositions for a single
-  // gesture sequence. A single sequence corresponds to all gestures created
-  // between the first finger down and the last finger up, including gestures
-  // generated by timeouts from a statinoary finger.
-  class GestureSequence {
-   public:
-    struct GestureHandlingState {
-      GestureHandlingState();
-      // True iff the sequence has had at least one touch acked.
-      bool seen_ack;
-      // True iff the sequence has had any touch down event consumed.
-      bool start_consumed;
-      // True iff the first ack received for this sequence reported that no
-      // consumer exists.
-      bool no_consumer;
-    };
-
-    GestureSequence();
-    ~GestureSequence();
-
-    void Push(const GestureEventPacket& packet);
-    void Pop();
-    const GestureEventPacket& Front() const;
-    void UpdateState(GestureEventPacket::GestureSource gesture_source,
-                     InputEventAckState ack_state);
-    bool IsEmpty() const;
-    const GestureHandlingState& state() const { return state_; };
-
-   private:
-    std::queue<GestureEventPacket> packets_;
-    GestureHandlingState state_;
-  };
-  bool IsGesturePrevented(blink::WebInputEvent::Type type,
-                          InputEventAckState current,
-                          const GestureSequence::GestureHandlingState& state)
-      const;
-
-  void UpdateAndDispatchPackets(GestureSequence* sequence,
-                                InputEventAckState ack_result);
-
-  void FilterAndSendPacket(
-      const GestureEventPacket& packet,
-      const GestureSequence::GestureHandlingState& sequence_state,
-      InputEventAckState ack_state);
-
-  void SendGesture(const blink::WebGestureEvent& gesture);
-  void CancelTapIfNecessary();
-  void CancelFlingIfNecessary();
-  GestureSequence& Head();
-  GestureSequence& Tail();
-
-  TouchDispositionGestureFilterClient* client_;
-  std::queue<GestureSequence> sequences_;
-
-  // If the previous gesture of a given type was dropped instead of being
-  // dispatched, its type will occur in this set. Cleared when a new touch
-  // sequence begins to be acked.
-  std::set<blink::WebInputEvent::Type> last_event_of_type_dropped_;
-
-  // Bookkeeping for inserting synthetic Gesture{Tap,Fling}Cancel events
-  // when necessary, e.g., GestureTapCancel when scrolling begins, or
-  // GestureFlingCancel when a user taps following a GestureFlingStart.
-  bool needs_tap_ending_event_;
-  bool needs_fling_ending_event_;
-
-  DISALLOW_COPY_AND_ASSIGN(TouchDispositionGestureFilter);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_RENDERER_HOST_INPUT_TOUCH_DISPOSITION_GESTURE_FILTER_H_