content/common/input/gesture_event_stream_validator.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CONTENT_COMMON_INPUT_GESTURE_EVENT_STREAM_VALIDATOR
   6 #define CONTENT_COMMON_INPUT_GESTURE_EVENT_STREAM_VALIDATOR
   7
   8 #include <string>
   9
  10 #include "base/basictypes.h"
  11
  12 namespace blink {
  13 class WebGestureEvent;
  14 }
  15
  16 namespace content {
  17
  18 // Utility class for validating a stream of WebGestureEvents.
  19 class GestureEventStreamValidator {
  20  public:
  21   GestureEventStreamValidator();
  22   ~GestureEventStreamValidator();
  23
  24   // If |event| is valid for the current stream, returns true.
  25   // Otherwise, returns false with a corresponding error message.
  26   bool Validate(const blink::WebGestureEvent& event, std::string* error_msg);
  27
  28  private:
  29   bool scrolling_;
  30   bool pinching_;
  31   bool waiting_for_tap_end_;
  32
  33   DISALLOW_COPY_AND_ASSIGN(GestureEventStreamValidator);
  34 };
  35
  36 }  // namespace content
  37
  38 #endif  // CONTENT_COMMON_INPUT_GESTURE_EVENT_STREAM_VALIDATOR