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_H_
   6 #define CONTENT_COMMON_INPUT_GESTURE_EVENT_STREAM_VALIDATOR_H_
   7
   8 #include <string>
   9
  10 #include "base/basictypes.h"
  11 #include "content/common/content_export.h"
  12
  13 namespace blink {
  14 class WebGestureEvent;
  15 }
  16
  17 namespace content {
  18
  19 // Utility class for validating a stream of WebGestureEvents.
  20 class CONTENT_EXPORT GestureEventStreamValidator {
  21  public:
  22   GestureEventStreamValidator();
  23   ~GestureEventStreamValidator();
  24
  25   // If |event| is valid for the current stream, returns true.
  26   // Otherwise, returns false with a corresponding error message.
  27   bool Validate(const blink::WebGestureEvent& event, std::string* error_msg);
  28
  29  private:
  30   bool scrolling_;
  31   bool pinching_;
  32   bool waiting_for_tap_end_;
  33
  34   DISALLOW_COPY_AND_ASSIGN(GestureEventStreamValidator);
  35 };
  36
  37 }  // namespace content
  38
  39 #endif  // CONTENT_COMMON_INPUT_GESTURE_EVENT_STREAM_VALIDATOR_H_