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      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_TOUCH_EVENT_STREAM_VALIDATOR
      6 #define CONTENT_COMMON_INPUT_TOUCH_EVENT_STREAM_VALIDATOR
      7 
      8 #include <string>
      9 
     10 #include "base/basictypes.h"
     11 #include "third_party/WebKit/public/web/WebInputEvent.h"
     12 
     13 namespace content {
     14 
     15 // Utility class for validating a stream of WebTouchEvents.
     16 class TouchEventStreamValidator {
     17  public:
     18   TouchEventStreamValidator();
     19   ~TouchEventStreamValidator();
     20 
     21   // If |event| is valid for the current stream, returns true.
     22   // Otherwise, returns false with a corresponding error message.
     23   bool Validate(const blink::WebTouchEvent& event, std::string* error_msg);
     24 
     25  private:
     26   blink::WebTouchEvent previous_event_;
     27 
     28   DISALLOW_COPY_AND_ASSIGN(TouchEventStreamValidator);
     29 };
     30 
     31 }  // namespace content
     32 
     33 #endif  // CONTENT_COMMON_INPUT_TOUCH_EVENT_STREAM_VALIDATOR
     34