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