| // 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_COMMON_INPUT_WEB_TOUCH_EVENT_TRAITS_H_ |
| #define CONTENT_COMMON_INPUT_WEB_TOUCH_EVENT_TRAITS_H_ |
| |
| #include "base/basictypes.h" |
| #include "content/common/input/scoped_web_input_event.h" |
| #include "third_party/WebKit/public/web/WebInputEvent.h" |
| |
| namespace content { |
| |
| // Utility class for performing operations on and with WebTouchEvents. |
| class CONTENT_EXPORT WebTouchEventTraits { |
| public: |
| // Returns whether all touches in the event have the specified state. |
| static bool AllTouchPointsHaveState(const blink::WebTouchEvent& event, |
| blink::WebTouchPoint::State state); |
| |
| // Returns whether this event represents a transition from no active |
| // touches to some active touches (the start of a new "touch sequence"). |
| static bool IsTouchSequenceStart(const blink::WebTouchEvent& event); |
| |
| // Sets the type of |event| to |type|, resetting any other type-specific |
| // properties and updating the timestamp. |
| static void ResetType(blink::WebInputEvent::Type type, |
| double timestamp_sec, |
| blink::WebTouchEvent* event); |
| |
| // Like ResetType but also resets the state of all active touches |
| // to match the event type. This is particularly useful, for example, |
| // in sending a touchcancel for all active touches. |
| static void ResetTypeAndTouchStates(blink::WebInputEvent::Type type, |
| double timestamp_sec, |
| blink::WebTouchEvent* event); |
| }; |
| |
| } // namespace content |
| |
| #endif // CONTENT_COMMON_INPUT_WEB_TOUCH_EVENT_TRAITS_H_ |