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// 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);
// Returns whether this event represents a transition from active
// touches to no active touches (the end of a "touch sequence").
static bool IsTouchSequenceEnd(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_
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