blob: a6229f98b6995fc3c3622e46e51108debbad41a9 [file] [log] [blame]
// 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.
#include "content/common/input/gesture_event_stream_validator.h"
#include "base/logging.h"
#include "third_party/WebKit/public/web/WebInputEvent.h"
using blink::WebInputEvent;
namespace content {
GestureEventStreamValidator::GestureEventStreamValidator()
: scrolling_(false), pinching_(false), waiting_for_tap_end_(false) {
}
GestureEventStreamValidator::~GestureEventStreamValidator() {
}
bool GestureEventStreamValidator::Validate(const blink::WebGestureEvent& event,
std::string* error_msg) {
DCHECK(error_msg);
error_msg->clear();
switch (event.type) {
case WebInputEvent::GestureScrollBegin:
if (scrolling_ || pinching_)
error_msg->append("Scroll begin during scroll\n");
scrolling_ = true;
break;
case WebInputEvent::GestureScrollUpdate:
case WebInputEvent::GestureScrollUpdateWithoutPropagation:
if (!scrolling_)
error_msg->append("Scroll update outside of scroll\n");
break;
case WebInputEvent::GestureScrollEnd:
case WebInputEvent::GestureFlingStart:
if (!scrolling_)
error_msg->append("Scroll end outside of scroll\n");
if (pinching_)
error_msg->append("Ending scroll while pinching\n");
scrolling_ = false;
break;
case WebInputEvent::GesturePinchBegin:
if (!scrolling_)
error_msg->append("Pinch begin outside of scroll\n");
if (pinching_)
error_msg->append("Pinch begin during pinch\n");
pinching_ = true;
break;
case WebInputEvent::GesturePinchUpdate:
if (!pinching_ || !scrolling_)
error_msg->append("Pinch update outside of pinch\n");
break;
case WebInputEvent::GesturePinchEnd:
if (!pinching_ || !scrolling_)
error_msg->append("Pinch end outside of pinch\n");
pinching_ = false;
break;
case WebInputEvent::GestureTapDown:
if (waiting_for_tap_end_)
error_msg->append("Missing tap end event\n");
waiting_for_tap_end_ = true;
break;
case WebInputEvent::GestureTap:
case WebInputEvent::GestureTapCancel:
case WebInputEvent::GestureDoubleTap:
if (!waiting_for_tap_end_)
error_msg->append("Missing GestureTapDown event\n");
waiting_for_tap_end_ = false;
break;
default:
break;
}
return error_msg->empty();
}
} // namespace content