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// Copyright 2015 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 COMPONENTS_HTML_VIEWER_TOUCH_HANDLER_H_
#define COMPONENTS_HTML_VIEWER_TOUCH_HANDLER_H_
#include "base/basictypes.h"
#include "ui/events/gesture_detection/filtered_gesture_provider.h"
namespace blink {
class WebWidget;
}
namespace mojo {
class Event;
}
namespace ui {
class MotionEventGeneric;
}
namespace html_viewer {
// TouchHandler is responsible for converting touch events into gesture events.
// It does this by converting mojo::Events into a MotionEventGeneric and using
// FilteredGestureProvider.
class TouchHandler : public ui::GestureProviderClient {
public:
explicit TouchHandler(blink::WebWidget* web_widget);
~TouchHandler() override;
void OnTouchEvent(const mojo::Event& event);
// ui::GestureProviderClient implementation.
void OnGestureEvent(const ui::GestureEventData& gesture) override;
private:
// Updates |current_motion_event_| from |event|. Returns true on success.
bool UpdateMotionEvent(const mojo::Event& event);
// Sends |current_motion_event_| to the GestureProvider and WebView.
void SendMotionEventToGestureProvider();
// Does post processing after sending |current_motion_event_| to the
// GestureProvider.
void PostProcessMotionEvent(const mojo::Event& event);
blink::WebWidget* web_widget_;
ui::FilteredGestureProvider gesture_provider_;
// As touch events are received they are converted to this event. If null no
// touch events are in progress.
scoped_ptr<ui::MotionEventGeneric> current_motion_event_;
DISALLOW_COPY_AND_ASSIGN(TouchHandler);
};
} // namespace html_viewer
#endif // COMPONENTS_HTML_VIEWER_TOUCH_HANDLER_H_
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