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// Copyright (c) 2013 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 ASH_DISPLAY_EVENT_TRANSFORMATION_HANDLER_H_
#define ASH_DISPLAY_EVENT_TRANSFORMATION_HANDLER_H_
#include "ash/ash_export.h"
#include "base/compiler_specific.h"
#include "base/macros.h"
#include "ui/events/event_handler.h"
namespace ash {
// An event filter that transforms input event properties in extended desktop
// environment.
class ASH_EXPORT EventTransformationHandler : public ui::EventHandler {
public:
enum TransformationMode {
TRANSFORM_AUTO, // Transform events by the default amount.
// 1. Linear scaling w.r.t. the device scale factor.
// 2. Add 20% more for non-integrated displays.
TRANSFORM_NONE, // No transformation.
};
EventTransformationHandler();
~EventTransformationHandler() override;
void set_transformation_mode(TransformationMode transformation_mode) {
transformation_mode_ = transformation_mode;
}
// Overridden from ui::EventHandler.
void OnScrollEvent(ui::ScrollEvent* event) override;
private:
TransformationMode transformation_mode_;
DISALLOW_COPY_AND_ASSIGN(EventTransformationHandler);
};
} // namespace ash
#endif // ASH_DISPLAY_EVENT_TRANSFORMATION_HANDLER_H_