// 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 "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(const EventTransformationHandler&) = delete; EventTransformationHandler& operator=(const EventTransformationHandler&) = delete; ~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_; }; } // namespace ash #endif // ASH_DISPLAY_EVENT_TRANSFORMATION_HANDLER_H_