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      1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef ASH_DISPLAY_EVENT_TRANSFORMATION_HANDLER_H_
      6 #define ASH_DISPLAY_EVENT_TRANSFORMATION_HANDLER_H_
      7 
      8 #include "ash/ash_export.h"
      9 #include "base/compiler_specific.h"
     10 #include "ui/events/event_handler.h"
     11 
     12 namespace ash {
     13 
     14 namespace internal {
     15 
     16 // An event filter that transforms input event properties in extended desktop
     17 // environment.
     18 class ASH_EXPORT EventTransformationHandler : public ui::EventHandler {
     19  public:
     20   enum TransformationMode {
     21     TRANSFORM_AUTO,   // Transform events by the default amount.
     22                       // 1. Linear scaling w.r.t. the device scale factor.
     23                       // 2. Add 20% more for non-integrated displays.
     24     TRANSFORM_NONE,   // No transformation.
     25   };
     26 
     27   EventTransformationHandler();
     28   virtual ~EventTransformationHandler();
     29 
     30   void set_transformation_mode(TransformationMode transformation_mode) {
     31     transformation_mode_ = transformation_mode;
     32   }
     33 
     34   // Overridden from ui::EventHandler.
     35   virtual void OnScrollEvent(ui::ScrollEvent* event) OVERRIDE;
     36 #if defined(OS_CHROMEOS)
     37   virtual void OnTouchEvent(ui::TouchEvent* event) OVERRIDE;
     38 #endif  // defined(OS_CHROMEOS)
     39 
     40  private:
     41   TransformationMode transformation_mode_;
     42 
     43   DISALLOW_COPY_AND_ASSIGN(EventTransformationHandler);
     44 };
     45 
     46 }  // namespace internal
     47 }  // namespace ash
     48 
     49 #endif  // ASH_DISPLAY_EVENT_TRANSFORMATION_HANDLER_H_
     50