ash/touch/touch_transformer_controller.h

   1 // Copyright 2014 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_TOUCH_TOUCH_TRANSFORMER_CONTROLLER_H_
   6 #define ASH_TOUCH_TOUCH_TRANSFORMER_CONTROLLER_H_
   7
   8 #include "ash/ash_export.h"
   9 #include "ash/display/display_controller.h"
  10 #include "ui/gfx/transform.h"
  11
  12 namespace ui {
  13 struct TouchscreenDevice;
  14 }  // namespace ui
  15
  16 namespace ash {
  17
  18 // TouchTransformerController listens to display configuration change
  19 // and updates the touch transformation for touch displays.
  20 class ASH_EXPORT TouchTransformerController
  21     : public DisplayController::Observer {
  22  public:
  23   TouchTransformerController();
  24   virtual ~TouchTransformerController();
  25
  26   // Updates the TouchTransformer for touch device and pushes the new
  27   // TouchTransformer into device manager.
  28   void UpdateTouchTransformer() const;
  29
  30   // DisplayController::Observer:
  31   virtual void OnDisplaysInitialized() override;
  32   virtual void OnDisplayConfigurationChanged() override;
  33
  34  private:
  35   FRIEND_TEST_ALL_PREFIXES(TouchTransformerControllerTest,
  36                            TouchTransformerMirrorModeLetterboxing);
  37   FRIEND_TEST_ALL_PREFIXES(TouchTransformerControllerTest,
  38                            TouchTransformerMirrorModePillarboxing);
  39   FRIEND_TEST_ALL_PREFIXES(TouchTransformerControllerTest,
  40                            TouchTransformerExtendedMode);
  41   FRIEND_TEST_ALL_PREFIXES(TouchTransformerControllerTest,
  42                            TouchRadiusScale);
  43
  44   // Returns a transform that will be used to change an event's location from
  45   // the touchscreen's coordinate system into the display's coordinate system.
  46   // The transform is also responsible for properly scaling the display if the
  47   // display support panel fitting.
  48   //
  49   // On X11 events are reported in framebuffer coordinate space, so the
  50   // |framebuffer_size| is used for scaling.
  51   // On Ozone events are reported in the touchscreen's resolution, so
  52   // |touchscreen| is used to determine the size and scale the event.
  53   gfx::Transform GetTouchTransform(
  54       const DisplayInfo& display,
  55       const ui::TouchscreenDevice& touchscreen,
  56       const gfx::Size& framebuffer_size) const;
  57
  58   // Returns the scaling factor for the touch radius such that it scales the
  59   // radius from |touch_device|'s coordiante system to the |touch_display|'s
  60   // coordinate system.
  61   double GetTouchResolutionScale(
  62       const DisplayInfo& touch_display,
  63       const ui::TouchscreenDevice& touch_device) const;
  64
  65   DISALLOW_COPY_AND_ASSIGN(TouchTransformerController);
  66 };
  67
  68 }  // namespace ash
  69
  70 #endif  // ASH_TOUCH_TOUCH_TRANSFORMER_CONTROLLER_H_