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/window_tree_host_manager.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 WindowTreeHostManager::Observer {
  22  public:
  23   TouchTransformerController();
  24   ~TouchTransformerController() override;
  25
  26   // Updates the TouchTransformer for touch device and pushes the new
  27   // TouchTransformer into device manager.
  28   void UpdateTouchTransformer() const;
  29
  30   // WindowTreeHostManager::Observer:
  31   void OnDisplaysInitialized() override;
  32   void OnDisplayConfigurationChanged() override;
  33
  34  private:
  35   FRIEND_TEST_ALL_PREFIXES(TouchTransformerControllerTest,
  36                            MirrorModeLetterboxing);
  37   FRIEND_TEST_ALL_PREFIXES(TouchTransformerControllerTest,
  38                            MirrorModePillarboxing);
  39   FRIEND_TEST_ALL_PREFIXES(TouchTransformerControllerTest, SoftwareMirrorMode);
  40   FRIEND_TEST_ALL_PREFIXES(TouchTransformerControllerTest, ExtendedMode);
  41   FRIEND_TEST_ALL_PREFIXES(TouchTransformerControllerTest, TouchRadiusScale);
  42
  43   // Returns a transform that will be used to change an event's location from
  44   // the touchscreen's coordinate system into |display|'s coordinate system.
  45   // The transform is also responsible for properly scaling the display if the
  46   // display supports panel fitting.
  47   //
  48   // On X11 events are reported in framebuffer coordinate space, so the
  49   // |framebuffer_size| is used for scaling.
  50   // On Ozone events are reported in the touchscreen's resolution, so
  51   // |touch_display| is used to determine the size and scale the event.
  52   gfx::Transform GetTouchTransform(const DisplayInfo& display,
  53                                    const DisplayInfo& touch_display,
  54                                    const ui::TouchscreenDevice& touchscreen,
  55                                    const gfx::Size& framebuffer_size) const;
  56
  57   // Returns the scaling factor for the touch radius such that it scales the
  58   // radius from |touch_device|'s coordinate system to the |touch_display|'s
  59   // coordinate system.
  60   double GetTouchResolutionScale(
  61       const DisplayInfo& touch_display,
  62       const ui::TouchscreenDevice& touch_device) const;
  63
  64   // For the provided |display| update the touch radius mapping.
  65   void UpdateTouchRadius(const DisplayInfo& display) const;
  66
  67   // For a given |target_display| and |target_display_id| update the touch
  68   // transformation based on the touchscreen associated with |touch_display|.
  69   // |target_display_id| is the display id whose root window will receive the
  70   // touch events.
  71   // |touch_display| is the physical display that has the touchscreen
  72   // from which the events arrive.
  73   // |target_display| provides the dimensions to which the touch event will be
  74   // transformed.
  75   void UpdateTouchTransform(int64_t target_display_id,
  76                             const DisplayInfo& touch_display,
  77                             const DisplayInfo& target_display) const;
  78
  79   DISALLOW_COPY_AND_ASSIGN(TouchTransformerController);
  80 };
  81
  82 }  // namespace ash
  83
  84 #endif  // ASH_TOUCH_TOUCH_TRANSFORMER_CONTROLLER_H_