ui/events/gesture_detection/gesture_configuration_android.cc

   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 #include "ui/events/gesture_detection/gesture_configuration.h"
   6
   7 #include "ui/gfx/android/view_configuration.h"
   8 #include "ui/gfx/screen.h"
   9
  10 using gfx::ViewConfiguration;
  11
  12 namespace ui {
  13 namespace {
  14 // This was the minimum tap/press size used on Android before the new gesture
  15 // detection pipeline.
  16 const float kMinGestureBoundsLengthDips = 24.f;
  17
  18 // This value is somewhat arbitrary, but provides a reasonable maximum
  19 // approximating a large thumb depression.
  20 const float kMaxGestureBoundsLengthDips = kMinGestureBoundsLengthDips * 4.f;
  21
  22 class GestureConfigurationAndroid : public GestureConfiguration {
  23  public:
  24   ~GestureConfigurationAndroid() override {
  25   }
  26
  27   static GestureConfigurationAndroid* GetInstance() {
  28     return Singleton<GestureConfigurationAndroid>::get();
  29   }
  30
  31  private:
  32   GestureConfigurationAndroid() : GestureConfiguration() {
  33     float raw_pixel_to_dip_ratio = 1.f / gfx::Screen::GetNativeScreen()
  34                                        ->GetPrimaryDisplay()
  35                                        .device_scale_factor();
  36     set_double_tap_enabled(true);
  37     set_double_tap_timeout_in_ms(ViewConfiguration::GetDoubleTapTimeoutInMs());
  38     set_gesture_begin_end_types_enabled(false);
  39     set_long_press_time_in_ms(ViewConfiguration::GetLongPressTimeoutInMs());
  40     set_max_distance_between_taps_for_double_tap(
  41         ViewConfiguration::GetDoubleTapSlopInPixels() * raw_pixel_to_dip_ratio);
  42     set_max_fling_velocity(
  43         ViewConfiguration::GetMaximumFlingVelocityInPixelsPerSecond() *
  44         raw_pixel_to_dip_ratio);
  45     set_max_gesture_bounds_length(kMaxGestureBoundsLengthDips);
  46     set_max_touch_move_in_pixels_for_click(
  47         ViewConfiguration::GetTouchSlopInPixels() * raw_pixel_to_dip_ratio);
  48     set_min_fling_velocity(
  49         ViewConfiguration::GetMinimumFlingVelocityInPixelsPerSecond() *
  50         raw_pixel_to_dip_ratio);
  51     set_min_gesture_bounds_length(kMinGestureBoundsLengthDips);
  52     set_min_pinch_update_span_delta(0.f);
  53     set_min_scaling_span_in_pixels(
  54         ViewConfiguration::GetMinScalingSpanInPixels() *
  55         raw_pixel_to_dip_ratio);
  56     set_min_scaling_touch_major(
  57         ViewConfiguration::GetMinScalingTouchMajorInPixels() *
  58         raw_pixel_to_dip_ratio);
  59     set_show_press_delay_in_ms(ViewConfiguration::GetTapTimeoutInMs());
  60     set_span_slop(ViewConfiguration::GetTouchSlopInPixels() * 2.f *
  61                   raw_pixel_to_dip_ratio);
  62   }
  63
  64   friend struct DefaultSingletonTraits<GestureConfigurationAndroid>;
  65   DISALLOW_COPY_AND_ASSIGN(GestureConfigurationAndroid);
  66 };
  67
  68 }  // namespace
  69
  70 // Create a GestureConfigurationAura singleton instance when using Android.
  71 GestureConfiguration* GestureConfiguration::GetInstance() {
  72   return GestureConfigurationAndroid::GetInstance();
  73 }
  74
  75 }  // namespace ui