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