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
  16 // Touch radii on Android can be both noisy and inaccurate. The old Java
  17 // gesture detection pipeline used a fixed value of 24 as the gesture bounds.
  18 // We relax that value somewhat, but not by much; there's a fairly small window
  19 // within which gesture bounds are useful for features like touch adjustment.
  20 const float kMinGestureBoundsLengthDips = 20.f;
  21 const float kMaxGestureBoundsLengthDips = 32.f;
  22
  23 class GestureConfigurationAndroid : public GestureConfiguration {
  24  public:
  25   ~GestureConfigurationAndroid() override {
  26   }
  27
  28   static GestureConfigurationAndroid* GetInstance() {
  29     return base::Singleton<GestureConfigurationAndroid>::get();
  30   }
  31
  32  private:
  33   GestureConfigurationAndroid() : GestureConfiguration() {
  34     set_double_tap_enabled(true);
  35     set_double_tap_timeout_in_ms(ViewConfiguration::GetDoubleTapTimeoutInMs());
  36     set_gesture_begin_end_types_enabled(false);
  37     set_long_press_time_in_ms(ViewConfiguration::GetLongPressTimeoutInMs());
  38     set_max_distance_between_taps_for_double_tap(
  39         ViewConfiguration::GetDoubleTapSlopInDips());
  40     set_max_fling_velocity(
  41         ViewConfiguration::GetMaximumFlingVelocityInDipsPerSecond());
  42     set_max_gesture_bounds_length(kMaxGestureBoundsLengthDips);
  43     set_max_touch_move_in_pixels_for_click(
  44         ViewConfiguration::GetTouchSlopInDips());
  45     set_min_fling_velocity(
  46         ViewConfiguration::GetMinimumFlingVelocityInDipsPerSecond());
  47     set_min_gesture_bounds_length(kMinGestureBoundsLengthDips);
  48     set_min_pinch_update_span_delta(0.f);
  49     set_min_scaling_span_in_pixels(
  50         ViewConfiguration::GetMinScalingSpanInDips());
  51     set_min_scaling_touch_major(
  52         ViewConfiguration::GetMinScalingTouchMajorInDips());
  53     set_show_press_delay_in_ms(ViewConfiguration::GetTapTimeoutInMs());
  54     set_span_slop(ViewConfiguration::GetTouchSlopInDips() * 2.f);
  55     set_fling_touchscreen_tap_suppression_enabled(true);
  56     set_fling_touchpad_tap_suppression_enabled(false);
  57     set_fling_max_cancel_to_down_time_in_ms(
  58         ViewConfiguration::GetTapTimeoutInMs());
  59     set_fling_max_tap_gap_time_in_ms(
  60         ViewConfiguration::GetLongPressTimeoutInMs());
  61   }
  62
  63   friend struct base::DefaultSingletonTraits<GestureConfigurationAndroid>;
  64   DISALLOW_COPY_AND_ASSIGN(GestureConfigurationAndroid);
  65 };
  66
  67 }  // namespace
  68
  69 // Create a GestureConfigurationAura singleton instance when using Android.
  70 GestureConfiguration* GestureConfiguration::GetPlatformSpecificInstance() {
  71   return GestureConfigurationAndroid::GetInstance();
  72 }
  73
  74 }  // namespace ui