ui/events/gestures/gesture_configuration.cc

   1 // Copyright (c) 2013 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/gestures/gesture_configuration.h"
   6
   7 namespace ui {
   8
   9 int GestureConfiguration::default_radius_ = 25;
  10 int GestureConfiguration::fling_max_cancel_to_down_time_in_ms_ = 400;
  11 int GestureConfiguration::fling_max_tap_gap_time_in_ms_ = 200;
  12 float GestureConfiguration::fling_velocity_cap_ = 17000.0f;
  13 int GestureConfiguration::tab_scrub_activation_delay_in_ms_ = 200;
  14 double GestureConfiguration::long_press_time_in_seconds_ = 1.0;
  15 double GestureConfiguration::semi_long_press_time_in_seconds_ = 0.4;
  16 double GestureConfiguration::max_distance_for_two_finger_tap_in_pixels_ = 300;
  17 int GestureConfiguration::max_radius_ = 100;
  18 double GestureConfiguration::max_seconds_between_double_click_ = 0.7;
  19 double
  20   GestureConfiguration::max_separation_for_gesture_touches_in_pixels_ = 150;
  21 float GestureConfiguration::max_swipe_deviation_angle_ = 20;
  22 double
  23   GestureConfiguration::max_touch_down_duration_in_seconds_for_click_ = 0.8;
  24 double GestureConfiguration::max_touch_move_in_pixels_for_click_ = 15;
  25 double GestureConfiguration::max_distance_between_taps_for_double_tap_ = 20;
  26 double GestureConfiguration::min_distance_for_pinch_scroll_in_pixels_ = 20;
  27 double GestureConfiguration::min_flick_speed_squared_ = 550.f * 550.f;
  28 double GestureConfiguration::min_pinch_update_distance_in_pixels_ = 5;
  29 double GestureConfiguration::min_rail_break_velocity_ = 200;
  30 double GestureConfiguration::min_scroll_delta_squared_ = 4 * 4;
  31 float GestureConfiguration::min_scroll_velocity_ = 30.0f;
  32 double GestureConfiguration::min_swipe_speed_ = 20;
  33 double GestureConfiguration::scroll_prediction_seconds_ = 0.03;
  34 double
  35   GestureConfiguration::min_touch_down_duration_in_seconds_for_click_ = 0.01;
  36
  37 // If this is too small, we currently can get single finger pinch zoom. See
  38 // crbug.com/357237 for details.
  39 int GestureConfiguration::min_scaling_span_in_pixels_ = 125;
  40
  41 // The number of points used in the linear regression which determines
  42 // touch velocity. Velocity is reported for 2 or more touch move events.
  43 int GestureConfiguration::points_buffered_for_velocity_ = 8;
  44 double GestureConfiguration::rail_break_proportion_ = 15;
  45 double GestureConfiguration::rail_start_proportion_ = 2;
  46 int GestureConfiguration::show_press_delay_in_ms_ = 150;
  47
  48 // TODO(jdduke): Disable and remove entirely when issues with intermittent
  49 // scroll end detection on the Pixel are resolved, crbug.com/353702.
  50 #if defined(OS_CHROMEOS)
  51 int GestureConfiguration::scroll_debounce_interval_in_ms_ = 30;
  52 #else
  53 int GestureConfiguration::scroll_debounce_interval_in_ms_ = 0;
  54 #endif
  55
  56 // Coefficients for a function that computes fling acceleration.
  57 // These are empirically determined defaults. Do not adjust without
  58 // additional empirical validation.
  59 float GestureConfiguration::fling_acceleration_curve_coefficients_[
  60     NumAccelParams] = {
  61   0.0166667f,
  62   -0.0238095f,
  63   0.0452381f,
  64   0.8f
  65 };
  66
  67 }  // namespace ui