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.
5 #include "ui/events/gestures/gesture_configuration.h"
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;
20 GestureConfiguration::max_separation_for_gesture_touches_in_pixels_ = 150;
21 double GestureConfiguration::max_swipe_deviation_ratio_ = 3;
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;
35 GestureConfiguration::min_touch_down_duration_in_seconds_for_click_ = 0.01;
37 // The number of points used in the linear regression which determines
38 // touch velocity. Velocity is reported for 2 or more touch move events.
39 int GestureConfiguration::points_buffered_for_velocity_ = 8;
40 double GestureConfiguration::rail_break_proportion_ = 15;
41 double GestureConfiguration::rail_start_proportion_ = 2;
42 int GestureConfiguration::show_press_delay_in_ms_ = 150;
44 // Coefficients for a function that computes fling acceleration.
45 // These are empirically determined defaults. Do not adjust without
46 // additional empirical validation.
47 float GestureConfiguration::fling_acceleration_curve_coefficients_[