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/base/gestures/gesture_configuration.h" 6 7 namespace ui { 8 9 int GestureConfiguration::default_radius_ = 15; 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 double GestureConfiguration::max_swipe_deviation_ratio_ = 3; 22 double 23 GestureConfiguration::max_touch_down_duration_in_seconds_for_click_ = 0.8; 24 double GestureConfiguration::max_touch_move_in_pixels_for_click_ = 10; 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 int GestureConfiguration::min_scroll_successive_velocity_events_ = 3; 32 float GestureConfiguration::min_scroll_velocity_ = 30.0f; 33 double GestureConfiguration::min_swipe_speed_ = 20; 34 double GestureConfiguration::scroll_prediction_seconds_ = 0.03; 35 double 36 GestureConfiguration::min_touch_down_duration_in_seconds_for_click_ = 0.01; 37 38 // The number of points used in the linear regression which determines 39 // touch velocity. Velocity is reported for 2 or more touch move events. 40 int GestureConfiguration::points_buffered_for_velocity_ = 8; 41 double GestureConfiguration::rail_break_proportion_ = 15; 42 double GestureConfiguration::rail_start_proportion_ = 2; 43 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_[ 48 NumAccelParams] = { 49 0.0166667f, 50 -0.0238095f, 51 0.0452381f, 52 0.8f 53 }; 54 55 } // namespace ui 56
