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 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_ = 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 68
