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1 // Copyright (c) 2013 The Chromium Authors. All rights reserved. | 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 | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #include "ui/events/gestures/gesture_configuration.h" | 5 #include "ui/events/gestures/gesture_configuration.h" |
6 | 6 |
7 namespace ui { | 7 namespace ui { |
8 | 8 |
9 int GestureConfiguration::default_radius_ = 25; | 9 int GestureConfiguration::default_radius_ = 25; |
10 int GestureConfiguration::fling_max_cancel_to_down_time_in_ms_ = 400; | 10 int GestureConfiguration::fling_max_cancel_to_down_time_in_ms_ = 400; |
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27 double GestureConfiguration::min_flick_speed_squared_ = 550.f * 550.f; | 27 double GestureConfiguration::min_flick_speed_squared_ = 550.f * 550.f; |
28 double GestureConfiguration::min_pinch_update_distance_in_pixels_ = 5; | 28 double GestureConfiguration::min_pinch_update_distance_in_pixels_ = 5; |
29 double GestureConfiguration::min_rail_break_velocity_ = 200; | 29 double GestureConfiguration::min_rail_break_velocity_ = 200; |
30 double GestureConfiguration::min_scroll_delta_squared_ = 4 * 4; | 30 double GestureConfiguration::min_scroll_delta_squared_ = 4 * 4; |
31 float GestureConfiguration::min_scroll_velocity_ = 30.0f; | 31 float GestureConfiguration::min_scroll_velocity_ = 30.0f; |
32 double GestureConfiguration::min_swipe_speed_ = 20; | 32 double GestureConfiguration::min_swipe_speed_ = 20; |
33 double GestureConfiguration::scroll_prediction_seconds_ = 0.03; | 33 double GestureConfiguration::scroll_prediction_seconds_ = 0.03; |
34 double | 34 double |
35 GestureConfiguration::min_touch_down_duration_in_seconds_for_click_ = 0.01; | 35 GestureConfiguration::min_touch_down_duration_in_seconds_for_click_ = 0.01; |
36 | 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 | 37 // The number of points used in the linear regression which determines |
42 // touch velocity. Velocity is reported for 2 or more touch move events. | 38 // touch velocity. Velocity is reported for 2 or more touch move events. |
43 int GestureConfiguration::points_buffered_for_velocity_ = 8; | 39 int GestureConfiguration::points_buffered_for_velocity_ = 8; |
44 double GestureConfiguration::rail_break_proportion_ = 15; | 40 double GestureConfiguration::rail_break_proportion_ = 15; |
45 double GestureConfiguration::rail_start_proportion_ = 2; | 41 double GestureConfiguration::rail_start_proportion_ = 2; |
46 int GestureConfiguration::show_press_delay_in_ms_ = 150; | 42 int GestureConfiguration::show_press_delay_in_ms_ = 150; |
47 | 43 |
48 // Coefficients for a function that computes fling acceleration. | 44 // Coefficients for a function that computes fling acceleration. |
49 // These are empirically determined defaults. Do not adjust without | 45 // These are empirically determined defaults. Do not adjust without |
50 // additional empirical validation. | 46 // additional empirical validation. |
51 float GestureConfiguration::fling_acceleration_curve_coefficients_[ | 47 float GestureConfiguration::fling_acceleration_curve_coefficients_[ |
52 NumAccelParams] = { | 48 NumAccelParams] = { |
53 0.0166667f, | 49 0.0166667f, |
54 -0.0238095f, | 50 -0.0238095f, |
55 0.0452381f, | 51 0.0452381f, |
56 0.8f | 52 0.8f |
57 }; | 53 }; |
58 | 54 |
59 } // namespace ui | 55 } // namespace ui |
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