1 // Copyright 2014 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/gesture_detection/gesture_config_helper.h" 6 7 #include "ui/gfx/android/view_configuration.h" 8 #include "ui/gfx/screen.h" 9 10 using gfx::ViewConfiguration; 11 12 namespace ui { 13 namespace { 14 // TODO(jdduke): Adopt GestureConfiguration on Android, crbug/339203. 15 16 // This was the minimum tap/press size used on Android before the new gesture 17 // detection pipeline. 18 const float kMinGestureBoundsLengthDips = 24.f; 19 20 // This value is somewhat arbitrary, but provides a reasonable maximum 21 // approximating a large thumb depression. 22 const float kMaxGestureBoundsLengthDips = kMinGestureBoundsLengthDips * 4.f; 23 24 GestureDetector::Config DefaultGestureDetectorConfig( 25 const gfx::Display& display) { 26 GestureDetector::Config config; 27 28 config.longpress_timeout = base::TimeDelta::FromMilliseconds( 29 ViewConfiguration::GetLongPressTimeoutInMs()); 30 config.showpress_timeout = 31 base::TimeDelta::FromMilliseconds(ViewConfiguration::GetTapTimeoutInMs()); 32 config.double_tap_timeout = base::TimeDelta::FromMilliseconds( 33 ViewConfiguration::GetDoubleTapTimeoutInMs()); 34 35 const float px_to_dp = 1.f / display.device_scale_factor(); 36 config.touch_slop = 37 ViewConfiguration::GetTouchSlopInPixels() * px_to_dp; 38 config.double_tap_slop = 39 ViewConfiguration::GetDoubleTapSlopInPixels() * px_to_dp; 40 config.minimum_fling_velocity = 41 ViewConfiguration::GetMinimumFlingVelocityInPixelsPerSecond() * px_to_dp; 42 config.maximum_fling_velocity = 43 ViewConfiguration::GetMaximumFlingVelocityInPixelsPerSecond() * px_to_dp; 44 45 return config; 46 } 47 48 ScaleGestureDetector::Config DefaultScaleGestureDetectorConfig( 49 const gfx::Display& display) { 50 ScaleGestureDetector::Config config; 51 52 const float px_to_dp = 1.f / display.device_scale_factor(); 53 config.span_slop = ViewConfiguration::GetTouchSlopInPixels() * 2.f * px_to_dp; 54 config.min_scaling_touch_major = 55 ViewConfiguration::GetMinScalingTouchMajorInPixels() * px_to_dp; 56 config.min_scaling_span = 57 ViewConfiguration::GetMinScalingSpanInPixels() * px_to_dp; 58 config.min_pinch_update_span_delta = 0.f; 59 60 return config; 61 } 62 63 } // namespace 64 65 GestureProvider::Config DefaultGestureProviderConfig() { 66 GestureProvider::Config config; 67 config.display = gfx::Screen::GetNativeScreen()->GetPrimaryDisplay(); 68 config.gesture_detector_config = DefaultGestureDetectorConfig(config.display); 69 config.scale_gesture_detector_config = 70 DefaultScaleGestureDetectorConfig(config.display); 71 config.gesture_begin_end_types_enabled = false; 72 config.min_gesture_bounds_length = kMinGestureBoundsLengthDips; 73 config.max_gesture_bounds_length = kMaxGestureBoundsLengthDips; 74 return config; 75 } 76 77 } // namespace ui 78
