Updating trunk VERSION from 2139.0 to 2140.0
[chromium-blink-merge.git] / ui / events / gesture_detection / gesture_config_helper_android.cc
blob0b23346bedaed0157a736a02f3297f1c40bd6279
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.
5 #include "ui/events/gesture_detection/gesture_config_helper.h"
7 #include "ui/gfx/android/view_configuration.h"
8 #include "ui/gfx/screen.h"
10 using gfx::ViewConfiguration;
12 namespace ui {
13 namespace {
14 // TODO(jdduke): Adopt GestureConfiguration on Android, crbug/339203.
16 // This was the minimum tap/press size used on Android before the new gesture
17 // detection pipeline.
18 const float kMinGestureBoundsLengthDips = 24.f;
20 // This value is somewhat arbitrary, but provides a reasonable maximum
21 // approximating a large thumb depression.
22 const float kMaxGestureBoundsLengthDips = kMinGestureBoundsLengthDips * 4.f;
24 GestureDetector::Config DefaultGestureDetectorConfig(
25 const gfx::Display& display) {
26 GestureDetector::Config config;
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());
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;
45 return config;
48 ScaleGestureDetector::Config DefaultScaleGestureDetectorConfig(
49 const gfx::Display& display) {
50 ScaleGestureDetector::Config config;
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;
60 return config;
63 } // namespace
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;
77 } // namespace ui