src/ui/events/gesture_detection/gesture_config_helper_android.cc

   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