Sync ui/events to chromium @ https://codereview.chromium.org/1210203002

ui/events/gesture_detection/gesture_provider_config_helper.cc

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ui/events/gesture_detection/gesture_provider_config_helper.h"
+
+#include "ui/events/gesture_detection/gesture_configuration.h"
+#include "ui/gfx/screen.h"
+
+namespace ui {
+namespace {
+
+class GenericDesktopGestureConfiguration : public GestureConfiguration {
+ public:
+  // The default GestureConfiguration parameters are already tailored for a
+  // desktop environment (Aura).
+  GenericDesktopGestureConfiguration() {}
+  ~GenericDesktopGestureConfiguration() override {}
+};
+
+GestureDetector::Config BuildGestureDetectorConfig(
+    const GestureConfiguration& gesture_config) {
+  GestureDetector::Config config;
+  config.longpress_timeout =
+      base::TimeDelta::FromMilliseconds(gesture_config.long_press_time_in_ms());
+  config.showpress_timeout = base::TimeDelta::FromMilliseconds(
+      gesture_config.show_press_delay_in_ms());
+  config.double_tap_timeout = base::TimeDelta::FromMilliseconds(
+      gesture_config.double_tap_timeout_in_ms());
+  config.touch_slop = gesture_config.max_touch_move_in_pixels_for_click();
+  config.double_tap_slop =
+      gesture_config.max_distance_between_taps_for_double_tap();
+  config.minimum_fling_velocity = gesture_config.min_fling_velocity();
+  config.maximum_fling_velocity = gesture_config.max_fling_velocity();
+  config.swipe_enabled = gesture_config.swipe_enabled();
+  config.minimum_swipe_velocity = gesture_config.min_swipe_velocity();
+  config.maximum_swipe_deviation_angle =
+      gesture_config.max_swipe_deviation_angle();
+  config.two_finger_tap_enabled = gesture_config.two_finger_tap_enabled();
+  config.two_finger_tap_max_separation =
+      gesture_config.max_distance_for_two_finger_tap_in_pixels();
+  config.two_finger_tap_timeout = base::TimeDelta::FromMilliseconds(
+      gesture_config.max_touch_down_duration_for_click_in_ms());
+  config.velocity_tracker_strategy = gesture_config.velocity_tracker_strategy();
+  return config;
+}
+
+ScaleGestureDetector::Config BuildScaleGestureDetectorConfig(
+    const GestureConfiguration& gesture_config) {
+  ScaleGestureDetector::Config config;
+  config.span_slop = gesture_config.span_slop();
+  config.min_scaling_touch_major = gesture_config.min_scaling_touch_major();
+  config.min_scaling_span = gesture_config.min_scaling_span_in_pixels();
+  config.min_pinch_update_span_delta =
+      gesture_config.min_pinch_update_span_delta();
+  return config;
+}
+
+GestureProvider::Config BuildGestureProviderConfig(
+    const GestureConfiguration& gesture_config) {
+  GestureProvider::Config config;
+  config.gesture_detector_config = BuildGestureDetectorConfig(gesture_config);
+  config.scale_gesture_detector_config =
+      BuildScaleGestureDetectorConfig(gesture_config);
+  config.double_tap_support_for_platform_enabled =
+      gesture_config.double_tap_enabled();
+  config.gesture_begin_end_types_enabled =
+      gesture_config.gesture_begin_end_types_enabled();
+  config.min_gesture_bounds_length = gesture_config.min_gesture_bounds_length();
+  config.max_gesture_bounds_length = gesture_config.max_gesture_bounds_length();
+  return config;
+}
+
+}  // namespace
+
+GestureProvider::Config GetGestureProviderConfig(
+    GestureProviderConfigType type) {
+  GestureProvider::Config config;
+  switch (type) {
+    case GestureProviderConfigType::CURRENT_PLATFORM:
+      config = BuildGestureProviderConfig(*GestureConfiguration::GetInstance());
+      break;
+    case GestureProviderConfigType::GENERIC_DESKTOP:
+      config = BuildGestureProviderConfig(GenericDesktopGestureConfiguration());
+      break;
+    case GestureProviderConfigType::GENERIC_MOBILE:
+      // The default GestureProvider::Config embeds a mobile configuration.
+      break;
+  }
+
+  gfx::Screen* screen = gfx::Screen::GetScreenByType(gfx::SCREEN_TYPE_NATIVE);
+  // |screen| is sometimes NULL during tests.
+  if (screen)
+    config.display = screen->GetPrimaryDisplay();
+
+  return config;
+}
+
+}  // namespace ui