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// Copyright 2014 The Chromium Authors
// 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_configuration.h"
#include "base/android/build_info.h"
#include "base/memory/singleton.h"
#include "ui/base/ui_base_features.h"
#include "ui/display/screen.h"
#include "ui/gfx/android/view_configuration.h"
using gfx::ViewConfiguration;
namespace ui {
namespace {
// Touch radii on Android can be both noisy and inaccurate. The old Java
// gesture detection pipeline used a fixed value of 24 as the gesture bounds.
// We relax that value somewhat, but not by much; there's a fairly small window
// within which gesture bounds are useful for features like touch adjustment.
constexpr float kMinGestureBoundsLengthDips = 20.f;
constexpr float kMaxGestureBoundsLengthDips = 32.f;
class GestureConfigurationAndroid : public GestureConfiguration {
public:
GestureConfigurationAndroid(const GestureConfigurationAndroid&) = delete;
GestureConfigurationAndroid& operator=(const GestureConfigurationAndroid&) =
delete;
~GestureConfigurationAndroid() override = default;
static GestureConfigurationAndroid* GetInstance() {
return base::Singleton<GestureConfigurationAndroid>::get();
}
private:
GestureConfigurationAndroid() : GestureConfiguration() {
set_double_tap_enabled(true);
set_double_tap_timeout_in_ms(ViewConfiguration::GetDoubleTapTimeoutInMs());
// TODO(jdduke): Enable this on Android M after the implicit conflict with
// stylus selection is resolved.
set_stylus_scale_enabled(false);
set_gesture_begin_end_types_enabled(
base::FeatureList::IsEnabled(features::kEnableGestureBeginEndTypes));
set_long_press_time_in_ms(ViewConfiguration::GetLongPressTimeoutInMs());
set_max_distance_between_taps_for_double_tap(
ViewConfiguration::GetDoubleTapSlopInDips());
set_max_fling_velocity(
ViewConfiguration::GetMaximumFlingVelocityInDipsPerSecond());
set_max_gesture_bounds_length(kMaxGestureBoundsLengthDips);
set_max_touch_move_in_pixels_for_click(
ViewConfiguration::GetTouchSlopInDips());
set_max_stylus_move_in_pixels_for_click(
ViewConfiguration::GetTouchSlopInDips() * 1.5f);
set_min_fling_velocity(
ViewConfiguration::GetMinimumFlingVelocityInDipsPerSecond());
set_min_gesture_bounds_length(kMinGestureBoundsLengthDips);
set_min_pinch_update_span_delta(0.f);
set_min_scaling_span_in_pixels(
ViewConfiguration::GetMinScalingSpanInDips());
set_show_press_delay_in_ms(ViewConfiguration::GetTapTimeoutInMs());
set_span_slop(ViewConfiguration::GetTouchSlopInDips() * 2.f);
set_fling_touchscreen_tap_suppression_enabled(true);
set_fling_touchpad_tap_suppression_enabled(false);
set_fling_max_cancel_to_down_time_in_ms(
ViewConfiguration::GetTapTimeoutInMs());
set_fling_max_tap_gap_time_in_ms(
ViewConfiguration::GetLongPressTimeoutInMs());
// Android ViewConfiguration doesn't have a short-press timeout. We are
// using the heuristic that it would be 100ms less than the long-press
// provided this is not too close with show-press.
//
// TODO(crbug.com/40820457): Replace this with platform-defined
// timeout when available.
set_short_press_time(base::Milliseconds(
std::max(long_press_time_in_ms() - 100, long_press_time_in_ms() / 2)));
}
friend struct base::DefaultSingletonTraits<GestureConfigurationAndroid>;
};
} // namespace
// Create a GestureConfigurationAura singleton instance when using Android.
GestureConfiguration* GestureConfiguration::GetPlatformSpecificInstance() {
return GestureConfigurationAndroid::GetInstance();
}
} // namespace ui
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