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// 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_configuration.h"
#include "ui/gfx/android/view_configuration.h"
#include "ui/gfx/screen.h"
using gfx::ViewConfiguration;
namespace ui {
namespace {
// This was the minimum tap/press size used on Android before the new gesture
// detection pipeline.
const float kMinGestureBoundsLengthDips = 24.f;
// This value is somewhat arbitrary, but provides a reasonable maximum
// approximating a large thumb depression.
const float kMaxGestureBoundsLengthDips = kMinGestureBoundsLengthDips * 4.f;
class GestureConfigurationAndroid : public GestureConfiguration {
public:
~GestureConfigurationAndroid() override {
}
static GestureConfigurationAndroid* GetInstance() {
return Singleton<GestureConfigurationAndroid>::get();
}
private:
GestureConfigurationAndroid() : GestureConfiguration() {
float raw_pixel_to_dip_ratio = 1.f / gfx::Screen::GetNativeScreen()
->GetPrimaryDisplay()
.device_scale_factor();
set_double_tap_timeout_in_ms(ViewConfiguration::GetDoubleTapTimeoutInMs());
set_gesture_begin_end_types_enabled(false);
set_long_press_time_in_ms(ViewConfiguration::GetLongPressTimeoutInMs());
set_max_distance_between_taps_for_double_tap(
ViewConfiguration::GetDoubleTapSlopInPixels() * raw_pixel_to_dip_ratio);
set_max_fling_velocity(
ViewConfiguration::GetMaximumFlingVelocityInPixelsPerSecond() *
raw_pixel_to_dip_ratio);
set_max_gesture_bounds_length(kMaxGestureBoundsLengthDips);
set_max_touch_move_in_pixels_for_click(
ViewConfiguration::GetTouchSlopInPixels() * raw_pixel_to_dip_ratio);
set_min_fling_velocity(
ViewConfiguration::GetMinimumFlingVelocityInPixelsPerSecond() *
raw_pixel_to_dip_ratio);
set_min_gesture_bounds_length(kMinGestureBoundsLengthDips);
set_min_pinch_update_span_delta(0.f);
set_min_scaling_span_in_pixels(
ViewConfiguration::GetMinScalingSpanInPixels() *
raw_pixel_to_dip_ratio);
set_min_scaling_touch_major(
ViewConfiguration::GetMinScalingTouchMajorInPixels() *
raw_pixel_to_dip_ratio);
set_show_press_delay_in_ms(ViewConfiguration::GetTapTimeoutInMs());
set_span_slop(ViewConfiguration::GetTouchSlopInPixels() * 2.f *
raw_pixel_to_dip_ratio);
}
friend struct DefaultSingletonTraits<GestureConfigurationAndroid>;
DISALLOW_COPY_AND_ASSIGN(GestureConfigurationAndroid);
};
} // namespace
// Create a GestureConfigurationAura singleton instance when using Android.
GestureConfiguration* GestureConfiguration::GetInstance() {
return GestureConfigurationAndroid::GetInstance();
}
} // namespace ui
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