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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/command_line.h"
#include "base/memory/singleton.h"
#include "base/strings/string_number_conversions.h"
#include "ui/events/event_switches.h"
namespace ui {
namespace {
#if BUILDFLAG(IS_CHROMEOS)
constexpr bool kDoubleTapAuraSupport = true;
#else
constexpr bool kDoubleTapAuraSupport = false;
#endif // BUILDFLAG(IS_CHROMEOS)
class GestureConfigurationAura : public GestureConfiguration {
public:
GestureConfigurationAura(const GestureConfigurationAura&) = delete;
GestureConfigurationAura& operator=(const GestureConfigurationAura&) = delete;
~GestureConfigurationAura() override {
}
static GestureConfigurationAura* GetInstance() {
return base::Singleton<GestureConfigurationAura>::get();
}
private:
GestureConfigurationAura() : GestureConfiguration() {
#if BUILDFLAG(IS_CHROMEOS)
// On ChromeOS, the touch slop value of 6 is derived from the android's
// default(8), multiplied by base dpi ratio(0.75). See crbug.com/1083120
// for more details.
set_max_touch_move_in_pixels_for_click(6);
// The default stylus slop value of 10 is derived from the UMA data analysis
// for making stylus clicks easier for users. See crbug.com/1181872.
set_max_stylus_move_in_pixels_for_click(10);
#endif
double touch_slop_distance;
base::CommandLine* command_line = base::CommandLine::ForCurrentProcess();
if (command_line->HasSwitch(switches::kTouchSlopDistance) &&
base::StringToDouble(
command_line->GetSwitchValueASCII(switches::kTouchSlopDistance),
&touch_slop_distance)) {
set_max_touch_move_in_pixels_for_click(touch_slop_distance);
}
set_double_tap_enabled(kDoubleTapAuraSupport);
set_double_tap_timeout_in_ms(double_tap_timeout_in_ms());
set_gesture_begin_end_types_enabled(true);
set_min_gesture_bounds_length(default_radius());
set_min_pinch_update_span_delta(
base::CommandLine::ForCurrentProcess()->HasSwitch(
switches::kCompensateForUnstablePinchZoom)
? 5
: 0);
set_velocity_tracker_strategy(VelocityTracker::Strategy::LSQ2_RESTRICTED);
set_span_slop(max_touch_move_in_pixels_for_click() * 2);
set_swipe_enabled(true);
set_two_finger_tap_enabled(true);
set_fling_touchpad_tap_suppression_enabled(true);
set_fling_touchscreen_tap_suppression_enabled(true);
}
friend struct base::DefaultSingletonTraits<GestureConfigurationAura>;
};
} // namespace
// Create a GestureConfigurationAura singleton instance when using aura.
GestureConfiguration* GestureConfiguration::GetPlatformSpecificInstance() {
return GestureConfigurationAura::GetInstance();
}
} // namespace ui
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