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/*
* Copyright 2024 jacqueline <me@jacqueline.id.au>
*
* SPDX-License-Identifier: GPL-3.0-only
*/
#include "input/input_touch_wheel.hpp"
#include <cstdint>
#include <variant>
#include "indev/lv_indev.h"
#include "drivers/haptics.hpp"
#include "drivers/nvs.hpp"
#include "drivers/touchwheel.hpp"
#include "events/event_queue.hpp"
#include "input/input_device.hpp"
#include "input/input_hook_actions.hpp"
#include "input/input_trigger.hpp"
#include "lua/property.hpp"
#include "ui/ui_events.hpp"
#include "esp_timer.h"
namespace input {
TouchWheel::TouchWheel(drivers::NvsStorage& nvs, drivers::TouchWheel& wheel)
: nvs_(nvs),
wheel_(wheel),
sensitivity_(static_cast<int>(nvs.ScrollSensitivity()),
[&](const lua::LuaValue& val) {
if (!std::holds_alternative<int>(val)) {
return false;
}
int int_val = std::get<int>(val);
if (int_val < 0 || int_val > UINT8_MAX) {
return false;
}
nvs.ScrollSensitivity(int_val);
threshold_ = calculateThreshold(int_val);
return true;
}),
centre_("centre", actions::select(), {}, {}, {}),
up_("up", {}, {}, actions::scrollToTop(), actions::scrollToTop()),
right_("right", {}),
down_("down",
{},
{},
actions::scrollToBottom(),
actions::scrollToBottom()),
left_("left", {}, {}, actions::goBack(), {}),
locked_(false),
is_scrolling_(false),
threshold_(calculateThreshold(nvs.ScrollSensitivity())),
is_first_read_(true),
last_angle_(0),
last_wheel_touch_time_(0) {}
auto TouchWheel::read(lv_indev_data_t* data, std::vector<InputEvent>& events) -> void {
if (locked_) {
return;
}
wheel_.Update();
auto wheel_data = wheel_.GetTouchWheelData();
int8_t ticks = calculateTicks(wheel_data);
if (!wheel_data.is_wheel_touched) {
// User has released the wheel.
is_scrolling_ = false;
data->enc_diff = 0;
} else if (ticks != 0) {
// User is touching the wheel, and has just passed the sensitivity
// threshold for a scroll tick.
is_scrolling_ = true;
data->enc_diff = ticks;
} else {
// User is touching the wheel, but hasn't moved.
data->enc_diff = 0;
}
// Prevent accidental center button touches while scrolling
if (wheel_data.is_wheel_touched) {
last_wheel_touch_time_ = esp_timer_get_time();
}
bool wheel_touch_timed_out =
esp_timer_get_time() - last_wheel_touch_time_ > SCROLL_TIMEOUT_US;
auto centre_state = centre_.update(wheel_touch_timed_out && wheel_data.is_button_touched &&
!wheel_data.is_wheel_touched,
data);
if (centre_state == input::Trigger::State::kPress) {
events.push_back(InputEvent::kOnPress);
} else if (centre_state == input::Trigger::State::kLongPress) {
events.push_back(InputEvent::kOnLongPress);
}
// If the user is touching the wheel but not scrolling, then they may be
// clicking on one of the wheel's cardinal directions.
if (is_scrolling_) {
up_.cancel();
right_.cancel();
down_.cancel();
left_.cancel();
} else {
bool pressing = wheel_data.is_wheel_touched;
up_.update(pressing && drivers::TouchWheel::isAngleWithin(
wheel_data.wheel_position, 0, 32),
data);
right_.update(pressing && drivers::TouchWheel::isAngleWithin(
wheel_data.wheel_position, 192, 32),
data);
down_.update(pressing && drivers::TouchWheel::isAngleWithin(
wheel_data.wheel_position, 128, 32),
data);
left_.update(pressing && drivers::TouchWheel::isAngleWithin(
wheel_data.wheel_position, 64, 32),
data);
}
}
auto TouchWheel::name() -> std::string {
return "wheel";
}
auto TouchWheel::triggers()
-> std::vector<std::reference_wrapper<TriggerHooks>> {
return {centre_, up_, right_, down_, left_};
}
auto TouchWheel::onLock() -> void {
wheel_.LowPowerMode(true);
locked_ = true;
}
auto TouchWheel::onUnlock() -> void {
wheel_.LowPowerMode(false);
wheel_.Recalibrate();
locked_ = false;
}
auto TouchWheel::sensitivity() -> lua::Property& {
return sensitivity_;
}
auto TouchWheel::calculateTicks(const drivers::TouchWheelData& data) -> int8_t {
if (!data.is_wheel_touched) {
is_first_read_ = true;
return 0;
}
uint8_t new_angle = data.wheel_position;
if (is_first_read_) {
is_first_read_ = false;
last_angle_ = new_angle;
return 0;
}
int delta = 128 - last_angle_;
uint8_t rotated_angle = new_angle + delta;
if (rotated_angle < 128 - threshold_) {
last_angle_ = new_angle;
return 1;
} else if (rotated_angle > 128 + threshold_) {
last_angle_ = new_angle;
return -1;
} else {
return 0;
}
}
auto TouchWheel::calculateThreshold(uint8_t sensitivity) -> uint8_t {
int tmax = 35;
int tmin = 5;
return (((255. - sensitivity) / 255.) * (tmax - tmin) + tmin);
}
} // namespace input
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