1 files changed, 75 insertions, 0 deletions
diff --git a/src/input/input_touch_dpad.cpp b/src/input/input_touch_dpad.cpp
new file mode 100644
index 00000000..828d6b59
--- /dev/null
+++ b/src/input/input_touch_dpad.cpp
@@ -0,0 +1,75 @@
+/*
+ * Copyright 2024 jacqueline <me@jacqueline.id.au>
+ *
+ * SPDX-License-Identifier: GPL-3.0-only
+ */
+
+#include "input_touch_dpad.hpp"
+
+#include <cstdint>
+
+#include "hal/lv_hal_indev.h"
+
+#include "event_queue.hpp"
+#include "haptics.hpp"
+#include "input_device.hpp"
+#include "input_touch_dpad.hpp"
+#include "touchwheel.hpp"
+
+namespace input {
+
+static inline auto IsAngleWithin(int16_t wheel_angle,
+                                 int16_t target_angle,
+                                 int threshold) -> bool {
+  int16_t difference = (wheel_angle - target_angle + 127 + 255) % 255 - 127;
+  return difference <= threshold && difference >= -threshold;
+}
+
+TouchDPad::TouchDPad(drivers::TouchWheel& wheel) : wheel_(wheel) {}
+
+auto TouchDPad::read(lv_indev_data_t* data) -> void {
+  wheel_.Update();
+  auto wheel_data = wheel_.GetTouchWheelData();
+
+  if (wheel_data.is_button_touched) {
+    data->state = LV_INDEV_STATE_PRESSED;
+  } else {
+    data->state = LV_INDEV_STATE_RELEASED;
+  }
+
+  switch (up_.update(
+      wheel_data.is_wheel_touched &&
+      drivers::TouchWheel::isAngleWithin(wheel_data.wheel_position, 0, 32))) {
+    case Trigger::State::kNone:
+      break;
+    default:
+      data->enc_diff = -1;
+      break;
+  }
+  switch (right_.update(
+      wheel_data.is_wheel_touched &&
+      drivers::TouchWheel::isAngleWithin(wheel_data.wheel_position, 192, 32))) {
+    default:
+      break;
+  }
+  switch (down_.update(
+      wheel_data.is_wheel_touched &&
+      drivers::TouchWheel::isAngleWithin(wheel_data.wheel_position, 128, 32))) {
+    case Trigger::State::kNone:
+      break;
+    default:
+      data->enc_diff = 1;
+      break;
+  }
+  switch (left_.update(
+      wheel_data.is_wheel_touched &&
+      drivers::TouchWheel::isAngleWithin(wheel_data.wheel_position, 64, 32))) {
+    case Trigger::State::kLongPress:
+      events::Ui().Dispatch(ui::internal::BackPressed{});
+      break;
+    default:
+      break;
+  }
+}
+
+}  // namespace input