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https://github.com/ByteWelder/Tactility.git
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bdb50505e7
USB Audio Class (UAC) output Audio codec re-binding Keyboard / Bluetooth HID HID Consumer Control (media keys) Symbol exports Other fixes IMU-based screen auto-rotate See PR for details: https://github.com/TactilityProject/Tactility/pull/655
74 lines
2.5 KiB
C++
74 lines
2.5 KiB
C++
#include "tab5_keyboard_lvgl_rotation.h"
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#include <tactility/device.h>
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#include <tactility/device_listener.h>
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#include <lvgl/lvgl.h>
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#include <lvgl.h>
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#include <atomic>
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static lv_display_rotation_t saved_rotation = LV_DISPLAY_ROTATION_0;
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static bool rotation_override_active = false;
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// device_listener_remove() doesn't wait for an in-flight on_device_event() callback to finish -
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// a DEVICE_EVENT_STARTED already snapshotted by device_listener_notify() can still fire after
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// stop() has run. This flag makes such a late callback a no-op instead of re-applying the
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// override after shutdown.
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static std::atomic<bool> listener_active { false };
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static void apply_rotation(bool attached) {
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lvgl_lock();
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if (attached && !listener_active.load(std::memory_order_acquire)) {
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lvgl_unlock();
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return;
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}
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auto* display = lv_display_get_default();
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if (display == nullptr) {
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lvgl_unlock();
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return;
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}
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if (attached) {
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if (lv_display_get_rotation(display) != LV_DISPLAY_ROTATION_90) {
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saved_rotation = lv_display_get_rotation(display);
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rotation_override_active = true;
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lv_display_set_rotation(display, LV_DISPLAY_ROTATION_90);
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}
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} else if (rotation_override_active) {
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// Ownership of the rotation ends here regardless - only restore it if the display is
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// still at what we set it to (the user may have changed it manually while attached).
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if (lv_display_get_rotation(display) == LV_DISPLAY_ROTATION_90) {
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lv_display_set_rotation(display, saved_rotation);
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}
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rotation_override_active = false;
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}
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lvgl_unlock();
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}
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static void on_device_event(Device* device, DeviceEvent event, void*) {
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if (!listener_active.load(std::memory_order_acquire) || !device_is_compatible(device, "m5stack,tab5-keyboard")) {
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return;
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}
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if (event == DEVICE_EVENT_STARTED) {
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apply_rotation(true);
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} else if (event == DEVICE_EVENT_STOPPED) {
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apply_rotation(false);
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}
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}
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void tab5_keyboard_lvgl_rotation_start() {
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rotation_override_active = false;
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listener_active.store(true, std::memory_order_release);
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device_listener_add(on_device_event, nullptr);
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}
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void tab5_keyboard_lvgl_rotation_stop() {
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// Set before apply_rotation()/device_listener_remove(): a late in-flight callback must no-op.
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listener_active.store(false, std::memory_order_release);
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apply_rotation(false);
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device_listener_remove(on_device_event, nullptr);
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}
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