72 lines
2 KiB
Rust
72 lines
2 KiB
Rust
use crate::{DisplayDriver, Event, LvError, LvResult, Obj, Widget};
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use alloc::boxed::Box;
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use core::marker::PhantomData;
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use core::ptr;
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use core::ptr::NonNull;
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use core::sync::atomic::{AtomicBool, Ordering};
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use core::time::Duration;
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// There can only be a single reference to LittlevGL library.
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static LVGL_IN_USE: AtomicBool = AtomicBool::new(false);
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pub struct UI {
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// LittlevGL is not thread-safe by default.
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_not_sync: PhantomData<*mut ()>,
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}
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// LittlevGL does not use thread locals.
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unsafe impl Send for UI {}
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impl UI {
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pub fn init() -> LvResult<Self> {
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if !LVGL_IN_USE.compare_and_swap(false, true, Ordering::SeqCst) {
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unsafe {
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lvgl_sys::lv_init();
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}
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Ok(Self {
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_not_sync: PhantomData,
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})
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} else {
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Err(LvError::AlreadyInUse)
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}
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}
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pub fn disp_drv_register(&mut self, display: DisplayDriver) {
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// Throw display driver into a box and add to user data (if we need to get the display back)
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// or simply forget the display pointer/object to prevent Drop to be called
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// register it
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unsafe {
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let boxed = Box::new(display.raw);
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lvgl_sys::lv_disp_drv_register(Box::into_raw(boxed));
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}
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}
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pub fn scr_act(&self) -> LvResult<Obj> {
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unsafe {
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let screen = lvgl_sys::lv_disp_get_scr_act(ptr::null_mut());
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Ok(Obj::from_raw(NonNull::new(screen)?))
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}
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}
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pub fn event_send<T>(&mut self, obj: &mut T, event: Event<T::SpecialEvent>) -> LvResult<()>
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where
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T: Widget,
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{
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unsafe {
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lvgl_sys::lv_event_send(obj.raw()?.as_mut(), event.into(), ptr::null_mut());
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}
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Ok(())
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}
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pub fn tick_inc(&mut self, tick_period: Duration) {
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unsafe {
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lvgl_sys::lv_tick_inc(tick_period.as_millis() as u32);
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}
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}
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pub fn task_handler(&mut self) {
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unsafe {
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lvgl_sys::lv_task_handler();
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}
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}
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}
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