lvgl-rs/examples/demo.rs

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4.3 KiB
Rust
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use cstr_core::{CStr, CString};
use embedded_graphics::pixelcolor::Rgb565;
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use embedded_graphics::prelude::*;
use embedded_graphics_simulator::{
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OutputSettingsBuilder, SimulatorDisplay, SimulatorEvent, Window,
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};
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use lvgl;
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use lvgl::style::Style;
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use lvgl::widgets::{Label, LabelAlign};
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use lvgl::{Align, Color, LvError, Part, State, Widget, UI};
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use lvgl_sys;
use std::sync::{mpsc, Arc, Mutex};
use std::thread::sleep;
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use std::time::{Duration, Instant};
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fn main() -> Result<(), LvError> {
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let display: SimulatorDisplay<Rgb565> = SimulatorDisplay::new(Size::new(
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lvgl_sys::LV_HOR_RES_MAX,
lvgl_sys::LV_VER_RES_MAX,
));
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let output_settings = OutputSettingsBuilder::new().scale(2).build();
let mut window = Window::new("PineTime", &output_settings);
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let mut ui = UI::init()?;
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// Implement and register your display:
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ui.disp_drv_register(display).unwrap();
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// Create screen and widgets
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let mut screen = ui.scr_act()?;
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let mut screen_style = Style::default();
screen_style.set_bg_color(State::DEFAULT, Color::from_rgb((0, 0, 0)));
screen_style.set_radius(State::DEFAULT, 0);
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screen.add_style(Part::Main, screen_style)?;
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let mut time = Label::new(&mut screen)?;
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let mut style_time = Style::default();
//style_time.set_text_font(font_noto_sans_numeric_28);
style_time.set_text_color(State::DEFAULT, Color::from_rgb((255, 255, 255)));
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time.add_style(Part::Main, style_time)?;
time.set_align(&mut screen, Align::Center, 0, 0)?;
time.set_text(CString::new("20:46").unwrap().as_c_str())?;
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time.set_width(240)?;
time.set_height(240)?;
let mut bt = Label::new(&mut screen)?;
bt.set_width(50)?;
bt.set_height(80)?;
bt.set_recolor(true)?;
bt.set_text(CString::new("#5794f2 \u{F293}#").unwrap().as_c_str())?;
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bt.set_label_align(LabelAlign::Left)?;
bt.set_align(&mut screen, Align::InTopLeft, 0, 0)?;
fn set_text<S>(text: S) -> Result<(), ()>
where
S: AsRef<cstr_core::CStr>,
{
let _v: *const i8 = text.as_ref().as_ptr();
Ok(())
}
let mut t: heapless::String<heapless::consts::U8> = heapless::String::from("test");
t.push('\0').unwrap();
set_text(CStr::from_bytes_with_nul(t.as_bytes()).unwrap()).unwrap();
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set_text(cstr_core::CStr::from_bytes_with_nul("test\0".as_bytes()).unwrap()).unwrap();
set_text(cstr_core::CString::new("test").unwrap().as_c_str()).unwrap();
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let mut power = Label::new(&mut screen)?;
power.set_recolor(true)?;
power.set_width(80)?;
power.set_height(20)?;
power.set_text(CString::new("#fade2a 20%#").unwrap().as_c_str())?;
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power.set_label_align(LabelAlign::Right)?;
power.set_align(&mut screen, Align::InTopRight, 0, 0)?;
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let threaded_ui = Arc::new(Mutex::new(ui));
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let (stop_ch, read_ch) = mpsc::channel();
let closure_ui = threaded_ui.clone();
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let mut loop_started = Instant::now();
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let tick_thr = std::thread::spawn(move || loop {
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// Needs to be called periodically for LittlevGL internal timing calculations.
{
let mut ui = closure_ui.lock().unwrap();
ui.tick_inc(loop_started.elapsed());
}
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sleep(Duration::from_millis(5));
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if read_ch.try_recv().is_ok() {
break;
}
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loop_started = Instant::now();
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});
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let mut i = 0;
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'running: loop {
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if i > 59 {
i = 0;
}
let val = format!("21:{:02}", i);
time.set_text(CString::new(val.as_str()).unwrap().as_c_str())?;
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i = 1 + i;
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sleep(Duration::from_secs(1));
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threaded_ui.lock().unwrap().task_handler();
if let Some(disp) = threaded_ui.lock().unwrap().get_display_ref() {
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window.update(disp);
}
for event in window.events() {
match event {
SimulatorEvent::Quit => break 'running,
_ => {}
}
}
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}
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stop_ch.send(true).unwrap();
tick_thr.join().unwrap();
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Ok(())
}
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// Reference to native font for LittlevGL, defined in the file: "fonts_noto_sans_numeric_80.c"
// TODO: Create a macro for defining a safe wrapper for fonts.
// Maybe sometihng like:
//
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// font_declare! {
// NotoSansNumeric80 = noto_sans_numeric_80;
// };
//
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extern "C" {
pub static mut noto_sans_numeric_80: lvgl_sys::lv_font_t;
}