134 lines
3.6 KiB
Rust
134 lines
3.6 KiB
Rust
//! This example shows that you can use egui in parallel from multiple threads.
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#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")] // hide console window on Windows in release
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use std::sync::mpsc;
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use std::thread::JoinHandle;
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use eframe::egui;
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fn main() -> Result<(), eframe::Error> {
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env_logger::init(); // Log to stderr (if you run with `RUST_LOG=debug`).
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let options = eframe::NativeOptions {
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initial_window_size: Some(egui::vec2(1024.0, 768.0)),
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..Default::default()
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};
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eframe::run_native(
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"My parallel egui App",
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options,
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Box::new(|_cc| Box::new(MyApp::new())),
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)
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}
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/// State per thread.
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struct ThreadState {
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thread_nr: usize,
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title: String,
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name: String,
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age: u32,
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}
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impl ThreadState {
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fn new(thread_nr: usize) -> Self {
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let title = format!("Background thread {thread_nr}");
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Self {
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thread_nr,
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title,
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name: "Arthur".into(),
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age: 12 + thread_nr as u32 * 10,
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}
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}
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fn show(&mut self, ctx: &egui::Context) {
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let pos = egui::pos2(16.0, 128.0 * (self.thread_nr as f32 + 1.0));
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egui::Window::new(&self.title)
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.default_pos(pos)
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.show(ctx, |ui| {
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ui.horizontal(|ui| {
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ui.label("Your name: ");
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ui.text_edit_singleline(&mut self.name);
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});
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ui.add(egui::Slider::new(&mut self.age, 0..=120).text("age"));
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if ui.button("Click each year").clicked() {
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self.age += 1;
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}
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ui.label(format!("Hello '{}', age {}", self.name, self.age));
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});
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}
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}
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fn new_worker(
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thread_nr: usize,
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on_done_tx: mpsc::SyncSender<()>,
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) -> (JoinHandle<()>, mpsc::SyncSender<egui::Context>) {
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let (show_tx, show_rc) = mpsc::sync_channel(0);
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let handle = std::thread::Builder::new()
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.name(format!("EguiPanelWorker {thread_nr}"))
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.spawn(move || {
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let mut state = ThreadState::new(thread_nr);
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while let Ok(ctx) = show_rc.recv() {
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state.show(&ctx);
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let _ = on_done_tx.send(());
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}
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})
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.expect("failed to spawn thread");
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(handle, show_tx)
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}
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struct MyApp {
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threads: Vec<(JoinHandle<()>, mpsc::SyncSender<egui::Context>)>,
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on_done_tx: mpsc::SyncSender<()>,
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on_done_rc: mpsc::Receiver<()>,
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}
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impl MyApp {
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fn new() -> Self {
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let threads = Vec::with_capacity(3);
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let (on_done_tx, on_done_rc) = mpsc::sync_channel(0);
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let mut slf = Self {
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threads,
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on_done_tx,
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on_done_rc,
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};
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slf.spawn_thread();
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slf.spawn_thread();
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slf
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}
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fn spawn_thread(&mut self) {
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let thread_nr = self.threads.len();
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self.threads
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.push(new_worker(thread_nr, self.on_done_tx.clone()));
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}
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}
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impl std::ops::Drop for MyApp {
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fn drop(&mut self) {
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for (handle, show_tx) in self.threads.drain(..) {
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std::mem::drop(show_tx);
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handle.join().unwrap();
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}
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}
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}
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impl eframe::App for MyApp {
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fn update(&mut self, ctx: &egui::Context, _frame: &mut eframe::Frame) {
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egui::Window::new("Main thread").show(ctx, |ui| {
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if ui.button("Spawn another thread").clicked() {
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self.spawn_thread();
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}
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});
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for (_handle, show_tx) in &self.threads {
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let _ = show_tx.send(ctx.clone());
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}
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for _ in 0..self.threads.len() {
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let _ = self.on_done_rc.recv();
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}
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}
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}
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