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The closure passed to `eframe::run_native` now returns a `Result`, allowing you to return an error during app creation, which will be returned to the caller of `run_native`. This means you need to wrap your `Box::new(MyApp::new(…))` in an `Ok(…)`. * Closes https://github.com/emilk/egui/issues/4474
73 lines
2.2 KiB
Rust
73 lines
2.2 KiB
Rust
#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")] // hide console window on Windows in release
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#![allow(rustdoc::missing_crate_level_docs)] // it's an example
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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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if cfg!(target_os = "macos") {
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eprintln!(
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"This example does not work on Mac! See https://github.com/emilk/egui/issues/1918"
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);
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return Ok(());
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}
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let options = eframe::NativeOptions {
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run_and_return: true,
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viewport: egui::ViewportBuilder::default().with_inner_size([320.0, 240.0]),
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..Default::default()
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};
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eprintln!("Starting first window…");
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eframe::run_native(
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"First Window",
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options.clone(),
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Box::new(|_cc| Ok(Box::new(MyApp { has_next: true }))),
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)?;
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std::thread::sleep(std::time::Duration::from_secs(2));
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eprintln!("Starting second window…");
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eframe::run_native(
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"Second Window",
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options.clone(),
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Box::new(|_cc| Ok(Box::new(MyApp { has_next: true }))),
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)?;
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std::thread::sleep(std::time::Duration::from_secs(2));
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eprintln!("Starting third window…");
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eframe::run_native(
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"Third Window",
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options,
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Box::new(|_cc| Ok(Box::new(MyApp { has_next: false }))),
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)
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}
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struct MyApp {
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pub(crate) has_next: bool,
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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::CentralPanel::default().show(ctx, |ui| {
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let label_text = if self.has_next {
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"When this window is closed the next will be opened after a short delay"
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} else {
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"This is the last window. Program will end when closed"
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};
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ui.label(label_text);
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if ctx.os() == egui::os::OperatingSystem::Mac {
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ui.label("This example doesn't work on Mac!");
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}
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if ui.button("Close").clicked() {
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eprintln!("Pressed Close button");
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ui.ctx().send_viewport_cmd(egui::ViewportCommand::Close);
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}
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});
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}
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}
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