How can I run in the background?

[pashifika]

I used tray-icon for the taskbar icon,
but the program can't receive the taskbar event after closing the display of the main window using ctx.send_viewport_cmd(egui::ViewportCommand::Visible(false))

[lucasmerlin]

Maybe it's related to this? #5112

[pashifika]

It’s related, but not entirely related. The main issue now is that there's no way to bring it back after hiding the main window.

[lucasmerlin]

Does something like this work? Which OS are you using?

use eframe::NativeOptions;
use egui::{CentralPanel, ViewportCommand};

fn main() -> eframe::Result {
    eframe::run_simple_native("Hide and Show", NativeOptions::default(), |ctx, _frame| {
        CentralPanel::default().show(ctx, |ui| {
            if ui.button("Hide").clicked() {
                let ctx = ctx.clone();
                
                ctx.send_viewport_cmd(ViewportCommand::Visible(false));

                std::thread::spawn(move || {
                    std::thread::sleep(std::time::Duration::from_secs(2));
                    ctx.send_viewport_cmd(ViewportCommand::Visible(true));
                });
            }
        });
    })
}

[pashifika]

OS: Windows 11 64bit (22631.4169)
It can be hidden, but the window cannot be restored.

[wangxiaochuTHU]

OS: Windows 11 64bit (22631.4169) It can be hidden, but the window cannot be restored.

I feel it's possible to record the window parameters (size, position, etc.) mannally before hiding it, which would be useful when restoring it.

[rustbasic]

This is because when the window is ViewportCommand::Visible(false), the program loses focus, so update() is not called with request_repaint().
Someone needs to add egui functionality, but it will probably take some time.
It's slightly related to #5112.