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Show how to close a child viewport in the example

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This commit is contained in:
Emil Ernerfeldt
2023-11-15 17:49:42 +01:00
parent ccf96ceb93
commit 6f98994a7c
8 changed files with 72 additions and 36 deletions
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60
examples/multiple_viewports/src/main.rs
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@@ -1,5 +1,10 @@
#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")] // hide console window on Windows in release
use std::sync::{
atomic::{AtomicBool, Ordering},
Arc,
};
use eframe::egui;
fn main() -> Result<(), eframe::Error> {
@@ -9,7 +14,7 @@ fn main() -> Result<(), eframe::Error> {
..Default::default()
};
eframe::run_native(
"Confirm exit",
"Multiple viewports",
options,
Box::new(|_cc| Box::<MyApp>::default()),
)
@@ -17,7 +22,15 @@ fn main() -> Result<(), eframe::Error> {
#[derive(Default)]
struct MyApp {
show_child_viewport: bool,
/// Immediate viewports are show immediately, so passing state to/from them is easy.
/// The downside is that their painting is linked with the parent viewport:
/// if either needs repainting, they are both repainted.
show_immediate_viewport: bool,
/// Deferred viewports run independant of the parent viewport, which can save
/// CPU if only some of the viewports require repainting.
/// However, this requires passing state with `Arc` and locks.
show_deferred_viewport: Arc<AtomicBool>,
}
impl eframe::App for MyApp {
@@ -25,17 +38,48 @@ impl eframe::App for MyApp {
egui::CentralPanel::default().show(ctx, |ui| {
ui.label("Hello from the root viewport");
ui.checkbox(&mut self.show_child_viewport, "Show secondary viewport");
ui.checkbox(
&mut self.show_immediate_viewport,
"Show immediate child viewport",
);
let mut show_deferred_viewport = self.show_deferred_viewport.load(Ordering::Relaxed);
ui.checkbox(&mut show_deferred_viewport, "Show deferred child viewport");
self.show_deferred_viewport
.store(show_deferred_viewport, Ordering::Relaxed);
});
if self.show_child_viewport {
ctx.show_viewport(
egui::ViewportId::from_hash_of("secondary_viewport"),
egui::ViewportBuilder::CHILD.with_title("Secondary Viewport"),
if self.show_immediate_viewport {
ctx.show_viewport_immediate(
egui::ViewportId::from_hash_of("immediate_viewport"),
egui::ViewportBuilder::DEFAULTS.with_title("Immediate Viewport"),
|ctx| {
egui::CentralPanel::default().show(ctx, |ui| {
ui.label("Hello from secondary viewport");
ui.label("Hello from immediate viewport");
});
if ctx.input(|i| i.raw.viewport.close_requested) {
// Tell parent viewport that we should not show next frame:
self.show_immediate_viewport = false;
ctx.request_repaint(); // make sure there is a next frame
}
},
);
}
if self.show_deferred_viewport.load(Ordering::Relaxed) {
let show_deferred_viewport = self.show_deferred_viewport.clone();
ctx.show_viewport_immediate(
egui::ViewportId::from_hash_of("deferred_viewport"),
egui::ViewportBuilder::DEFAULTS.with_title("Deferred Viewport"),
|ctx| {
egui::CentralPanel::default().show(ctx, |ui| {
ui.label("Hello from deferred viewport");
});
if ctx.input(|i| i.raw.viewport.close_requested) {
// Tell parent to close use
show_deferred_viewport.store(false, Ordering::Relaxed);
ctx.request_repaint(); // make sure there is a next frame
}
},
);
}