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Viewports: give the caller a Ui instead of Context (#7779)

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* Part of https://github.com/emilk/egui/issues/3524

This is a breaking change, as it changes the how embedded viewports
work.
Before it was up to the user to display a `egui::Window` if they wanted.
Now egui creates an `egui::Window` for you, so you only need to add the
contents.

To signal this change in behavior, `ViewportClass::Embedded` is gone and
is now called `ViewportClass::EmbeddedWindow`.
This commit is contained in:
Emil Ernerfeldt
2025-12-15 18:51:57 +01:00
committed by GitHub
parent 4a81ca8dcf
commit 9487dc35ec
7 changed files with 144 additions and 80 deletions
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67
examples/multiple_viewports/src/main.rs
View File

@@ -44,10 +44,20 @@ impl eframe::App for MyApp {
"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);
{
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);
}
ui.add_space(16.0);
{
let mut embedded = ui.embed_viewports();
ui.checkbox(&mut embedded, "Embed all viewports");
ui.set_embed_viewports(embedded);
}
});
if self.show_immediate_viewport {
@@ -56,19 +66,20 @@ impl eframe::App for MyApp {
egui::ViewportBuilder::default()
.with_title("Immediate Viewport")
.with_inner_size([200.0, 100.0]),
|ctx, class| {
assert!(
class == egui::ViewportClass::Immediate,
"This egui backend doesn't support multiple viewports"
);
|ui, class| {
if class == egui::ViewportClass::EmbeddedWindow {
ui.label(
"This viewport is embedded in the parent window, and cannot be moved outside of it.",
);
} else {
egui::CentralPanel::default().show_inside(ui, |ui| {
ui.label("Hello from immediate viewport");
egui::CentralPanel::default().show(ctx, |ui| {
ui.label("Hello from immediate viewport");
});
if ctx.input(|i| i.viewport().close_requested()) {
// Tell parent viewport that we should not show next frame:
self.show_immediate_viewport = false;
if ui.input(|i| i.viewport().close_requested()) {
// Tell parent viewport that we should not show next frame:
self.show_immediate_viewport = false;
}
});
}
},
);
@@ -81,18 +92,20 @@ impl eframe::App for MyApp {
egui::ViewportBuilder::default()
.with_title("Deferred Viewport")
.with_inner_size([200.0, 100.0]),
move |ctx, class| {
assert!(
class == egui::ViewportClass::Deferred,
"This egui backend doesn't support multiple viewports"
);
move |ui, class| {
if class == egui::ViewportClass::EmbeddedWindow {
ui.label(
"This viewport is embedded in the parent window, and cannot be moved outside of it.",
);
} else {
egui::CentralPanel::default().show_inside(ui, |ui| {
ui.label("Hello from deferred viewport");
egui::CentralPanel::default().show(ctx, |ui| {
ui.label("Hello from deferred viewport");
});
if ctx.input(|i| i.viewport().close_requested()) {
// Tell parent to close us.
show_deferred_viewport.store(false, Ordering::Relaxed);
if ui.input(|i| i.viewport().close_requested()) {
// Tell parent to close us.
show_deferred_viewport.store(false, Ordering::Relaxed);
}
});
}
},
);