migrations/egui
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Run no egui pass in the web backend when the tab is hidden

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Same as the native backends: tick `App::logic` via `Context::run_logic`
and leave all ui state alone.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>
This commit is contained in:
Emil Ernerfeldt
2026-08-04 17:24:45 +02:00
parent 3f3882612b
commit 49d69a19dd
1 changed files with 47 additions and 24 deletions
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71
crates/eframe/src/web/app_runner.rs
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@@ -280,12 +280,31 @@ impl AppRunner {
.and_then(|v| v.visible())
.unwrap_or(true);
let full_output = self.egui_ctx.run_ui(raw_input, |ui| {
self.app.logic(ui.ctx(), &mut self.frame);
if !is_visible {
// The tab is hidden, so we run no egui pass at all.
// That way all ui state is left untouched, and is still there
// when the tab is shown again.
if is_visible {
self.app.ui(ui, &mut self.frame);
}
// No pass will consume the input, so save it for the next one:
self.input.raw.append(raw_input);
let egui::LogicOutput {
platform_output,
viewport_commands,
} = self.egui_ctx.run_logic(|ctx| {
self.app.logic(ctx, &mut self.frame);
});
self.handle_viewport_commands(viewport_commands.into_values().flatten());
self.handle_platform_output(platform_output);
return;
}
// `App::logic` may not show any ui, so it is called outside of the pass:
self.app.logic(&self.egui_ctx, &mut self.frame);
let full_output = self.egui_ctx.run_ui(raw_input, |ui| {
self.app.ui(ui, &mut self.frame);
});
let egui::FullOutput {
platform_output,
@@ -298,27 +317,31 @@ impl AppRunner {
if viewport_output.len() > 1 {
log::warn!("Multiple viewports not yet supported on the web");
}
for (_viewport_id, viewport_output) in viewport_output {
for command in viewport_output.commands {
match command {
ViewportCommand::Screenshot(user_data) => {
self.screenshot_commands_with_frame_delay
.push((user_data, 1));
}
_ => {
// TODO(emilk): handle some of the commands
log::warn!(
"Unhandled egui viewport command: {command:?} - not implemented in web backend"
);
}
}
}
}
self.handle_viewport_commands(
viewport_output
.into_values()
.flat_map(|viewport_output| viewport_output.commands),
);
self.handle_platform_output(platform_output);
if is_visible || !textures_delta.is_empty() {
self.textures_delta.append(textures_delta);
self.clipped_primitives = Some(self.egui_ctx.tessellate(shapes, pixels_per_point));
self.textures_delta.append(textures_delta);
self.clipped_primitives = Some(self.egui_ctx.tessellate(shapes, pixels_per_point));
}
fn handle_viewport_commands(&mut self, commands: impl Iterator<Item = ViewportCommand>) {
for command in commands {
match command {
ViewportCommand::Screenshot(user_data) => {
self.screenshot_commands_with_frame_delay
.push((user_data, 1));
}
_ => {
// TODO(emilk): handle some of the commands
log::warn!(
"Unhandled egui viewport command: {command:?} - not implemented in web backend"
);
}
}
}
}