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Context::request_repaint will wake up the UI thread (#1366)

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This adds a callback (set by `Context::set_request_repaint_callback`)
which integration can use to wake up the UI thread.

eframe (egui_web and egui_glow) will use this, replacing
`epi::Frame::request_repaint`.

Existing code calling `epi::Frame::request_repaint` should be changed
to instead call `egui::Context::request_repaint`.

This is the first callback added to the egui API, which otherwise is
completely driven by data.

The purpose of this is to remove the confusion between the two
`request_repaint` methods (by removing one). Furthermore, it makes
`epi::Frame` a lot simpler, allowing future simplifications to it
(perhaps no longer having it be `Send+Sync+Clone`).
This commit is contained in:
Emil Ernerfeldt
2022-03-15 17:21:52 +01:00
committed by GitHub
parent 6aee4997d4
commit c768d1d48e
12 changed files with 46 additions and 48 deletions
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3
egui_demo_lib/src/apps/http_app.rs
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@@ -78,11 +78,10 @@ impl epi::App for HttpApp {
if trigger_fetch {
let ctx = ctx.clone();
let frame = frame.clone();
let (sender, promise) = Promise::new();
let request = ehttp::Request::get(&self.url);
ehttp::fetch(request, move |response| {
frame.request_repaint(); // wake up UI thread
ctx.request_repaint(); // wake up UI thread
let resource = response.map(|response| Resource::from_response(&ctx, response));
sender.send(resource);
});