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create_viewport_sync: embed viewport if backend doesn't support them

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This commit is contained in:
Emil Ernerfeldt
2023-11-03 13:44:05 +01:00
parent 256ad734b4
commit 682db9cef6
1 changed files with 22 additions and 13 deletions
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35
crates/egui/src/context.rs
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@@ -2626,6 +2626,10 @@ impl Context {
/// The given ui function will be called immediately.
/// This can only be called from the main thread.
///
/// If [`force_embedding`] is true, or if the current egui
/// backend does not support sync viewports, the given callback
/// will be called immediately and the function will return.
///
/// When this is called the current viewport will be paused
/// This will render in a native window if is possible.
/// When this finishes then the last viewport will continue drawing
@@ -2643,8 +2647,16 @@ impl Context {
viewport_ui_cb: impl FnOnce(&Context) -> T,
) -> T {
if self.force_embedding() {
viewport_ui_cb(self)
} else {
return viewport_ui_cb(self);
}
EGUI_RENDER_SYNC.with(|render_sync_viewport_cb| {
let render_sync_viewport_cb = render_sync_viewport_cb.borrow();
let Some(render_sync_viewport_cb) = render_sync_viewport_cb.as_ref() else {
// This egui backend does not support multiple viewports.
return viewport_ui_cb(self);
};
let id_pair = self.write(|ctx| {
let parent = ctx.viewport_id();
@@ -2676,22 +2688,19 @@ impl Context {
let mut out = None;
{
let out = &mut out;
EGUI_RENDER_SYNC.with(|render_sync|{
let render_sync = render_sync.borrow();
let render_sync = render_sync.as_ref().expect("No EGUI_RENDER_SYNC callback on this thread, if you try to use Context::create_viewport_sync you cannot do that in other thread! If that is not the issue your egui intrecration is invalid or do not support sync viewports!");
render_sync(
self,
viewport_builder,
id_pair,
Box::new(move |context| *out = Some(viewport_ui_cb(context))),
);
});
render_sync_viewport_cb(
self,
viewport_builder,
id_pair,
Box::new(move |context| *out = Some(viewport_ui_cb(context))),
);
}
out.expect(
"egui backend is implemented incorrectly - the user calback was never called",
)
}
})
}
}