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Support returning errors when creating the app (#4565)

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The closure passed to `eframe::run_native` now returns a `Result`,
allowing you to return an error during app creation, which will be
returned to the caller of `run_native`.

This means you need to wrap your `Box::new(MyApp::new(…))` in an
`Ok(…)`.

* Closes https://github.com/emilk/egui/issues/4474
This commit is contained in:
Emil Ernerfeldt
2024-05-28 21:59:19 +02:00
committed by GitHub
parent 54429e0549
commit 942fe4ab31
28 changed files with 44 additions and 36 deletions
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4
crates/eframe/src/epi.rs
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@@ -41,10 +41,12 @@ pub type EventLoopBuilderHook = Box<dyn FnOnce(&mut EventLoopBuilder<UserEvent>)
#[cfg(any(feature = "glow", feature = "wgpu"))]
pub type WindowBuilderHook = Box<dyn FnOnce(egui::ViewportBuilder) -> egui::ViewportBuilder>;
type DynError = Box<dyn std::error::Error>;
/// This is how your app is created.
///
/// You can use the [`CreationContext`] to setup egui, restore state, setup OpenGL things, etc.
pub type AppCreator = Box<dyn FnOnce(&CreationContext<'_>) -> Box<dyn App>>;
pub type AppCreator = Box<dyn FnOnce(&CreationContext<'_>) -> Result<Box<dyn App>, DynError>>;
/// Data that is passed to [`AppCreator`] that can be used to setup and initialize your app.
pub struct CreationContext<'s> {