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Provide an error enum for the error case of slint::platform::set_platform

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cc #1502
This commit is contained in:
Simon Hausmann 2022-09-06 13:40:00 +02:00 • committed by Simon Hausmann
parent 594131a7ea
commit ea94089b05
1 changed files with 14 additions and 4 deletions
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18
internal/core/platform.rs
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@ -132,18 +132,28 @@ pub(crate) fn event_loop_proxy() -> Option<&'static dyn EventLoopProxy> {
EVENTLOOP_PROXY.get().map(core::ops::Deref::deref)
}
/// This enum describes the different error scenarios that may occur when [`set_platform`]
/// fails.
#[derive(Debug, Clone)]
#[repr(C)]
#[non_exhaustive]
pub enum SetPlatformError {
/// The platform has been initialized in an earlier call to [`set_platform`].
AlreadySet,
}
/// Set the slint platform abstraction.
///
/// If the platform abstraction was already set this will return `Err`
pub fn set_platform(platform: Box<dyn Platform + 'static>) -> Result<(), ()> {
pub fn set_platform(platform: Box<dyn Platform + 'static>) -> Result<(), SetPlatformError> {
PLATFORM_INSTANCE.with(|instance| {
if instance.get().is_some() {
return Err(());
return Err(SetPlatformError::AlreadySet);
}
if let Some(proxy) = platform.new_event_loop_proxy() {
EVENTLOOP_PROXY.set(proxy).map_err(drop)?
EVENTLOOP_PROXY.set(proxy).map_err(|_| SetPlatformError::AlreadySet)?
}
instance.set(platform.into()).map_err(drop).unwrap();
instance.set(platform.into()).map_err(|_| SetPlatformError::AlreadySet).unwrap();
Ok(())
})
}