28 lines
886 B
Rust
28 lines
886 B
Rust
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use std::ptr::NonNull;
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use block2::RcBlock;
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use objc2::rc::Retained;
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use objc2_foundation::{NSNotification, NSNotificationCenter, NSNotificationName, NSObject};
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/// Observe the given notification.
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///
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/// This is used in Winit as an alternative to declaring an application delegate, as we want to
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/// give the user full control over those.
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pub fn create_observer(
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center: &NSNotificationCenter,
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name: &NSNotificationName,
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handler: impl Fn(&NSNotification) + 'static,
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) -> Retained<NSObject> {
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let block = RcBlock::new(move |notification: NonNull<NSNotification>| {
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handler(unsafe { notification.as_ref() });
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});
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unsafe {
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center.addObserverForName_object_queue_usingBlock(
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Some(name),
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None, // No sender filter
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None, // No queue, run on posting thread (i.e. main thread)
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&block,
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)
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}
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}
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