69 lines
2 KiB
Rust
69 lines
2 KiB
Rust
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//! Everything useful for the `WindowDelegate`. Handles injecting an `NSWindowDelegate` subclass
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//! into the Objective C runtime, which loops back to give us lifecycle methods.
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use std::rc::Rc;
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use std::sync::Once;
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use objc::declare::ClassDecl;
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use objc::runtime::{Class, Object, Sel};
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use objc::{class, sel, sel_impl};
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use crate::foundation::id;
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use crate::utils::load;
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use crate::window::{WindowDelegate, WINDOW_DELEGATE_PTR};
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/// Called when an `NSWindow` receives a `windowWillClose:` event.
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/// Good place to clean up memory and what not.
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extern fn will_close<T: WindowDelegate>(this: &Object, _: Sel, _: id) {
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let window = load::<T>(this, WINDOW_DELEGATE_PTR);
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{
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let window = window.borrow();
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(*window).will_close();
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}
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Rc::into_raw(window);
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}
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/// Injects an `NSWindow` subclass, with some callback and pointer ivars for what we
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/// need to do.
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pub(crate) fn register_window_class() -> *const Class {
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static mut DELEGATE_CLASS: *const Class = 0 as *const Class;
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static INIT: Once = Once::new();
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INIT.call_once(|| unsafe {
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let superclass = class!(NSWindow);
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let decl = ClassDecl::new("RSTWindow", superclass).unwrap();
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DELEGATE_CLASS = decl.register();
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});
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unsafe {
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DELEGATE_CLASS
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}
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}
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/// Injects an `NSWindowDelegate` subclass, with some callback and pointer ivars for what we
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/// need to do.
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pub(crate) fn register_window_class_with_delegate<T: WindowDelegate>() -> *const Class {
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static mut DELEGATE_CLASS: *const Class = 0 as *const Class;
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static INIT: Once = Once::new();
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INIT.call_once(|| unsafe {
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let superclass = class!(NSWindow);
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let mut decl = ClassDecl::new("RSTWindowWithDelegate", superclass).unwrap();
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decl.add_ivar::<usize>(WINDOW_DELEGATE_PTR);
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// Subclassed methods
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// NSWindowDelegate methods
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decl.add_method(sel!(windowWillClose:), will_close::<T> as extern fn(&Object, _, _));
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DELEGATE_CLASS = decl.register();
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});
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unsafe {
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DELEGATE_CLASS
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}
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}
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