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Make the first example that users see a bit more interesting, and move a bit of documentation from the README into the objc2 crate's topics.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,132 @@ | ||
| #![deny(unsafe_op_in_unsafe_fn)] | ||
| use std::cell::OnceCell; | ||
|
|
||
| use objc2::rc::Retained; | ||
| use objc2::runtime::ProtocolObject; | ||
| use objc2::{define_class, msg_send, DefinedClass, MainThreadOnly}; | ||
| use objc2_app_kit::{ | ||
| NSApplication, NSApplicationActivationPolicy, NSApplicationDelegate, NSAutoresizingMaskOptions, | ||
| NSBackingStoreType, NSColor, NSFont, NSTextAlignment, NSTextField, NSWindow, NSWindowDelegate, | ||
| NSWindowStyleMask, | ||
| }; | ||
| use objc2_foundation::{ | ||
| ns_string, MainThreadMarker, NSNotification, NSObject, NSObjectProtocol, NSPoint, NSRect, | ||
| NSSize, | ||
| }; | ||
|
|
||
| #[derive(Debug, Default)] | ||
| struct AppDelegateIvars { | ||
| window: OnceCell<Retained<NSWindow>>, | ||
| } | ||
|
|
||
| define_class!( | ||
| // SAFETY: | ||
| // - The superclass NSObject does not have any subclassing requirements. | ||
| // - `Delegate` does not implement `Drop`. | ||
| #[unsafe(super = NSObject)] | ||
| #[thread_kind = MainThreadOnly] | ||
| #[name = "Delegate"] | ||
| #[ivars = AppDelegateIvars] | ||
| struct Delegate; | ||
|
|
||
| // SAFETY: `NSObjectProtocol` has no safety requirements. | ||
| unsafe impl NSObjectProtocol for Delegate {} | ||
|
|
||
| // SAFETY: `NSApplicationDelegate` has no safety requirements. | ||
| unsafe impl NSApplicationDelegate for Delegate { | ||
| // SAFETY: The signature is correct. | ||
| #[unsafe(method(applicationDidFinishLaunching:))] | ||
| fn did_finish_launching(&self, notification: &NSNotification) { | ||
| let mtm = self.mtm(); | ||
|
|
||
| let app = unsafe { notification.object() } | ||
| .unwrap() | ||
| .downcast::<NSApplication>() | ||
| .unwrap(); | ||
|
|
||
| let text_field = unsafe { | ||
| let text_field = NSTextField::labelWithString(ns_string!("Hello, World!"), mtm); | ||
| text_field.setFrame(NSRect::new( | ||
| NSPoint::new(5.0, 100.0), | ||
| NSSize::new(290.0, 100.0), | ||
| )); | ||
| text_field.setTextColor(Some(&NSColor::colorWithSRGBRed_green_blue_alpha( | ||
| 0.0, 0.5, 0.0, 1.0, | ||
| ))); | ||
| text_field.setAlignment(NSTextAlignment::Center); | ||
| text_field.setFont(Some(&NSFont::systemFontOfSize(45.0))); | ||
| text_field.setAutoresizingMask( | ||
| NSAutoresizingMaskOptions::ViewWidthSizable | ||
| | NSAutoresizingMaskOptions::ViewHeightSizable, | ||
| ); | ||
| text_field | ||
| }; | ||
|
|
||
| // SAFETY: We disable releasing when closed below. | ||
| let window = unsafe { | ||
| NSWindow::initWithContentRect_styleMask_backing_defer( | ||
| NSWindow::alloc(mtm), | ||
| NSRect::new(NSPoint::new(0.0, 0.0), NSSize::new(300.0, 300.0)), | ||
| NSWindowStyleMask::Titled | ||
| | NSWindowStyleMask::Closable | ||
| | NSWindowStyleMask::Miniaturizable | ||
| | NSWindowStyleMask::Resizable, | ||
| NSBackingStoreType::Buffered, | ||
| false, | ||
| ) | ||
| }; | ||
| // SAFETY: Disable auto-release when closing windows. | ||
| // This is required when creating `NSWindow` outside a window | ||
| // controller. | ||
| unsafe { window.setReleasedWhenClosed(false) }; | ||
|
|
||
| // Set various window properties. | ||
| window.setTitle(ns_string!("A window")); | ||
| let view = window.contentView().expect("window must have content view"); | ||
| unsafe { view.addSubview(&text_field) }; | ||
| window.center(); | ||
| unsafe { window.setContentMinSize(NSSize::new(300.0, 300.0)) }; | ||
| window.setDelegate(Some(ProtocolObject::from_ref(self))); | ||
|
|
||
| // Show the window. | ||
| window.makeKeyAndOrderFront(None); | ||
|
|
||
| // Store the window in the delegate. | ||
| self.ivars().window.set(window).unwrap(); | ||
|
|
||
| app.setActivationPolicy(NSApplicationActivationPolicy::Regular); | ||
|
|
||
| // Activate the application. | ||
| // Required when launching unbundled (as is done with Cargo). | ||
| #[allow(deprecated)] | ||
| app.activateIgnoringOtherApps(true); | ||
| } | ||
| } | ||
|
|
||
| // SAFETY: `NSWindowDelegate` has no safety requirements. | ||
| unsafe impl NSWindowDelegate for Delegate { | ||
| #[unsafe(method(windowWillClose:))] | ||
| fn window_will_close(&self, _notification: &NSNotification) { | ||
| // Quit the application when the window is closed. | ||
| unsafe { NSApplication::sharedApplication(self.mtm()).terminate(None) }; | ||
| } | ||
| } | ||
| ); | ||
|
|
||
| impl Delegate { | ||
| fn new(mtm: MainThreadMarker) -> Retained<Self> { | ||
| let this = Self::alloc(mtm).set_ivars(AppDelegateIvars::default()); | ||
| // SAFETY: The signature of `NSObject`'s `init` method is correct. | ||
| unsafe { msg_send![super(this), init] } | ||
| } | ||
| } | ||
|
|
||
| fn main() { | ||
| let mtm = MainThreadMarker::new().unwrap(); | ||
|
|
||
| let app = NSApplication::sharedApplication(mtm); | ||
| let delegate = Delegate::new(mtm); | ||
| app.setDelegate(Some(ProtocolObject::from_ref(&*delegate))); | ||
|
|
||
| app.run(); | ||
| } |
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