Struct NSResponder

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pub struct NSResponder { /* private fields */ }

Available on crate feature NSResponder only.

Expand description

Apple’s documentation

Implementations§

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impl NSResponder

NSInterfaceStyle.

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pub fn interfaceStyle(&self) -> NSInterfaceStyle

👎Deprecated

Available on crate feature NSInterfaceStyle only.

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pub fn setInterfaceStyle(&self, interface_style: NSInterfaceStyle)

👎Deprecated

Available on crate feature NSInterfaceStyle only.

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impl NSResponder

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pub fn init(this: Allocated<Self>) -> Retained<Self>

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pub unsafe fn initWithCoder( this: Allocated<Self>, coder: &NSCoder, ) -> Option<Retained<Self>>

§Safety

coder possibly has further requirements.

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pub unsafe fn nextResponder(&self) -> Option<Retained<NSResponder>>

§Safety

This is not retained internally, you must ensure the object is still alive.

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pub unsafe fn setNextResponder(&self, next_responder: Option<&NSResponder>)

Setter for nextResponder.

§Safety

This is unretained, you must ensure the object is kept alive while in use.

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pub unsafe fn tryToPerform_with( &self, action: Sel, object: Option<&AnyObject>, ) -> bool

§Safety

action must be a valid selector.
object should be of the correct type.

Handle a key event that should present a context menu at the user focus.

Most applications should not override this method. Instead, you should customize the context menu displayed from a keyboard event by implementing menuForEvent: and selectionAnchorRect, or showContextMenuForSelection:, rather than this method.

You should only override this method when you do not want the system-provided default behavior for the context menu hotkey, either for a specific key combination, or for the hotkey in general. For example, if your application already provides a different behavior for control-Return (the default context menu hotkey definition), and you want to preserve that behavior, you should override this method to handle that specific key combination, and then return without calling super. Note that the user may customize the hotkey to a different key combination, so in this example, if any other key combination is passed to your method, you would call super.

An implementation of this method should call [super contextMenuKeyDown:event] to pass the request up the responder chain. If the message reaches the application object, NSApplication’s implementation of this method will send showContextMenuForSelection: to the responder chain. If you do not call super, then no further handling of the key event will be performed.

Note: In some cases, showContextMenuForSelection: will be called without a prior call to contextMenuKeyDown:. This occurs when a view receives an Accessibility ShowMenu action, or when the user has created a Cocoa Text key binding to map a different key combination to the showContextMenuForSelection: action.

Parameter event: The key down event that matches the system-wide context menu hotkey combination.

See also: showContextMenuForSelection:

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pub unsafe fn noResponderFor(&self, event_selector: Sel)

§Safety

event_selector must be a valid selector.

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pub fn interpretKeyEvents(&self, event_array: &NSArray<NSEvent>)

Available on crate feature NSEvent only.

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Available on crate feature NSEvent only.

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pub fn shouldBeTreatedAsInkEvent(&self, event: &NSEvent) -> bool

Available on crate feature NSEvent only.

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pub fn wantsScrollEventsForSwipeTrackingOnAxis( &self, axis: NSEventGestureAxis, ) -> bool

Available on crate feature NSEvent only.

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pub fn wantsForwardedScrollEventsForAxis( &self, axis: NSEventGestureAxis, ) -> bool

Available on crate feature NSEvent only.

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pub unsafe fn supplementalTargetForAction_sender( &self, action: Sel, sender: Option<&AnyObject>, ) -> Option<Retained<AnyObject>>

§Safety

action must be a valid selector.
sender should be of the correct type.

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impl NSResponder

Methods declared on superclass NSObject.

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pub fn new(mtm: MainThreadMarker) -> Retained<Self>

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impl NSResponder

This impl block contains no items.

NSStandardKeyBindingMethods.

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impl NSResponder

NSUndoSupport.

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pub fn undoManager(&self) -> Option<Retained<NSUndoManager>>

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impl NSResponder

NSControlEditingSupport.

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pub fn validateProposedFirstResponder_forEvent( &self, responder: &NSResponder, event: Option<&NSEvent>, ) -> bool

Available on crate feature NSEvent only.

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impl NSResponder

NSErrorPresentation.

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pub unsafe fn presentError_modalForWindow_delegate_didPresentSelector_contextInfo( &self, error: &NSError, window: &NSWindow, delegate: Option<&AnyObject>, did_present_selector: Option<Sel>, context_info: *mut c_void, )

Available on crate feature NSWindow only.

§Safety

delegate should be of the correct type.
did_present_selector must be a valid selector.
context_info must be a valid pointer or null.

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pub fn presentError(&self, error: &NSError) -> bool

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Available on crate feature NSTouchBar only.

Setter for touchBar.

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pub fn makeTouchBar(&self) -> Option<Retained<NSTouchBar>>

Available on crate feature NSTouchBar only.

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impl NSResponder

NSUserActivity.

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pub fn userActivity(&self) -> Option<Retained<NSUserActivity>>

Available on crate feature NSUserActivity only.

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pub fn setUserActivity(&self, user_activity: Option<&NSUserActivity>)

Available on crate feature NSUserActivity only.

Setter for userActivity.

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pub fn updateUserActivityState(&self, user_activity: &NSUserActivity)

Available on crate feature NSUserActivity only.

Available on crate feature NSWindowRestoration only.

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pub fn restorableStateKeyPaths( mtm: MainThreadMarker, ) -> Retained<NSArray<NSString>>

Available on crate feature NSWindowRestoration only.

May panic if the object is invalid (which may be the case for objects returned from unavailable init/new methods).

§Example

Check that an instance of NSObject has the precise class NSObject.

use objc2::ClassType;
use objc2::runtime::NSObject;

let obj = NSObject::new();
assert_eq!(obj.class(), NSObject::class());

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pub unsafe fn get_ivar<T>(&self, name: &str) -> &T
where T: Encode,

👎Deprecated: this is difficult to use correctly, use Ivar::load instead.

Available on crate feature NSAccessibilityConstants only.

Use Ivar::load instead.

§Safety

The object must have an instance variable with the given name, and it must be of type T.

See Ivar::load_ptr for details surrounding this.

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pub fn downcast_ref<T>(&self) -> Option<&T>
where T: DowncastTarget,

Available on crate feature NSAccessibilityConstants only.

Attempt to downcast the object to a class of type T.

This is the reference-variant. Use Retained::downcast if you want to convert a retained object to another type.

§Mutable classes

Some classes have immutable and mutable variants, such as NSString and NSMutableString.

When some Objective-C API signature says it gives you an immutable class, it generally expects you to not mutate that, even though it may technically be mutable “under the hood”.

So using this method to convert a NSString to a NSMutableString, while not unsound, is generally frowned upon unless you created the string yourself, or the API explicitly documents the string to be mutable.

See Apple’s documentation on mutability and on isKindOfClass: for more details.

§Generic classes

Objective-C generics are called “lightweight generics”, and that’s because they aren’t exposed in the runtime. This makes it impossible to safely downcast to generic collections, so this is disallowed by this method.

You can, however, safely downcast to generic collections where all the type-parameters are AnyObject.

§Panics

This works internally by calling isKindOfClass:. That means that the object must have the instance method of that name, and an exception will be thrown (if CoreFoundation is linked) or the process will abort if that is not the case. In the vast majority of cases, you don’t need to worry about this, since both root objects NSObject and NSProxy implement this method.

§Examples

Cast an NSString back and forth from NSObject.

use objc2::rc::Retained;
use objc2_foundation::{NSObject, NSString};

let obj: Retained<NSObject> = NSString::new().into_super();
let string = obj.downcast_ref::<NSString>().unwrap();
// Or with `downcast`, if we do not need the object afterwards
let string = obj.downcast::<NSString>().unwrap();

Try (and fail) to cast an NSObject to an NSString.

use objc2_foundation::{NSObject, NSString};

let obj = NSObject::new();
assert!(obj.downcast_ref::<NSString>().is_none());

Try to cast to an array of strings.

use objc2_foundation::{NSArray, NSObject, NSString};

let arr = NSArray::from_retained_slice(&[NSObject::new()]);
// This is invalid and doesn't type check.
let arr = arr.downcast_ref::<NSArray<NSString>>();

This fails to compile, since it would require enumerating over the array to ensure that each element is of the desired type, which is a performance pitfall.

Downcast when processing each element instead.

use objc2_foundation::{NSArray, NSObject, NSString};

let arr = NSArray::from_retained_slice(&[NSObject::new()]);

for elem in arr {
    if let Some(data) = elem.downcast_ref::<NSString>() {
        // handle `data`
    }
}