Struct BERenderingProcess

#[repr(C)]
pub struct BERenderingProcess { /* private fields */ }

Available on crate feature BERenderingProcess only.

An object that represents a running GPU extension process.

The system guarantees that the extension process has launched by the time the initializer methods return. If the extension process exits, the system calls interruptionHandler. There can only be one extension process per host browser. The first time this type is initialized, a process will be launched. If a extension process is all ready running, the returned object will represent the already running process.

See also Apple’s documentation

Implementations

impl BERenderingProcess

Capability.

pub unsafe fn grantCapability_error( &self, capability: &BEProcessCapability, ) -> Result<Retained<ProtocolObject<dyn BEProcessCapabilityGrant>>, Retained<NSError>>

Available on crate feature BECapability only.

Grants the specified capability to the process.

This method grants the specified capability to the process or returns nil and an error if it can not be granted.

• Parameters:

• capability: The capability to be granted

• error: The error out param populated if the capability cannot be granted.

• Returns: an invalidatable grant object that represents the granted capability.

impl BERenderingProcess

CapabilityInvalidationHandler.

pub unsafe fn grantCapability_error_invalidationHandler( &self, capability: &BEProcessCapability, error: Option<&mut Option<Retained<NSError>>>, invalidation_handler: &DynBlock<dyn Fn()>, ) -> Option<Retained<ProtocolObject<dyn BEProcessCapabilityGrant>>>

Available on crate features BECapability and block2 only.

Grants the specified capability to the process with invalidation handler.

This method grants the specified capability to the process or returns nil and an error if it can not be granted.

• Parameters:

• capability: The capability to be granted

• error: The error out param populated if the capability cannot be granted.

• invalidationHandler: The invalidation handler

• Returns: an invalidatable grant object that represents the granted capability.

impl BERenderingProcess

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

pub unsafe fn new() -> Retained<Self>

pub unsafe fn renderingProcessWithInterruptionHandler_completion( interruption_handler: &DynBlock<dyn Fn()>, completion: &DynBlock<dyn Fn(*mut BERenderingProcess, *mut NSError)>, )

Available on crate feature block2 only.

Asynchronously finds an existing extension process or launches one.

This initializer finds an existing extension rendering process. If it’s unable to find an existing process, it launches a new extension process.

• Parameters:
• interruptionHandler : A block that is called if the extension process terminates.
• completion : A block called with a new BERenderingProcess when the extension process has launched or with an error.

pub unsafe fn renderingProcessWithBundleID_interruptionHandler_completion( bundle_id: &NSString, interruption_handler: &DynBlock<dyn Fn()>, completion: &DynBlock<dyn Fn(*mut BERenderingProcess, *mut NSError)>, )

Available on crate feature block2 only.

Asynchronously launches a rendering extension process.

This initializer launches a new rendering extension process with the provided bundle identifier.

• Parameters:
• bundleID : The bundle identifier of the rendering extension process to launch.
• interruptionHandler : A block that is called if the extension process terminates.
• completion : A block called with a new BERenderingProcess when the extension process has launched or with an error.

pub unsafe fn invalidate(&self)

Stops the extension process.

When you call this method, you tell the system your app no longer needs this extension process. If this is the last connection from the host process to the extension process, the system terminates the extension process.

pub unsafe fn createVisibilityPropagationInteraction( &self, mtm: MainThreadMarker, ) -> Retained<ProtocolObject<dyn UIInteraction>>

attach the created interaction to a view to express that the content of that view is directly related to the working of this process. therefore, if the view is considered visible by the system then this process must also be considered to be visible. do not attempt to set an interaction on multiple views as interactions track their views - instead create a new interaction for each view that you want to propogate visibility to this process.

Methods from Deref<Target = NSObject>

pub fn doesNotRecognizeSelector(&self, sel: Sel) -> !

Handle messages the object doesn’t recognize.

See Apple’s documentation for details.

Methods from Deref<Target = AnyObject>

pub fn class(&self) -> &'static AnyClass

Dynamically find the class of this object.

Panics

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());

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

where T: Encode,

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

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.

pub fn downcast_ref<T>(&self) -> Option<&T>

where T: DowncastTarget,

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`
    }
}

Trait Implementations

impl AsRef<AnyObject> for BERenderingProcess

fn as_ref(&self) -> &AnyObject

Converts this type into a shared reference of the (usually inferred) input type.

impl AsRef<BERenderingProcess> for BERenderingProcess

fn as_ref(&self) -> &Self

Converts this type into a shared reference of the (usually inferred) input type.

impl AsRef<NSObject> for BERenderingProcess

fn as_ref(&self) -> &NSObject

Converts this type into a shared reference of the (usually inferred) input type.

impl Borrow<AnyObject> for BERenderingProcess

fn borrow(&self) -> &AnyObject

Immutably borrows from an owned value.

impl Borrow<NSObject> for BERenderingProcess

fn borrow(&self) -> &NSObject

Immutably borrows from an owned value.

impl ClassType for BERenderingProcess

const NAME: &'static str = "BERenderingProcess"

The name of the Objective-C class that this type represents.

type Super = NSObject

The superclass of this class.

type ThreadKind = <<BERenderingProcess as ClassType>::Super as ClassType>::ThreadKind

Whether the type can be used from any thread, or from only the main thread.

fn class() -> &'static AnyClass

Get a reference to the Objective-C class that this type represents.

fn as_super(&self) -> &Self::Super

Get an immutable reference to the superclass.

impl Debug for BERenderingProcess

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Deref for BERenderingProcess

type Target = NSObject

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl Hash for BERenderingProcess

fn hash<H: Hasher>(&self, state: &mut H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl Message for BERenderingProcess

fn retain(&self) -> Retained<Self>

where Self: Sized,

Increment the reference count of the receiver.

impl NSObjectProtocol for BERenderingProcess

fn isEqual(&self, other: Option<&AnyObject>) -> bool

where Self: Sized + Message,

Check whether the object is equal to an arbitrary other object.

fn hash(&self) -> usize

where Self: Sized + Message,

An integer that can be used as a table address in a hash table structure.

fn isKindOfClass(&self, cls: &AnyClass) -> bool

where Self: Sized + Message,

Check if the object is an instance of the class, or one of its subclasses.

fn is_kind_of<T>(&self) -> bool

where T: ClassType, Self: Sized + Message,

👎Deprecated: use isKindOfClass directly, or cast your objects with AnyObject::downcast_ref

Check if the object is an instance of the class type, or one of its subclasses.

fn isMemberOfClass(&self, cls: &AnyClass) -> bool

where Self: Sized + Message,

Check if the object is an instance of a specific class, without checking subclasses.

fn respondsToSelector(&self, aSelector: Sel) -> bool

where Self: Sized + Message,

Check whether the object implements or inherits a method with the given selector.

fn conformsToProtocol(&self, aProtocol: &AnyProtocol) -> bool

where Self: Sized + Message,

Check whether the object conforms to a given protocol.

fn description(&self) -> Retained<NSObject>

where Self: Sized + Message,

A textual representation of the object.

fn debugDescription(&self) -> Retained<NSObject>

where Self: Sized + Message,

A textual representation of the object to use when debugging.

fn isProxy(&self) -> bool

where Self: Sized + Message,

Check whether the receiver is a subclass of the NSProxy root class instead of the usual NSObject.

fn retainCount(&self) -> usize

where Self: Sized + Message,

The reference count of the object.

impl PartialEq for BERenderingProcess

fn eq(&self, other: &Self) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl RefEncode for BERenderingProcess

const ENCODING_REF: Encoding = <NSObject as ::objc2::RefEncode>::ENCODING_REF

The Objective-C type-encoding for a reference of this type.

impl DowncastTarget for BERenderingProcess

impl Eq for BERenderingProcess