Struct ObjectId 

pub struct ObjectId { /* private fields */ }

An ID representing a Wayland object

The backend internally tracks which IDs are still valid, invalidates them when the protocol object they represent is destroyed. As such even though the Wayland protocol reuses IDs, you can confidently compare two ObjectId for equality, they will only compare as equal if they both represent the same protocol object.

Implementations

impl ObjectId

pub fn is_null(&self) -> bool

Check if this is a null ID

Note: This is not the same as checking if the ID is still valid, which cannot be done without the Backend. A null ID is the ID equivalent of a null pointer: it never has been valid and never will be.

pub fn null() -> ObjectId

Create a null object ID

This object ID is always invalid, and should be used as placeholder in requests that create objects, or for request with an optional Object argument.

See Backend::send_request() for details.

pub fn interface(&self) -> &'static Interface

Interface of the represented object

pub fn protocol_id(&self) -> u32

Return the protocol-level numerical ID of this object

Protocol IDs are reused after object destruction, so this should not be used as a unique identifier, instead use the ObjectId directly, it implements Clone, PartialEq, Eq and Hash.

impl ObjectId

pub unsafe fn from_ptr( interface: &'static Interface, ptr: *mut wl_proxy, ) -> Result<Self, InvalidId>

Creates an object id from a libwayland-client pointer.

Errors

This function returns an InvalidId error if the interface of the proxy does not match the provided interface.

Safety

The provided pointer must be a valid pointer to a wl_resource and remain valid for as long as the retrieved ObjectId is used.

pub fn as_ptr(&self) -> Result<NonNull<wl_proxy>, InvalidId>

Get the underlying libwayland pointer for this object

Errors

This function returns an InvalidId error if proxy has already been destroyed.

pub fn display_ptr(&self) -> Result<NonNull<wl_display>, InvalidId>

Get the underlying display pointer for this object.

This pointer is associated with the original display this object belongs to.

Trait Implementations

impl Clone for ObjectId

fn clone(&self) -> ObjectId

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ObjectId

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

Formats the value using the given formatter.

impl Display for ObjectId

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

Formats the value using the given formatter.

impl Hash for ObjectId

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 PartialEq for ObjectId

fn eq(&self, other: &ObjectId) -> 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 Eq for ObjectId

impl StructuralPartialEq for ObjectId