Struct wayland_client::Display

pub struct Display { /* fields omitted */ }

A connection to a wayland server

This object both represent the connection to the server, and as such must be kept alive as long as you are connected, and contains the primary WlDisplay wayland object, from which you can create all your need objects. The inner Proxy<WlDisplay> can be accessed via Deref.

Methods

impl Display

pub unsafe fn from_external_display(     display_ptr: *mut wl_display ) -> (Display, EventQueue)

Create a Display and Event Queue from an external display

This allows you to interface with an already-existing wayland connection, for example provided by a GUI toolkit.

To avoid interferences with the owner of the connection, wayland-client will create a new event queue and register a wrapper of the wl_display to this queue, then provide them to you. You can then use them as if they came from a direct wayland connection.

Note that if you need to retrieve the actual wl_display back (rather than its wrapper), you must use the get_display_ptr() method.

pub fn get_display_ptr(&self) -> *mut wl_display

Retrieve the wl_display pointer

If this Display was created from an external wl_display, its c_ptr() method will return a wrapper to the actual display. While this is perfectly good as a wl_proxy pointer, to send requests, this is not the actual wl_display and cannot be used as such.

This method will give you the wl_display.

pub fn connect_to_env() -> Result<(Display, EventQueue), ConnectError>

Attempt to connect to a wayland server using the contents of the environment variables

If the WAYLAND_DISPLAY variable is set, it will try to connect to the socket it points to. Otherwise, it will default to wayland-0.

On success, you are given the Display object as well as the main EventQueue hosting the WlDisplay wayland object.

This requires the XDG_RUNTIME_DIR variable to be properly set.

pub fn connect_to_name<S: Into<OsString>>(     name: S ) -> Result<(Display, EventQueue), ConnectError>

Attempt to connect to a wayland server socket with given name

On success, you are given the Display object as well as the main EventQueue hosting the WlDisplay wayland object.

This requires the XDG_RUNTIME_DIR variable to be properly set.

pub fn flush(&self) -> Result<i32>

Non-blocking write to the server

Outgoing messages to the server are buffered by the library for efficiency. This method flushes the internal buffer to the server socket.

Will write as many pending requests as possible to the server socket. Never blocks: if not all requests coul be written, will return an io error WouldBlock.

On success returns the number of written requests.

pub fn create_event_queue(&self) -> EventQueue

Create a new event queue associated with this wayland connection

Methods from Deref<Target = Proxy<WlDisplay>>

pub fn send(&self, msg: I::Request)

Send a request through this object

This is the generic method to send requests.

Several requests require the creation of new objects using the child() method, which if done wrong can cause protocol errors (in which case the server will terminate your connexion). Thus unless your know exactly what you are doing, you should use the helper methods provided by the various RequestsTrait for each interface, which handle this correctly for you.

pub fn is_alive(&self) -> bool

Check if the object associated with this proxy is still alive

Will return false if either:

• The object has been destroyed
• The object is not managed by this library (see the from_c_ptr method)

pub fn version(&self) -> u32

Retrieve the interface version of this wayland object instance

Returns 0 on dead objects

pub fn set_user_data(&self, ptr: *mut ())

Associate an arbitrary payload to this object

The pointer you associate here can be retrieved from any other proxy to the same wayland object.

Setting or getting user data is done as an atomic operation. You are responsible for the correct initialization of this pointer, synchronisation of access, and destruction of the contents at the appropriate time.

pub fn get_user_data(&self) -> *mut ()

Retrieve the arbitrary payload associated to this object

See set_user_data for explanations.

pub fn is_external(&self) -> bool

Check whether this proxy is managed by the library or not

See from_c_ptr for details.

pub fn equals(&self, other: &Proxy<I>) -> bool

Check if the other proxy refers to the same underlying wayland object

pub fn c_ptr(&self) -> *mut wl_proxy

Get a raw pointer to the underlying wayland object

Retrieve a pointer to the object from the libwayland-client.so library. You will mostly need it to interface with C libraries needing access to wayland objects (to initialize an opengl context for example).

pub fn make_wrapper(&self, queue: &QueueToken) -> Result<Proxy<I>, ()>

Create a wrapper for this object for queue management

As assigning a proxy to an event queue can be a racy operation in contextes involving multiple thread, this provides a facility to do this safely.

The wrapper object created behaves like a regular Proxy, except that all objects created as the result of its requests will be assigned to the queue associated to the provided token, rather than the queue of their parent. This does not change the queue of the proxy itself.

pub fn child<C: Interface>(&self) -> NewProxy<C>

Create a new child object

This creates a new wayland object, considered as a child of this object. It will notably inherit its interface version.

The created object should immediatly be implemented and sent in a request to the server, to keep the object list properly synchronized. Failure to do so will likely cause a protocol error.

pub fn is_implemented_with<Impl>(&self) -> bool where     Impl: Implementation<Proxy<I>, I::Event> + 'static,

Check whether this proxy has been implemented with given type

Always returns false if the proxy is no longer alive

Trait Implementations

impl Deref for Display

type Target = Proxy<WlDisplay>

The resulting type after dereferencing.

fn deref(&self) -> &Proxy<WlDisplay>

Dereferences the value.