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<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="API documentation for the Rust `wayland_client` crate."><meta name="keywords" content="rust, rustlang, rust-lang, wayland_client"><title>wayland_client - Rust</title><link rel="stylesheet" type="text/css" href="../normalize.css"><link rel="stylesheet" type="text/css" href="../rustdoc.css" id="mainThemeStyle"><link rel="stylesheet" type="text/css" href="../dark.css"><link rel="stylesheet" type="text/css" href="../light.css" id="themeStyle"><script src="../storage.js"></script><noscript><link rel="stylesheet" href="../noscript.css"></noscript><link rel="shortcut icon" href="../favicon.ico"><style type="text/css">#crate-search{background-image:url("../down-arrow.svg");}</style></head><body class="rustdoc mod"><!--[if lte IE 8]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="sidebar-menu">☰</div><a href='../wayland_client/index.html'><div class='logo-container'><img src='../rust-logo.png' alt='logo'></div></a><p class='location'>Crate wayland_client</p><div class="sidebar-elems"><a id='all-types' href='all.html'><p>See all wayland_client's items</p></a><div class="block items"><ul><li><a href="#modules">Modules</a></li><li><a href="#macros">Macros</a></li><li><a href="#structs">Structs</a></li><li><a href="#enums">Enums</a></li><li><a href="#traits">Traits</a></li></ul></div><p class='location'></p><script>window.sidebarCurrent = {name: 'wayland_client', ty: 'mod', relpath: '../'};</script></div></nav><div class="theme-picker"><button id="theme-picker" aria-label="Pick another theme!"><img src="../brush.svg" width="18" alt="Pick another theme!"></button><div id="theme-choices"></div></div><script src="../theme.js"></script><nav class="sub"><form class="search-form js-only"><div class="search-container"><div><select id="crate-search"><option value="All crates">All crates</option></select><input class="search-input" name="search" autocomplete="off" spellcheck="false" placeholder="Click or press ‘S’ to search, ‘?’ for more options…" type="search"></div><a id="settings-menu" href="../settings.html"><img src="../wheel.svg" width="18" alt="Change settings"></a></div></form></nav><section id="main" class="content"><h1 class='fqn'><span class='out-of-band'><span id='render-detail'><a id="toggle-all-docs" href="javascript:void(0)" title="collapse all docs">[<span class='inner'>−</span>]</a></span><a class='srclink' href='../src/wayland_client/lib.rs.html#1-282' title='goto source code'>[src]</a></span><span class='in-band'>Crate <a class="mod" href=''>wayland_client</a></span></h1><div class='docblock'><p>Client-side Wayland connector</p>
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<h2 id="overview" class="section-header"><a href="#overview">Overview</a></h2>
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<p>This crate provides the interfaces and machinery to safely create
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client applications for the wayland protocol. It is a rust wrapper
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around the <code>libwayland-client.so</code> C library.</p>
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<p>The wayland protocol revolves around the creation of various objects
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and the exchange of messages associated to these objects. The initial
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object is always the <code>Display</code>, that you get at initialization of the
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connection, exposed by this crate as <code>Display::connect_to_env()</code>.</p>
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<h2 id="protocol-and-messages-handling-model" class="section-header"><a href="#protocol-and-messages-handling-model">Protocol and messages handling model</a></h2>
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<p>The protocol being bi-directional, you can send and receive messages.
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Sending messages is done via methods of <code>Proxy<_></code> objects, receiving
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and handling them is done by providing implementations.</p>
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<h3 id="proxies" class="section-header"><a href="#proxies">Proxies</a></h3>
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<p>Wayland protocol objects are represented in this crate by <code>Proxy<I></code>
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objects, where <code>I</code> is a type representing the interface of the considered
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object. And object's interface (think "class" in an object-oriented context)
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defines which messages it can send and receive.</p>
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<p>These proxies are used to send messages to the server (in the wayland context,
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these are called "requests"). To do so, you need to import the appropriate
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extension trait adding these methods. For example, to use a <code>Proxy<WlSurface></code>,
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you need to import <code>protocol::wl_surface::RequestsTrait</code> from this crate.
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It is also possible to directly use the <code>Proxy::<I>::send(..)</code> method, but
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this should only be done carefully: using it improperly can mess the protocol
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state and cause protocol errors, which are fatal to the connection (the server
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will kill you).</p>
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<p>There is not a 1 to 1 mapping between <code>Proxy<I></code> instances and protocol
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objects. Rather, you can think of <code>Proxy<I></code> as an <code>Rc</code>-like handle to a
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wayland object. Multiple instances of it can exist referring to the same
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protocol object.</p>
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<p>Similarly, the lifetimes of the protocol objects and the <code>Proxy<I></code> are
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not tightly tied. As protocol objects are created and destroyed by protocol
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messages, it can happen that an object gets destroyed while one or more
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<code>Proxy<I></code> still refers to it. In such case, these proxies will be disabled
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and their <code>alive()</code> method will start to return <code>false</code>. Trying to send messages
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with them will also fail.</p>
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<h3 id="implementations-1" class="section-header"><a href="#implementations-1">Implementations</a></h3>
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<p>To receive and process messages from the server to you (in wayland context they are
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called "events"), you need to provide an <code>Implementation</code> for each wayland object
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created in the protocol session. Whenever a new protocol object is created, you will
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receive a <code>NewProxy<I></code> object. Providing an implementation via its <code>implement()</code> method
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will turn it into a regular <code>Proxy<I></code> object.</p>
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<p><strong>All objects must be implemented</strong>, even if it is an implementation doing nothing.
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Failure to do so (by dropping the <code>NewProxy<I></code> for example) can cause future fatal
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errors if the server tries to send an event to this object.</p>
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<p>An implementation is just an <code>FnMut(I::Event, Proxy<I>), where </code>I` is the interface of
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the considered object.</p>
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<h2 id="event-queues" class="section-header"><a href="#event-queues">Event Queues</a></h2>
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<p>The wayland client machinery provides the possibility to have one or more event queues
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handling the processing of received messages. All wayland objects are associated to an
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event queue, which controls when its events are dispatched.</p>
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<p>Events received from the server are stored in an internal buffer, and processed (by calling
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the appropriate implementations) when the associated event queue is dispatched.</p>
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<p>A default event queue is created at the same time as the initial <code>Display</code>, and by default
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whenever a wayland object is created, it inherits the queue of its parent (the object that sent
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or receive the message that created the new object). It means that if you only plan to use the
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default event queue, you don't need to worry about assigning objects to their queues.</p>
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<p>See the documentation of <code>EventQueue</code> for details about dispatching and integrating the event
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queue into the event loop of your application. See the <code>Proxy::make_wrapper()</code> method for
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details about assigning objects to event queues.</p>
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<h2 id="dynamic-linking-with-libwayland-clientso" class="section-header"><a href="#dynamic-linking-with-libwayland-clientso">Dynamic linking with <code>libwayland-client.so</code></a></h2>
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<p>If you need to gracefully handle the case of a system on which wayland is not installed (by
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fallbacking to X11 for example), you can do so by activating the <code>dlopen</code> cargo feature.</p>
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<p>When this is done, the library will be loaded a runtime rather than directly linked. And trying
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to create a <code>Display</code> on a system that does not have this library will return a <code>NoWaylandLib</code>
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error.</p>
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<h2 id="auxiliary-libraries" class="section-header"><a href="#auxiliary-libraries">Auxiliary libraries</a></h2>
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<p>Two auxiliary libraries are also available behind cargo features:</p>
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<ul>
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<li>the <code>cursor</code> feature will try to load <code>libwayland-cursor.so</code>, a library helping with loading
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system themed cursor textures, to integrate your app in the system theme.</li>
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<li>the <code>egl</code> feature will try to load <code>libwayland-egl.so</code>, a library allowing the creation of
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OpenGL surface from wayland surfaces.</li>
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</ul>
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<p>Both of them will also be loaded at runtime if the <code>dlopen</code> feature was provided. See their
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respective submodules for details about their use.</p>
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<h3 id="event-loop-integration" class="section-header"><a href="#event-loop-integration">Event Loop integration</a></h3>
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<p>The <code>eventloop</code> cargo feature adds the necessary implementations to use an <code>EventQueue</code>
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as a <code>calloop</code> event source. If you want to use it, here are a few points to take into
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account:</p>
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<ul>
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<li>The <code>EventQueue</code> will not call its associated callback, but rather manage all the
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event dispatching internally. As a result, there is no point registering it to
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<code>calloop</code> with anything other than a dummy callback.</li>
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<li>You still need to call <code>Display::flush()</code> yourself between <code>calloop</code>s dispatches,
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or in the <code>EventLoop::run()</code> callback of <code>calloop</code>.</li>
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</ul>
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</div><h2 id='modules' class='section-header'><a href="#modules">Modules</a></h2>
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<table><tr class='module-item'><td><a class="mod" href="cursor/index.html" title='wayland_client::cursor mod'>cursor</a></td><td class='docblock-short'><p>Cursor utilities</p>
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</td></tr><tr class='module-item'><td><a class="mod" href="egl/index.html" title='wayland_client::egl mod'>egl</a></td><td class='docblock-short'><p>EGL utilities</p>
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</td></tr><tr class='module-item'><td><a class="mod" href="protocol/index.html" title='wayland_client::protocol mod'>protocol</a></td><td class='docblock-short'><p>Generated interfaces for the core wayland protocol</p>
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</td></tr><tr class='module-item'><td><a class="mod" href="sys/index.html" title='wayland_client::sys mod'>sys</a></td><td class='docblock-short'><p>C-associated types</p>
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</td></tr></table><h2 id='macros' class='section-header'><a href="#macros">Macros</a></h2>
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<table><tr class='module-item'><td><a class="macro" href="macro.global_filter.html" title='wayland_client::global_filter macro'>global_filter</a></td><td class='docblock-short'><p>Convenience macro to create a <code>GlobalManager</code> callback</p>
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</td></tr></table><h2 id='structs' class='section-header'><a href="#structs">Structs</a></h2>
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<table><tr class='module-item'><td><a class="struct" href="struct.AnonymousObject.html" title='wayland_client::AnonymousObject struct'>AnonymousObject</a></td><td class='docblock-short'><p>Anonymous interface</p>
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</td></tr><tr class='module-item'><td><a class="struct" href="struct.Display.html" title='wayland_client::Display struct'>Display</a></td><td class='docblock-short'><p>A connection to a wayland server</p>
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</td></tr><tr class='module-item'><td><a class="struct" href="struct.EventQueue.html" title='wayland_client::EventQueue struct'>EventQueue</a></td><td class='docblock-short'><p>An event queue for protocol messages</p>
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</td></tr><tr class='module-item'><td><a class="struct" href="struct.GlobalManager.html" title='wayland_client::GlobalManager struct'>GlobalManager</a></td><td class='docblock-short'><p>An utility to manage global objects</p>
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</td></tr><tr class='module-item'><td><a class="struct" href="struct.NewProxy.html" title='wayland_client::NewProxy struct'>NewProxy</a></td><td class='docblock-short'><p>A newly-created proxy that needs implementation</p>
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</td></tr><tr class='module-item'><td><a class="struct" href="struct.Proxy.html" title='wayland_client::Proxy struct'>Proxy</a></td><td class='docblock-short'><p>An handle to a wayland proxy</p>
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</td></tr><tr class='module-item'><td><a class="struct" href="struct.QueueToken.html" title='wayland_client::QueueToken struct'>QueueToken</a></td><td class='docblock-short'><p>A token representing this event queue</p>
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</td></tr><tr class='module-item'><td><a class="struct" href="struct.ReadEventsGuard.html" title='wayland_client::ReadEventsGuard struct'>ReadEventsGuard</a></td><td class='docblock-short'><p>A guard over a read intention.</p>
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</td></tr></table><h2 id='enums' class='section-header'><a href="#enums">Enums</a></h2>
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<table><tr class='module-item'><td><a class="enum" href="enum.ConnectError.html" title='wayland_client::ConnectError enum'>ConnectError</a></td><td class='docblock-short'><p>Enum representing the possible reasons why connecting to the wayland server failed</p>
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</td></tr><tr class='module-item'><td><a class="enum" href="enum.GlobalError.html" title='wayland_client::GlobalError enum'>GlobalError</a></td><td class='docblock-short'><p>An error that occurred trying to bind a global</p>
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</td></tr><tr class='module-item'><td><a class="enum" href="enum.GlobalEvent.html" title='wayland_client::GlobalEvent enum'>GlobalEvent</a></td><td class='docblock-short'><p>Event provided to the user callback of GlobalManager</p>
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</td></tr><tr class='module-item'><td><a class="enum" href="enum.NoMessage.html" title='wayland_client::NoMessage enum'>NoMessage</a></td><td class='docblock-short'><p>An empty enum representing a MessageGroup with no messages</p>
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</td></tr><tr class='module-item'><td><a class="enum" href="enum.ProxyMap.html" title='wayland_client::ProxyMap enum'>ProxyMap</a></td><td class='docblock-short'><p>This type only exists for type-level compatibility
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with the rust implementation.</p>
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</td></tr></table><h2 id='traits' class='section-header'><a href="#traits">Traits</a></h2>
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<table><tr class='module-item'><td><a class="trait" href="trait.GlobalImplementor.html" title='wayland_client::GlobalImplementor trait'>GlobalImplementor</a></td><td class='docblock-short'><p>A trait for implementation of the global advertisement</p>
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</td></tr><tr class='module-item'><td><a class="trait" href="trait.Interface.html" title='wayland_client::Interface trait'>Interface</a></td><td class='docblock-short'><p>The description of a wayland interface</p>
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</td></tr><tr class='module-item'><td><a class="trait" href="trait.MessageGroup.html" title='wayland_client::MessageGroup trait'>MessageGroup</a></td><td class='docblock-short'><p>A group of messages</p>
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</td></tr></table></section><section id="search" class="content hidden"></section><section class="footer"></section><aside id="help" class="hidden"><div><h1 class="hidden">Help</h1><div class="shortcuts"><h2>Keyboard Shortcuts</h2><dl><dt><kbd>?</kbd></dt><dd>Show this help dialog</dd><dt><kbd>S</kbd></dt><dd>Focus the search field</dd><dt><kbd>↑</kbd></dt><dd>Move up in search results</dd><dt><kbd>↓</kbd></dt><dd>Move down in search results</dd><dt><kbd>↹</kbd></dt><dd>Switch tab</dd><dt><kbd>⏎</kbd></dt><dd>Go to active search result</dd><dt><kbd>+</kbd></dt><dd>Expand all sections</dd><dt><kbd>-</kbd></dt><dd>Collapse all sections</dd></dl></div><div class="infos"><h2>Search Tricks</h2><p>Prefix searches with a type followed by a colon (e.g., <code>fn:</code>) to restrict the search to a given type.</p><p>Accepted types are: <code>fn</code>, <code>mod</code>, <code>struct</code>, <code>enum</code>, <code>trait</code>, <code>type</code>, <code>macro</code>, and <code>const</code>.</p><p>Search functions by type signature (e.g., <code>vec -> usize</code> or <code>* -> vec</code>)</p><p>Search multiple things at once by splitting your query with comma (e.g., <code>str,u8</code> or <code>String,struct:Vec,test</code>)</p></div></div></aside><script>window.rootPath = "../";window.currentCrate = "wayland_client";</script><script src="../aliases.js"></script><script src="../main.js"></script><script defer src="../search-index.js"></script></body></html>
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