Struct winit::event_loop::EventLoop

pub struct EventLoop<T: 'static> { /* fields omitted */ }

Provides a way to retrieve events from the system and from the windows that were registered to the events loop.

An EventLoop can be seen more or less as a “context”. Calling EventLoop::new() initializes everything that will be required to create windows. For example on Linux creating an event loop opens a connection to the X or Wayland server.

To wake up an EventLoop from a another thread, see the EventLoopProxy docs.

Note that the EventLoop cannot be shared across threads (due to platform-dependant logic forbidding it), as such it is neither Send nor Sync. If you need cross-thread access, the Window created from this EventLoop can be sent to an other thread, and the EventLoopProxy allows you to wake up an EventLoop from another thread.

Implementations

impl EventLoop<()>

pub fn new() -> EventLoop<()>

Builds a new event loop with a () as the user event type.

For cross-platform compatibility, the EventLoop must be created on the main thread. Attempting to create the event loop on a different thread will panic. This restriction isn’t strictly necessary on all platforms, but is imposed to eliminate any nasty surprises when porting to platforms that require it. EventLoopExt::new_any_thread functions are exposed in the relevant platform module if the target platform supports creating an event loop on any thread.

Usage will result in display backend initialisation, this can be controlled on linux using an environment variable WINIT_UNIX_BACKEND. Legal values are x11 and wayland. If it is not set, winit will try to connect to a wayland connection, and if it fails will fallback on x11. If this variable is set with any other value, winit will panic.

Platform-specific

• iOS: Can only be called on the main thread.

impl<T> EventLoop<T>

pub fn with_user_event() -> EventLoop<T>

Builds a new event loop.

All caveats documented in EventLoop::new apply to this function.

Platform-specific

• iOS: Can only be called on the main thread.

pub fn run<F>(self, event_handler: F) -> ! where
    F: 'static + FnMut(Event<'_, T>, &EventLoopWindowTarget<T>, &mut ControlFlow), 

Hijacks the calling thread and initializes the winit event loop with the provided closure. Since the closure is 'static, it must be a move closure if it needs to access any data from the calling context.

See the ControlFlow docs for information on how changes to &mut ControlFlow impact the event loop’s behavior.

Any values not passed to this function will not be dropped.

pub fn create_proxy(&self) -> EventLoopProxy<T>

Creates an EventLoopProxy that can be used to dispatch user events to the main event loop.

Methods from Deref<Target = EventLoopWindowTarget<T>>

pub fn available_monitors(&self) -> impl Iterator<Item = MonitorHandle>

Returns the list of all the monitors available on the system.

pub fn primary_monitor(&self) -> Option<MonitorHandle>

Returns the primary monitor of the system.

Returns None if it can’t identify any monitor as a primary one.

Platform-specific

Wayland: Always returns None.

Trait Implementations

impl<T> Debug for EventLoop<T>

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

Formats the value using the given formatter.

impl<T> Deref for EventLoop<T>

type Target = EventLoopWindowTarget<T>

The resulting type after dereferencing.

fn deref(&self) -> &EventLoopWindowTarget<T>

Dereferences the value.

impl<T> EventLoopExtRunReturn for EventLoop<T>

type UserEvent = T

A type provided by the user that can be passed through Event::UserEvent.

fn run_return<F>(&mut self, event_handler: F) where
    F: FnMut(Event<'_, Self::UserEvent>, &EventLoopWindowTarget<Self::UserEvent>, &mut ControlFlow), 

Initializes the winit event loop.

impl<T> EventLoopExtWindows for EventLoop<T>

fn new_any_thread() -> Self

Creates an event loop off of the main thread.

fn new_dpi_unaware() -> Self

By default, winit on Windows will attempt to enable process-wide DPI awareness. If that’s undesirable, you can create an EventLoop using this function instead.

fn new_dpi_unaware_any_thread() -> Self

Creates a DPI-unaware event loop off of the main thread.