Struct tao::event_loop::EventLoop

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

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.

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.

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 tao 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.

Platform-specific

• Unix: The program terminates with exit code 1 if the display server disconnects.

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.

pub fn monitor_from_point(&self, x: f64, y: f64) -> Option<MonitorHandle>

Returns the monitor that contains the given point.

Platform-specific:

• Android / iOS: Unsupported.

pub fn set_device_event_filter(&self, _filter: DeviceEventFilter)

Change DeviceEvent filter mode.

Since the DeviceEvent capture can lead to high CPU usage for unfocused windows, tao will ignore them by default for unfocused windows. This method allows changing this filter at runtime to explicitly capture them again.

Platform-specific

• Linux / macOS / iOS / Android: Unsupported.

Trait Implementations

impl<T> Debug for EventLoop<T>

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

Formats the value using the given formatter.

impl Default for EventLoop<()>

fn default() -> Self

Returns the “default value” for a type.

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) -> i32

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

Initializes the tao event loop.

impl<T> EventLoopExtUnix for EventLoop<T>

fn new_any_thread() -> Self

Builds a new EventLoop on any thread.

impl<T> Deref for EventLoop<T>

type Target = EventLoopWindowTarget<T>

The resulting type after dereferencing.

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

Dereferences the value.