Trait winit::platform::run_return::EventLoopExtRunReturn[−][src]

pub trait EventLoopExtRunReturn {
    type UserEvent;
    fn run_return<F>(&mut self, event_handler: F)
    where
        F: FnMut(Event<'_, Self::UserEvent>, &EventLoopWindowTarget<Self::UserEvent>, &mut ControlFlow);
}

Additional methods on EventLoop to return control flow to the caller.

Associated Types

type UserEvent[src]

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

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Required methods

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

Initializes the winit event loop.

Unlike run, this function accepts non-'static (i.e. non-move) closures and returns control flow to the caller when control_flow is set to ControlFlow::Exit.

Caveats

Despite its appearance at first glance, this is not a perfect replacement for poll_events. For example, this function will not return on Windows or macOS while a window is getting resized, resulting in all application logic outside of the event_handler closure not running until the resize operation ends. Other OS operations may also result in such freezes. This behavior is caused by fundamental limitations in the underlying OS APIs, which cannot be hidden by winit without severe stability repercussions.

You are strongly encouraged to use run, unless the use of this is absolutely necessary.

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Implementors

impl<T> EventLoopExtRunReturn for EventLoop<T>[src]

type UserEvent = T

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