Struct UiWaker 

pub struct UiWaker(/* private fields */);

Rebuilds the UI from any thread, when background work has something to show.

Get one with BuildCx::ui_waker and move it to the thread. Send the result through a channel and call UiWaker::wake; the next build runs on the UI thread and reads the channel. Between wakes the app stays asleep, so there is nothing to poll.

use std::sync::mpsc::channel;
use ravenrs_widgets::{BuildCx, NodeId, View};

struct Pump;

impl View for Pump {
    fn build(&self, cx: &mut BuildCx<'_>) -> NodeId {
        let waker = cx.ui_waker();
        let (send, _receive) = channel();
        std::thread::spawn(move || {
            let _ = send.send(21 * 2);
            waker.wake();
        });
        cx.empty()
    }
}

The web build has no other threads to wake it from; there, change a State as usual.

Implementations

impl UiWaker

pub fn wake(&self)

Asks for a rebuild. Calls made before it happens count as one.

Trait Implementations

impl Clone for UiWaker

fn clone(&self) -> UiWaker

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for UiWaker

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

Formats the value using the given formatter.

impl Default for UiWaker

fn default() -> UiWaker

Returns the “default value” for a type.