bevy_cef 0.9.0

Bevy CEF integration for web rendering
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use async_channel::{Receiver, Sender};
use bevy::prelude::*;
use bevy::window::{CursorIcon, SystemCursorIcon};

/// This plugin manages the system cursor icon by receiving updates from CEF and applying them to the application window's cursor icon.
pub(super) struct SystemCursorIconPlugin;

impl Plugin for SystemCursorIconPlugin {
    fn build(&self, app: &mut App) {
        let (tx, rx) = async_channel::unbounded();
        app.insert_resource(SystemCursorIconSender(tx))
            .insert_resource(SystemCursorIconReceiver(rx))
            .init_resource::<crate::resize::cursor::SystemCursorOverride>()
            .add_systems(Update, update_cursor_icon);
    }
}

#[derive(Resource, Debug, Deref)]
pub(crate) struct SystemCursorIconSender(Sender<SystemCursorIcon>);

#[derive(Resource, Debug)]
pub(crate) struct SystemCursorIconReceiver(pub(crate) Receiver<SystemCursorIcon>);

fn update_cursor_icon(
    mut commands: Commands,
    cursor_icon_receiver: Res<SystemCursorIconReceiver>,
    cursor_override: Res<crate::resize::cursor::SystemCursorOverride>,
    windows: Query<Entity>,
) {
    // Override takes priority over CEF cursor.
    if let Some(override_icon) = cursor_override.get() {
        for entity in windows.iter() {
            commands
                .entity(entity)
                .try_insert(CursorIcon::System(override_icon));
        }
        // Drain the receiver so it doesn't pile up.
        while cursor_icon_receiver.0.try_recv().is_ok() {}
        return;
    }

    // Original CEF cursor path.
    while let Ok(cursor_icon) = cursor_icon_receiver.0.try_recv() {
        windows.iter().for_each(|window| {
            commands
                .entity(window)
                .try_insert(CursorIcon::System(cursor_icon));
        });
    }
}