Macro zng::widget::wgt_fn

macro_rules! wgt_fn {
    ($fn:path) => { ... };
    ($($tt:tt)+) => { ... };
    () => { ... };
}

Declares a widget function closure.

The output type is a WidgetFn, the closure is clmv!.

Syntax

• wgt_fn!(cloned, |_args| Wgt!()) - Clone-move closure, the same syntax as clmv! you can list the cloned values before the closure.
• wgt_fn!(path::to::func) - The macro also accepts unction, the signature must receive the args and return a widget.
• wgt_fn!() - An empty call generates the WidgetFn::nil() value.

Examples

Declares a basic widget function that ignores the argument and does not capture any value:

wgt_fn!(|_| Wgt! {
    on_init = hn!(|_| println!("generated widget init"));
});

The macro is clone-move, meaning you can use the same syntax as clmv! to capture clones of values:

let moved_var = var('a');
let cloned_var = var('b');

wgt_fn!(cloned_var, |args| {
    println!(
        "wgt_fn, args: {:?}, moved_var: {}, cloned_var: {}",
        args,
        moved_var.get(),
        cloned_var.get()
    );
    Wgt!()
});