Trait ChildPropertyExt

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pub(crate) trait ChildPropertyExt {
    // Required methods
    fn child_property(&self) -> Option<Widget>;
    fn set_child_property(&self, child: Option<&impl IsA<Widget>>);

    // Provided methods
    fn child_or_else<W>(&self, f: impl FnOnce() -> W) -> W
       where W: IsA<Widget> { ... }
    fn child_or_default<W>(&self) -> W
       where W: IsA<Widget> + Default { ... }
}

Expand description

Extensions trait for types with a child property.

Required Methods§

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fn child_property(&self) -> Option<Widget>

The child of this widget, is any.

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fn set_child_property(&self, child: Option<&impl IsA<Widget>>)

Set the child of this widget.

Provided Methods§

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fn child_or_else<W>(&self, f: impl FnOnce() -> W) -> W
where W: IsA<Widget>,

Get the child if it is of the proper type, or construct it with the given function and set is as the child of this widget before returning it.

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fn child_or_default<W>(&self) -> W
where W: IsA<Widget> + Default,

Get the child if it is of the proper type, or construct it with its Default implementation and set is as the child of this widget before returning it.