kas_core::layout

Trait LayoutVisitor

Source 
pub trait LayoutVisitor {
    // Required method
    fn layout_visitor(&mut self) -> Visitor<impl Visitable>;
}
Expand description

Macro-generated implementation of layout over a [Visitor]

This method is implemented by the #widget macro when a layout specification is provided. Direct implementations of this trait are not supported.

This trait may be used in user-code where a layout specification is used and custom behaviour is provided for one or more layout methods, for example:

use kas::prelude::*;

impl_scope! {
    #[widget {
        Data = ();
        layout = "Example";
    }]
    struct Example {
        core: widget_core!(),
    }
    impl Layout for Self {
        fn size_rules(&mut self, sizer: SizeCx, axis: AxisInfo) -> SizeRules {
            let mut rules = self.layout_visitor().size_rules(sizer, axis);
            rules.set_stretch(Stretch::High);
            rules
        }
    }
}

Required Methods§

Source

fn layout_visitor(&mut self) -> Visitor<impl Visitable>

Layout defined by a [Visitor]

Dyn Compatibility§

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementors§