Trait Catalog

pub trait Catalog {
    type Class<'a>;

    // Required methods
    fn default<'a>() -> Self::Class<'a>;
    fn style(&self, class: &Self::Class<'_>, status: Status) -> Style;
}

The theme catalog of a Button.

All themes that can be used with Button must implement this trait.

Example

#[derive(Debug, Default)]
pub enum ButtonClass {
    #[default]
    Primary,
    Secondary,
    Danger
}

impl Catalog for MyTheme {
    type Class<'a> = ButtonClass;
     
    fn default<'a>() -> Self::Class<'a> {
        ButtonClass::default()
    }
     

    fn style(&self, class: &Self::Class<'_>, status: Status) -> Style {
        let mut style = Style::default();

        match class {
            ButtonClass::Primary => {
                style.background = Some(Background::Color(Color::from_rgb(0.529, 0.808, 0.921)));
            },
            ButtonClass::Secondary => {
                style.background = Some(Background::Color(Color::WHITE));
            },
            ButtonClass::Danger => {
                style.background = Some(Background::Color(Color::from_rgb(0.941, 0.502, 0.502)));
            },
        }

        style
    }
}

Although, in order to use Button::style with MyTheme, Catalog::Class must implement From<StyleFn<'_, MyTheme>>.

Required Associated Types

type Class<'a>

The item class of the Catalog.

Required Methods

fn default<'a>() -> Self::Class<'a>

The default class produced by the Catalog.

fn style(&self, class: &Self::Class<'_>, status: Status) -> Style

The Style of a class with the given status.

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

impl Catalog for Theme

type Class<'a> = Box<dyn Fn(&Theme, Status) -> Style + 'a>