khalas 0.2.0

UI Library based on Seed
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use crate::css::{unit::*, values as val, St, StyleMap, ToStyleMap};
use derive_rich::Rich;

#[derive(Rich, Clone, Debug, Copy, PartialEq, From, Default)]
pub struct Margin {
    #[rich(read, write)]
    top: Option<Length>,
    #[rich(read, write)]
    right: Option<Length>,
    #[rich(read, write)]
    bottom: Option<Length>,
    #[rich(read, write)]
    left: Option<Length>,
}

impl From<Length> for Margin {
    fn from(source: Length) -> Self {
        let mut margin = Self::default();
        margin.all(source);
        margin
    }
}

impl ToStyleMap for Margin {
    fn style_map(&self) -> StyleMap {
        let mut map = StyleMap::default();
        map.try_add(St::MarginTop, self.top)
            .try_add(St::MarginRight, self.right)
            .try_add(St::MarginBottom, self.bottom)
            .try_add(St::MarginLeft, self.left);
        map
    }
}

impl Margin {
    pub fn all(&mut self, value: impl Into<Length>) -> &mut Self {
        let value = value.into();
        self.right(value).top(value).left(value).bottom(value)
    }

    pub fn zero(&mut self) -> &mut Self {
        self.all(px(0.))
    }

    pub fn x(&mut self, value: impl Into<Length>) -> &mut Self {
        let value = value.into();
        self.left(value).right(value)
    }

    pub fn y(&mut self, value: impl Into<Length>) -> &mut Self {
        let value = value.into();
        self.top(value).bottom(value)
    }

    pub fn horizontal(&mut self, value: impl Into<Length>) -> &mut Self {
        self.y(value)
    }

    pub fn vertical(&mut self, value: impl Into<Length>) -> &mut Self {
        self.x(value)
    }

    pub fn auto(&mut self) -> &mut Self {
        self.all(val::Auto)
    }

    pub fn full(&mut self) -> &mut Self {
        self.all(1.)
    }

    pub fn half(&mut self) -> &mut Self {
        self.all(0.5)
    }
}

#[derive(Clone, Debug, Copy, PartialEq, Display, From)]
pub enum Length {
    #[from]
    Auto(val::Auto),
    #[from]
    Em(Em),
    #[from]
    Ex(Ex),
    #[from]
    Cap(Cap),
    #[from]
    Ch(Ch),
    #[from]
    Ic(Ic),
    #[from]
    Rem(Rem),
    #[from]
    Rlh(Rlh),
    #[from]
    Vm(Vm),
    #[from]
    Vh(Vh),
    #[from]
    Vi(Vi),
    #[from]
    Vb(Vb),
    #[from]
    Vmin(Vmin),
    #[from]
    Vmax(Vmax),
    #[from]
    Cm(Cm),
    #[from]
    Mm(Mm),
    #[from]
    Q(Q),
    #[from]
    In(In),
    #[from]
    Pc(Pc),
    #[from]
    Pt(Pt),
    #[from]
    Px(Px),
    #[from(forward)]
    Percent(Percent),
}

impl Default for Length {
    fn default() -> Self {
        val::Auto.into()
    }
}