zhc_ir 0.8.0

Graph-based intermediate representation framework with dialect support
Documentation 
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use super::*;
use zhc_utils::graphics::{Color, Frame, Size};

/// Empty element that takes up space according to its padding but renders nothing.
pub struct Empty<C: Class = NoClass> {
    styler: Styler<C>,
    variable: VariableCell,
}

impl<C: Class> Empty<C> {
    /// Creates a new empty element.
    pub fn new(modifier: Option<StyleModifier>) -> Self {
        Self {
            styler: Styler::new(modifier),
            variable: VariableCell::fresh(),
        }
    }
}

impl<C: Class> SceneElement for Empty<C> {
    fn get_size(&self) -> Size {
        self.variable.get_size()
    }

    fn get_frame(&self) -> Frame {
        self.variable.get_frame()
    }

    fn get_variable_cell(&self) -> VariableCell {
        self.variable.clone()
    }
}

impl<C: Class> SceneSolver for Empty<C> {
    fn solve_size(&mut self) {
        let style = C::STYLE;
        let size = Size::ZERO.pad(style.padding);
        self.variable.set_size(size);
    }

    fn solve_frame(&mut self, available: Frame) {
        let style = self.styler.get();
        let frame = available.resize(&self.get_size(), style.halign, style.valign);
        self.variable.set_frame(frame);
    }
}

impl<C: Class> Renderable for Empty<C> {
    fn render(&self) -> Vec<SvgElement> {
        let style = self.styler.get();
        let frame = self.get_frame();

        // Only render if there's something visible
        if style.fill_color == Color::TRANSPARENT && style.border_color == Color::TRANSPARENT {
            return vec![];
        }

        vec![SvgElement::Rect {
            x: frame.position.x.0,
            y: frame.position.y.0,
            width: frame.size.width.0.0,
            height: frame.size.height.0.0,
            rx: (style.corner_radius.0 > 0.0).then_some(style.corner_radius.0),
            fill: Some(style.fill_color.to_string()),
            stroke: Some(style.border_color.to_string()),
            stroke_width: Some(style.border_width.0),
            class: None,
            id: None,
            data_val: None,
        }]
    }
}