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use super::*;
use crate::geom::Linear;
/// A node that adds padding to its child.
#[derive(Debug, Clone, PartialEq)]
pub struct NodePad {
/// The amount of padding.
pub padding: Sides<Linear>,
/// The child node whose sides to pad.
pub child: Node,
}
impl Layout for NodePad {
fn layout(&self, ctx: &mut LayoutContext, areas: &Areas) -> Layouted {
let areas = shrink(areas, self.padding);
let mut layouted = self.child.layout(ctx, &areas);
for frame in layouted.frames_mut() {
pad(frame, self.padding);
}
layouted
}
}
impl From<NodePad> for NodeAny {
fn from(pad: NodePad) -> Self {
Self::new(pad)
}
}
/// Shrink all areas by the padding.
fn shrink(areas: &Areas, padding: Sides<Linear>) -> Areas {
let shrink = |size| size - padding.resolve(size).size();
Areas {
current: shrink(areas.current),
full: shrink(areas.full),
backlog: areas.backlog.iter().copied().map(shrink).collect(),
last: areas.last.map(shrink),
}
}
/// Enlarge the box and move all elements inwards.
fn pad(frame: &mut Frame, padding: Sides<Linear>) {
let padding = padding.resolve(frame.size);
let origin = Point::new(padding.left, padding.top);
frame.size += padding.size();
for (point, _) in &mut frame.elements {
*point += origin;
}
}
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