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|
use super::prelude::*;
/// `move`: Move content without affecting layout.
pub fn move_(_: &mut EvalContext, args: &mut Args) -> TypResult<Value> {
let x = args.named("x")?;
let y = args.named("y")?;
let body: Template = args.expect("body")?;
Ok(Value::Template(Template::from_inline(move |style| {
MoveNode {
offset: Spec::new(x, y),
child: body.pack(style),
}
})))
}
#[derive(Debug, Hash)]
struct MoveNode {
offset: Spec<Option<Linear>>,
child: PackedNode,
}
impl Layout for MoveNode {
fn layout(
&self,
ctx: &mut LayoutContext,
regions: &Regions,
) -> Vec<Constrained<Rc<Frame>>> {
let mut frames = self.child.layout(ctx, regions);
for (Constrained { item: frame, .. }, (_, base)) in
frames.iter_mut().zip(regions.iter())
{
let offset = Point::new(
self.offset.x.map(|x| x.resolve(base.w)).unwrap_or_default(),
self.offset.y.map(|y| y.resolve(base.h)).unwrap_or_default(),
);
for (point, _) in &mut Rc::make_mut(frame).elements {
*point += offset;
}
}
frames
}
}
|
