iris-ai
f6242aa33c
A share child was drawn in the measuring room and again in its slot, and one record holding two questions made every local change under it defer to the span. Where a rule or a hint gives the length along the span, the first ask answers nothing the rule does not, so the child is asked once, in its slot; the widgets that always report the whole of their box now say so. A hint with a fraction resolves against the frame and pins it. The dump rig prints every cold layout so a change to it shows in a diff.
106 lines
3.3 KiB
Rust
106 lines
3.3 KiB
Rust
use std::marker::PhantomData;
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use crate::prelude::*;
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pub struct Stack {
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pub children: Vec<StrongWidget>,
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pub size: StackSize,
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}
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impl Widget for Stack {
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fn draw(&mut self, painter: &mut Painter) -> Size {
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let sizing = match self.size {
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StackSize::Default => None,
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StackSize::Child(i) => Some(i),
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};
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// Whichever child sizes the stack is given the stack's whole box --
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// the stack is the length that child asked for, so placing that
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// answer inside the box it decided would apply it twice.
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let size = match sizing.and_then(|i| self.children.get(i).map(|c| (i, c))) {
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// On the layer that child ends up on, so the ask below is a reuse
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// rather than a second drawing of it somewhere else: a retained
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// drawing belongs to the layer it was made on.
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Some((i, child)) => {
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painter.child_layer_at(i);
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painter
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.widget_at(child, [None; 2], [Place::Fill(Part::All); 2])
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.size()
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}
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None => Size::LEFTOVER,
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};
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// Every other child gets the box the sizing child decided: the
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// stack is that length, so that is the box they are asked in, and a
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// fraction under them is a fraction of it. A share leaves the axis
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// to whoever gave the stack its box. Where a child sits in a box
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// bigger than itself is its own business.
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let place = [Axis::X, Axis::Y].map(|axis| {
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let len = size.axis(axis);
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match len.leftover == Weight::ZERO {
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true => Place::Fill(Part::Sized(Len::from_parts(len.rel, len.px))),
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false => Place::Within(Part::All),
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}
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});
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for (i, child) in self.children.iter().enumerate() {
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if sizing == Some(i) {
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continue;
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}
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painter.child_layer_at(i);
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painter.widget_at(child, [None; 2], place);
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}
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size
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}
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/// Without a sizing child a stack is whatever box it is given, which it
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/// can say without drawing anything.
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fn size_hint(&self, _: Axis) -> Option<LayoutLen> {
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match self.size {
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StackSize::Default => Some(LayoutLen::LEFTOVER),
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StackSize::Child(_) => None,
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}
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}
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}
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#[derive(Default, Debug)]
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pub enum StackSize {
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#[default]
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Default,
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Child(usize),
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}
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pub struct StackBuilder<State, const LEN: usize, Wa: WidgetArrLike<State, LEN, Tag>, Tag> {
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pub children: Wa,
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pub size: StackSize,
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_pd: PhantomData<(State, Tag)>,
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}
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impl<Rsc, const LEN: usize, Wa: WidgetArrLike<Rsc, LEN, Tag>, Tag> WidgetFnTrait<Rsc>
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for StackBuilder<Rsc, LEN, Wa, Tag>
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{
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type Widget = Stack;
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#[track_caller]
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fn run(self, rsc: &mut Rsc) -> Self::Widget {
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Stack {
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children: self.children.add(rsc).arr.into_iter().collect(),
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size: self.size,
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}
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}
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}
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impl<State, const LEN: usize, Wa: WidgetArrLike<State, LEN, Tag>, Tag>
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StackBuilder<State, LEN, Wa, Tag>
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{
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pub fn new(children: Wa) -> Self {
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Self {
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children,
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size: StackSize::default(),
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_pd: PhantomData,
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}
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}
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pub fn size(mut self, size: StackSize) -> Self {
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self.size = size;
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self
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}
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}
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