95 lines
2.3 KiB
Rust
95 lines
2.3 KiB
Rust
use std::ops::Range;
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use crate::{
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geometry::{rect::RectF, vector::Vector2F},
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json::{self, json, ToJson},
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presenter::MeasurementContext,
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DebugContext, Element, ElementBox, LayoutContext, PaintContext, SizeConstraint,
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};
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/// Element which renders it's children in a stack on top of each other.
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/// The first child determines the size of the others.
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#[derive(Default)]
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pub struct Stack {
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children: Vec<ElementBox>,
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}
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impl Stack {
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pub fn new() -> Self {
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Self::default()
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}
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}
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impl Element for Stack {
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type LayoutState = ();
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type PaintState = ();
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fn layout(
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&mut self,
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mut constraint: SizeConstraint,
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cx: &mut LayoutContext,
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) -> (Vector2F, Self::LayoutState) {
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let mut size = constraint.min;
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let mut children = self.children.iter_mut();
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if let Some(bottom_child) = children.next() {
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size = bottom_child.layout(constraint, cx);
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constraint = SizeConstraint::strict(size);
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}
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for child in children {
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child.layout(constraint, cx);
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}
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(size, ())
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}
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fn paint(
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&mut self,
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bounds: RectF,
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visible_bounds: RectF,
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_: &mut Self::LayoutState,
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cx: &mut PaintContext,
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) -> Self::PaintState {
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for child in &mut self.children {
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cx.paint_layer(None, |cx| {
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child.paint(bounds.origin(), visible_bounds, cx);
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});
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}
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}
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fn rect_for_text_range(
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&self,
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range_utf16: Range<usize>,
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_: RectF,
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_: RectF,
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_: &Self::LayoutState,
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_: &Self::PaintState,
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cx: &MeasurementContext,
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) -> Option<RectF> {
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self.children
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.iter()
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.rev()
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.find_map(|child| child.rect_for_text_range(range_utf16.clone(), cx))
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}
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fn debug(
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&self,
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bounds: RectF,
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_: &Self::LayoutState,
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_: &Self::PaintState,
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cx: &DebugContext,
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) -> json::Value {
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json!({
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"type": "Stack",
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"bounds": bounds.to_json(),
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"children": self.children.iter().map(|child| child.debug(cx)).collect::<Vec<json::Value>>()
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})
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}
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}
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impl Extend<ElementBox> for Stack {
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fn extend<T: IntoIterator<Item = ElementBox>>(&mut self, children: T) {
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self.children.extend(children)
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}
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}
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