mirror of
https://github.com/zed-industries/zed.git
synced 2024-10-27 08:50:29 +00:00
118 lines
2.8 KiB
Rust
118 lines
2.8 KiB
Rust
use crate::{
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geometry::{rect::RectF, vector::Vector2F},
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json, AnyElement, Element, LayoutContext, SceneBuilder, SizeConstraint, View, ViewContext,
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};
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use json::ToJson;
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use serde_json::json;
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pub struct Align<V: View> {
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child: AnyElement<V>,
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alignment: Vector2F,
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}
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impl<V: View> Align<V> {
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pub fn new(child: AnyElement<V>) -> Self {
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Self {
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child,
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alignment: Vector2F::zero(),
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}
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}
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pub fn top(mut self) -> Self {
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self.alignment.set_y(-1.0);
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self
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}
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pub fn bottom(mut self) -> Self {
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self.alignment.set_y(1.0);
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self
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}
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pub fn left(mut self) -> Self {
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self.alignment.set_x(-1.0);
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self
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}
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pub fn right(mut self) -> Self {
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self.alignment.set_x(1.0);
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self
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}
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}
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impl<V: View> Element<V> for Align<V> {
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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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view: &mut V,
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cx: &mut LayoutContext<V>,
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) -> (Vector2F, Self::LayoutState) {
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let mut size = constraint.max;
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constraint.min = Vector2F::zero();
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let child_size = self.child.layout(constraint, view, cx);
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if size.x().is_infinite() {
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size.set_x(child_size.x());
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}
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if size.y().is_infinite() {
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size.set_y(child_size.y());
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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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scene: &mut SceneBuilder,
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bounds: RectF,
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visible_bounds: RectF,
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_: &mut Self::LayoutState,
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view: &mut V,
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cx: &mut ViewContext<V>,
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) -> Self::PaintState {
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let my_center = bounds.size() / 2.;
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let my_target = my_center + my_center * self.alignment;
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let child_center = self.child.size() / 2.;
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let child_target = child_center + child_center * self.alignment;
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self.child.paint(
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scene,
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bounds.origin() - (child_target - my_target),
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visible_bounds,
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view,
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cx,
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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: std::ops::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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view: &V,
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cx: &ViewContext<V>,
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) -> Option<RectF> {
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self.child.rect_for_text_range(range_utf16, view, cx)
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}
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fn debug(
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&self,
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bounds: pathfinder_geometry::rect::RectF,
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_: &Self::LayoutState,
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_: &Self::PaintState,
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view: &V,
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cx: &ViewContext<V>,
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) -> json::Value {
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json!({
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"type": "Align",
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"bounds": bounds.to_json(),
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"alignment": self.alignment.to_json(),
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"child": self.child.debug(view, cx),
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})
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}
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}
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