1b03c5d69c
I want to use this on another branch, but it's a sweeping change, so this prepares the ground for it. This can always be reverted if it doesn't work out.
88 lines
2 KiB
Rust
88 lines
2 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::json,
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AnyElement, Element, LayoutContext, PaintContext, SceneBuilder, SizeConstraint, View,
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ViewContext,
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};
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pub struct Hook<V: View> {
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child: AnyElement<V>,
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after_layout: Option<Box<dyn FnMut(Vector2F, &mut ViewContext<V>)>>,
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}
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impl<V: View> Hook<V> {
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pub fn new(child: impl Element<V>) -> Self {
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Self {
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child: child.into_any(),
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after_layout: None,
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}
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}
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pub fn on_after_layout(
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mut self,
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f: impl 'static + FnMut(Vector2F, &mut ViewContext<V>),
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) -> Self {
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self.after_layout = Some(Box::new(f));
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self
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}
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}
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impl<V: View> Element<V> for Hook<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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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 size = self.child.layout(constraint, view, cx);
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if let Some(handler) = self.after_layout.as_mut() {
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handler(size, 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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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 PaintContext<V>,
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) {
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self.child
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.paint(scene, bounds.origin(), visible_bounds, view, cx);
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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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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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_: 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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) -> serde_json::Value {
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json!({
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"type": "Hooks",
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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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