Joscha
638a449343
Constructor functions that set/overwrite a value are called with_*, functions that add a value are called and_*.
53 lines
1.2 KiB
Rust
53 lines
1.2 KiB
Rust
use taffy::{AvailableSpace, Layout, Size};
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use crate::{Node, View};
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pub trait Widget<C> {
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/// Used for the measure function in
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/// [`taffy::TaffyTree::compute_layout_with_measure`].
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#[allow(unused_variables)]
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fn size(
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&mut self,
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ctx: &mut C,
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known: Size<Option<f32>>,
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available: Size<AvailableSpace>,
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) -> Size<f32> {
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Size::ZERO
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}
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/// Called before all children are drawn.
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///
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/// Prefer this over [`Self::draw_above`] when implementing a leaf widget.
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#[allow(unused_variables)]
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fn draw_below(
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&mut self,
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ctx: &mut C,
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view: &mut View<'_>,
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layout: &Layout,
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) -> anyhow::Result<()> {
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Ok(())
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}
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/// Called after all children are drawn.
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#[allow(unused_variables)]
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fn draw_above(
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&mut self,
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ctx: &mut C,
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view: &mut View<'_>,
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layout: &Layout,
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) -> anyhow::Result<()> {
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Ok(())
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}
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}
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pub type BoxedWidget<C> = Box<dyn Widget<C>>;
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pub trait WidgetExt<C> {
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fn node(self) -> Node<C>;
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}
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impl<C, W: Widget<C> + 'static> WidgetExt<C> for W {
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fn node(self) -> Node<C> {
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Node::empty().with_widget(self)
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}
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}
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