141 lines
3.5 KiB
Rust
141 lines
3.5 KiB
Rust
use pathfinder_geometry::{rect::RectF, vector::Vector2F};
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use crate::{
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AnyElement, Element, LayoutContext, PaintContext, SceneBuilder, SizeConstraint, View,
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ViewContext,
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};
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use super::Empty;
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pub trait GeneralComponent {
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fn render<V: View>(self, v: &mut V, cx: &mut ViewContext<V>) -> AnyElement<V>;
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}
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pub trait StyleableComponent {
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type Style: Clone;
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type Output: GeneralComponent;
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fn with_style(self, style: Self::Style) -> Self::Output;
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}
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impl GeneralComponent for () {
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fn render<V: View>(self, _: &mut V, _: &mut ViewContext<V>) -> AnyElement<V> {
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Empty::new().into_any()
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}
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}
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impl StyleableComponent for () {
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type Style = ();
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type Output = ();
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fn with_style(self, _: Self::Style) -> Self::Output {
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()
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}
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}
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pub trait Component<V: View> {
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fn render(self, v: &mut V, cx: &mut ViewContext<V>) -> AnyElement<V>;
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fn into_element(self) -> ComponentAdapter<V, Self>
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where
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Self: Sized,
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{
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ComponentAdapter::new(self)
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}
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}
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impl<V: View, C: GeneralComponent> Component<V> for C {
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fn render(self, v: &mut V, cx: &mut ViewContext<V>) -> AnyElement<V> {
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self.render(v, cx)
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}
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}
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pub struct ComponentAdapter<V: View, E> {
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component: Option<E>,
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element: Option<AnyElement<V>>,
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#[cfg(debug_assertions)]
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_component_name: &'static str,
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}
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impl<E, V: View> ComponentAdapter<V, E> {
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pub fn new(e: E) -> Self {
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Self {
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component: Some(e),
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element: None,
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#[cfg(debug_assertions)]
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_component_name: std::any::type_name::<E>(),
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}
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}
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}
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impl<V: View, C: Component<V> + 'static> Element<V> for ComponentAdapter<V, C> {
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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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if self.element.is_none() {
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let component = self.component.take().unwrap();
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self.element = Some(component.render(view, cx.view_context()));
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}
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let constraint = self.element.as_mut().unwrap().layout(constraint, view, cx);
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(constraint, ())
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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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) -> Self::PaintState {
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self.element
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.as_mut()
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.unwrap()
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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: 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.element
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.as_ref()
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.unwrap()
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.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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#[cfg(debug_assertions)]
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let component_name = self._component_name;
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#[cfg(not(debug_assertions))]
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let component_name = "Unknown";
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serde_json::json!({
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"type": "ComponentAdapter",
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"child": self.element.as_ref().unwrap().debug(view, cx),
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"component_name": component_name
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})
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}
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}
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