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Add a derive macro for Element

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To turn any struct into a composite element, you can implement a render method
with the following signature:

fn render<V: View>(&mut self, view: &mut V, cx: &mut ViewContext<V>) -> AnyElement<V>;

Then add #[derive(Element)] to the struct definition.

This will make it easier to introduce higher-level components that are expressed in
terms of other elements.
This commit is contained in:
Nathan Sobo 2023-06-25 07:51:50 -06:00
parent 82bd5fb564
commit bede668b14
3 changed files with 69 additions and 94 deletions
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92
crates/gpui/src/elements.rs
View file

@ -41,13 +41,7 @@ use collections::HashMap;
use core::panic;
use json::ToJson;
use smallvec::SmallVec;
use std::{
any::Any,
borrow::Cow,
marker::PhantomData,
mem,
ops::{Deref, DerefMut, Range},
};
use std::{any::Any, borrow::Cow, mem, ops::Range};
pub trait Element<V: View>: 'static {
type LayoutState;
@ -567,90 +561,6 @@ impl<V: View> RootElement<V> {
}
}
pub trait Component<V: View>: 'static {
fn render(&self, view: &mut V, cx: &mut ViewContext<V>) -> AnyElement<V>;
}
pub struct ComponentHost<V: View, C: Component<V>> {
component: C,
view_type: PhantomData<V>,
}
impl<V: View, C: Component<V>> ComponentHost<V, C> {
pub fn new(c: C) -> Self {
Self {
component: c,
view_type: PhantomData,
}
}
}
impl<V: View, C: Component<V>> Deref for ComponentHost<V, C> {
type Target = C;
fn deref(&self) -> &Self::Target {
&self.component
}
}
impl<V: View, C: Component<V>> DerefMut for ComponentHost<V, C> {
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.component
}
}
impl<V: View, C: Component<V>> Element<V> for ComponentHost<V, C> {
type LayoutState = AnyElement<V>;
type PaintState = ();
fn layout(
&mut self,
constraint: SizeConstraint,
view: &mut V,
cx: &mut LayoutContext<V>,
) -> (Vector2F, AnyElement<V>) {
let mut element = self.component.render(view, cx);
let size = element.layout(constraint, view, cx);
(size, element)
}
fn paint(
&mut self,
scene: &mut SceneBuilder,
bounds: RectF,
visible_bounds: RectF,
element: &mut AnyElement<V>,
view: &mut V,
cx: &mut ViewContext<V>,
) {
element.paint(scene, bounds.origin(), visible_bounds, view, cx);
}
fn rect_for_text_range(
&self,
range_utf16: Range<usize>,
_: RectF,
_: RectF,
element: &AnyElement<V>,
_: &(),
view: &V,
cx: &ViewContext<V>,
) -> Option<RectF> {
element.rect_for_text_range(range_utf16, view, cx)
}
fn debug(
&self,
_: RectF,
element: &AnyElement<V>,
_: &(),
view: &V,
cx: &ViewContext<V>,
) -> serde_json::Value {
element.debug(view, cx)
}
}
pub trait AnyRootElement {
fn layout(
&mut self,