Compiling checkpoint

crates/gpui/playground/src/div.rs

@@ -1,57 +1,180 @@
-use crate::style::StyleRefinement;
+use std::{marker::PhantomData, rc::Rc};
+
+use crate::element::{AnyElement, PaintContext};
+use crate::layout_context::LayoutContext;
+use crate::style::{Style, StyleRefinement};
+use anyhow::Result;
+use derive_more::{Deref, DerefMut};
+use gpui::EngineLayout;
+use gpui::{geometry::rect::RectF, platform::MouseMovedEvent, EventContext};
 use playground_macros::styleable_trait;
 use refineable::Refineable;
+use smallvec::SmallVec;
+use util::ResultExt;
 
-trait Element<V> {
-    type Style;
+type LayoutId = gpui::LayoutId;
 
-    fn hover(self) -> Hover<V, Self>
-    where
-        Self: Sized,
-        Self::Style: Refineable,
-        <Self::Style as Refineable>::Refinement: Default,
-    {
-        Hover {
-            child: self,
-            style: <<Self as Element<V>>::Style as Refineable>::Refinement::default(),
+#[derive(Deref, DerefMut)]
+pub struct Layout<V, E: Element<V>> {
+    id: LayoutId,
+    engine_layout: Option<EngineLayout>,
+    #[deref]
+    #[deref_mut]
+    element_data: E::Layout,
+}
+
+impl<V: 'static, E: Element<V>> Layout<V, E> {
+    pub fn new(id: LayoutId, engine_layout: Option<EngineLayout>, element_data: E::Layout) -> Self {
+        Self {
+            id,
+            engine_layout,
+            element_data,
         }
     }
+
+    pub fn bounds(&mut self, cx: &mut PaintContext<V>) -> RectF {
+        self.engine_layout(cx).bounds
+    }
+
+    fn engine_layout(&mut self, cx: &mut PaintContext<'_, '_, '_, '_, V>) -> &mut EngineLayout {
+        self.engine_layout
+            .get_or_insert_with(|| cx.computed_layout(self.id).log_err().unwrap_or_default())
+    }
+}
+
+pub trait Element<V> {
+    type Layout;
+
+    fn layout(&mut self, view: &mut V, cx: &mut LayoutContext<V>) -> Result<Layout<V, Self>>
+    where
+        Self: Sized;
+
+    fn paint(&mut self, view: &mut V, cx: &mut PaintContext<V>)
+    where
+        Self: Sized;
+
+    /// ## Helpers
+
+    fn hoverable(self) -> Hoverable<V, Self>
+    where
+        Self: Styleable + Sized,
+    {
+        hoverable(self)
+    }
 }
 
 use crate as playground;
 styleable_trait!();
 
-struct Hover<V, E: Element<V>>
-where
-    E::Style: Refineable,
-{
-    child: E,
-    style: <E::Style as Refineable>::Refinement,
-}
-
-struct Div {
+pub struct Div<V> {
     style: StyleRefinement,
+    children: SmallVec<[AnyElement<V>; 2]>,
 }
 
-impl Styleable for Div {
+impl<V> Styleable for Div<V> {
+    type Style = Style;
+
     fn declared_style(&mut self) -> &mut StyleRefinement {
         &mut self.style
     }
 }
 
-fn div() -> Div {
+pub fn div<V>() -> Div<V> {
     Div {
         style: Default::default(),
+        children: Default::default(),
     }
 }
 
-impl<V> Element<V> for Div {
-    type Style = StyleRefinement;
+impl<V: 'static> Element<V> for Div<V> {
+    type Layout = ();
+
+    fn layout(&mut self, view: &mut V, cx: &mut LayoutContext<V>) -> Result<Layout<V, Self>>
+    where
+        Self: Sized,
+    {
+        let children = self
+            .children
+            .iter_mut()
+            .map(|child| child.layout(view, cx))
+            .collect::<Result<Vec<LayoutId>>>()?;
+
+        cx.add_layout_node(self.style(), (), children)
+    }
+
+    fn paint(&mut self, view: &mut V, cx: &mut PaintContext<V>)
+    where
+        Self: Sized,
+    {
+        todo!()
+    }
+}
+
+pub struct Hoverable<V, E: Element<V> + Styleable> {
+    default_style: Style,
+    hovered_style: StyleRefinement,
+    child: E,
+    view_type: PhantomData<V>,
+}
+
+pub trait Interactive<V> {
+    fn declared_interactions(&mut self) -> &mut Interactions<V>;
+
+    fn on_mouse_move<H>(mut self, handler: H) -> Self
+    where
+        H: 'static + Fn(&mut V, &MouseMovedEvent, &mut EventContext<V>),
+        Self: Sized,
+    {
+        self.declared_interactions().mouse_moved = Some(Rc::new(move |view, event, cx| {
+            handler(view, event, cx);
+            cx.bubble
+        }));
+        self
+    }
+}
+
+pub struct Interactions<V> {
+    mouse_moved: Option<Rc<dyn Fn(&mut V, &MouseMovedEvent, &mut EventContext<V>) -> bool>>,
+}
+
+pub fn hoverable<V, E: Element<V> + Styleable>(mut child: E) -> Hoverable<V, E> {
+    Hoverable {
+        default_style: child.style(),
+        hovered_style: Default::default(),
+        child,
+        view_type: PhantomData,
+    }
+}
+
+impl<V, E: Element<V> + Styleable> Styleable for Hoverable<V, E> {
+    type Style = E::Style;
+
+    fn declared_style(&mut self) -> &mut playground::style::StyleRefinement {
+        self.child.declared_style()
+    }
+}
+
+impl<V, E: Element<V> + Styleable> Element<V> for Hoverable<V, E> {
+    type Layout = E::Layout;
+
+    fn layout(&mut self, view: &mut V, cx: &mut LayoutContext<V>) -> Result<Layout<V, Self>>
+    where
+        Self: Sized,
+    {
+        todo!()
+    }
+
+    fn paint(&mut self, view: &mut V, cx: &mut PaintContext<V>)
+    where
+        Self: Sized,
+    {
+        todo!()
+    }
 }
 
 #[test]
 fn test() {
-    let elt = div().w_auto();
+    // let elt = div().w_auto();
 }
 
 // trait Element<V: 'static> {