Move the repeater part that is specific to rust within the rust lib

api/sixtyfps-rs/lib.rs

@@ -66,13 +66,15 @@ fn main() {
 
 pub use sixtyfps_rs_macro::sixtyfps;
 
+pub(crate) mod repeater;
+
 /// internal re_exports used by the macro generated
 #[doc(hidden)]
 pub mod re_exports {
+    pub use crate::repeater::*;
     pub use const_field_offset::{self, FieldOffsets};
     pub use once_cell::sync::Lazy;
     pub use sixtyfps_corelib::abi::datastructures::*;
-    pub use sixtyfps_corelib::abi::model::*;
     pub use sixtyfps_corelib::abi::primitives::*;
     pub use sixtyfps_corelib::abi::properties::Property;
     pub use sixtyfps_corelib::abi::signals::Signal;

api/sixtyfps-rs/repeater.rs

@@ -0,0 +1,37 @@
+/// Component that can be instantiated by a repeater.
+pub trait RepeatedComponent: sixtyfps_corelib::abi::datastructures::Component {
+    /// The data corresponding to the model
+    type Data;
+
+    /// Update this component at the given index and the given data
+    fn update(&self, index: usize, data: &Self::Data);
+}
+
+/// This field is put in a component when using the `for` syntax
+/// It helps instantiating the components `C`
+#[derive(Default)]
+pub struct Repeater<C> {
+    components: Vec<Box<C>>,
+}
+
+impl<Data, C> Repeater<C>
+where
+    C: RepeatedComponent<Data = Data>,
+{
+    /// Called when the model is changed
+    pub fn update_model(&mut self, data: &[Data]) {
+        self.components.clear();
+        for (i, d) in data.iter().enumerate() {
+            let c = C::create();
+            c.update(i, d);
+            self.components.push(Box::new(c));
+        }
+    }
+
+    /// Call the visitor for each component
+    pub fn visit(&self, mut visitor: sixtyfps_corelib::abi::datastructures::ItemVisitorRefMut) {
+        for c in &self.components {
+            c.visit_children_item(-1, visitor.borrow_mut());
+        }
+    }
+}