🎉 Save shape data in rust memory

render-wasm/src/state.rs

@@ -0,0 +1,36 @@
+use skia_safe as skia;
+use std::collections::HashMap;
+use std::vec::Vec;
+use uuid::Uuid;
+
+use crate::render::RenderState;
+use crate::shapes::Shape;
+
+/// This struct holds the state of the Rust application between JS calls.
+///
+/// It is created by [init] and passed to the other exported functions.
+/// Note that rust-skia data structures are not thread safe, so a state
+/// must not be shared between different Web Workers.
+pub(crate) struct State<'a> {
+    pub render_state: RenderState,
+    pub current_id: Option<Uuid>,
+    pub current_shape: Option<&'a mut Shape>,
+    pub shapes: HashMap<Uuid, Shape>,
+    pub display_list: Vec<Uuid>,
+}
+
+impl<'a> State<'a> {
+    pub fn with_capacity(width: i32, height: i32, capacity: usize) -> Self {
+        State {
+            render_state: RenderState::new(width, height),
+            current_id: None,
+            current_shape: None,
+            shapes: HashMap::with_capacity(capacity),
+            display_list: Vec::with_capacity(capacity),
+        }
+    }
+
+    pub fn set_surface(&mut self, surface: skia::Surface) {
+        self.render_state.surface = surface;
+    }
+}