Attempt to migrate to a class for handling renders.

It didn't work.

blog/2024-11-15-playing-with-fire/src/Canvas.tsx

@@ -10,6 +10,56 @@ function invertImage(sourceImage: ImageData): ImageData {
     return image;
 }
 
+class RenderManager {
+    private isFinished: boolean = false;
+    private painter: Iterator<ImageData> = null;
+    constructor(private readonly setImage: (image: [ImageData]) => void) {
+        requestAnimationFrame(() => this.animate());
+    }
+
+    setPainter(painter: Iterator<ImageData>) {
+        console.log("Received next painter");
+        if (!this) {
+            console.log(this);
+            return;
+        }
+        this.painter = painter;
+    }
+
+    setFinished() {
+        console.log("Received finished");
+        if (!this) {
+            console.log(this);
+            return;
+        }
+        this.isFinished = true;
+    }
+
+    animate() {
+        console.log("Received next frame");
+        if (!this) {
+            console.log(this);
+            return;
+        }
+
+        if (this.isFinished) {
+            return;
+        }
+
+        if (!this.painter) {
+            requestAnimationFrame(() => this.animate());
+        }
+
+        const nextImage = this.painter.next().value;
+        if (nextImage) {
+            console.log("Received next image");
+            this.setImage([nextImage]);
+        }
+
+        requestAnimationFrame(() => this.animate());
+    }
+}
+
 type InvertibleCanvasProps = {
     width: number,
     height: number,
@@ -104,28 +154,10 @@ interface CanvasProps {
  */
 export default function Canvas({width, height, children}: CanvasProps) {
     const [image, setImage] = useState<[ImageData]>(null);
-    const [painterHolder, setPainterHolder] = useState<[Iterator<ImageData>]>(null);
-    useEffect(() => {
-        if (!painterHolder) {
-            return;
-        }
+    const [renderManager, _setRenderManager] = useState<RenderManager>(new RenderManager(setImage));
+    const setPainter = (painter: Iterator<ImageData>) => renderManager.setPainter.bind(renderManager)(painter);
 
-        const painter = painterHolder[0];
-        const nextImage = painter.next().value;
-        if (nextImage) {
-            setImage([nextImage]);
-            setPainterHolder([painter]);
-        } else {
-            setPainterHolder(null);
-        }
-    }, [painterHolder]);
-
-    const [painter, setPainter] = useState<Iterator<ImageData>>(null);
-    useEffect(() => {
-        if (painter) {
-            setPainterHolder([painter]);
-        }
-    }, [painter]);
+    useEffect(() => () => { renderManager.setFinished.bind(renderManager)(); }, []);
 
     width = width ?? 500;
     height = height ?? 500;