feat(frontend): Improve added block positioning logic to handle colli…

…sions and dynamic dimensions size (#8406)

autogpt_platform/frontend/src/components/Flow.tsx

@@ -26,8 +26,12 @@ import {
 import "@xyflow/react/dist/style.css";
 import { CustomNode } from "./CustomNode";
 import "./flow.css";
-import { Link } from "@/lib/autogpt-server-api";
-import { getTypeColor, filterBlocksByType } from "@/lib/utils";
+import { BlockUIType, Link } from "@/lib/autogpt-server-api";
+import {
+  getTypeColor,
+  filterBlocksByType,
+  findNewlyAddedBlockCoordinates,
+} from "@/lib/utils";
 import { history } from "./history";
 import { CustomEdge } from "./CustomEdge";
 import ConnectionLine from "./ConnectionLine";
@@ -57,15 +61,30 @@ type FlowContextType = {
   getNextNodeId: () => string;
 };
 
+export type NodeDimension = {
+  [nodeId: string]: {
+    x: number;
+    y: number;
+    width: number;
+    height: number;
+  };
+};
+
 export const FlowContext = createContext<FlowContextType | null>(null);
 
 const FlowEditor: React.FC<{
   flowID?: string;
   template?: boolean;
   className?: string;
 }> = ({ flowID, template, className }) => {
-  const { addNodes, addEdges, getNode, deleteElements, updateNode } =
-    useReactFlow<CustomNode, CustomEdge>();
+  const {
+    addNodes,
+    addEdges,
+    getNode,
+    deleteElements,
+    updateNode,
+    setViewport,
+  } = useReactFlow<CustomNode, CustomEdge>();
   const [nodeId, setNodeId] = useState<number>(1);
   const [copiedNodes, setCopiedNodes] = useState<CustomNode[]>([]);
   const [copiedEdges, setCopiedEdges] = useState<CustomEdge[]>([]);
@@ -110,6 +129,9 @@ const FlowEditor: React.FC<{
 
   const TUTORIAL_STORAGE_KEY = "shepherd-tour";
 
+  // It stores the dimension of all nodes with position as well
+  const [nodeDimensions, setNodeDimensions] = useState<NodeDimension>({});
+
   useEffect(() => {
     if (params.get("resetTutorial") === "true") {
       localStorage.removeItem(TUTORIAL_STORAGE_KEY);
@@ -402,16 +424,36 @@ const FlowEditor: React.FC<{
         return;
       }
 
-      // Calculate the center of the viewport considering zoom
-      const viewportCenter = {
-        x: (window.innerWidth / 2 - x) / zoom,
-        y: (window.innerHeight / 2 - y) / zoom,
-      };
+      /*
+       Calculate a position to the right of the newly added block, allowing for some margin.
+       If adding to the right side causes the new block to collide with an existing block, attempt to place it at the bottom or left.
+       Why not the top? Because the height of the new block is unknown.
+       If it still collides, run a loop to find the best position where it does not collide.
+       Then, adjust the canvas to center on the newly added block.
+       Note: The width is known, e.g., w = 300px for a note and w = 500px for others, but the height is dynamic.
+       */
+
+      // Alternative: We could also use D3 force, Intersection for this (React flow Pro examples)
+
+      const viewportCoordinates =
+        nodeDimensions && Object.keys(nodeDimensions).length > 0
+          ? // we will get all the dimension of nodes, then store
+            findNewlyAddedBlockCoordinates(
+              nodeDimensions,
+              (nodeSchema.uiType == BlockUIType.NOTE ? 300 : 500) / zoom,
+              60 / zoom,
+              zoom,
+            )
+          : // we will get all the dimension of nodes, then store
+            {
+              x: (window.innerWidth / 2 - x) / zoom,
+              y: (window.innerHeight / 2 - y) / zoom,
+            };
 
       const newNode: CustomNode = {
         id: nodeId.toString(),
         type: "custom",
-        position: viewportCenter, // Set the position to the calculated viewport center
+        position: viewportCoordinates, // Set the position to the calculated viewport center
         data: {
           blockType: nodeType,
           blockCosts: nodeSchema.costs,
@@ -433,6 +475,15 @@ const FlowEditor: React.FC<{
       setNodeId((prevId) => prevId + 1);
       clearNodesStatusAndOutput(); // Clear status and output when a new node is added
 
+      setViewport(
+        {
+          x: -viewportCoordinates.x * zoom + window.innerWidth / 2,
+          y: -viewportCoordinates.y * zoom + window.innerHeight / 2 - 100,
+          zoom: 0.8,
+        },
+        { duration: 500 },
+      );
+
       history.push({
         type: "ADD_NODE",
         payload: { node: { ...newNode, ...newNode.data } },
@@ -442,8 +493,10 @@ const FlowEditor: React.FC<{
     },
     [
       nodeId,
+      setViewport,
       availableNodes,
       addNodes,
+      nodeDimensions,
       deleteElements,
       clearNodesStatusAndOutput,
       x,
@@ -452,6 +505,38 @@ const FlowEditor: React.FC<{
     ],
   );
 
+  const findNodeDimensions = useCallback(() => {
+    const newNodeDimensions: NodeDimension = nodes.reduce((acc, node) => {
+      const nodeElement = document.querySelector(
+        `[data-id="custom-node-${node.id}"]`,
+      );
+      if (nodeElement) {
+        const rect = nodeElement.getBoundingClientRect();
+        const { left, top, width, height } = rect;
+
+        // Convert screen coordinates to flow coordinates
+        const flowX = (left - x) / zoom;
+        const flowY = (top - y) / zoom;
+        const flowWidth = width / zoom;
+        const flowHeight = height / zoom;
+
+        acc[node.id] = {
+          x: flowX,
+          y: flowY,
+          width: flowWidth,
+          height: flowHeight,
+        };
+      }
+      return acc;
+    }, {} as NodeDimension);
+
+    setNodeDimensions(newNodeDimensions);
+  }, [nodes, x, y, zoom]);
+
+  useEffect(() => {
+    findNodeDimensions();
+  }, [nodes, findNodeDimensions]);
+
   const handleUndo = () => {
     history.undo();
   };

autogpt_platform/frontend/src/lib/utils.ts

@@ -1,6 +1,7 @@
 import { type ClassValue, clsx } from "clsx";
 import { twMerge } from "tailwind-merge";
 import { Category } from "./autogpt-server-api/types";
+import { NodeDimension } from "@/components/Flow";
 
 export function cn(...inputs: ClassValue[]) {
   return twMerge(clsx(inputs));
@@ -213,3 +214,78 @@ export function getBehaveAs(): BehaveAs {
     ? BehaveAs.CLOUD
     : BehaveAs.LOCAL;
 }
+
+function rectanglesOverlap(
+  rect1: { x: number; y: number; width: number; height?: number },
+  rect2: { x: number; y: number; width: number; height?: number },
+): boolean {
+  const x1 = rect1.x,
+    y1 = rect1.y,
+    w1 = rect1.width,
+    h1 = rect1.height ?? 100;
+  const x2 = rect2.x,
+    y2 = rect2.y,
+    w2 = rect2.width,
+    h2 = rect2.height ?? 100;
+
+  // Check if the rectangles do not overlap
+  return !(x1 + w1 <= x2 || x1 >= x2 + w2 || y1 + h1 <= y2 || y1 >= y2 + h2);
+}
+
+export function findNewlyAddedBlockCoordinates(
+  nodeDimensions: NodeDimension,
+  newWidth: number,
+  margin: number,
+  zoom: number,
+) {
+  const nodeDimensionArray = Object.values(nodeDimensions);
+
+  for (let i = nodeDimensionArray.length - 1; i >= 0; i--) {
+    const lastNode = nodeDimensionArray[i];
+    const lastNodeHeight = lastNode.height ?? 100;
+
+    // Right of the last node
+    let newX = lastNode.x + lastNode.width + margin;
+    let newY = lastNode.y;
+    let newRect = { x: newX, y: newY, width: newWidth, height: 100 / zoom };
+
+    const collisionRight = nodeDimensionArray.some((node) =>
+      rectanglesOverlap(newRect, node),
+    );
+
+    if (!collisionRight) {
+      return { x: newX, y: newY };
+    }
+
+    // Left of the last node
+    newX = lastNode.x - newWidth - margin;
+    newRect = { x: newX, y: newY, width: newWidth, height: 100 / zoom };
+
+    const collisionLeft = nodeDimensionArray.some((node) =>
+      rectanglesOverlap(newRect, node),
+    );
+
+    if (!collisionLeft) {
+      return { x: newX, y: newY };
+    }
+
+    // Below the last node
+    newX = lastNode.x;
+    newY = lastNode.y + lastNodeHeight + margin;
+    newRect = { x: newX, y: newY, width: newWidth, height: 100 / zoom };
+
+    const collisionBelow = nodeDimensionArray.some((node) =>
+      rectanglesOverlap(newRect, node),
+    );
+
+    if (!collisionBelow) {
+      return { x: newX, y: newY };
+    }
+  }
+
+  // Default position if no space is found
+  return {
+    x: 0,
+    y: 0,
+  };
+}