Merge pull request #96 from Hexastack/47-request-visual-editor-allow-to-link-a-block-to-itself

Feat: Self Attached Node

frontend/src/components/visual-editor/hooks/useVisualEditor.tsx

@@ -8,10 +8,7 @@
  */
 
 import { debounce } from "@mui/material";
-import createEngine, {
+import createEngine, { DiagramModel } from "@projectstorm/react-diagrams";
-  DefaultLinkModel,
-  DiagramModel,
-} from "@projectstorm/react-diagrams";
 import * as React from "react";
 import { createContext, useContext } from "react";
 
@@ -26,6 +23,8 @@ import {
 } from "@/types/visual-editor.types";
 
 import { ZOOM_LEVEL } from "../constants";
+import { AdvancedLinkFactory } from "../v2/AdvancedLink/AdvancedLinkFactory";
+import { AdvancedLinkModel } from "../v2/AdvancedLink/AdvancedLinkModel";
 import { CustomCanvasWidget } from "../v2/CustomCanvasWidget";
 import { CustomDeleteItemsAction } from "../v2/CustomDiagramNodes/CustomDeleteAction";
 import { NodeFactory } from "../v2/CustomDiagramNodes/NodeFactory";
@@ -87,6 +86,8 @@ const buildDiagram = ({
   model = new DiagramModel();
 
   engine.getNodeFactories().registerFactory(new NodeFactory());
+  engine.getLinkFactories().registerFactory(new AdvancedLinkFactory());
+
   engine
     .getActionEventBus()
     .registerAction(new CustomDeleteItemsAction({ callback: onRemoveNode }));
@@ -139,12 +140,12 @@ const buildDiagram = ({
         }
       }
     };
-    const links: DefaultLinkModel[] = [];
+    const links: AdvancedLinkModel[] = [];
 
     data.forEach((datum, index) => {
       if ("nextBlocks" in datum && Array.isArray(datum.nextBlocks)) {
         datum.nextBlocks?.forEach((nextBlock) => {
-          const link = new DefaultLinkModel();
+          const link = new AdvancedLinkModel();
           const sourceNode = nodes[index];
           const targetNode = nodes.find(
             // @ts-ignore
@@ -164,7 +165,7 @@ const buildDiagram = ({
 
       //recursive link
       if ("attachedBlock" in datum && datum.attachedBlock) {
-        const link = new DefaultLinkModel({
+        const link = new AdvancedLinkModel({
           color: "#019185",
           selectedColor: "#019185",
           type: "default",

frontend/src/components/visual-editor/v2/AdvancedLink/AdvancedLinkFactory.tsx

@@ -0,0 +1,95 @@
+import { css, keyframes } from "@emotion/react";
+import styled from "@emotion/styled";
+import {
+  DefaultLinkFactory,
+  DefaultLinkWidget,
+} from "@projectstorm/react-diagrams";
+import React from "react";
+
+import { AdvancedLinkModel } from "./AdvancedLinkModel";
+
+interface Point {
+  x: number;
+  y: number;
+}
+
+const createCurvedPath = (start: Point, end: Point) => {
+  const controlPoint1X = start.x + 220;
+  const controlPoint1Y = start.y - 250;
+  const controlPoint2X = end.x - 250;
+  const controlPoint2Y = end.y - 250;
+
+  return `M ${start.x},${start.y} C ${controlPoint1X},${controlPoint1Y} ${controlPoint2X},${controlPoint2Y} ${end.x},${end.y}`;
+};
+
+namespace S {
+  export const Keyframes = keyframes`
+		from {
+			stroke-dashoffset: 24;
+		}
+		to {
+			stroke-dashoffset: 0;
+		}
+	`;
+
+  const selected = css`
+    stroke-dasharray: 10, 2;
+    animation: ${Keyframes} 1s linear infinite;
+  `;
+
+  export const Path = styled.path<{ selected: boolean }>`
+    ${(p) => p.selected && selected};
+    fill: none;
+    pointer-events: auto;
+  `;
+}
+
+export class AdvancedLinkFactory extends DefaultLinkFactory {
+  constructor() {
+    super("advanced");
+  }
+
+  generateModel(): AdvancedLinkModel {
+    return new AdvancedLinkModel();
+  }
+
+  generateReactWidget(event): JSX.Element {
+    return <DefaultLinkWidget link={event.model} diagramEngine={this.engine} />;
+  }
+
+  generateLinkSegment(
+    model: AdvancedLinkModel,
+    selected: boolean,
+    path: string,
+  ) {
+    const isSelfLoop =
+      model.getSourcePort().getNode() === model.getTargetPort().getNode();
+
+    if (isSelfLoop) {
+      // Adjust the path to create a curve
+      const sourcePortPosition = model.getSourcePort().getPosition();
+      const targetPortPosition = model.getTargetPort().getPosition();
+      const startPoint: Point = {
+        x: sourcePortPosition.x + 20,
+        y: sourcePortPosition.y + 20,
+      };
+      const endPoint: Point = {
+        x: targetPortPosition.x + 20,
+        y: targetPortPosition.y + 20,
+      };
+
+      path = createCurvedPath(startPoint, endPoint);
+    }
+
+    return (
+      <S.Path
+        selected={selected}
+        stroke={
+          selected ? model.getOptions().selectedColor : model.getOptions().color
+        }
+        strokeWidth={model.getOptions().width}
+        d={path}
+      />
+    );
+  }
+}

frontend/src/components/visual-editor/v2/AdvancedLink/AdvancedLinkModel.tsx

@@ -0,0 +1,13 @@
+import {
+  DefaultLinkModel,
+  DefaultLinkModelOptions,
+} from "@projectstorm/react-diagrams";
+
+export class AdvancedLinkModel extends DefaultLinkModel {
+  constructor(options?: DefaultLinkModelOptions) {
+    super({
+      ...options,
+      type: "advanced",
+    });
+  }
+}

frontend/src/components/visual-editor/v2/Diagrams.tsx

@@ -25,7 +25,6 @@ import {
   tabsClasses,
 } from "@mui/material";
 import {
-  DefaultLinkModel,
   DefaultPortModel,
   DiagramEngine,
   DiagramModel,
@@ -54,6 +53,7 @@ import { IBlock } from "@/types/block.types";
 import { ICategory } from "@/types/category.types";
 import { BlockPorts } from "@/types/visual-editor.types";
 
+import { AdvancedLinkModel } from "./AdvancedLink/AdvancedLinkModel";
 import BlockDialog from "../BlockDialog";
 import { ZOOM_LEVEL } from "../constants";
 import { useVisualEditor } from "../hooks/useVisualEditor";
@@ -195,7 +195,7 @@ const Diagrams = () => {
         entity,
         port,
       }: {
-        entity: DefaultLinkModel;
+        entity: AdvancedLinkModel;
         port: DefaultPortModel;
       }) => {
         const link = model.getLink(entity.getOptions().id as string);
@@ -205,7 +205,10 @@ const Diagrams = () => {
           [BlockPorts.nextBlocksOutPort, BlockPorts.attachmentOutPort].includes(
             // @ts-expect-error protected attr
             entity.targetPort.getOptions().label,
-          )
+          ) ||
+          (link.getSourcePort().getType() === "attached" &&
+            link.getSourcePort().getParent().getOptions().id ===
+              link.getTargetPort().getParent().getOptions().id)
         ) {
           model.removeLink(link);