try state nesting

package.json

@@ -42,6 +42,7 @@
     "electron-settings": "^4.0.2",
     "find-free-port": "^2.0.0",
     "isomorphic-ws": "^5.0.0",
+    "lodash.throttle": "^4.1.1",
     "lodash.debounce": "^4.0.8",
     "monaco-editor": "^0.39.0",
     "monaco-editor-webpack-plugin": "^7.1.0",
@@ -62,6 +63,7 @@
   "devDependencies": {
     "@electron-toolkit/tsconfig": "^1.0.1",
     "@electron/notarize": "^1.2.3",
+    "@types/lodash.throttle": "^4.1.8",
     "@types/lodash.debounce": "^4.0.8",
     "@types/node": "^18.16.16",
     "@types/react": "^18.2.8",

src/renderer/src/components/DiagramEditor.tsx

@@ -61,8 +61,7 @@ export const DiagramEditor: React.FC<DiagramEditorProps> = ({ manager, editor, s
       setNewTransition(undefined);
     };
 
-    //Перетаскиваем компонент в редактор
-    editor.container.on('stateDrop', (position) => {
+    editor.container.on('dblclick', (position) => {
       editor?.container.machineController.createState({
         name: 'Состояние',
         position,

src/renderer/src/lib/basic/Container.ts

@@ -1,4 +1,5 @@
 import { getColor } from '@renderer/theme';
+import { getCapturedNodeArgs } from '@renderer/types/drawable';
 import { Point } from '@renderer/types/graphics';
 import { MyMouseEvent } from '@renderer/types/mouse';
 
@@ -21,7 +22,7 @@ export const MIN_SCALE = 0.2;
  * управление камерой, обработка событий и сериализация.
  */
 interface ContainerEvents {
-  stateDrop: Point;
+  dblclick: Point;
   contextMenu: Point;
 }
 
@@ -107,8 +108,9 @@ export class Container extends EventEmitter<ContainerEvents> {
   }
 
   private initEvents() {
-    this.app.canvas.element.addEventListener('dragover', (e) => e.preventDefault());
-    this.app.canvas.element.addEventListener('drop', this.handleDrop);
+    // ! Это на будущее
+    // this.app.canvas.element.addEventListener('dragover', (e) => e.preventDefault());
+    // this.app.canvas.element.addEventListener('drop', this.handleDrop);
 
     this.app.keyboard.on('spacedown', this.handleSpaceDown);
     this.app.keyboard.on('spaceup', this.handleSpaceUp);
@@ -128,11 +130,15 @@ export class Container extends EventEmitter<ContainerEvents> {
     this.app.mouse.on('rightclick', this.handleRightMouseClick);
   }
 
-  private getCapturedNode(position: Point) {
-    const end = this.children.size - 1;
+  getCapturedNode(args: getCapturedNodeArgs) {
+    const { type } = args;
 
-    for (let i = end; i >= 0; i--) {
-      const node = this.children.getByIndex(i)?.getIntersection(position);
+    const end = type === 'states' ? this.children.statesSize : this.children.size;
+
+    for (let i = end - 1; i >= 0; i--) {
+      const node = (
+        type === 'states' ? this.children.getStateByIndex(i) : this.children.getByIndex(i)
+      )?.getIntersection(args);
 
       if (node) return node;
     }
@@ -148,24 +154,25 @@ export class Container extends EventEmitter<ContainerEvents> {
     this.isDirty = true;
   }
 
-  handleDrop = (e: DragEvent) => {
-    e.preventDefault();
+  // ! Это на будущее
+  // handleDrop = (e: DragEvent) => {
+  //   e.preventDefault();
 
-    const rect = this.app.canvas.element.getBoundingClientRect();
-    const scale = this.app.manager.data.scale;
-    const offset = this.app.manager.data.offset;
-    const position = {
-      x: (e.clientX - rect.left) * scale - offset.x,
-      y: (e.clientY - rect.top) * scale - offset.y,
-    };
+  //   const rect = this.app.canvas.element.getBoundingClientRect();
+  //   const scale = this.app.manager.data.scale;
+  //   const offset = this.app.manager.data.offset;
+  //   const position = {
+  //     x: (e.clientX - rect.left) * scale - offset.x,
+  //     y: (e.clientY - rect.top) * scale - offset.y,
+  //   };
 
-    this.emit('stateDrop', position);
-  };
+  //   this.emit('stateDrop', position);
+  // };
 
   handleMouseDown = (e: MyMouseEvent) => {
     if (!e.left || this.isPan) return;
 
-    const node = this.getCapturedNode(e);
+    const node = this.getCapturedNode({ position: e });
 
     if (node) {
       node.handleMouseDown(e);
@@ -189,7 +196,7 @@ export class Container extends EventEmitter<ContainerEvents> {
       return;
     }
 
-    const node = this.getCapturedNode(e);
+    const node = this.getCapturedNode({ position: e });
 
     if (node) {
       node.handleMouseUp(e);
@@ -200,7 +207,7 @@ export class Container extends EventEmitter<ContainerEvents> {
   };
 
   handleRightMouseClick = (e: MyMouseEvent) => {
-    const node = this.getCapturedNode(e);
+    const node = this.getCapturedNode({ position: e });
 
     if (node) {
       node.handleMouseContextMenu(e);
@@ -213,7 +220,7 @@ export class Container extends EventEmitter<ContainerEvents> {
     if (e.left) this.handleLeftMouseMove(e);
     if (e.right) this.handleRightMouseMove(e);
 
-    this.isDirty = true;
+    if (e.left || e.right) this.isDirty = true;
   };
 
   private handleLeftMouseMove(e: MyMouseEvent) {
@@ -238,12 +245,12 @@ export class Container extends EventEmitter<ContainerEvents> {
   }
 
   handleMouseDoubleClick = (e: MyMouseEvent) => {
-    const node = this.getCapturedNode(e);
+    const node = this.getCapturedNode({ position: e });
 
     if (node) {
       node.handleMouseDoubleClick(e);
     } else {
-      this.emit('stateDrop', this.relativeMousePos({ x: e.x, y: e.y }));
+      this.emit('dblclick', this.relativeMousePos({ x: e.x, y: e.y }));
     }
   };
 

src/renderer/src/lib/data/MachineController.ts

@@ -293,6 +293,7 @@ export class MachineController {
       }
     }
 
+    this.container.children.remove('state', child.id);
     child.parent = parent;
     parent.children.add('state', child.id);
     // TODO Сделать удобный проход по переходам состояния

src/renderer/src/lib/data/StatesController.ts

@@ -1,3 +1,5 @@
+import throttle from 'lodash.throttle';
+
 import { Point } from '@renderer/types/graphics';
 import { MyMouseEvent } from '@renderer/types/mouse';
 
@@ -7,6 +9,13 @@ import { EventSelection } from '../drawable/Events';
 import { InitialStateMark } from '../drawable/InitialStateMark';
 import { State } from '../drawable/State';
 
+type DragHandler = (state: State, e: { event: MyMouseEvent }) => void;
+
+type DragInfo = {
+  parentId: string;
+  childId: string;
+} | null;
+
 /**
  * Контроллер {@link State|состояний}.
  * Предоставляет подписку на события, связанные с состояниями.
@@ -22,6 +31,7 @@ interface StatesControllerEvents {
 }
 
 export class StatesController extends EventEmitter<StatesControllerEvents> {
+  dragInfo: DragInfo = null;
   initialStateMark: InitialStateMark | null = null;
 
   constructor(public container: Container) {
@@ -82,19 +92,39 @@ export class StatesController extends EventEmitter<StatesControllerEvents> {
     }
   };
 
-  handleLongPress = (state: State, e: { event: MyMouseEvent }) => {
-    // если состояние вложено – отсоединяем
-    if (typeof state.parent !== 'undefined') {
-      this.container.machineController.unlinkState({ id: state.id });
-      return;
-    }
+  // TODO: визуальная обратная связь
+  // если состояние вложено – отсоединяем
+  handleLongPress = (state: State) => {
+    if (typeof state.parent === 'undefined') return;
 
-    // если под курсором есть состояние – присоединить к нему
-    this.container.machineController.linkStateByPoint(state, e.event);
-    // TODO: визуальная обратная связь
+    this.container.machineController.unlinkState({ id: state.id });
   };
 
+  handleDrag: DragHandler = throttle<DragHandler>((state, e) => {
+    const possibleParent = (state.parent ?? this.container).getCapturedNode({
+      position: e.event,
+      exclude: [state.id],
+      includeChildrenHeight: false,
+      type: 'states',
+    });
+
+    this.dragInfo = null;
+
+    if (possibleParent) {
+      this.dragInfo = {
+        parentId: possibleParent.id,
+        childId: state.id,
+      };
+    }
+  }, 100);
+
   handleDragEnd = (state: State, e: { dragStartPosition: Point; dragEndPosition: Point }) => {
+    if (this.dragInfo) {
+      this.container.machineController.linkState(this.dragInfo.parentId, this.dragInfo.childId);
+      this.dragInfo = null;
+      return;
+    }
+
     this.container.machineController.changeStatePosition(
       state.id,
       e.dragStartPosition,
@@ -107,8 +137,9 @@ export class StatesController extends EventEmitter<StatesControllerEvents> {
     state.on('mouseup', this.handleMouseUpOnState.bind(this, state));
     state.on('dblclick', this.handleStateDoubleClick.bind(this, state));
     state.on('contextmenu', this.handleContextMenu.bind(this, state));
-    state.on('longpress', this.handleLongPress.bind(this, state));
+    state.on('drag', this.handleDrag.bind(this, state));
     state.on('dragend', this.handleDragEnd.bind(this, state));
+    state.on('longpress', this.handleLongPress.bind(this, state));
 
     state.edgeHandlers.onStartNewTransition = this.handleStartNewTransition;
   }
@@ -118,8 +149,9 @@ export class StatesController extends EventEmitter<StatesControllerEvents> {
     state.off('mouseup', this.handleMouseUpOnState.bind(this, state));
     state.off('dblclick', this.handleStateDoubleClick.bind(this, state));
     state.off('contextmenu', this.handleContextMenu.bind(this, state));
-    state.off('longpress', this.handleLongPress.bind(this, state));
+    state.off('drag', this.handleDrag.bind(this, state));
     state.off('dragend', this.handleDragEnd.bind(this, state));
+    state.off('longpress', this.handleLongPress.bind(this, state));
 
     state.edgeHandlers.unbindEvents();
   }

src/renderer/src/lib/drawable/Children.ts

@@ -25,6 +25,12 @@ export class Children {
     });
   }
 
+  forEachState(cb: (item: State) => void) {
+    this.statesList.forEach((id) => {
+      cb(this.stateMachine.states.get(id) as State);
+    });
+  }
+
   getTransitionIds() {
     return [...this.transitionsList];
   }
@@ -85,6 +91,12 @@ export class Children {
     }
   }
 
+  getStateByIndex(index: number) {
+    const id = this.statesList[index];
+
+    return this.stateMachine.states.get(id);
+  }
+
   getByIndex(index: number) {
     if (index < this.statesList.length) {
       const id = this.statesList[index];
@@ -112,4 +124,8 @@ export class Children {
   get isEmpty() {
     return this.size === 0;
   }
+
+  get statesSize() {
+    return this.statesList.length;
+  }
 }

src/renderer/src/lib/drawable/Node.ts

@@ -1,3 +1,4 @@
+import { getCapturedNodeArgs } from '@renderer/types/drawable';
 import { Point, Rectangle } from '@renderer/types/graphics';
 import { MyMouseEvent } from '@renderer/types/mouse';
 
@@ -30,6 +31,7 @@ interface NodeEvents {
   dblclick: { event: MyMouseEvent };
   contextmenu: { event: MyMouseEvent };
   longpress: { event: MyMouseEvent };
+  drag: { event: MyMouseEvent };
   dragend: { dragStartPosition: Point; dragEndPosition: Point };
 }
 
@@ -211,6 +213,8 @@ export abstract class Node extends EventEmitter<NodeEvents> {
         y: Math.max(0, this.bounds.y),
       };
     }
+
+    this.emit('drag', { event: e });
   };
 
   handleMouseUp = (e: MyMouseEvent) => {
@@ -233,25 +237,45 @@ export abstract class Node extends EventEmitter<NodeEvents> {
     this.emit('contextmenu', { event: e });
   };
 
-  isUnderMouse<T extends Point>({ x, y }: T, withChildren?: boolean) {
+  isUnderMouse({ x, y }: Point, includeChildrenHeight?: boolean) {
     const drawBounds = this.drawBounds;
-    const bounds = !withChildren
+    const bounds = !includeChildrenHeight
       ? drawBounds
       : { ...drawBounds, height: drawBounds.height + drawBounds.childrenHeight };
     return isPointInRectangle(bounds, { x, y });
   }
 
-  getIntersection(position: Point): Node | null {
-    const drawBounds = this.drawBounds;
+  getCapturedNode(args: getCapturedNodeArgs) {
+    const { type } = args;
+
+    const end = type === 'states' ? this.children.statesSize : this.children.size;
+
+    for (let i = end - 1; i >= 0; i--) {
+      const node = (
+        type === 'states' ? this.children.getStateByIndex(i) : this.children.getByIndex(i)
+      )?.getIntersection(args);
+
+      if (node) return node;
+    }
+
+    return null;
+  }
+
+  getIntersection(args: getCapturedNodeArgs): Node | null {
+    const { position, type, exclude, includeChildrenHeight } = args;
+
+    if (exclude?.includes(this.id)) return null;
 
-    if (isPointInRectangle(drawBounds, position)) {
+    if (this.isUnderMouse(position, includeChildrenHeight)) {
       return this;
     }
 
-    const end = this.children.size - 1;
+    const end = type === 'states' ? this.children.statesSize : this.children.size;
 
-    for (let i = end; i >= 0; i--) {
-      const node = this.children.getByIndex(i)?.getIntersection(position);
+    for (let i = end - 1; i >= 0; i--) {
+      const node = (
+        type === 'states' ? this.children.getStateByIndex(i) : this.children.getByIndex(i)
+      )?.getIntersection(args);
 
       if (node) return node;
     }