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@foblex/drag-toolkit

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A TypeScript library providing foundational classes and utilities for implementing drag-and-drop functionality in Angular applications, with support for both mouse and touch events, and designed to work with or without Angular’s NgZone (zoneless applicati

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import { IMouseEvent, ITouchDownEvent, ITouchMoveEvent } from './pointer-events'; import { EventExtensions } from './event.extensions'; import { IPointerUpEvent } from './pointer-events/i-pointer-up-event'; export const MOUSE_EVENT_IGNORE_TIME = 800; export class DragAndDropBase { constructor(ngZone) { this.ngZone = ngZone; this.mouseListeners = EventExtensions.emptyListener(); this.touchListeners = EventExtensions.emptyListener(); this.startListeners = EventExtensions.emptyListener(); this.lastTouchEventTime = 0; this.isDragStarted = false; this.dragStartThreshold = 3; this.dragStartDelay = 0; this.dragStartTime = 0; this.dragStartPosition = { x: 0, y: 0 }; this.moveHandler = this.checkDragSequenceToStart; this.pointerDownElement = null; this.onMouseDown = (event) => { var _a; const isSyntheticEvent = this.isSyntheticEvent(event); const isFakeEvent = isFakeMousedownFromScreenReader(event); const mouseEvent = new IMouseEvent(event); this.pointerDownElement = mouseEvent.targetElement; if (isSyntheticEvent || isFakeEvent || this.disabled) { return; } let result = this.onPointerDown(mouseEvent); if (result) { this.dragStartTime = Date.now(); this.dragStartPosition = mouseEvent.getPosition(); (_a = this.ngZone) === null || _a === void 0 ? void 0 : _a.runOutsideAngular(() => { var _a, _b, _c; (_a = this.document) === null || _a === void 0 ? void 0 : _a.addEventListener('selectstart', this.onSelectStart, EventExtensions.activeListener()); (_b = this.document) === null || _b === void 0 ? void 0 : _b.addEventListener('mousemove', this.onMouseMove); (_c = this.document) === null || _c === void 0 ? void 0 : _c.addEventListener('pointerup', this.onPointerUpEvent); }); this.mouseListeners = () => { var _a, _b, _c; (_a = this.document) === null || _a === void 0 ? void 0 : _a.removeEventListener('selectstart', this.onSelectStart, EventExtensions.activeListener()); (_b = this.document) === null || _b === void 0 ? void 0 : _b.removeEventListener('mousemove', this.onMouseMove); (_c = this.document) === null || _c === void 0 ? void 0 : _c.removeEventListener('pointerup', this.onPointerUpEvent); }; } }; this.onTouchDown = (event) => { var _a; const isFakeEvent = isFakeTouchstartFromScreenReader(event); const touchEvent = new ITouchDownEvent(event); this.pointerDownElement = touchEvent.targetElement; if (isFakeEvent || this.disabled) { return; } let result = this.onPointerDown(touchEvent); if (result) { this.dragStartTime = Date.now(); this.dragStartPosition = touchEvent.getPosition(); (_a = this.ngZone) === null || _a === void 0 ? void 0 : _a.runOutsideAngular(() => { var _a, _b, _c; (_a = this.document) === null || _a === void 0 ? void 0 : _a.addEventListener('selectstart', this.onSelectStart, EventExtensions.activeListener()); (_b = this.document) === null || _b === void 0 ? void 0 : _b.addEventListener('touchmove', this.onTouchMove); (_c = this.document) === null || _c === void 0 ? void 0 : _c.addEventListener('pointerup', this.onPointerUpEvent); }); this.touchListeners = () => { var _a, _b, _c; (_a = this.document) === null || _a === void 0 ? void 0 : _a.removeEventListener('selectstart', this.onSelectStart, EventExtensions.activeListener()); (_b = this.document) === null || _b === void 0 ? void 0 : _b.removeEventListener('touchmove', this.onTouchMove); (_c = this.document) === null || _c === void 0 ? void 0 : _c.removeEventListener('pointerup', this.onPointerUpEvent); }; } }; this.onSelectStart = (event) => { this.onSelect(event); }; this.onMouseMove = (event) => { this.moveHandler(new IMouseEvent(event)); }; this.onTouchMove = (event) => { this.moveHandler(new ITouchMoveEvent(event)); }; this.onPointerUpEvent = (event) => { if (this.isDragStarted) { this.onPointerUp(new IPointerUpEvent(event)); } this.endDragSequence(); }; } isSyntheticEvent(event) { return !!this.lastTouchEventTime && (this.lastTouchEventTime + MOUSE_EVENT_IGNORE_TIME > Date.now()); } checkDragSequenceToStart(event) { const pointerPosition = event.getPosition(); if (!this.isDragStarted && this.pointerDownElement) { event.setTarget(this.pointerDownElement); const distanceX = Math.abs(pointerPosition.x - this.dragStartPosition.x); const distanceY = Math.abs(pointerPosition.y - this.dragStartPosition.y); const isOverThreshold = distanceX + distanceY >= this.dragStartThreshold; if (isOverThreshold) { const isDelayElapsed = Date.now() >= this.dragStartTime + this.dragStartDelay; if (!isDelayElapsed) { this.endDragSequence(); return; } event.preventDefault(); this.prepareDragSequence(event); this.isDragStarted = true; this.moveHandler = this.onPointerMove; if (isTouchEvent(event.originalEvent)) { this.lastTouchEventTime = Date.now(); } } } } endDragSequence() { this.isDragStarted = false; this.pointerDownElement = null; this.moveHandler = this.checkDragSequenceToStart; this.mouseListeners(); this.mouseListeners = EventExtensions.emptyListener(); this.touchListeners(); this.touchListeners = EventExtensions.emptyListener(); this.finalizeDragSequence(); } subscribe(fDocument) { var _a; if (this.document) { this.unsubscribe(); } this.document = fDocument; (_a = this.ngZone) === null || _a === void 0 ? void 0 : _a.runOutsideAngular(() => { fDocument.addEventListener('mousedown', this.onMouseDown, EventExtensions.activeListener()); fDocument.addEventListener('touchstart', this.onTouchDown, EventExtensions.passiveListener()); }); this.startListeners = () => { fDocument.removeEventListener('mousedown', this.onMouseDown, EventExtensions.activeListener()); fDocument.removeEventListener('touchstart', this.onTouchDown, EventExtensions.passiveListener()); }; } unsubscribe() { this.startListeners(); this.startListeners = EventExtensions.emptyListener(); this.touchListeners(); this.touchListeners = EventExtensions.emptyListener(); this.mouseListeners(); this.mouseListeners = EventExtensions.emptyListener(); } } function isTouchEvent(event) { return event.type[0] === 't'; } function isFakeMousedownFromScreenReader(event) { return event.buttons === 0 || (event.offsetX === 0 && event.offsetY === 0); } function isFakeTouchstartFromScreenReader(event) { const touch = (event.touches && event.touches[0]) || (event.changedTouches && event.changedTouches[0]); return (!!touch && touch.identifier === -1 && (touch.radiusX == null || touch.radiusX === 1) && (touch.radiusY == null || touch.radiusY === 1)); } //# 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{ ICanRunOutsideAngular } from './i-can-run-outside-angular';\nimport { IMouseEvent, IPointerEvent, ITouchDownEvent, ITouchMoveEvent, ITouchUpEvent } from './pointer-events';\nimport { EventExtensions } from './event.extensions';\nimport { IPointerUpEvent } from './pointer-events/i-pointer-up-event';\n\nexport const MOUSE_EVENT_IGNORE_TIME = 800;\n\nexport abstract class DragAndDropBase {\n\n  public abstract hostElement: HTMLElement;\n\n  private document: Document | undefined;\n\n  private mouseListeners: Function = EventExtensions.emptyListener();\n  private touchListeners: Function = EventExtensions.emptyListener();\n\n  private startListeners: Function = EventExtensions.emptyListener();\n\n  public isSyntheticEvent(event: MouseEvent): boolean {\n    return !!this.lastTouchEventTime &&\n      (this.lastTouchEventTime + MOUSE_EVENT_IGNORE_TIME > Date.now());\n  }\n\n  private lastTouchEventTime: number = 0;\n\n  public isDragStarted: boolean = false;\n  private dragStartThreshold: number = 3;\n  private dragStartDelay: number = 0;\n\n  private dragStartTime: number = 0;\n  private dragStartPosition: { x: number, y: number } = { x: 0, y: 0 };\n\n  public abstract disabled: boolean;\n\n  private moveHandler: Function = this.checkDragSequenceToStart;\n\n  private pointerDownElement: HTMLElement | null = null;\n\n  protected constructor(\n    protected ngZone: ICanRunOutsideAngular | undefined\n  ) {\n  }\n\n  private onMouseDown = (event: MouseEvent) => {\n    const isSyntheticEvent = this.isSyntheticEvent(event);\n    const isFakeEvent = isFakeMousedownFromScreenReader(event);\n    const mouseEvent = new IMouseEvent(event);\n    this.pointerDownElement = mouseEvent.targetElement;\n\n    if (isSyntheticEvent || isFakeEvent || this.disabled) {\n      return;\n    }\n    let result = this.onPointerDown(mouseEvent);\n    if (result) {\n\n      this.dragStartTime = Date.now();\n      this.dragStartPosition = mouseEvent.getPosition();\n\n      this.ngZone?.runOutsideAngular(() => {\n        this.document?.addEventListener('selectstart', this.onSelectStart, EventExtensions.activeListener());\n        this.document?.addEventListener('mousemove', this.onMouseMove);\n        this.document?.addEventListener('pointerup', this.onPointerUpEvent);\n      });\n\n      this.mouseListeners = () => {\n        this.document?.removeEventListener('selectstart', this.onSelectStart, EventExtensions.activeListener());\n        this.document?.removeEventListener('mousemove', this.onMouseMove);\n        this.document?.removeEventListener('pointerup', this.onPointerUpEvent);\n      };\n    }\n  }\n\n  private onTouchDown = (event: TouchEvent) => {\n    const isFakeEvent = isFakeTouchstartFromScreenReader(event as TouchEvent)\n    const touchEvent = new ITouchDownEvent(event);\n    this.pointerDownElement = touchEvent.targetElement;\n\n    if (isFakeEvent || this.disabled) {\n      return;\n    }\n    let result = this.onPointerDown(touchEvent);\n    if (result) {\n\n      this.dragStartTime = Date.now();\n      this.dragStartPosition = touchEvent.getPosition();\n\n      this.ngZone?.runOutsideAngular(() => {\n        this.document?.addEventListener('selectstart', this.onSelectStart, EventExtensions.activeListener());\n        this.document?.addEventListener('touchmove', this.onTouchMove);\n        this.document?.addEventListener('pointerup', this.onPointerUpEvent);\n      });\n\n      this.touchListeners = () => {\n        this.document?.removeEventListener('selectstart', this.onSelectStart, EventExtensions.activeListener());\n        this.document?.removeEventListener('touchmove', this.onTouchMove);\n        this.document?.removeEventListener('pointerup', this.onPointerUpEvent);\n      };\n    }\n  }\n\n  private onSelectStart = (event: Event) => {\n    this.onSelect(event);\n  }\n\n  private onMouseMove = (event: MouseEvent) => {\n    this.moveHandler(new IMouseEvent(event));\n  }\n\n  private onTouchMove = (event: TouchEvent) => {\n    this.moveHandler(new ITouchMoveEvent(event));\n  }\n\n  private checkDragSequenceToStart(event: IPointerEvent): void {\n    const pointerPosition = event.getPosition();\n\n    if (!this.isDragStarted && this.pointerDownElement) {\n      event.setTarget(this.pointerDownElement);\n      const distanceX = Math.abs(pointerPosition.x - this.dragStartPosition.x);\n      const distanceY = Math.abs(pointerPosition.y - this.dragStartPosition.y);\n      const isOverThreshold = distanceX + distanceY >= this.dragStartThreshold;\n\n      if (isOverThreshold) {\n        const isDelayElapsed = Date.now() >= this.dragStartTime + this.dragStartDelay;\n\n        if (!isDelayElapsed) {\n          this.endDragSequence();\n          return;\n        }\n\n        event.preventDefault();\n        this.prepareDragSequence(event);\n        this.isDragStarted = true;\n        this.moveHandler = this.onPointerMove;\n        if (isTouchEvent(event.originalEvent)) {\n          this.lastTouchEventTime = Date.now();\n        }\n      }\n    }\n  }\n\n  protected abstract prepareDragSequence(event: IPointerEvent): void;\n\n  private onPointerUpEvent = (event: PointerEvent) => {\n    if (this.isDragStarted) {\n      this.onPointerUp(new IPointerUpEvent(event));\n    }\n    this.endDragSequence();\n  }\n\n  private endDragSequence(): void {\n    this.isDragStarted = false;\n    this.pointerDownElement = null;\n\n    this.moveHandler = this.checkDragSequenceToStart;\n    this.mouseListeners();\n    this.mouseListeners = EventExtensions.emptyListener();\n    this.touchListeners();\n    this.touchListeners = EventExtensions.emptyListener();\n    this.finalizeDragSequence();\n  }\n\n  protected abstract finalizeDragSequence(): void;\n\n  protected abstract onSelect(event: Event): void;\n\n  public abstract onPointerDown(event: IPointerEvent): boolean;\n\n  public abstract onPointerMove(event: IPointerEvent): void;\n\n  public abstract onPointerUp(event: IPointerEvent): void;\n\n  public subscribe(fDocument: Document): void {\n    if (this.document) {\n      this.unsubscribe();\n    }\n    this.document = fDocument;\n\n    this.ngZone?.runOutsideAngular(() => {\n      fDocument.addEventListener('mousedown', this.onMouseDown, EventExtensions.activeListener());\n      fDocument.addEventListener('touchstart', this.onTouchDown, EventExtensions.passiveListener());\n    });\n\n    this.startListeners = () => {\n      fDocument.removeEventListener('mousedown', this.onMouseDown, EventExtensions.activeListener());\n      fDocument.removeEventListener('touchstart', this.onTouchDown, EventExtensions.passiveListener());\n    };\n  }\n\n  public unsubscribe(): void {\n\n    this.startListeners();\n    this.startListeners = EventExtensions.emptyListener();\n    this.touchListeners();\n    this.touchListeners = EventExtensions.emptyListener();\n    this.mouseListeners();\n    this.mouseListeners = EventExtensions.emptyListener();\n  }\n}\n\nfunction isTouchEvent(event: MouseEvent | TouchEvent): event is TouchEvent {\n  return event.type[ 0 ] === 't';\n}\n\nfunction isFakeMousedownFromScreenReader(event: MouseEvent): boolean {\n  return event.buttons === 0 || (event.offsetX === 0 && event.offsetY === 0);\n}\n\nfunction isFakeTouchstartFromScreenReader(event: TouchEvent): boolean {\n  const touch: Touch | undefined =\n    (event.touches && event.touches[ 0 ]) || (event.changedTouches && event.changedTouches[ 0 ]);\n  return (\n    !!touch &&\n    touch.identifier === -1 &&\n    (touch.radiusX == null || touch.radiusX === 1) &&\n    (touch.radiusY == null || touch.radiusY === 1)\n  );\n}\n"]}