@foblex/drag-toolkit
Version:
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
162 lines • 27 kB
JavaScript
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"]}