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@angular/cdk

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Angular Material Component Development Kit

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/** * @license * Copyright Google LLC All Rights Reserved. * * Use of this source code is governed by an MIT-style license that can be * found in the LICENSE file at https://angular.io/license */ import { Injectable, NgZone, Inject } from '@angular/core'; import { DOCUMENT } from '@angular/common'; import { normalizePassiveListenerOptions } from '@angular/cdk/platform'; import { Subject } from 'rxjs'; import * as i0 from "@angular/core"; import * as i1 from "@angular/common"; /** Event options that can be used to bind an active, capturing event. */ const activeCapturingEventOptions = normalizePassiveListenerOptions({ passive: false, capture: true }); /** * Service that keeps track of all the drag item and drop container * instances, and manages global event listeners on the `document`. * @docs-private */ // Note: this class is generic, rather than referencing CdkDrag and CdkDropList directly, in order // to avoid circular imports. If we were to reference them here, importing the registry into the // classes that are registering themselves will introduce a circular import. export class DragDropRegistry { constructor(_ngZone, _document) { this._ngZone = _ngZone; /** Registered drop container instances. */ this._dropInstances = new Set(); /** Registered drag item instances. */ this._dragInstances = new Set(); /** Drag item instances that are currently being dragged. */ this._activeDragInstances = []; /** Keeps track of the event listeners that we've bound to the `document`. */ this._globalListeners = new Map(); /** * Predicate function to check if an item is being dragged. Moved out into a property, * because it'll be called a lot and we don't want to create a new function every time. */ this._draggingPredicate = (item) => item.isDragging(); /** * Emits the `touchmove` or `mousemove` events that are dispatched * while the user is dragging a drag item instance. */ this.pointerMove = new Subject(); /** * Emits the `touchend` or `mouseup` events that are dispatched * while the user is dragging a drag item instance. */ this.pointerUp = new Subject(); /** Emits when the viewport has been scrolled while the user is dragging an item. */ this.scroll = new Subject(); /** * Event listener that will prevent the default browser action while the user is dragging. * @param event Event whose default action should be prevented. */ this._preventDefaultWhileDragging = (event) => { if (this._activeDragInstances.length > 0) { event.preventDefault(); } }; /** Event listener for `touchmove` that is bound even if no dragging is happening. */ this._persistentTouchmoveListener = (event) => { if (this._activeDragInstances.length > 0) { // Note that we only want to prevent the default action after dragging has actually started. // Usually this is the same time at which the item is added to the `_activeDragInstances`, // but it could be pushed back if the user has set up a drag delay or threshold. if (this._activeDragInstances.some(this._draggingPredicate)) { event.preventDefault(); } this.pointerMove.next(event); } }; this._document = _document; } /** Adds a drop container to the registry. */ registerDropContainer(drop) { if (!this._dropInstances.has(drop)) { this._dropInstances.add(drop); } } /** Adds a drag item instance to the registry. */ registerDragItem(drag) { this._dragInstances.add(drag); // The `touchmove` event gets bound once, ahead of time, because WebKit // won't preventDefault on a dynamically-added `touchmove` listener. // See https://bugs.webkit.org/show_bug.cgi?id=184250. if (this._dragInstances.size === 1) { this._ngZone.runOutsideAngular(() => { // The event handler has to be explicitly active, // because newer browsers make it passive by default. this._document.addEventListener('touchmove', this._persistentTouchmoveListener, activeCapturingEventOptions); }); } } /** Removes a drop container from the registry. */ removeDropContainer(drop) { this._dropInstances.delete(drop); } /** Removes a drag item instance from the registry. */ removeDragItem(drag) { this._dragInstances.delete(drag); this.stopDragging(drag); if (this._dragInstances.size === 0) { this._document.removeEventListener('touchmove', this._persistentTouchmoveListener, activeCapturingEventOptions); } } /** * Starts the dragging sequence for a drag instance. * @param drag Drag instance which is being dragged. * @param event Event that initiated the dragging. */ startDragging(drag, event) { // Do not process the same drag twice to avoid memory leaks and redundant listeners if (this._activeDragInstances.indexOf(drag) > -1) { return; } this._activeDragInstances.push(drag); if (this._activeDragInstances.length === 1) { const isTouchEvent = event.type.startsWith('touch'); // We explicitly bind __active__ listeners here, because newer browsers will default to // passive ones for `mousemove` and `touchmove`. The events need to be active, because we // use `preventDefault` to prevent the page from scrolling while the user is dragging. this._globalListeners .set(isTouchEvent ? 'touchend' : 'mouseup', { handler: (e) => this.pointerUp.next(e), options: true }) .set('scroll', { handler: (e) => this.scroll.next(e), // Use capturing so that we pick up scroll changes in any scrollable nodes that aren't // the document. See https://github.com/angular/components/issues/17144. options: true }) // Preventing the default action on `mousemove` isn't enough to disable text selection // on Safari so we need to prevent the selection event as well. Alternatively this can // be done by setting `user-select: none` on the `body`, however it has causes a style // recalculation which can be expensive on pages with a lot of elements. .set('selectstart', { handler: this._preventDefaultWhileDragging, options: activeCapturingEventOptions }); // We don't have to bind a move event for touch drag sequences, because // we already have a persistent global one bound from `registerDragItem`. if (!isTouchEvent) { this._globalListeners.set('mousemove', { handler: (e) => this.pointerMove.next(e), options: activeCapturingEventOptions }); } this._ngZone.runOutsideAngular(() => { this._globalListeners.forEach((config, name) => { this._document.addEventListener(name, config.handler, config.options); }); }); } } /** Stops dragging a drag item instance. */ stopDragging(drag) { const index = this._activeDragInstances.indexOf(drag); if (index > -1) { this._activeDragInstances.splice(index, 1); if (this._activeDragInstances.length === 0) { this._clearGlobalListeners(); } } } /** Gets whether a drag item instance is currently being dragged. */ isDragging(drag) { return this._activeDragInstances.indexOf(drag) > -1; } ngOnDestroy() { this._dragInstances.forEach(instance => this.removeDragItem(instance)); this._dropInstances.forEach(instance => this.removeDropContainer(instance)); this._clearGlobalListeners(); this.pointerMove.complete(); this.pointerUp.complete(); } /** Clears out the global event listeners from the `document`. */ _clearGlobalListeners() { this._globalListeners.forEach((config, name) => { this._document.removeEventListener(name, config.handler, config.options); }); this._globalListeners.clear(); } } DragDropRegistry.ɵprov = i0.ɵɵdefineInjectable({ factory: function DragDropRegistry_Factory() { return new DragDropRegistry(i0.ɵɵinject(i0.NgZone), i0.ɵɵinject(i1.DOCUMENT)); }, token: DragDropRegistry, providedIn: "root" }); DragDropRegistry.decorators = [ { type: Injectable, args: [{ providedIn: 'root' },] } ]; DragDropRegistry.ctorParameters = () => [ { type: NgZone }, { type: undefined, decorators: [{ type: Inject, args: [DOCUMENT,] }] } ]; //# 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":["/**\n * @license\n * Copyright Google LLC All Rights Reserved.\n *\n * Use of this source code is governed by an MIT-style license that can be\n * found in the LICENSE file at https://angular.io/license\n */\n\nimport {Injectable, NgZone, OnDestroy, Inject} from '@angular/core';\nimport {DOCUMENT} from '@angular/common';\nimport {normalizePassiveListenerOptions} from '@angular/cdk/platform';\nimport {Subject} from 'rxjs';\n\n/** Event options that can be used to bind an active, capturing event. */\nconst activeCapturingEventOptions = normalizePassiveListenerOptions({\n  passive: false,\n  capture: true\n});\n\n/**\n * Service that keeps track of all the drag item and drop container\n * instances, and manages global event listeners on the `document`.\n * @docs-private\n */\n// Note: this class is generic, rather than referencing CdkDrag and CdkDropList directly, in order\n// to avoid circular imports. If we were to reference them here, importing the registry into the\n// classes that are registering themselves will introduce a circular import.\n@Injectable({providedIn: 'root'})\nexport class DragDropRegistry<I extends {isDragging(): boolean}, C> implements OnDestroy {\n  private _document: Document;\n\n  /** Registered drop container instances. */\n  private _dropInstances = new Set<C>();\n\n  /** Registered drag item instances. */\n  private _dragInstances = new Set<I>();\n\n  /** Drag item instances that are currently being dragged. */\n  private _activeDragInstances: I[] = [];\n\n  /** Keeps track of the event listeners that we've bound to the `document`. */\n  private _globalListeners = new Map<string, {\n    handler: (event: Event) => void,\n    options?: AddEventListenerOptions | boolean\n  }>();\n\n  /**\n   * Predicate function to check if an item is being dragged.  Moved out into a property,\n   * because it'll be called a lot and we don't want to create a new function every time.\n   */\n  private _draggingPredicate = (item: I) => item.isDragging();\n\n  /**\n   * Emits the `touchmove` or `mousemove` events that are dispatched\n   * while the user is dragging a drag item instance.\n   */\n  readonly pointerMove: Subject<TouchEvent | MouseEvent> = new Subject<TouchEvent | MouseEvent>();\n\n  /**\n   * Emits the `touchend` or `mouseup` events that are dispatched\n   * while the user is dragging a drag item instance.\n   */\n  readonly pointerUp: Subject<TouchEvent | MouseEvent> = new Subject<TouchEvent | MouseEvent>();\n\n  /** Emits when the viewport has been scrolled while the user is dragging an item. */\n  readonly scroll: Subject<Event> = new Subject<Event>();\n\n  constructor(\n    private _ngZone: NgZone,\n    @Inject(DOCUMENT) _document: any) {\n    this._document = _document;\n  }\n\n  /** Adds a drop container to the registry. */\n  registerDropContainer(drop: C) {\n    if (!this._dropInstances.has(drop)) {\n      this._dropInstances.add(drop);\n    }\n  }\n\n  /** Adds a drag item instance to the registry. */\n  registerDragItem(drag: I) {\n    this._dragInstances.add(drag);\n\n    // The `touchmove` event gets bound once, ahead of time, because WebKit\n    // won't preventDefault on a dynamically-added `touchmove` listener.\n    // See https://bugs.webkit.org/show_bug.cgi?id=184250.\n    if (this._dragInstances.size === 1) {\n      this._ngZone.runOutsideAngular(() => {\n        // The event handler has to be explicitly active,\n        // because newer browsers make it passive by default.\n        this._document.addEventListener('touchmove', this._persistentTouchmoveListener,\n            activeCapturingEventOptions);\n      });\n    }\n  }\n\n  /** Removes a drop container from the registry. */\n  removeDropContainer(drop: C) {\n    this._dropInstances.delete(drop);\n  }\n\n  /** Removes a drag item instance from the registry. */\n  removeDragItem(drag: I) {\n    this._dragInstances.delete(drag);\n    this.stopDragging(drag);\n\n    if (this._dragInstances.size === 0) {\n      this._document.removeEventListener('touchmove', this._persistentTouchmoveListener,\n          activeCapturingEventOptions);\n    }\n  }\n\n  /**\n   * Starts the dragging sequence for a drag instance.\n   * @param drag Drag instance which is being dragged.\n   * @param event Event that initiated the dragging.\n   */\n  startDragging(drag: I, event: TouchEvent | MouseEvent) {\n    // Do not process the same drag twice to avoid memory leaks and redundant listeners\n    if (this._activeDragInstances.indexOf(drag) > -1) {\n      return;\n    }\n\n    this._activeDragInstances.push(drag);\n\n    if (this._activeDragInstances.length === 1) {\n      const isTouchEvent = event.type.startsWith('touch');\n\n      // We explicitly bind __active__ listeners here, because newer browsers will default to\n      // passive ones for `mousemove` and `touchmove`. The events need to be active, because we\n      // use `preventDefault` to prevent the page from scrolling while the user is dragging.\n      this._globalListeners\n        .set(isTouchEvent ? 'touchend' : 'mouseup', {\n          handler: (e: Event) => this.pointerUp.next(e as TouchEvent | MouseEvent),\n          options: true\n        })\n        .set('scroll', {\n          handler: (e: Event) => this.scroll.next(e),\n          // Use capturing so that we pick up scroll changes in any scrollable nodes that aren't\n          // the document. See https://github.com/angular/components/issues/17144.\n          options: true\n        })\n        // Preventing the default action on `mousemove` isn't enough to disable text selection\n        // on Safari so we need to prevent the selection event as well. Alternatively this can\n        // be done by setting `user-select: none` on the `body`, however it has causes a style\n        // recalculation which can be expensive on pages with a lot of elements.\n        .set('selectstart', {\n          handler: this._preventDefaultWhileDragging,\n          options: activeCapturingEventOptions\n        });\n\n      // We don't have to bind a move event for touch drag sequences, because\n      // we already have a persistent global one bound from `registerDragItem`.\n      if (!isTouchEvent) {\n        this._globalListeners.set('mousemove', {\n          handler: (e: Event) => this.pointerMove.next(e as MouseEvent),\n          options: activeCapturingEventOptions\n        });\n      }\n\n      this._ngZone.runOutsideAngular(() => {\n        this._globalListeners.forEach((config, name) => {\n          this._document.addEventListener(name, config.handler, config.options);\n        });\n      });\n    }\n  }\n\n  /** Stops dragging a drag item instance. */\n  stopDragging(drag: I) {\n    const index = this._activeDragInstances.indexOf(drag);\n\n    if (index > -1) {\n      this._activeDragInstances.splice(index, 1);\n\n      if (this._activeDragInstances.length === 0) {\n        this._clearGlobalListeners();\n      }\n    }\n  }\n\n  /** Gets whether a drag item instance is currently being dragged. */\n  isDragging(drag: I) {\n    return this._activeDragInstances.indexOf(drag) > -1;\n  }\n\n  ngOnDestroy() {\n    this._dragInstances.forEach(instance => this.removeDragItem(instance));\n    this._dropInstances.forEach(instance => this.removeDropContainer(instance));\n    this._clearGlobalListeners();\n    this.pointerMove.complete();\n    this.pointerUp.complete();\n  }\n\n  /**\n   * Event listener that will prevent the default browser action while the user is dragging.\n   * @param event Event whose default action should be prevented.\n   */\n  private _preventDefaultWhileDragging = (event: Event) => {\n    if (this._activeDragInstances.length > 0) {\n      event.preventDefault();\n    }\n  }\n\n  /** Event listener for `touchmove` that is bound even if no dragging is happening. */\n  private _persistentTouchmoveListener = (event: TouchEvent) => {\n    if (this._activeDragInstances.length > 0) {\n      // Note that we only want to prevent the default action after dragging has actually started.\n      // Usually this is the same time at which the item is added to the `_activeDragInstances`,\n      // but it could be pushed back if the user has set up a drag delay or threshold.\n      if (this._activeDragInstances.some(this._draggingPredicate)) {\n        event.preventDefault();\n      }\n\n      this.pointerMove.next(event);\n    }\n  }\n\n  /** Clears out the global event listeners from the `document`. */\n  private _clearGlobalListeners() {\n    this._globalListeners.forEach((config, name) => {\n      this._document.removeEventListener(name, config.handler, config.options);\n    });\n\n    this._globalListeners.clear();\n  }\n}\n"]}