@ng-dnd/sortable
Version:
Sortable for Angular DnD
179 lines • 20.5 kB
JavaScript
import { ChangeDetectorRef, Directive, ElementRef, Input, } from '@angular/core';
import { DndService } from '@ng-dnd/core';
import { BehaviorSubject, Subscription } from 'rxjs';
import { isEmpty } from '../isEmpty';
import { HoverTrigger } from '../types';
import * as i0 from "@angular/core";
import * as i1 from "@ng-dnd/core";
export class DndSortable {
/** @ignore */
constructor(dnd, el, cdr) {
this.dnd = dnd;
this.el = el;
this.cdr = cdr;
this.listId = Math.random().toString();
this.horizontal = false;
/**
* Possible values:
*
* - 'halfway' (default): triggers a reorder when you drag halfway over a neighbour
* - 'fixed': triggers as soon as you move over a neighbouring element. Does not work with variable size elements. */
this.hoverTrigger = HoverTrigger.halfway;
/** @ignore */
this.childrenSubject$ = new BehaviorSubject([]);
/** A handy way to subscribe to spec.getList(). */
this.children$ = this.childrenSubject$;
/** @ignore */
this.subs = new Subscription();
/** @ignore */
this.listSubs = new Subscription();
this.target = this.dnd.dropTarget(null, {
canDrop: monitor => {
if (!this.acceptsType(monitor.getItemType())) {
return false;
}
const item = monitor.getItem();
if (!item) {
return false;
}
return this.getCanDrop(item, monitor);
},
drop: monitor => {
const item = monitor.getItem();
if (item && this.getCanDrop(item, monitor)) {
this.spec.drop?.(item, monitor);
}
return {};
},
hover: monitor => {
const item = monitor.getItem();
if (this.children && isEmpty(this.children) && item) {
const canDrop = this.getCanDrop(item, monitor);
if (canDrop && monitor.isOver({ shallow: true })) {
this.callHover(item, monitor, {
listId: this.listId,
index: 0,
});
}
}
},
}, this.subs);
}
contextFor(data, index) {
return {
data,
index,
listId: this.listId,
spec: this.spec,
horizontal: this.horizontal,
hoverTrigger: this.hoverTrigger,
};
}
/** @ignore */
updateSubscription() {
if (this.listId != null && this.spec) {
if (this.listSubs) {
this.subs.remove(this.listSubs);
this.listSubs.unsubscribe();
}
if (this.spec.getList) {
const cs$ = this.spec.getList(this.listId);
this.listSubs = cs$?.subscribe(l => {
if (l) {
this.childrenSubject$.next(l);
this.children = l;
this.cdr.markForCheck();
}
});
this.subs.add(this.listSubs);
}
}
}
/** @ignore */
getCanDrop(item, monitor, _default = true) {
if (this.spec.canDrop) {
return this.spec.canDrop(item, monitor);
}
return _default;
}
/** @ignore */
callHover(item, monitor, newHover) {
if (newHover) {
// mutate the object
item.hover = newHover;
// but also shallow clone so distinct from previous,
// useful if you rely on that for ngrx
item = { ...item };
}
this.spec.hover?.(item, monitor);
}
/** @ignore */
ngOnInit() {
this.updateSubscription();
this.target.setTypes(this.getTargetType());
}
getTargetType() {
if (Array.isArray(this.spec.accepts)) {
return this.spec.accepts;
}
else {
return this.spec.accepts || this.spec.type;
}
}
acceptsType(ty) {
if (ty == null)
return false;
if (Array.isArray(this.spec.accepts)) {
const arr = this.spec.accepts;
return arr.indexOf(ty) !== -1;
}
else {
const acc = this.getTargetType();
return ty == acc;
}
}
/** @ignore */
ngOnChanges({ spec, listId }) {
if (listId) {
this.updateSubscription();
}
if (spec) {
this.updateSubscription();
}
this.target.setTypes(this.getTargetType());
}
/** @ignore */
ngAfterViewInit() {
if (this.el) {
this.target.connectDropTarget(this.el.nativeElement);
}
else {
throw new Error('dndSortable directive must have ElementRef');
}
}
/** @ignore */
ngOnDestroy() {
this.subs.unsubscribe();
}
/** @nocollapse */ static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "18.2.5", ngImport: i0, type: DndSortable, deps: [{ token: i1.DndService }, { token: i0.ElementRef }, { token: i0.ChangeDetectorRef }], target: i0.ɵɵFactoryTarget.Directive }); }
/** @nocollapse */ static { this.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "18.2.5", type: DndSortable, isStandalone: true, selector: "[dndSortable]", inputs: { listId: "listId", horizontal: "horizontal", spec: "spec", children: "children", hoverTrigger: "hoverTrigger" }, exportAs: ["dndSortable"], usesOnChanges: true, ngImport: i0 }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "18.2.5", ngImport: i0, type: DndSortable, decorators: [{
type: Directive,
args: [{
selector: '[dndSortable]',
exportAs: 'dndSortable',
standalone: true,
}]
}], ctorParameters: () => [{ type: i1.DndService }, { type: i0.ElementRef }, { type: i0.ChangeDetectorRef }], propDecorators: { listId: [{
type: Input
}], horizontal: [{
type: Input
}], spec: [{
type: Input
}], children: [{
type: Input
}], hoverTrigger: [{
type: Input
}] } });
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rt {\n  AfterViewInit,\n  ChangeDetectorRef,\n  Directive,\n  ElementRef,\n  Input,\n  OnChanges,\n  OnDestroy,\n  OnInit,\n  SimpleChanges,\n} from '@angular/core';\nimport { DndService, DropTarget, DropTargetMonitor } from '@ng-dnd/core';\nimport { BehaviorSubject, Observable, Subscription } from 'rxjs';\nimport { isEmpty } from '../isEmpty';\nimport { DraggedItem, HoverTrigger, RenderContext, SortableSpec } from '../types';\n\n@Directive({\n  selector: '[dndSortable]',\n  exportAs: 'dndSortable',\n  standalone: true,\n})\nexport class DndSortable<Data> implements OnChanges, OnInit, AfterViewInit, OnDestroy {\n  @Input() listId: any = Math.random().toString();\n  @Input() horizontal = false;\n  @Input() spec!: SortableSpec<Data>;\n  @Input() children?: Iterable<Data>;\n  /**\n   * Possible values:\n   *\n   * - 'halfway' (default): triggers a reorder when you drag halfway over a neighbour\n   * - 'fixed': triggers as soon as you move over a neighbouring element. Does not work with variable size elements. */\n  @Input() hoverTrigger = HoverTrigger.halfway;\n\n  /** @ignore */\n  private childrenSubject$ = new BehaviorSubject<Iterable<Data>>([]);\n  /** A handy way to subscribe to spec.getList(). */\n  children$: Observable<Iterable<Data>> = this.childrenSubject$;\n\n  /** @ignore */\n  subs = new Subscription();\n  /** @ignore */\n  listSubs = new Subscription();\n\n  /**\n   * This DropTarget is attached to the whole list.\n   *\n   * You may monitor it for information like 'is an item hovering over this entire list somewhere?'\n   */\n  target: DropTarget<DraggedItem<Data>>;\n\n  /** @ignore */\n  constructor(\n    protected dnd: DndService,\n    protected el: ElementRef<HTMLElement>,\n    protected cdr: ChangeDetectorRef\n  ) {\n    this.target = this.dnd.dropTarget<DraggedItem<Data>>(\n      null,\n      {\n        canDrop: monitor => {\n          if (!this.acceptsType(monitor.getItemType())) {\n            return false;\n          }\n          const item = monitor.getItem();\n          if (!item) {\n            return false;\n          }\n          return this.getCanDrop(item, monitor);\n        },\n        drop: monitor => {\n          const item = monitor.getItem();\n          if (item && this.getCanDrop(item, monitor)) {\n            this.spec.drop?.(item, monitor);\n          }\n          return {};\n        },\n        hover: monitor => {\n          const item = monitor.getItem();\n          if (this.children && isEmpty(this.children) && item) {\n            const canDrop = this.getCanDrop(item, monitor);\n            if (canDrop && monitor.isOver({ shallow: true })) {\n              this.callHover(item, monitor, {\n                listId: this.listId,\n                index: 0,\n              });\n            }\n          }\n        },\n      },\n      this.subs\n    );\n  }\n\n  contextFor(data: Data, index: number): RenderContext<Data> {\n    return {\n      data,\n      index,\n      listId: this.listId,\n      spec: this.spec,\n      horizontal: this.horizontal,\n      hoverTrigger: this.hoverTrigger,\n    };\n  }\n\n  /** @ignore */\n  private updateSubscription() {\n    if (this.listId != null && this.spec) {\n      if (this.listSubs) {\n        this.subs.remove(this.listSubs);\n        this.listSubs.unsubscribe();\n      }\n\n      if (this.spec.getList) {\n        const cs$ = this.spec.getList(this.listId);\n        this.listSubs = cs$?.subscribe(l => {\n          if (l) {\n            this.childrenSubject$.next(l);\n            this.children = l;\n            this.cdr.markForCheck();\n          }\n        });\n\n        this.subs.add(this.listSubs);\n      }\n    }\n  }\n\n  /** @ignore */\n  private getCanDrop(\n    item: DraggedItem<Data>,\n    monitor: DropTargetMonitor<DraggedItem<Data>>,\n    _default = true\n  ) {\n    if (this.spec.canDrop) {\n      return this.spec.canDrop(item, monitor);\n    }\n    return _default;\n  }\n\n  /** @ignore */\n  private callHover(\n    item: DraggedItem<Data>,\n    monitor: DropTargetMonitor<DraggedItem<Data>>,\n    newHover?: { listId: any; index: number }\n  ) {\n    if (newHover) {\n      // mutate the object\n      item.hover = newHover;\n      // but also shallow clone so distinct from previous,\n      // useful if you rely on that for ngrx\n      item = { ...item };\n    }\n    this.spec.hover?.(item, monitor);\n  }\n\n  /** @ignore */\n  ngOnInit() {\n    this.updateSubscription();\n    this.target.setTypes(this.getTargetType());\n  }\n\n  getTargetType() {\n    if (Array.isArray(this.spec.accepts)) {\n      return this.spec.accepts;\n    } else {\n      return this.spec.accepts || this.spec.type;\n    }\n  }\n\n  acceptsType(ty: string | symbol | null) {\n    if (ty == null) return false;\n    if (Array.isArray(this.spec.accepts)) {\n      const arr = this.spec.accepts;\n      return arr.indexOf(ty) !== -1;\n    } else {\n      const acc = this.getTargetType();\n      return ty == acc;\n    }\n  }\n\n  /** @ignore */\n  ngOnChanges({ spec, listId }: SimpleChanges) {\n    if (listId) {\n      this.updateSubscription();\n    }\n    if (spec) {\n      this.updateSubscription();\n    }\n    this.target.setTypes(this.getTargetType());\n  }\n\n  /** @ignore */\n  ngAfterViewInit() {\n    if (this.el) {\n      this.target.connectDropTarget(this.el.nativeElement);\n    } else {\n      throw new Error('dndSortable directive must have ElementRef');\n    }\n  }\n\n  /** @ignore */\n  ngOnDestroy() {\n    this.subs.unsubscribe();\n  }\n}\n"]}