@ux-aspects/ux-aspects
Version:
Open source user interface framework for building modern, responsive, mobile big data applications
102 lines • 13.4 kB
JavaScript
import { Directive, EventEmitter, HostListener, inject, Input, Output } from '@angular/core';
import { Subject } from 'rxjs';
import { filter, takeUntil, tap } from 'rxjs/operators';
import { DragService } from './drag.service';
import * as i0 from "@angular/core";
export class DropDirective {
constructor() {
this._dragService = inject(DragService);
/** Define whether or not dropping is enabled */
this.dropDisabled = false;
/** Emit the model of the item dropped */
this.onDrop = new EventEmitter();
/** Determine whether or not the mouse is within the drop region */
this.isMouseOver = false;
/** Determine whether or not we are currently dragging an item */
this.isDragging = false;
/** Ensure we destroy all subscriptions */
this._onDestroy = new Subject();
// subscribe to drag events
this._dragService.onDragStart.pipe(tap(event => this._group = event.group), filter(event => this.isDropAllowed(event.group)), takeUntil(this._onDestroy))
.subscribe(this.onDragStart.bind(this));
this._dragService.onDragEnd.pipe(filter(event => this.isDropAllowed(event.group)), takeUntil(this._onDestroy))
.subscribe(this.onDragEnd.bind(this));
}
ngOnDestroy() {
this._onDestroy.next();
this._onDestroy.complete();
}
/** Update the mouse over state */
onMouseOver() {
if (this.isDropAllowed(this._group)) {
this.isMouseOver = true;
// emit that we are over a drop area
this._dragService.onDropEnter.next();
}
}
/** Update the mouse over state */
onMouseLeave() {
// always ensure this value is reset
this.isMouseOver = false;
// only emit the dropd leave event when appropriate
if (this.isDropAllowed(this._group)) {
this._dragService.onDropLeave.next();
}
}
/** Update the dragging state */
onDragStart() {
this.isDragging = true;
}
/** Update the dragging state */
onDragEnd(event) {
// update the dragging state
this.isDragging = false;
// clear the cached group
this._group = null;
// if the mouse is over and it is in an allowed group emit the dop event
if (this.isMouseOver && this.isDropAllowed(event.group)) {
this.onDrop.emit(event.data);
this._dragService.onDrop.next(event.data);
}
}
/** Determine whether or not the event is part of the specified groups */
isDropAllowed(group) {
// if dropping is disabled then it is never allowed
if (this.dropDisabled) {
return false;
}
// if no group specified allow all groups
if (!this.group) {
return true;
}
// if it is an array then ensure it is allowed
if (Array.isArray(this.group)) {
return !!this.group.find(_group => _group === group);
}
return this.group === group;
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "18.2.12", ngImport: i0, type: DropDirective, deps: [], target: i0.ɵɵFactoryTarget.Directive }); }
static { this.ɵdir = i0.ɵɵngDeclareDirective({ minVersion: "14.0.0", version: "18.2.12", type: DropDirective, selector: "[uxDrop]", inputs: { group: "group", dropDisabled: "dropDisabled" }, outputs: { onDrop: "onDrop" }, host: { listeners: { "mouseenter": "onMouseOver()", "mouseleave": "onMouseLeave()" }, properties: { "class.ux-drop-hover": "isMouseOver && isDragging && !dropDisabled" } }, ngImport: i0 }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "18.2.12", ngImport: i0, type: DropDirective, decorators: [{
type: Directive,
args: [{
selector: '[uxDrop]',
host: {
'[class.ux-drop-hover]': 'isMouseOver && isDragging && !dropDisabled'
}
}]
}], ctorParameters: () => [], propDecorators: { group: [{
type: Input
}], dropDisabled: [{
type: Input
}], onDrop: [{
type: Output
}], onMouseOver: [{
type: HostListener,
args: ['mouseenter']
}], onMouseLeave: [{
type: HostListener,
args: ['mouseleave']
}] } });
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{ Directive, EventEmitter, HostListener, inject, Input, OnDestroy, Output } from '@angular/core';\nimport { Subject } from 'rxjs';\nimport { filter, takeUntil, tap } from 'rxjs/operators';\nimport { DragService, UxDragEvent } from './drag.service';\n\n@Directive({\n    selector: '[uxDrop]',\n    host: {\n        '[class.ux-drop-hover]': 'isMouseOver && isDragging && !dropDisabled'\n    }\n})\nexport class DropDirective<T = unknown> implements OnDestroy {\n    private readonly _dragService = inject<DragService<T>>(DragService);\n\n    /** Define a specific group of dragged items to listen to */\n    @Input() group: string | string[];\n\n    /** Define whether or not dropping is enabled */\n    @Input() dropDisabled: boolean = false;\n\n    /** Emit the model of the item dropped */\n    @Output() onDrop = new EventEmitter<T>();\n\n    /** Determine whether or not the mouse is within the drop region */\n    isMouseOver: boolean = false;\n\n    /** Determine whether or not we are currently dragging an item */\n    isDragging: boolean = false;\n\n    /** Store the group of the dragged item */\n    private _group: string;\n\n    /** Ensure we destroy all subscriptions */\n    private readonly _onDestroy = new Subject<void>();\n\n    constructor() {\n        // subscribe to drag events\n        this._dragService.onDragStart.pipe(tap(event => this._group = event.group), filter(event => this.isDropAllowed(event.group)), takeUntil(this._onDestroy))\n            .subscribe(this.onDragStart.bind(this));\n\n        this._dragService.onDragEnd.pipe(filter(event => this.isDropAllowed(event.group)), takeUntil(this._onDestroy))\n            .subscribe(this.onDragEnd.bind(this));\n    }\n\n    ngOnDestroy(): void {\n        this._onDestroy.next();\n        this._onDestroy.complete();\n    }\n\n    /** Update the mouse over state */\n    @HostListener('mouseenter')\n    onMouseOver(): void {\n        if (this.isDropAllowed(this._group)) {\n            this.isMouseOver = true;\n\n            // emit that we are over a drop area\n            this._dragService.onDropEnter.next();\n        }\n    }\n\n    /** Update the mouse over state */\n    @HostListener('mouseleave')\n    onMouseLeave(): void {\n\n        // always ensure this value is reset\n        this.isMouseOver = false;\n\n        // only emit the dropd leave event when appropriate\n        if (this.isDropAllowed(this._group)) {\n            this._dragService.onDropLeave.next();\n        }\n    }\n\n    /** Update the dragging state */\n    onDragStart(): void {\n        this.isDragging = true;\n    }\n\n    /** Update the dragging state */\n    onDragEnd(event: UxDragEvent<T>): void {\n\n        // update the dragging state\n        this.isDragging = false;\n\n        // clear the cached group\n        this._group = null;\n\n        // if the mouse is over and it is in an allowed group emit the dop event\n        if (this.isMouseOver && this.isDropAllowed(event.group)) {\n            this.onDrop.emit(event.data);\n            this._dragService.onDrop.next(event.data);\n        }\n    }\n\n    /** Determine whether or not the event is part of the specified groups */\n    private isDropAllowed(group: string): boolean {\n\n        // if dropping is disabled then it is never allowed\n        if (this.dropDisabled) {\n            return false;\n        }\n\n        // if no group specified allow all groups\n        if (!this.group) {\n            return true;\n        }\n\n        // if it is an array then ensure it is allowed\n        if (Array.isArray(this.group)) {\n            return !!this.group.find(_group => _group === group);\n        }\n\n        return this.group === group;\n    }\n}\n"]}