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gentics-ui-core

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This is the common core framework for the Gentics CMS and Mesh UI, and other Angular applications.

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import { EventEmitter, Inject, Injectable, InjectionToken, Optional, Output } from '@angular/core'; import { Observable } from 'rxjs'; import { filter, mapTo } from 'rxjs/operators'; import { getDataTransfer, transferHasFiles } from './drag-drop-utils'; import { DragStateTrackerFactory } from './drag-state-tracker.service'; import { matchesMimeType } from './matches-mime-type'; import * as i0 from "@angular/core"; import * as i1 from "./drag-state-tracker.service"; /** * A token that can be used to inject a mock into the service * @internal */ export const PAGE_FILE_DRAG_EVENT_TARGET = new InjectionToken('PAGE_FILE_DRAG_EVENT_TARGET'); /** * A helper service that listens for dragenter/dragleave/drop events on the window * and tracks when files are dragged into or out of the active tab. * * When files are accidentally dropped on the tab outside of a drop zone, the drop * can be cancelled to prevent the browser from opening/downloading the file. * See {@link gtxPreventFileDrop} for details. */ export class PageFileDragHandler { constructor(eventTarget, dragState) { /** * Fires when a drop event is prevented. */ this.dropPrevented = new EventEmitter(); this._filesDragged = []; this._eventsBound = false; this._componentsWantingToPreventFileDrop = new Set(); this._preventAccidentalFileDrop = false; this.preventAccidentalDrop = (event) => { let dataTransfer = getDataTransfer(event); if (this._preventAccidentalFileDrop && !event.defaultPrevented && transferHasFiles(dataTransfer)) { event.preventDefault(); dataTransfer.effectAllowed = 'none'; dataTransfer.dropEffect = 'none'; if (event.type === 'drop') { this.dropPrevented.emit(undefined); } } }; if (eventTarget) { this._eventTarget = eventTarget; } else if (typeof window === 'object') { this._eventTarget = window; } else { throw new Error('No event target for PageFileDragHandler.'); } this.filesDragged$ = dragState.trackElement(this._eventTarget); this.dragEnter = this.filesDragged$.pipe(filter(list => list.length > 0)); this.dragStop = this.filesDragged$.pipe(filter(list => list.length === 0), mapTo(false)); this.bindEvents(); } /** * Returns true if a file is dragged over the current page/tab. * @example * class Component { * constructor(private pageDragStatus: PageFileDragStatusService) {} * } * * <ul *ngIf="pageDragStatus.filesDragged"> ... </ul> */ get filesDragged() { return this._filesDragged; } /** * Returns true if files are dragged over the current tab and any file matches the specified mime type. * @example * class Component { * constructor(private pageDragStatus: PageFileDragStatusService) {} * } * * <ul *ngIf="pageDragStatus.anyDraggedFileIs('image/*')"> ... </ul> */ anyDraggedFileIs(allowedTypes) { return !!(this._filesDragged.length && this._filesDragged.some(file => matchesMimeType(file.type, allowedTypes))); } /** * Returns true if files are dragged over the current page and all files match the specified mime type. * @example * class Component { * constructor(private pageDragStatus: PageFileDragStatusService) {} * } * * <ul *ngIf="pageDragStatus.allDraggedFilesAre('image/*')"> ... </ul> */ allDraggedFilesAre(allowedTypes) { return !!(this._filesDragged.length && this._filesDragged.every(file => matchesMimeType(file.type, allowedTypes))); } destroy() { this.unbindEvents(); if (this._subscription) { this._subscription.unsubscribe(); this._subscription = undefined; } this._componentsWantingToPreventFileDrop = new Set(); this._preventAccidentalFileDrop = false; } /** @internal */ bindEvents() { if (this._eventsBound) { return; } this._subscription = this.filesDragged$.subscribe(dragged => this._filesDragged = dragged); this._eventTarget.addEventListener('dragenter', this.preventAccidentalDrop, false); this._eventTarget.addEventListener('dragover', this.preventAccidentalDrop, false); this._eventTarget.addEventListener('drop', this.preventAccidentalDrop, false); this._eventsBound = true; } /** @internal */ unbindEvents() { this._eventTarget.removeEventListener('dragenter', this.preventAccidentalDrop, false); this._eventTarget.removeEventListener('dragover', this.preventAccidentalDrop, false); this._eventTarget.removeEventListener('drop', this.preventAccidentalDrop, false); this._eventsBound = false; } /** @internal */ preventFileDropOnPageFor(directive, prevent) { if (prevent) { this._componentsWantingToPreventFileDrop.add(directive); } else { this._componentsWantingToPreventFileDrop.delete(directive); } this._preventAccidentalFileDrop = this._componentsWantingToPreventFileDrop.size > 0; } } /** @nocollapse */ PageFileDragHandler.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "13.3.8", ngImport: i0, type: PageFileDragHandler, deps: [{ token: PAGE_FILE_DRAG_EVENT_TARGET, optional: true }, { token: i1.DragStateTrackerFactory }], target: i0.ɵɵFactoryTarget.Injectable }); /** @nocollapse */ PageFileDragHandler.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "13.3.8", ngImport: i0, type: PageFileDragHandler }); i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "13.3.8", ngImport: i0, type: PageFileDragHandler, decorators: [{ type: Injectable }], ctorParameters: function () { return [{ type: undefined, decorators: [{ type: Optional }, { type: Inject, args: [PAGE_FILE_DRAG_EVENT_TARGET] }] }, { type: i1.DragStateTrackerFactory }]; }, propDecorators: { filesDragged$: [{ type: Output }], dragEnter: [{ type: Output }], dragStop: [{ type: Output }], dropPrevented: [{ type: Output }] } }); //# 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{ EventEmitter, Inject, Injectable, InjectionToken, Optional, Output, Directive } from '@angular/core';\nimport {Observable, Subscription} from 'rxjs';\nimport {filter, mapTo} from 'rxjs/operators';\n\nimport {getDataTransfer, transferHasFiles} from './drag-drop-utils';\nimport {DragStateTrackerFactory, FileDragState} from './drag-state-tracker.service';\nimport {matchesMimeType} from './matches-mime-type';\n\n/**\n * A token that can be used to inject a mock into the service\n * @internal\n */\nexport const PAGE_FILE_DRAG_EVENT_TARGET = new InjectionToken('PAGE_FILE_DRAG_EVENT_TARGET');\n\n/**\n * A helper service that listens for dragenter/dragleave/drop events on the window\n * and tracks when files are dragged into or out of the active tab.\n *\n * When files are accidentally dropped on the tab outside of a drop zone, the drop\n * can be cancelled to prevent the browser from opening/downloading the file.\n * See {@link gtxPreventFileDrop} for details.\n */\n@Injectable()\nexport class PageFileDragHandler {\n\n    /**\n     * Fires when a file is dragged into the current tab, dragged out or dropped.\n     * @exmample\n     *   class Component {\n     *     constructor(private pageDrag: PageFileDragStatusService) { }\n     *   }\n     *\n     *   <ul *ngIf=\"pageDrag.filesDragged$ | async\"> ... </ul>\n     */\n    @Output() filesDragged$: Observable<FileDragState>;\n\n    /**\n     * Emits a list when a file is dragged into the current tab.\n     * The list contains `{ \"type\": string }` elements.\n     */\n    @Output() dragEnter: Observable<FileDragState>;\n\n    /**\n     * Emits false when a file is dragged out of the current tab.\n     */\n    @Output() dragStop: Observable<boolean>;\n\n    /**\n     * Fires when a drop event is prevented.\n     */\n    @Output() dropPrevented = new EventEmitter<void>();\n\n\n    private _filesDragged: FileDragState = [];\n    private _subscription: Subscription;\n    private _eventTarget: EventTarget;\n    private _eventsBound = false;\n    private _componentsWantingToPreventFileDrop = new Set<any>();\n    private _preventAccidentalFileDrop = false;\n\n    /**\n     * Returns true if a file is dragged over the current page/tab.\n     * @example\n     *   class Component {\n     *     constructor(private pageDragStatus: PageFileDragStatusService) {}\n     *   }\n     *\n     *   <ul *ngIf=\"pageDragStatus.filesDragged\"> ... </ul>\n     */\n    public get filesDragged(): FileDragState {\n        return this._filesDragged;\n    }\n\n    /**\n     * Returns true if files are dragged over the current tab and any file matches the specified mime type.\n     * @example\n     *   class Component {\n     *     constructor(private pageDragStatus: PageFileDragStatusService) {}\n     *   }\n     *\n     *   <ul *ngIf=\"pageDragStatus.anyDraggedFileIs('image/*')\"> ... </ul>\n     */\n    public anyDraggedFileIs(allowedTypes: string): boolean {\n        return !!(this._filesDragged.length && this._filesDragged.some(file =>\n            matchesMimeType(file.type, allowedTypes)));\n    }\n\n    /**\n     * Returns true if files are dragged over the current page and all files match the specified mime type.\n     * @example\n     *   class Component {\n     *     constructor(private pageDragStatus: PageFileDragStatusService) {}\n     *   }\n     *\n     *   <ul *ngIf=\"pageDragStatus.allDraggedFilesAre('image/*')\"> ... </ul>\n     */\n    public allDraggedFilesAre(allowedTypes: string): boolean {\n        return !!(this._filesDragged.length && this._filesDragged.every(file =>\n            matchesMimeType(file.type, allowedTypes)));\n    }\n\n\n    constructor(@Optional() @Inject(PAGE_FILE_DRAG_EVENT_TARGET) eventTarget: any,\n                dragState: DragStateTrackerFactory) {\n\n        if (eventTarget) {\n            this._eventTarget = eventTarget;\n        } else if (typeof window === 'object') {\n            this._eventTarget = window;\n        } else {\n            throw new Error('No event target for PageFileDragHandler.');\n        }\n\n        this.filesDragged$ = dragState.trackElement(this._eventTarget);\n        this.dragEnter = this.filesDragged$.pipe(\n            filter(list => list.length > 0)\n        );\n        this.dragStop = this.filesDragged$.pipe(\n            filter(list => list.length === 0),\n            mapTo(false)\n        );\n        this.bindEvents();\n    }\n\n    destroy(): void {\n        this.unbindEvents();\n        if (this._subscription) {\n            this._subscription.unsubscribe();\n            this._subscription = undefined;\n        }\n        this._componentsWantingToPreventFileDrop = new Set<HTMLElement>();\n        this._preventAccidentalFileDrop = false;\n    }\n\n    /** @internal */\n    bindEvents(): void {\n        if (this._eventsBound) { return; }\n        this._subscription = this.filesDragged$.subscribe(dragged => this._filesDragged = dragged);\n        this._eventTarget.addEventListener('dragenter', this.preventAccidentalDrop, false);\n        this._eventTarget.addEventListener('dragover', this.preventAccidentalDrop, false);\n        this._eventTarget.addEventListener('drop', this.preventAccidentalDrop, false);\n        this._eventsBound = true;\n    }\n\n    /** @internal */\n    unbindEvents(): void {\n        this._eventTarget.removeEventListener('dragenter', this.preventAccidentalDrop, false);\n        this._eventTarget.removeEventListener('dragover', this.preventAccidentalDrop, false);\n        this._eventTarget.removeEventListener('drop', this.preventAccidentalDrop, false);\n        this._eventsBound = false;\n    }\n\n    /** @internal */\n    preventFileDropOnPageFor(directive: any, prevent: boolean): void {\n        if (prevent) {\n            this._componentsWantingToPreventFileDrop.add(directive);\n        } else {\n            this._componentsWantingToPreventFileDrop.delete(directive);\n        }\n        this._preventAccidentalFileDrop = this._componentsWantingToPreventFileDrop.size > 0;\n    }\n\n    private preventAccidentalDrop = (event: DragEvent) => {\n        let dataTransfer = getDataTransfer(event);\n        if (this._preventAccidentalFileDrop && !event.defaultPrevented && transferHasFiles(dataTransfer)) {\n            event.preventDefault();\n            dataTransfer.effectAllowed = 'none';\n            dataTransfer.dropEffect = 'none';\n            if (event.type === 'drop') {\n                this.dropPrevented.emit(undefined);\n            }\n        }\n    }\n\n}\n"]}