@ux-aspects/ux-aspects
Version:
Open source user interface framework for building modern, responsive, mobile big data applications
101 lines • 14.7 kB
JavaScript
import { Injectable } from '@angular/core';
import { BehaviorSubject, isObservable, Subject } from 'rxjs';
import { takeUntil } from 'rxjs/operators';
import { TreeGridState } from './tree-grid-state.class';
import * as i0 from "@angular/core";
export class TreeGridService {
constructor() {
/** The raw table data */
this.data$ = new BehaviorSubject([]);
/** The flattened table data */
this.rows$ = new BehaviorSubject([]);
/** Ensure we destroy all observables correctly */
this._onDestroy = new Subject();
this.data$.pipe(takeUntil(this._onDestroy)).subscribe(data => this.rows$.next(this.getFlattenedTree(data)));
}
/** Unsubscribe from all observables */
ngOnDestroy() {
this._onDestroy.next();
this._onDestroy.complete();
}
/** Set the expanded state of a row */
async setExpanded(item, expanded) {
if (expanded) {
await this.getChildren(item);
this.insertChildren(item);
}
else {
this.removeChildren(item);
}
}
/** A function to flatten tree data */
getFlattenedTree(data, parent) {
// flatten the nodes at this level
return data.reduce((previous, item, index) => {
item.state = new TreeGridState(parent ? parent.state.level + 1 : 0, data.length, index + 1);
// Convert any child nodes
const children = (item.children && item.expanded) ? this.getFlattenedTree(item.children, item) : [];
// return the nodes in a flattened array
return [...previous, item, ...children];
}, []);
}
/** Load any children dynamically */
async getChildren(item) {
if (!item.children && this.loadChildren) {
item.state.loading$.next(true);
try {
item.children = await this.getNormalizedChildren(this.loadChildren(item));
}
finally {
item.state.loading$.next(false);
}
}
}
/** We want to support an array, a promise and an observable. This will return all types as a promise */
async getNormalizedChildren(response) {
// if it is already an observable do nothing
if (isObservable(response)) {
return await response.toPromise();
}
// if it is a promise wrap it as an observable
if (response instanceof Promise) {
return await response;
}
// if it is an array then make it an observable
return response;
}
/** Insert the children into the flattened tree at the correct location */
insertChildren(parent) {
if (!parent.children) {
return;
}
const rows = [...this.rows$.getValue()];
const index = rows.indexOf(parent);
if (index < 0) {
return;
}
// Skip duplicates - this could happen if an already expanded child has been inserted
const uniqueChildren = parent.children.filter(child => rows.indexOf(child) === -1);
const childRows = this.getFlattenedTree(uniqueChildren, parent);
rows.splice(index + 1, 0, ...childRows);
this.rows$.next(rows);
}
/** Remove all rows from the flattened tree */
removeChildren(parent) {
const rows = [...this.rows$.getValue()];
const index = rows.indexOf(parent);
if (index < 0) {
return;
}
while (index + 1 < rows.length && rows[index + 1].state.level > parent.state.level) {
rows.splice(index + 1, 1);
}
this.rows$.next(rows);
}
static { this.ɵfac = i0.ɵɵngDeclareFactory({ minVersion: "12.0.0", version: "18.2.12", ngImport: i0, type: TreeGridService, deps: [], target: i0.ɵɵFactoryTarget.Injectable }); }
static { this.ɵprov = i0.ɵɵngDeclareInjectable({ minVersion: "12.0.0", version: "18.2.12", ngImport: i0, type: TreeGridService }); }
}
i0.ɵɵngDeclareClassMetadata({ minVersion: "12.0.0", version: "18.2.12", ngImport: i0, type: TreeGridService, decorators: [{
type: Injectable
}], ctorParameters: () => [] });
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{ Injectable, OnDestroy } from '@angular/core';\nimport { BehaviorSubject, isObservable, Observable, Subject } from 'rxjs';\nimport { takeUntil } from 'rxjs/operators';\nimport { TreeGridItem } from './tree-grid-item.interface';\nimport { TreeGridLoadFunction } from './tree-grid-load-function.type';\nimport { TreeGridState } from './tree-grid-state.class';\n\n@Injectable()\nexport class TreeGridService implements OnDestroy {\n\n    /** The raw table data */\n    data$ = new BehaviorSubject<TreeGridItem[]>([]);\n\n    /** The flattened table data */\n    rows$ = new BehaviorSubject<TreeGridItem[]>([]);\n\n    /** The function to load child items */\n    loadChildren: TreeGridLoadFunction;\n\n    /** Ensure we destroy all observables correctly */\n    private readonly _onDestroy = new Subject<void>();\n\n    constructor() {\n        this.data$.pipe(takeUntil(this._onDestroy)).subscribe(data => this.rows$.next(this.getFlattenedTree(data)));\n    }\n\n    /** Unsubscribe from all observables */\n    ngOnDestroy(): void {\n        this._onDestroy.next();\n        this._onDestroy.complete();\n    }\n\n    /** Set the expanded state of a row */\n    async setExpanded(item: TreeGridItem, expanded: boolean) {\n        if (expanded) {\n            await this.getChildren(item);\n            this.insertChildren(item);\n        } else {\n            this.removeChildren(item);\n        }\n    }\n\n    /** A function to flatten tree data */\n    private getFlattenedTree(data: TreeGridItem[], parent?: TreeGridItem): TreeGridItem[] {\n        // flatten the nodes at this level\n        return data.reduce((previous, item, index) => {\n\n            item.state = new TreeGridState(parent ? parent.state.level + 1 : 0, data.length, index + 1);\n\n            // Convert any child nodes\n            const children = (item.children && item.expanded) ? this.getFlattenedTree(item.children, item) : [];\n\n            // return the nodes in a flattened array\n            return [...previous, item, ...children];\n        }, []);\n    }\n\n    /** Load any children dynamically */\n    private async getChildren(item: TreeGridItem): Promise<void> {\n        if (!item.children && this.loadChildren) {\n            item.state.loading$.next(true);\n\n            try {\n                item.children = await this.getNormalizedChildren(this.loadChildren(item));\n            }\n            finally {\n                item.state.loading$.next(false);\n            }\n        }\n    }\n\n    /** We want to support an array, a promise and an observable. This will return all types as a promise */\n    private async getNormalizedChildren(response: TreeGridItem[] | Promise<TreeGridItem[]> | Observable<TreeGridItem[]>): Promise<TreeGridItem[]> {\n\n        // if it is already an observable do nothing\n        if (isObservable(response)) {\n            return await response.toPromise();\n        }\n\n        // if it is a promise wrap it as an observable\n        if (response instanceof Promise) {\n            return await response;\n        }\n\n        // if it is an array then make it an observable\n        return response;\n    }\n\n    /** Insert the children into the flattened tree at the correct location */\n    private insertChildren(parent: TreeGridItem): void {\n        if (!parent.children) {\n            return;\n        }\n\n        const rows = [...this.rows$.getValue()];\n\n        const index = rows.indexOf(parent);\n\n        if (index < 0) {\n            return;\n        }\n\n        // Skip duplicates - this could happen if an already expanded child has been inserted\n        const uniqueChildren = parent.children.filter(child => rows.indexOf(child) === -1);\n\n        const childRows = this.getFlattenedTree(uniqueChildren, parent);\n\n        rows.splice(index + 1, 0, ...childRows);\n\n        this.rows$.next(rows);\n    }\n\n    /** Remove all rows from the flattened tree */\n    private removeChildren(parent: TreeGridItem): void {\n\n        const rows = [...this.rows$.getValue()];\n        const index = rows.indexOf(parent);\n\n        if (index < 0) {\n            return;\n        }\n\n        while (index + 1 < rows.length && rows[index + 1].state.level > parent.state.level) {\n            rows.splice(index + 1, 1);\n        }\n\n        this.rows$.next(rows);\n    }\n}\n"]}