truly-ui
Version:
Web Components for Desktop Applications.
110 lines (108 loc) • 14 kB
JavaScript
/*
MIT License
Copyright (c) 2019 Temainfo Sistemas
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in all
copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
SOFTWARE.
*/
import { DataSource } from '@angular/cdk/collections';
import { BehaviorSubject, Subscription, Subject } from 'rxjs';
export class DataSourceList extends DataSource {
constructor(config) {
super();
this.config = config;
this.loadMoreData = new Subject();
this.totalLength = 0;
this.pageSize = 0;
this.lazyMode = false;
this.fetchedPages = new Set();
this.cachedData = [];
this.subscription = new Subscription();
this.arrayTotal = [];
this.currentPage = 0;
this.setProprieties(config);
this.cachedData = this.config.dataSource;
this.dataStream = new BehaviorSubject(this.arrayTotal);
this.resetData();
}
connect(collectionViewer) {
this.subscription.add(collectionViewer.viewChange.subscribe(range => {
const startPage = this.getPageForIndex(range.start);
const endPage = this.getPageForIndex(range.end - 1);
for (let i = startPage; i <= endPage; i++) {
this.fetchPage(i);
}
}));
return this.dataStream;
}
disconnect() {
// this.subscription.unsubscribe();
}
unsubscribe() {
this.subscription.unsubscribe();
}
addPage(page) {
this.fetchedPages.add(page);
}
setArray(value) {
this.arrayTotal.length = value;
this.dataStream.next(this.arrayTotal);
}
resetData() {
this.arrayTotal = Array.from({ length: this.totalLength });
this.dataStream.next(this.arrayTotal);
}
resetPages() {
this.fetchedPages.clear();
}
setProprieties(config) {
Object.keys(config).forEach((value) => {
this[value] = config[value];
});
}
getCachedData() {
return this.cachedData;
}
setData(data) {
this.cachedData = data;
this.arrayTotal.splice(this.currentPage * this.pageSize, this.pageSize, ...data);
this.dataStream.next(this.arrayTotal);
if (data.length === this.pageSize) {
if (!this.fetchedPages.has(0)) {
this.fetchedPages.add(0);
}
}
}
getPageForIndex(index) {
return Math.floor(index / this.pageSize);
}
emitCachedData(skip) {
this.cachedData.slice(skip, this.pageSize);
this.dataStream.next(this.cachedData);
}
emitLoadData(skip) {
this.loadMoreData.next({ skip: skip, limit: this.pageSize + skip });
}
fetchPage(page) {
this.currentPage = page;
if (this.fetchedPages.has(page)) {
return;
}
this.addPage(page);
const skip = page * this.pageSize;
!this.lazyMode ? this.emitCachedData(skip) : this.emitLoadData(skip);
}
}
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IN NO EVENT SHALL THE\n AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER\n LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,\n OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE\n SOFTWARE.\n */\nimport { CollectionViewer, DataSource } from '@angular/cdk/collections';\nimport { BehaviorSubject, Observable, Subscription, Subject } from 'rxjs';\nimport { DataSourceInterface } from '../interfaces/datasource-list.interface';\n\nexport class DataSourceList extends DataSource<string | undefined> {\n\n  public dataStream: BehaviorSubject<any>;\n\n  public loadMoreData = new Subject();\n\n  private totalLength = 0;\n\n  private pageSize = 0;\n\n  private lazyMode = false;\n\n  private fetchedPages = new Set<number>();\n\n  private cachedData = [];\n\n  private subscription = new Subscription();\n\n  private arrayTotal = [];\n\n  private currentPage = 0;\n\n  constructor( public config: DataSourceInterface ) {\n    super();\n    this.setProprieties(config);\n    this.cachedData = this.config.dataSource;\n    this.dataStream = new BehaviorSubject<(any | undefined)[]>( this.arrayTotal );\n    this.resetData();\n  }\n\n  connect( collectionViewer?: CollectionViewer ): Observable<(string | undefined)[]> {\n    this.subscription.add( collectionViewer.viewChange.subscribe( range => {\n      const startPage = this.getPageForIndex( range.start );\n      const endPage = this.getPageForIndex( range.end - 1 );\n      for ( let i = startPage; i <= endPage; i++ ) {\n        this.fetchPage( i );\n      }\n    } ) );\n    return this.dataStream;\n  }\n\n  disconnect(): void {\n    // this.subscription.unsubscribe();\n  }\n\n  unsubscribe() {\n    this.subscription.unsubscribe();\n  }\n\n  addPage(page: number) {\n    this.fetchedPages.add( page );\n  }\n\n  public setArray( value ) {\n    this.arrayTotal.length = value;\n    this.dataStream.next( this.arrayTotal );\n  }\n\n  public resetData() {\n    this.arrayTotal = Array.from<string>({length: this.totalLength });\n    this.dataStream.next( this.arrayTotal );\n  }\n\n  public resetPages() {\n    this.fetchedPages.clear();\n  }\n\n  private setProprieties(config) {\n    Object.keys(config).forEach((value) => {\n      this[value] = config[value];\n    });\n  }\n\n  public getCachedData() {\n    return this.cachedData;\n  }\n\n  public setData(data: Array<any>) {\n    this.cachedData = data;\n    this.arrayTotal.splice(this.currentPage * this.pageSize, this.pageSize, ...data);\n    this.dataStream.next( this.arrayTotal );\n    if ( data.length === this.pageSize) {\n      if ( !this.fetchedPages.has(0) ) {\n        this.fetchedPages.add(0);\n      }\n    }\n  }\n\n  private getPageForIndex( index: number ): number {\n    return Math.floor( index / this.pageSize );\n  }\n\n  private emitCachedData(skip: number) {\n    this.cachedData.slice( skip, this.pageSize );\n    this.dataStream.next( this.cachedData );\n  }\n\n  private emitLoadData(skip: number) {\n    this.loadMoreData.next( { skip: skip, limit: this.pageSize + skip } );\n  }\n\n  private fetchPage( page: number ) {\n    this.currentPage = page;\n    if ( this.fetchedPages.has( page ) ) {\n      return;\n    }\n    this.addPage(page);\n    const skip = page * this.pageSize;\n    !this.lazyMode ? this.emitCachedData(skip) : this.emitLoadData(skip);\n  }\n\n}\n"]}