Outsource list-statistic stuff

src/app/components/shared/statistics/statistics.component.ts

 import { Component, OnInit } from '@angular/core';
 import { ActivatedRoute } from '@angular/router';
 import { RoomService } from '../../../services/http/room.service';
-import { Content } from '../../../models/content';
-import { ContentService } from '../../../services/http/content.service';
 import { ContentGroup } from '../../../models/content-group';
 import { Room } from '../../../models/room';
 
 /* TODO: Use TranslateService */
-export interface ContentPercents {
-  content: string;
-  percent: string;
-}
 
 @Component({
   selector: 'app-statistics',
@@ -20,32 +14,16 @@ export interface ContentPercents {
 
 export class StatisticsComponent implements OnInit {
 
-  contents: string[] = ['TEST', 'TEST'];
   room: Room;
   contentGroups: ContentGroup[];
-  contentGroup: ContentGroup = new ContentGroup('Choice', ['53d8dc160260a1724b7c9930ed00102c', '53d8dc160260a1724b7c9930ed000b38'], true);
-  percents: number[];
-  displayedColumns = ['content', 'percentage'];
-  dataSource: ContentPercents[] = [
-    { content: '', percent: '' },
-    { content: '', percent: '' },
-    { content: '', percent: '' }
-  ];
 
   constructor(
     private route: ActivatedRoute,
-    private roomService: RoomService,
-    private contentService: ContentService) {
+    private roomService: RoomService) {
   }
 
   ngOnInit(): void {
     this.getRoom(localStorage.getItem('roomId'));
-    this.getContents();
-    this.percents = [73, 87, 69, 92, 77];
-    for (let i = 0; i < 2; i++) {
-      this.dataSource[i].content = this.contents[i];
-      this.dataSource[i].percent = this.percents[i].toFixed(0);
-    }
   }
 
   getRoom(id: string): void {
@@ -54,14 +32,6 @@ export class StatisticsComponent implements OnInit {
     });
   }
 
-  getContents(): void {
-  this.contentService.getContentsByIds(this.contentGroup.contentIds).subscribe( contents => {
-    for (let i = 0; i < 2; i++) {
-      this.contents[i] = contents[i].subject;
-    }
-    });
-  }
-
 }
   /*