StatusBar and Sidebar views update correctly

src/app/core/services/download.service.ts

@@ -1,6 +1,7 @@
 import { Injectable, EventEmitter } from '@angular/core'
 import { ElectronService } from './electron.service'
 import { Download, NewDownload } from '../../../electron/shared/interfaces/download.interface'
+import * as _ from 'underscore'
 
 @Injectable({
   providedIn: 'root'
@@ -8,17 +9,44 @@ import { Download, NewDownload } from '../../../electron/shared/interfaces/downl
 export class DownloadService {
 
   private downloadUpdatedEmitter = new EventEmitter<Download>()
+  private downloads: Download[] = []
 
   constructor(private electronService: ElectronService) { }
 
   addDownload(newDownload: NewDownload) {
     this.electronService.receiveIPC('download-updated', result => {
       this.downloadUpdatedEmitter.emit(result)
+
+      // Update <this.downloads> with result
+      const thisDownloadIndex = this.downloads.findIndex(download => download.versionID == result.versionID)
+      if (thisDownloadIndex == -1) {
+        this.downloads.push(result)
+      } else {
+        this.downloads[thisDownloadIndex] = result
+      }
     })
     this.electronService.sendIPC('add-download', newDownload)
   }
 
   onDownloadUpdated(callback: (download: Download) => void) {
-    this.downloadUpdatedEmitter.subscribe(callback)
+    this.downloadUpdatedEmitter.subscribe(_.throttle(callback, 30))
+  }
+
+  get downloadCount() {
+    return this.downloads.length
+  }
+
+  removeDownload(versionID: number) {
+    const removedDownload = this.downloads.find(download => download.versionID == versionID)
+    this.downloads = this.downloads.filter(download => download.versionID != versionID)
+    this.downloadUpdatedEmitter.emit(removedDownload)
+  }
+
+  get totalPercent() {
+    let total = 0
+    for (const download of this.downloads) {
+      total += download.percent
+    }
+    return total / this.downloads.length
   }
 }