diff src/app/app.component.ts @ 456:7bb0bac6f8dc

Add export button for recordings and option to remove audio item (also removes all related analyses atm). Revokes associated object url for audio on removal. Will be problematic if the history is used for undo / redo.

--- a/src/app/app.component.ts	Thu Jun 29 20:09:11 2017 +0100
+++ b/src/app/app.component.ts	Thu Jun 29 20:11:14 2017 +0100
@@ -1,7 +1,8 @@
-import {Component, OnDestroy} from '@angular/core';
+import {Component, Inject, OnDestroy} from '@angular/core';
 import {
   AudioPlayerService,
-  AudioResourceError, AudioResource
+  AudioResourceError,
+  AudioResource
 } from './services/audio-player/audio-player.service';
 import {FeatureExtractionService} from './services/feature-extraction/feature-extraction.service';
 import {ExtractorOutputInfo} from './feature-extraction-menu/feature-extraction-menu.component';
@@ -10,10 +11,15 @@
 import {Subscription} from 'rxjs/Subscription';
 import {
   AnalysisItem,
+  isPendingAnalysisItem, isPendingRootAudioItem,
   isRootAudioItem,
-  Item, PendingAnalysisItem, PendingRootAudioItem, RootAudioItem
+  Item,
+  PendingAnalysisItem,
+  PendingRootAudioItem,
+  RootAudioItem
 } from './analysis-item/analysis-item.component';
 import {OnSeekHandler} from './playhead/PlayHeadHelpers';
+import {UrlResourceLifetimeManager} from './app.module';
 
 class PersistentStack<T> {
   private stack: T[];
@@ -60,6 +66,28 @@
     ];
   }
 
+  map<U>(transform: (value: T, index: number, array: T[]) => U): U[] {
+    return this.stack.map(transform);
+  }
+
+  reduce<U>(reducer: (previousValue: U,
+                      currentValue: T,
+                      currentIndex: number,
+                      array: T[]) => U,
+            initialValue: U): U {
+    return this.stack.reduce(reducer, initialValue);
+  }
+
+  remove(...indices: number[]) {
+    this.history.push([...this.stack]);
+    this.stack = this.stack.reduce((acc, item, i) => {
+      if (!indices.includes(i)) {
+        acc.push(item);
+      }
+      return acc;
+    }, [] as T[]);
+  }
+
   toIterable(): Iterable<T> {
     return this.stack;
   }
@@ -84,7 +112,10 @@
   constructor(private audioService: AudioPlayerService,
               private featureService: FeatureExtractionService,
               private iconRegistry: MdIconRegistry,
-              private sanitizer: DomSanitizer) {
+              private sanitizer: DomSanitizer,
+              @Inject(
+                'UrlResourceLifetimeManager'
+              ) private resourceManager: UrlResourceLifetimeManager) {
     this.analyses = new PersistentStack<AnalysisItem>();
     this.canExtract = false;
     this.nRecordings = 0;
@@ -144,7 +175,7 @@
     );
   }
 
-  onFileOpened(file: File | Blob) {
+  onFileOpened(file: File | Blob, createExportableItem = false) {
     this.canExtract = false;
     const url = this.audioService.loadAudio(file);
     // TODO is it safe to assume it is a recording?
@@ -165,7 +196,8 @@
       title: title,
       description: new Date().toLocaleString(),
       id: `${++this.countingId}`,
-      mimeType: file.type
+      mimeType: file.type,
+      isExportable: createExportableItem
     } as PendingRootAudioItem;
     this.rootAudioItem = pending as RootAudioItem; // TODO this is silly
 
@@ -223,6 +255,22 @@
     });
   }
 
+  removeItem(item: Item): void {
+    const indicesToRemove: number[] = this.analyses.reduce(
+      (toRemove, current, index) => {
+        if (isPendingAnalysisItem(current) && current.parent.id === item.id) {
+          toRemove.push(index);
+        } else if (item.id === current.id) {
+          toRemove.push(index);
+        }
+        return toRemove;
+      }, []);
+    if (isPendingRootAudioItem(item)) {
+      this.resourceManager.revokeUrlToResource(item.uri);
+    }
+    this.analyses.remove(...indicesToRemove);
+  }
+
   ngOnDestroy(): void {
     this.onAudioDataSubscription.unsubscribe();
     this.onProgressUpdated.unsubscribe();