comparison src/app/waveform/waveform.component.ts @ 16:7e3ab6f8792f

Rough waveform loading, issues exist regarding communicating changes from child components (unless using the current workaround with explicit zone running)... investigating.

 import {
   Component, OnInit, ViewChild, ElementRef,
-  AfterViewInit
+  AfterViewInit, OnChanges, SimpleChanges, Input
 } from '@angular/core';
 
-declare var wavesUI: any;
+declare var wavesUI: any; // TODO non-global app scope import
 
 @Component({
   selector: 'app-waveform',
   templateUrl: './waveform.component.html',
   styleUrls: ['./waveform.component.css']
 })
-export class WaveformComponent implements OnInit, AfterViewInit {
+export class WaveformComponent implements OnInit, AfterViewInit, OnChanges {
   @ViewChild('track') trackDiv: ElementRef;
 
+  private _audioBuffer: AudioBuffer = undefined;
+
+  @Input()
+  set audioBuffer(buffer: AudioBuffer) {
+    console.log("setter");
+    this._audioBuffer = buffer || undefined;
+  }
+
+  get audioBuffer(): AudioBuffer {
+    return this._audioBuffer;
+  }
+
+
+
+  private timeline: any; // TODO what type is it?
+
   constructor() {
-    console.log(wavesUI.core);
   }
 
   ngOnInit() {}
 
   ngAfterViewInit(): void {
+    // const track: HTMLElement = this.trackDiv.nativeElement;
+    // const duration: number = 1.0;
+    // const height: number = track.getBoundingClientRect().height;
+    // const width: number = track.getBoundingClientRect().width;
+    // const pixelsPerSecond = width / duration;
+    // const timeline = new wavesUI.core.Timeline(pixelsPerSecond, width);
+    // timeline.createTrack(track, height, 'main');
+    //
+    // // time axis
+    // const timeAxis = new wavesUI.helpers.TimeAxisLayer({
+    //   height: height,
+    //   top: 10,
+    //   color: 'gray'
+    // });
+    //
+    // timeline.addLayer(timeAxis, 'main', 'default', true);
+    // timeline.state = new wavesUI.states.CenteredZoomState(timeline);
+  }
+
+  ngOnChanges(changes: SimpleChanges): void {
+    console.log("ng changes");
+    if (changes.hasOwnProperty("audioBuffer")) { // why wouldn't it?
+      if (changes["audioBuffer"].currentValue)
+        this.renderWaveform(changes["audioBuffer"].currentValue);
+    }
+  }
+
+  renderWaveform(buffer: AudioBuffer) {
+    // TODO reduce dupe from original timeline state, anyway to actually not instantiate new timeline?
+    console.log("render wave");
     const track: HTMLElement = this.trackDiv.nativeElement;
-    const duration: number = 1.0;
+    const duration: number = buffer.duration;
     const height: number = track.getBoundingClientRect().height;
     const width: number = track.getBoundingClientRect().width;
     const pixelsPerSecond = width / duration;
-    const timeline: any = new wavesUI.core.Timeline(pixelsPerSecond, width);
+    const timeline = new wavesUI.core.Timeline(pixelsPerSecond, width);
     timeline.createTrack(track, height, 'main');
+
     // time axis
     const timeAxis = new wavesUI.helpers.TimeAxisLayer({
       height: height,
       top: 10,
       color: 'gray'
     });
+
     timeline.addLayer(timeAxis, 'main', 'default', true);
     timeline.state = new wavesUI.states.CenteredZoomState(timeline);
+    // TODO dispose of the existing layer?
+    const waveformLayer = new wavesUI.helpers.WaveformLayer(buffer, {
+      height: 600,
+      color: 'darkblue'
+    });
+    timeline.addLayer(waveformLayer, 'main');
   }
+
 }