UI: b/trackvolume.js: add data bubble with dB value

swesterfeld · swesterfeld · commit abf79e173acd · 2023-10-06T17:29:11.000+02:00
Signed-off-by: Stefan Westerfeld &lt;stefan@space.twc.de&gt;
diff --git a/ui/b/trackvolume.js b/ui/b/trackvolume.js
@@ -65,6 +65,13 @@ class BTrackVolume extends LitComponent {
   updated (changed_props)
   {
     this.update_value();
+    var db_value = 20 * Math.log10 (2*this.value**3);
+    var db_string;
+    if (this.value === 0)
+      db_string = "-" + "\u221E";
+    else
+      db_string = db_value.toFixed (1);
+    this.setAttribute ('data-bubble', "Volume " + db_string + " dB");
   }
   async update_value()
   {

Original file line number	Diff line number	Diff line change
`@@ -65,6 +65,13 @@ class BTrackVolume extends LitComponent {`
`65`	`65`	`updated (changed_props)`
`66`	`66`	`{`
`67`	`67`	`this.update_value();`
	`68`	`+ var db_value = 20 * Math.log10 (2this.value*3);`
	`69`	`+ var db_string;`
	`70`	`+ if (this.value === 0)`
	`71`	`+ db_string = "-" + "\u221E";`
	`72`	`+ else`
	`73`	`+ db_string = db_value.toFixed (1);`
	`74`	`+ this.setAttribute ('data-bubble', "Volume " + db_string + " dB");`
`68`	`75`	`}`
`69`	`76`	`async update_value()`
`70`	`77`	`{`