implement play/pause and volume control

src/main.rs

@@ -1,7 +1,7 @@
 use gio::prelude::*;
 use gtk::prelude::*;
 use gtk::Orientation;
-use rodio::Source;
+use rodio::Sink;
 use std::env::args;
 use std::fs::File;
 use std::io::BufReader;
@@ -44,7 +44,9 @@ fn build_ui(application: &gtk::Application) {
         let source = rodio::Decoder::new(BufReader::new(file))
             .expect("Couldn't decode audio");
 
-        rodio::play_raw(&device, source.convert_samples());
+        let sink = Sink::new(&device);
+        sink.append(source);
+        sink.pause();
 
         let row = gtk::Box::new(Orientation::Horizontal, SPACING);
         row.set_homogeneous(true);
@@ -68,6 +70,18 @@ fn build_ui(application: &gtk::Application) {
 
         slider.set_draw_value(false);
 
+        slider.connect_value_changed(move |scale| {
+            let volume = scale.get_value();
+            println!("volume: {}", volume);
+
+            if volume == 0. {
+                sink.pause();
+            } else {
+                sink.play();
+                sink.set_volume(volume as f32);
+            }
+        });
+
         row.add(&slider);
 
         vertical.add(&row);