betterify ux

src/playbin.vala

@@ -35,6 +35,7 @@ class Playbin : GLib.Object {
     // sent when a new song starts playing
     // continues: whether the track is a gapless continuation
     public signal void now_playing (bool continues, uint index, Song song);
+    public signal void stopped ();
 
     // the index of the track in the play queue that is currently playing
     // must equal play queue len iff state is STOPPED
@@ -136,7 +137,8 @@ class Playbin : GLib.Object {
             if (this.update_position) {
                 int64 new_position;
                 if (this.playbin.query_position (Gst.Format.TIME, out new_position)) {
-                    this.position = new_position;
+                    if (new_position > this.duration) this.position = this.duration;
+                    else this.position = new_position;
                 } else {
                     this.position = 0;
                 }
@@ -207,7 +209,7 @@ class Playbin : GLib.Object {
         });
         
         bus.message["eos"].connect ((message) => {
-            assert (false); // TODO
+            this.stop ();
         });
     }
 
@@ -257,5 +259,9 @@ class Playbin : GLib.Object {
         this.playbin.set_state (Gst.State.READY);
         this.state = PlaybinState.STOPPED;
         this.current_position = this.play_queue.get_n_items ();
+        this.stopped ();
+        
+        this.position = 0;
+        this.duration = 1;
     }
 }

src/ui/play_queue.vala

@@ -85,7 +85,7 @@ public class PlayQueueSelection : GLib.Object, GLib.ListModel, Gtk.SelectionMode
 
         if (this.current_position >= position) {
             if (this.current_position < position+removed && added == 0) {
-                emit_signal = true;
+                if (position < this.get_n_items ()) emit_signal = true;
                 this.current_position = position;
             } else {
                 this.current_position += added;
@@ -154,6 +154,7 @@ public class PlayQueueSelection : GLib.Object, GLib.ListModel, Gtk.SelectionMode
     // GLib.ListModel methods
 
     Object? get_item (uint position) {
+        if (this.model == null) return null;
         return this.model.get_item (position);
     }
 
@@ -162,6 +163,7 @@ public class PlayQueueSelection : GLib.Object, GLib.ListModel, Gtk.SelectionMode
     }
 
     uint get_n_items () {
+        if (this.model == null) return 0;
         return this.model.get_n_items ();
     }
 }

src/ui/window.blp

@@ -103,21 +103,21 @@ template $UiWindow: Adw.ApplicationWindow {
           styles [ "heading" ]
           xalign: 0;
           halign: start;
-          label: bind template.song as <$Song>.title;
+          label: bind $song_title (template.song) as <string>;
           ellipsize: end;
         }
 
         Label {
           styles [ "caption" ]
           xalign: 0;
-          label: bind template.song as <$Song>.artist;
+          label: bind $song_artist (template.song) as <string>;
           ellipsize: end;
         }
 
         Label {
           styles [ "caption" ]
           xalign: 0;
-          label: bind template.song as <$Song>.album;
+          label: bind $song_album (template.song) as <string>;
           ellipsize: end;
         }
       }
@@ -144,6 +144,7 @@ template $UiWindow: Adw.ApplicationWindow {
             name: "seek-scale";
             orientation: horizontal;
             width-request: 400;
+            sensitive: bind $playbin_active (template.playbin as <$Playbin>.state as <$PlaybinState>) as <bool>;
 
             adjustment: Adjustment {
               lower: 0;

src/ui/window.vala

@@ -65,6 +65,10 @@ class Ui.Window : Adw.ApplicationWindow {
                 api.scrobble.begin (song.id);
                 this.play_queue.selection.playbin_select (position);
             });
+            this.playbin.stopped.connect (() => {
+                this.song = null;
+                this.play_queue.selection.playbin_select (this.play_queue_store.get_n_items ());
+            });
 
             this.play_queue.selection.user_selected.connect ((position) => {
                 this.playbin.select_track (position);
@@ -215,4 +219,16 @@ class Ui.Window : Adw.ApplicationWindow {
         if (new_position > this.playbin.duration) new_position = this.playbin.duration;
         this.seek_impl (new_position);
     }
+
+    [GtkCallback] private string song_title (Song? song) {
+        return song == null ? "" : song.title;
+    }
+
+    [GtkCallback] private string song_artist (Song? song) {
+        return song == null ? "" : song.artist;
+    }
+
+    [GtkCallback] private string song_album (Song? song) {
+        return song == null ? "" : song.album;
+    }
 }