✨ | Add ability to load previous track

gui.py

@@ -972,7 +972,8 @@ class PlaybackBar(QWidget):
                 "QPushButton:hover { color: #ffffff; }"
             ),
         }
-        btn_base = icon_style["normal"] + icon_style["hover"]
+        self._btn_base = icon_style["normal"] + icon_style["hover"]
+        btn_base = self._btn_base
 
         self._loop_btn = QPushButton("↻")
         self._loop_btn.setFixedSize(btn_size, btn_size)
@@ -986,13 +987,17 @@ class PlaybackBar(QWidget):
 
         self._prev_btn = QPushButton("⏮")
         self._prev_btn.setFixedSize(btn_size, btn_size)
-        self._prev_btn.setToolTip("Restart / Previous")
+        self._prev_btn.setToolTip("Previous")
         self._prev_btn.setStyleSheet(btn_base)
         self._prev_btn.clicked.connect(self._restart)
 
+        self._prev_btn.setEnabled(False)
+
         self._play_btn = QPushButton("▶")
         self._play_btn.setFixedSize(40, 40)
         self._play_btn.setToolTip("Play / Pause")
+
+        self._play_btn.setEnabled(False)
         self._play_btn.setStyleSheet(
             "QPushButton { background: #ffffff; border: none;"
             " border-radius: 20px; color: #0a0814;"
@@ -1008,6 +1013,8 @@ class PlaybackBar(QWidget):
         self._next_btn.setStyleSheet(btn_base)
         self._next_btn.clicked.connect(self._next)
 
+        self._next_btn.setEnabled(False)
+
         self._stop_btn = QPushButton("⏹")
         self._stop_btn.setFixedSize(btn_size, btn_size)
         self._stop_btn.setToolTip("Stop")
@@ -1017,6 +1024,8 @@ class PlaybackBar(QWidget):
         )
         self._stop_btn.clicked.connect(self._stop)
 
+        self._stop_btn.setEnabled(False)
+
         btn_row.addWidget(self._loop_btn)
         btn_row.addWidget(self._prev_btn)
         btn_row.addStretch()
@@ -1024,6 +1033,19 @@ class PlaybackBar(QWidget):
         btn_row.addStretch()
         btn_row.addWidget(self._next_btn)
         btn_row.addWidget(self._stop_btn)
+
+        self._disabled_style = """
+            QPushButton { background: transparent; border: none;
+            color: #44445a; font-size: 15pt; }
+        """
+        self._disabled_extra = """
+            QPushButton { background: transparent; border: none;
+            color: #44445a; font-size: 15pt; }
+            QPushButton:hover { color: #44445a; }
+        """
+        self._disabled_loop_checked = """
+            QPushButton:checked { color: #44445a; }
+        """
         center_layout.addLayout(btn_row)
 
         # ── Progress bar ──
@@ -1263,8 +1285,34 @@ class PlaybackBar(QWidget):
         self._player.set_loop(enabled)
         self._loop_btn.setChecked(enabled)
 
+    def set_buttons_enabled(self, enabled: bool) -> None:
+        """Enable or disable playback control buttons."""
+        if enabled:
+            normal = self._btn_base
+            loop_checked = "QPushButton:checked { color: #a78bfa; }"
+        else:
+            normal = self._disabled_extra
+            loop_checked = self._disabled_loop_checked
+        self._prev_btn.setEnabled(enabled)
+        self._prev_btn.setStyleSheet(normal)
+        self._play_btn.setEnabled(enabled)
+        self._next_btn.setEnabled(enabled)
+        self._next_btn.setStyleSheet(normal)
+        self._stop_btn.setEnabled(enabled)
+        self._stop_btn.setStyleSheet(normal)
+        self._loop_btn.setEnabled(enabled)
+        if enabled:
+            self._loop_btn.setStyleSheet(self._btn_base + loop_checked)
+        else:
+            self._loop_btn.setStyleSheet(self._disabled_style + loop_checked)
+        self._vol_slider.setEnabled(enabled)
+        self._vol_btn.setEnabled(enabled)
+
     def _restart(self) -> None:
-        self._player.seek(0)
+        if self._player.has_previous() and self._player.get_position() < 3000:
+            self._player.previous()
+        else:
+            self._player.seek(0)
 
     def _next(self) -> None:
         self._player.skip()
@@ -2214,6 +2262,7 @@ class TunettiWindow(QMainWindow):
         self.player.playback_state_changed.connect(self._on_playback_state_changed)
         self.player.error.connect(self._on_player_error)
         self.player.seeked.connect(self._on_player_seeked)
+        self.player.song_loaded.connect(self._on_song_loaded)
 
         # ── Visualizer audio buffer input ──
         # Connect the player's audio buffer output to our visualizer
@@ -2714,6 +2763,10 @@ class TunettiWindow(QMainWindow):
         log.error("Player error: %s", err.get("error", "unknown"))
         self._playback.show_error(err.get("error", "Playback error"))
 
+    @Slot(bool)
+    def _on_song_loaded(self, loaded: bool) -> None:
+        self._playback.set_buttons_enabled(loaded)
+
     @Slot(int)
     def _on_player_seeked(self, position_ms: int) -> None:
         """Recalculate Discord RPC start timestamp after a seek."""