Deleted some unnecessary shit and finally found an easy way to figure out which tracks got dragged.

wobuzz/ui/playlist.py

@@ -1,11 +1,20 @@
 #!/usr/bin/python3
 
-from PyQt6.QtWidgets import QTreeWidget
+from PyQt6.QtCore import pyqtSignal
+from PyQt6.QtGui import QDropEvent
+from PyQt6.QtWidgets import QTreeWidget, QAbstractItemView
 
 
 class PlaylistView(QTreeWidget):
-    def __init__(self, *args, **kwargs):
-        super().__init__(*args, **kwargs)
+    itemDropped = pyqtSignal(QTreeWidget, list)
+
+    def __init__(self, playlist, parent=None):
+        super().__init__(parent)
+
+        self.playlist = playlist
+
+        self.setDragDropMode(QAbstractItemView.DragDropMode.InternalMove)
+        self.setSelectionMode(QAbstractItemView.SelectionMode.ExtendedSelection)
 
         self.setColumnCount(4)
 
@@ -18,4 +27,17 @@ class PlaylistView(QTreeWidget):
             "# Custom Sorting"
         ]
 
-        self.setHeaderLabels(headers)
+        self.setHeaderLabels(headers)
+
+    def update_track_numbers(self):
+        pass
+
+    def dropEvent(self, event: QDropEvent):
+        items = self.selectedItems()  # dragged items are always selected items
+
+        self.itemDropped.emit(self, items)
+
+        super().dropEvent(event)
+
+        event.accept()
+