Refacto en sous fichiers pour la maintenabilité

src/controllers/window_dragger.py

@@ -0,0 +1,25 @@
+from PySide6 import QtGui
+from PySide6.QtCore import Qt
+from PySide6.QtWidgets import QMainWindow
+
+
+class WindowDragger:
+    # Permet de déplacer une fenêtre sans barre de titre.
+
+    def __init__(self, window: QMainWindow):
+        self._window   = window
+        self._drag_pos = None
+
+    def mouse_press(self, event: QtGui.QMouseEvent) -> None:
+        if event.button() == Qt.MouseButton.LeftButton:
+            self._drag_pos = (
+                event.globalPosition().toPoint()
+                - self._window.frameGeometry().topLeft()
+            )
+
+    def mouse_move(self, event: QtGui.QMouseEvent) -> None:
+        if event.buttons() & Qt.MouseButton.LeftButton and self._drag_pos is not None:
+            self._window.move(event.globalPosition().toPoint() - self._drag_pos)
+
+    def mouse_release(self, _event) -> None:
+        self._drag_pos = None