fix: do not allow move of bed plane (#148)

src/locales.py

@@ -144,6 +144,7 @@ class Locale:
     WarningPathNotClosed = "When cutting the model, not closed areas were found! Check that the shapes are positioned correctly"
 
     RemoveFirstPlaneError = "First figure cannot be removed"
+    CannotDropHere = "Figure cannot be dropped here"
 
     def __init__(self, **entries):
         self.__dict__.update(entries)
@@ -295,6 +296,7 @@ def __init__(self, **entries):
         M10CutDistance="Дистанция отреза филамента, мм:",
         RemoveFirstPlaneError="Первая фигура не может быть убрана",
         WarningPathNotClosed="При разрезании модели были обнаружены незамкнутые участки! Проверьте корректность расположения фигур",
+        CannotDropHere="Фигура не может быть перенесена сюда",
     ),
 }
 

src/window.py

@@ -29,7 +29,7 @@
 
 from src import locales, gui_utils, interactor_style
 from src.InteractorAroundActivePlane import InteractionAroundActivePlane
-from src.gui_utils import plane_tf, Plane, Cone
+from src.gui_utils import plane_tf, Plane, Cone, showErrorDialog
 from src.settings import (
     sett,
     get_color,
@@ -70,10 +70,28 @@ def __init__(self, parent=None):
         self.setDropIndicatorShown(True)
         self.setAcceptDrops(True)
 
-    def dragMoveEvent(self, event):
+    def dragEnterEvent(self, e: QtGui.QDragEnterEvent) -> None:
+        # we cannot start dragging the first row
+        item = self.selectedItems()[0]
+        idx = self.indexFromItem(item)
+        if idx.row() == 0:
+            e.ignore()
+            return
+
+        return super().dragEnterEvent(e)
+
+    def dragMoveEvent(self, event: QtGui.QDragMoveEvent) -> None:
         self.itemIsMoving = True
         super().dragMoveEvent(event)
 
+    def dropEvent(self, event):
+        # we cannot drop on the first row
+        if self.indexAt(event.pos()).row() == 0:
+            showErrorDialog(locales.getLocale().CannotDropHere)
+            return
+
+        super().dropEvent(event)
+
 
 class MainWindow(QMainWindow):
     from src.figure_editor import FigureEditor