Split up PreferencesUI.py into individual files for each class, then fixed the imports everywhere that broke because of this.

flatcamGUI/preferences/GerberPreferencesUI.py

@@ -0,0 +1,38 @@
+from PyQt5 import QtWidgets
+
+from flatcamGUI.preferences.GerberEditorPrefGroupUI import GerberEditorPrefGroupUI
+from flatcamGUI.preferences.GerberExpPrefGroupUI import GerberExpPrefGroupUI
+from flatcamGUI.preferences.GerberAdvOptPrefGroupUI import GerberAdvOptPrefGroupUI
+from flatcamGUI.preferences.GerberOptPrefGroupUI import GerberOptPrefGroupUI
+from flatcamGUI.preferences.GerberGenPrefGroupUI import GerberGenPrefGroupUI
+
+
+class GerberPreferencesUI(QtWidgets.QWidget):
+
+    def __init__(self, decimals, parent=None):
+        QtWidgets.QWidget.__init__(self, parent=parent)
+        self.layout = QtWidgets.QHBoxLayout()
+        self.setLayout(self.layout)
+        self.decimals = decimals
+
+        self.gerber_gen_group = GerberGenPrefGroupUI(decimals=self.decimals)
+        self.gerber_gen_group.setMinimumWidth(250)
+        self.gerber_opt_group = GerberOptPrefGroupUI(decimals=self.decimals)
+        self.gerber_opt_group.setMinimumWidth(250)
+        self.gerber_exp_group = GerberExpPrefGroupUI(decimals=self.decimals)
+        self.gerber_exp_group.setMinimumWidth(230)
+        self.gerber_adv_opt_group = GerberAdvOptPrefGroupUI(decimals=self.decimals)
+        self.gerber_adv_opt_group.setMinimumWidth(200)
+        self.gerber_editor_group = GerberEditorPrefGroupUI(decimals=self.decimals)
+        self.gerber_editor_group.setMinimumWidth(200)
+
+        self.vlay = QtWidgets.QVBoxLayout()
+        self.vlay.addWidget(self.gerber_opt_group)
+        self.vlay.addWidget(self.gerber_exp_group)
+
+        self.layout.addWidget(self.gerber_gen_group)
+        self.layout.addLayout(self.vlay)
+        self.layout.addWidget(self.gerber_adv_opt_group)
+        self.layout.addWidget(self.gerber_editor_group)
+
+        self.layout.addStretch()