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

flatcamGUI/preferences/Tools2OptimalPrefGroupUI.py

@@ -0,0 +1,41 @@
+from PyQt5 import QtWidgets
+
+from flatcamGUI.GUIElements import FCSpinner
+from flatcamGUI.preferences.OptionsGroupUI import OptionsGroupUI
+
+
+class Tools2OptimalPrefGroupUI(OptionsGroupUI):
+    def __init__(self, decimals=4, parent=None):
+
+        super(Tools2OptimalPrefGroupUI, self).__init__(self)
+
+        self.setTitle(str(_("Optimal Tool Options")))
+        self.decimals = decimals
+
+        # ## Parameters
+        self.optlabel = QtWidgets.QLabel("<b>%s:</b>" % _("Parameters"))
+        self.optlabel.setToolTip(
+            _("A tool to find the minimum distance between\n"
+              "every two Gerber geometric elements")
+        )
+        self.layout.addWidget(self.optlabel)
+
+        grid0 = QtWidgets.QGridLayout()
+        self.layout.addLayout(grid0)
+        grid0.setColumnStretch(0, 0)
+        grid0.setColumnStretch(1, 1)
+
+        self.precision_sp = FCSpinner()
+        self.precision_sp.set_range(2, 10)
+        self.precision_sp.set_step(1)
+        self.precision_sp.setWrapping(True)
+
+        self.precision_lbl = QtWidgets.QLabel('%s:' % _("Precision"))
+        self.precision_lbl.setToolTip(
+            _("Number of decimals for the distances and coordinates in this tool.")
+        )
+
+        grid0.addWidget(self.precision_lbl, 0, 0)
+        grid0.addWidget(self.precision_sp, 0, 1)
+
+        self.layout.addStretch()