src/Mod/Fem/femtaskpanels/task_constraint_initialpressure.py

# ***************************************************************************
# *   Copyright (c) 2022 Uwe Stöhr <uwestoehr@lyx.org>                      *
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__title__ = "FreeCAD FEM constraint initial pressure task panel for the document object"
__author__ = "Uwe Stöhr"
__url__ = "https://www.freecad.org"

## @package task_constraint_initialpressure
#  \ingroup FEM
#  \brief task panel for constraint initial pressure object

import FreeCAD
import FreeCADGui
from femguiutils import selection_widgets

from femtools import membertools
from . import base_femtaskpanel


class _TaskPanel(base_femtaskpanel._BaseTaskPanel):

    def __init__(self, obj):
        super().__init__(obj)

        self._paramWidget = FreeCADGui.PySideUic.loadUi(
            FreeCAD.getHomePath() + "Mod/Fem/Resources/ui/InitialPressure.ui"
        )
        self._initParamWidget()

        # geometry selection widget
        # start with Solid in list!
        self._selectionWidget = selection_widgets.GeometryElementsSelection(
            obj.References, ["Solid", "Face"], True, False
        )

        # form made from param and selection widget
        self.form = [self._paramWidget, self._selectionWidget]

        analysis = obj.getParentGroup()
        self._mesh = None
        self._part = None
        if analysis is not None:
            self._mesh = membertools.get_single_member(analysis, "Fem::FemMeshObject")
        if self._mesh is not None:
            self._part = self._mesh.Shape
        self._partVisible = None
        self._meshVisible = None

    def open(self):
        if self._mesh is not None and self._part is not None:
            self._meshVisible = self._mesh.ViewObject.isVisible()
            self._partVisible = self._part.ViewObject.isVisible()
            self._mesh.ViewObject.hide()
            self._part.ViewObject.show()

    def reject(self):
        self._restoreVisibility()
        self._selectionWidget.finish_selection()
        return super().reject()

    def accept(self):
        if self.obj.References != self._selectionWidget.references:
            self.obj.References = self._selectionWidget.references
        self._applyWidgetChanges()
        self._selectionWidget.finish_selection()
        self._restoreVisibility()
        return super().accept()

    def _restoreVisibility(self):
        if self._mesh is not None and self._part is not None:
            if self._meshVisible:
                self._mesh.ViewObject.show()
            else:
                self._mesh.ViewObject.hide()
            if self._partVisible:
                self._part.ViewObject.show()
            else:
                self._part.ViewObject.hide()

    def _initParamWidget(self):
        self._paramWidget.pressureQSB.setProperty("value", self.obj.Pressure)
        FreeCADGui.ExpressionBinding(self._paramWidget.pressureQSB).bind(self.obj, "Pressure")

    def _applyWidgetChanges(self):
        pressure = None
        try:
            pressure = self._paramWidget.pressureQSB.property("value")
        except ValueError:
            FreeCAD.Console.PrintMessage(
                "Wrong input. Not recognised input: '{}' "
                "Pressure has not been set.\n".format(self._paramWidget.pressureQSB.text())
            )
        if pressure is not None:
            self.obj.Pressure = pressure