# ***************************************************************************
# *   Copyright (c) 2016 Bernd Hahnebach <bernd@bimstatik.org>              *
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# *   This file is part of the FreeCAD CAx development system.              *
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__title__ = "FreeCAD FEM mesh refinement task panel for the document object"
__author__ = "Bernd Hahnebach"
__url__ = "https://www.freecad.org"

## @package task_mesh_region
#  \ingroup FEM
#  \brief task panel for mesh refinement object

from PySide import QtCore

import FreeCAD
import FreeCADGui

from femguiutils import selection_widgets
from . import base_femtaskpanel


class _TaskPanel(base_femtaskpanel._BaseTaskPanel):
    """
    The TaskPanel for editing References property of FemMeshRegion objects
    """

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

        # parameter widget
        self.parameter_widget = FreeCADGui.PySideUic.loadUi(
            FreeCAD.getHomePath() + "Mod/Fem/Resources/ui/MeshRegion.ui"
        )
        QtCore.QObject.connect(
            self.parameter_widget.qsb_elelen,
            QtCore.SIGNAL("valueChanged(Base::Quantity)"),
            self.elelen_changed,
        )
        self.init_parameter_widget()

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

        # form made from param and selection widget
        self.form = [self.parameter_widget, self.selection_widget]

    def accept(self):
        self.obj.CharacteristicLength = self.elelen
        self.obj.References = self.selection_widget.references
        self.selection_widget.finish_selection()
        return super().accept()

    def reject(self):
        self.selection_widget.finish_selection()
        return super().reject()

    def init_parameter_widget(self):
        self.elelen = self.obj.CharacteristicLength
        FreeCADGui.ExpressionBinding(self.parameter_widget.qsb_elelen).bind(
            self.obj, "CharacteristicLength"
        )
        self.parameter_widget.qsb_elelen.setProperty("value", self.elelen)

    def elelen_changed(self, base_quantity_value):
        self.elelen = base_quantity_value