dialogs/FBDVariableDialog.py
author Andrey Skvortsov <andrej.skvortzov@gmail.com>
Tue, 10 Oct 2017 13:49:13 +0300
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child 1878 fb73a6b6622d
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fix pylint warning '(misplaced-bare-raise) The raise statement is not inside an except clause'
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#!/usr/bin/env python
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# -*- coding: utf-8 -*-
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# This file is part of Beremiz, a Integrated Development Environment for
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# programming IEC 61131-3 automates supporting plcopen standard and CanFestival.
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#
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# Copyright (C) 2007: Edouard TISSERANT and Laurent BESSARD
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# Copyright (C) 2017: Andrey Skvortsov <andrej.skvortzov@gmail.com>
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#
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# See COPYING file for copyrights details.
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License
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# as published by the Free Software Foundation; either version 2
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# of the License, or (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
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from __future__ import absolute_import
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import wx
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from graphics.GraphicCommons import INPUT, INOUT, OUTPUT
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from graphics.FBD_Objects import FBD_Variable
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from dialogs.BlockPreviewDialog import BlockPreviewDialog
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# -------------------------------------------------------------------------------
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#                                    Helpers
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# -------------------------------------------------------------------------------
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# Dictionaries containing correspondence between variable block class and string
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# to be shown in Class combo box in both sense
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VARIABLE_CLASSES_DICT = {
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    INPUT:  _("Input"),
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    INOUT:  _("InOut"),
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    OUTPUT: _("Output")
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}
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VARIABLE_CLASSES_DICT_REVERSE = dict(
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    [(value, key) for key, value in VARIABLE_CLASSES_DICT.iteritems()])
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# -------------------------------------------------------------------------------
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#                        Set Variable Parameters Dialog
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# -------------------------------------------------------------------------------
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class FBDVariableDialog(BlockPreviewDialog):
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    """
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    Class that implements a dialog for defining parameters of a FBD variable graphic
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    element
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    """
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    def __init__(self, parent, controller, tagname, exclude_input=False):
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        """
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        Constructor
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        @param parent: Parent wx.Window of dialog for modal
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        @param controller: Reference to project controller
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        @param tagname: Tagname of project POU edited
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        @param exclude_input: Exclude input from variable class selection
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        """
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        BlockPreviewDialog.__init__(self, parent, controller, tagname,
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                                    title=_('Variable Properties'))
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        # Init common sizers
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        self._init_sizers(4, 2, 4, None, 3, 2)
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        # Create label for variable class
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        class_label = wx.StaticText(self, label=_('Class:'))
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        self.LeftGridSizer.AddWindow(class_label, flag=wx.GROW)
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        # Create a combo box for defining variable class
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        self.Class = wx.ComboBox(self, style=wx.CB_READONLY)
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        self.Bind(wx.EVT_COMBOBOX, self.OnClassChanged, self.Class)
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        self.LeftGridSizer.AddWindow(self.Class, flag=wx.GROW)
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        # Create label for variable execution order
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        execution_order_label = wx.StaticText(self,
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                                              label=_('Execution Order:'))
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        self.LeftGridSizer.AddWindow(execution_order_label, flag=wx.GROW)
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        # Create spin control for defining variable execution order
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        self.ExecutionOrder = wx.SpinCtrl(self, min=0, style=wx.SP_ARROW_KEYS)
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        self.Bind(wx.EVT_SPINCTRL, self.OnExecutionOrderChanged,
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                  self.ExecutionOrder)
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        self.LeftGridSizer.AddWindow(self.ExecutionOrder, flag=wx.GROW)
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        # Create label for variable expression
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        name_label = wx.StaticText(self, label=_('Expression:'))
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        self.RightGridSizer.AddWindow(name_label, border=5,
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                                      flag=wx.GROW | wx.BOTTOM)
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        # Create text control for defining variable expression
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        self.Expression = wx.TextCtrl(self)
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        self.Bind(wx.EVT_TEXT, self.OnExpressionChanged, self.Expression)
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        self.RightGridSizer.AddWindow(self.Expression, flag=wx.GROW)
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        # Create a list box to selected variable expression in the list of
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        # variables defined in POU
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        self.VariableName = wx.ListBox(self, size=wx.Size(-1, 120),
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                                       style=wx.LB_SINGLE | wx.LB_SORT)
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        self.Bind(wx.EVT_LISTBOX, self.OnNameChanged, self.VariableName)
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        self.RightGridSizer.AddWindow(self.VariableName, border=4, flag=wx.GROW | wx.TOP)
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        # Add preview panel and associated label to sizers
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        self.MainSizer.AddWindow(self.PreviewLabel, border=20,
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                                 flag=wx.GROW | wx.LEFT | wx.RIGHT)
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        self.MainSizer.AddWindow(self.Preview, border=20,
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                                 flag=wx.GROW | wx.LEFT | wx.RIGHT)
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        # Add buttons sizer to sizers
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        self.MainSizer.AddSizer(
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            self.ButtonSizer, border=20,
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            flag=wx.ALIGN_RIGHT | wx.BOTTOM | wx.LEFT | wx.RIGHT)
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        # Set options that can be selected in class combo box
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        for var_class, choice in VARIABLE_CLASSES_DICT.iteritems():
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            if not exclude_input or var_class != INPUT:
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                self.Class.Append(choice)
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        self.Class.SetSelection(0)
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        # Extract list of variables defined in POU
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        self.RefreshVariableList()
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        # Refresh values in name list box
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        self.RefreshNameList()
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        self.Preview.SetInitialSize(wx.Size(-1, 60))
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        self.Fit()
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        # Class combo box is default control having keyboard focus
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        self.Class.SetFocus()
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    def RefreshNameList(self):
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        """
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        Called to refresh names in name list box
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        """
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        # Get variable class to select POU variable applicable
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        var_class = VARIABLE_CLASSES_DICT_REVERSE[
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                            self.Class.GetStringSelection()]
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        # Refresh names in name list box by selecting variables in POU variables
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        # list that can be applied to variable class
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        self.VariableName.Clear()
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        for name, (var_type, _value_type) in self.VariableList.iteritems():
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            if var_type != "Input" or var_class == INPUT:
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                self.VariableName.Append(name)
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        # Get variable expression and select corresponding value in name list
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        # box if it exists
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        selected = self.Expression.GetValue()
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        if selected != "" and self.VariableName.FindString(selected) != wx.NOT_FOUND:
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            self.VariableName.SetStringSelection(selected)
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        else:
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            self.VariableName.SetSelection(wx.NOT_FOUND)
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        # Disable name list box if no name present inside
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        self.VariableName.Enable(self.VariableName.GetCount() > 0)
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    def SetValues(self, values):
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        """
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        Set default variable parameters
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        @param values: Variable parameters values
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        """
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        # Get class parameter value
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        var_class = values.get("class", None)
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        if var_class is not None:
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            # Set class selected in class combo box
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            self.Class.SetStringSelection(VARIABLE_CLASSES_DICT[var_class])
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            # Refresh names in name list box according to var class
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            self.RefreshNameList()
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        # For each parameters defined, set corresponding control value
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        for name, value in values.items():
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            # Parameter is variable expression
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            if name == "expression":
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                # Set expression text control value
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                self.Expression.ChangeValue(value)
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                # Select corresponding text in name list box if it exists
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                if self.VariableName.FindString(value) != wx.NOT_FOUND:
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                    self.VariableName.SetStringSelection(value)
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                else:
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                    self.VariableName.SetSelection(wx.NOT_FOUND)
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            # Parameter is variable execution order
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            elif name == "executionOrder":
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                self.ExecutionOrder.SetValue(value)
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        # Refresh preview panel
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        self.RefreshPreview()
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        self.Fit()
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    def GetValues(self):
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        """
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        Return block parameters defined in dialog
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        @return: {parameter_name: parameter_value,...}
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        """
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        expression = self.Expression.GetValue()
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        values = {
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            "class": VARIABLE_CLASSES_DICT_REVERSE[
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                        self.Class.GetStringSelection()],
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            "expression": expression,
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            "var_type": self.VariableList.get(expression, (None, None))[1],
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            "executionOrder": self.ExecutionOrder.GetValue()}
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        values["width"], values["height"] = self.Element.GetSize()
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        return values
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    def OnOK(self, event):
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        """
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        Called when dialog OK button is pressed
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        Test if parameters defined are valid
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        @param event: wx.Event from OK button
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        """
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        message = None
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        # Test that an expression have been selected or typed by user
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        value = self.Expression.GetValue()
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        if value == "":
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            message = _("At least a variable or an expression must be selected!")
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        # Show error message if an error is detected
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        if message is not None:
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            self.ShowErrorMessage(message)
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        else:
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            # Call BlockPreviewDialog function
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            BlockPreviewDialog.OnOK(self, event)
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    def OnClassChanged(self, event):
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        """
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        Called when variable class value changed
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        @param event: wx.ComboBoxEvent
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        """
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        # Refresh name list box values
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        self.RefreshNameList()
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        self.RefreshPreview()
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        event.Skip()
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    def OnNameChanged(self, event):
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        """
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        Called when name selected in name list box changed
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        @param event: wx.ListBoxEvent
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        """
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        # Change expression test control value to the value selected in name
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        # list box if value selected is valid
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        if self.VariableName.GetSelection() != wx.NOT_FOUND:
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            self.Expression.ChangeValue(self.VariableName.GetStringSelection())
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        self.RefreshPreview()
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        event.Skip()
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    def OnExpressionChanged(self, event):
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        """
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        Called when expression text control is changed by user
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        @param event: wx.ListBoxEvent
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        """
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        # Select the corresponding value in name list box if it exists
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        self.VariableName.SetSelection(
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            self.VariableName.FindString(self.Expression.GetValue()))
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        self.RefreshPreview()
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        event.Skip()
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    def OnExecutionOrderChanged(self, event):
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        """
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        Called when block execution control value changed
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        @param event: wx.SpinEvent
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        """
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        self.RefreshPreview()
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        event.Skip()
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    def RefreshPreview(self):
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        """
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        Refresh preview panel of graphic element
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        Override BlockPreviewDialog function
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        """
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        # Get expression value to put in FBD variable element
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        name = self.Expression.GetValue()
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        # Set graphic element displayed, creating a FBD variable element
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        self.Element = FBD_Variable(
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            self.Preview,
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            VARIABLE_CLASSES_DICT_REVERSE[self.Class.GetStringSelection()],
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            name,
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            self.VariableList.get(name, ("", ""))[1],
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            executionOrder=self.ExecutionOrder.GetValue())
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        # Call BlockPreviewDialog function
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        BlockPreviewDialog.RefreshPreview(self)