dialogs/BlockPreviewDialog.py
author Andrey Skvortsov <andrej.skvortzov@gmail.com>
Mon, 10 Apr 2017 18:29:12 +0300
changeset 1675 5f4e53508e4e
parent 1571 486f94a8032c
child 1696 8043f32de7b8
permissions -rw-r--r--
fix backtrace on opening program/resource on small screens

Fix regression introduced by f4696d8 ("add stretching to columns Name,
Type, Doc in variable panel").
This problem happens only on wxPython-3.0.
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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) 2013: Edouard TISSERANT and Laurent BESSARD
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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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import wx
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from plcopen.structures import TestIdentifier, IEC_KEYWORDS
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from graphics.GraphicCommons import FREEDRAWING_MODE
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#-------------------------------------------------------------------------------
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#                    Dialog with preview for graphic block
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#-------------------------------------------------------------------------------
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"""
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Class that implements a generic dialog containing a preview panel for displaying
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graphic created by dialog
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"""
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class BlockPreviewDialog(wx.Dialog):
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    def __init__(self, parent, controller, tagname, size, title):
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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 size: wx.Size object containing size of dialog
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        @param title: Title of dialog frame
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        """
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        wx.Dialog.__init__(self, parent, size=size, title=title)
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        # Save reference to
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        self.Controller = controller
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        self.TagName = tagname
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        # Label for preview
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        self.PreviewLabel = wx.StaticText(self, label=_('Preview:'))
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        # Create Preview panel
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        self.Preview = wx.Panel(self, style=wx.SIMPLE_BORDER)
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        self.Preview.SetBackgroundColour(wx.WHITE)
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        # Add function to preview panel so that it answers to graphic elements
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        # like Viewer
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        setattr(self.Preview, "GetDrawingMode", lambda:FREEDRAWING_MODE)
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        setattr(self.Preview, "GetScaling", lambda:None)
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        setattr(self.Preview, "GetBlockType", controller.GetBlockType)
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        setattr(self.Preview, "IsOfType", controller.IsOfType)
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        # Bind paint event on Preview panel
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        self.Preview.Bind(wx.EVT_PAINT, self.OnPaint)
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        # Add default dialog buttons sizer
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        self.ButtonSizer = self.CreateButtonSizer(wx.OK|wx.CANCEL|wx.CENTRE)
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        self.Bind(wx.EVT_BUTTON, self.OnOK, 
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                  self.ButtonSizer.GetAffirmativeButton())
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        self.Element = None            # Graphic element to display in preview
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        self.MinElementSize = None     # Graphic element minimal size
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        # Variable containing the graphic element name when dialog is opened
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        self.DefaultElementName = None
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        # List of variables defined in POU {var_name: (var_class, var_type),...}
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        self.VariableList = {}
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    def __del__(self):
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        """
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        Destructor
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        """
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        # Remove reference to project controller
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        self.Controller = None
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    def _init_sizers(self, main_rows, main_growable_row,
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                            left_rows, left_growable_row,
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                            right_rows, right_growable_row):
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        """
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        Initialize common sizers
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        @param main_rows: Number of rows in main sizer
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        @param main_growable_row: Row that is growable in main sizer, None if no
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        row is growable
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        @param left_rows: Number of rows in left grid sizer
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        @param left_growable_row: Row that is growable in left grid sizer, None
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        if no row is growable
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        @param right_rows: Number of rows in right grid sizer
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        @param right_growable_row: Row that is growable in right grid sizer,
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        None if no row is growable
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        """
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        # Create dialog main sizer
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        self.MainSizer = wx.FlexGridSizer(cols=1, hgap=0, 
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                                          rows=main_rows, vgap=10)
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        self.MainSizer.AddGrowableCol(0)
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        if main_growable_row is not None:
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            self.MainSizer.AddGrowableRow(main_growable_row)
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        # Create a sizer for dividing parameters in two columns
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        column_sizer = wx.BoxSizer(wx.HORIZONTAL)
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        self.MainSizer.AddSizer(column_sizer, border=20, 
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              flag=wx.GROW|wx.TOP|wx.LEFT|wx.RIGHT)
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        # Create a sizer for left column
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        self.LeftGridSizer = wx.FlexGridSizer(cols=1, hgap=0, 
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                                              rows=left_rows, vgap=5)
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        self.LeftGridSizer.AddGrowableCol(0)
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        if left_growable_row is not None:
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            self.LeftGridSizer.AddGrowableRow(left_growable_row)
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        column_sizer.AddSizer(self.LeftGridSizer, 1, border=5, 
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              flag=wx.GROW|wx.RIGHT)
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        # Create a sizer for right column
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        self.RightGridSizer = wx.FlexGridSizer(cols=1, hgap=0, 
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                                               rows=right_rows, vgap=0)
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        self.RightGridSizer.AddGrowableCol(0)
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        if right_growable_row is not None:
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            self.RightGridSizer.AddGrowableRow(right_growable_row)
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        column_sizer.AddSizer(self.RightGridSizer, 1, border=5, 
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              flag=wx.GROW|wx.LEFT)
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        self.SetSizer(self.MainSizer)
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    def SetMinElementSize(self, size):
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        """
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        Define minimal graphic element size
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        @param size: Tuple containing minimal size (width, height)
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        """
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        self.MinElementSize = size
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    def GetMinElementSize(self):
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        """
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        Get minimal graphic element size
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        @return: Tuple containing minimal size (width, height) or None if no
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        element defined
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        May be overridden by inherited classes
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        """
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        if self.Element is None:
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            return None
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        return self.Element.GetMinSize()
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    def SetPreviewFont(self, font):
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        """
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        Set font of Preview panel
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        @param font: wx.Font object containing font style
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        """
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        self.Preview.SetFont(font)
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    def RefreshVariableList(self):
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        """
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        Extract list of variables defined in POU
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        """
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        # Get list of variables defined in POU
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        self.VariableList = {
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            var.Name: (var.Class, var.Type)
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            for var in self.Controller.GetEditedElementInterfaceVars(
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                                                        self.TagName)
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            if var.Edit}
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        # Add POU name to variable list if POU is a function 
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        returntype = self.Controller.GetEditedElementInterfaceReturnType(
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                                                            self.TagName)
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        if returntype is not None:
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            self.VariableList[
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                self.Controller.GetEditedElementName(self.TagName)] = \
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                 ("Output", returntype)
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        # Add POU name if POU is a transition
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        words = self.TagName.split("::")
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        if words[0] == "T":
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            self.VariableList[words[2]] = ("Output", "BOOL")
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    def TestElementName(self, element_name):
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        """
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        Test displayed graphic element name
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        @param element_name: Graphic element name
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        """
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        # Variable containing error message format
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        message_format = None
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        # Get graphic element name in upper case
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        uppercase_element_name = element_name.upper()
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        # Test if graphic element name is a valid identifier
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        if not TestIdentifier(element_name):
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            message_format = _("\"%s\" is not a valid identifier!")
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        # Test that graphic element name isn't a keyword
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        elif uppercase_element_name in IEC_KEYWORDS:
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            message_format = _("\"%s\" is a keyword. It can't be used!")
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        # Test that graphic element name isn't a POU name
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        elif uppercase_element_name in self.Controller.GetProjectPouNames():
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            message_format = _("\"%s\" pou already exists!")
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        # Test that graphic element name isn't already used in POU by a variable
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        # or another graphic element
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        elif ((self.DefaultElementName is None or 
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               self.DefaultElementName.upper() != uppercase_element_name) and 
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              uppercase_element_name in self.Controller.\
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                    GetEditedElementVariables(self.TagName)):
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            message_format = _("\"%s\" element for this pou already exists!")
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        # If an error have been identify, show error message dialog
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        if message_format is not None:
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            self.ShowErrorMessage(message_format % element_name)
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            # Test failed
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            return False
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        # Test succeed
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        return True
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    def ShowErrorMessage(self, message):
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        """
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        Show an error message dialog over this dialog
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        @param message: Error message to display
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        """
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        dialog = wx.MessageDialog(self, message, 
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                                  _("Error"), 
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                                  wx.OK|wx.ICON_ERROR)
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        dialog.ShowModal()
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        dialog.Destroy()
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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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        Need to be overridden by inherited classes to check that dialog values
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        are valid
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        @param event: wx.Event from OK button
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        """
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        # Close dialog
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        self.EndModal(wx.ID_OK)
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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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        May be overridden by inherited classes
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        """
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        # Init preview panel paint device context
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        dc = wx.ClientDC(self.Preview)
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        dc.SetFont(self.Preview.GetFont())
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        dc.Clear()
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        # Return immediately if no graphic element defined
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        if self.Element is None:
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            return
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        # Calculate block size according to graphic element min size due to its
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        # parameters and graphic element min size defined
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        min_width, min_height = self.GetMinElementSize()
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        width = max(self.MinElementSize[0], min_width)
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        height = max(self.MinElementSize[1], min_height)
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        self.Element.SetSize(width, height)
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        # Get element position and bounding box to center in preview
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        posx, posy = self.Element.GetPosition()
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        bbox = self.Element.GetBoundingBox()
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        # Get Preview panel size
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        client_size = self.Preview.GetClientSize()
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        # If graphic element is too big to be displayed in preview panel,
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        # calculate preview panel scale so that graphic element fit inside
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        scale = (max(float(bbox.width) / client_size.width, 
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                     float(bbox.height) / client_size.height) * 1.1
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                 if bbox.width * 1.1 > client_size.width or 
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                    bbox.height * 1.1 > client_size.height
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                 else 1.0)
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        dc.SetUserScale(1.0 / scale, 1.0 / scale)
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        # Center graphic element in preview panel
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        x = int(client_size.width * scale - bbox.width) / 2 + posx - bbox.x
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        y = int(client_size.height * scale - bbox.height) / 2 + posy - bbox.y
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        self.Element.SetPosition(x, y)
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        # Draw graphic element
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        self.Element.Draw(dc)
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    def OnPaint(self, event):
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        """
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        Called when Preview panel need to be redraw
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        @param event: wx.PaintEvent
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        """
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        self.RefreshPreview()
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        event.Skip()
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