dialogs/BlockPreviewDialog.py
author Andrey Skvortsov <andrej.skvortzov@gmail.com>
Thu, 28 Sep 2017 12:20:40 +0300
changeset 1831 56b48961cc68
parent 1782 5b6ad7a7fd9d
child 1878 fb73a6b6622d
permissions -rwxr-xr-x
fix (old-style-class) Old-style class defined error for most parts of
the code

only PyJS code is left, because it does some fancy tricks and can't be
easily fixed. So far PyJS doesn't support Python3 anyway.
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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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# 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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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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class BlockPreviewDialog(wx.Dialog):
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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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    def __init__(self, parent, controller, tagname, 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 title: Title of dialog frame
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        """
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        wx.Dialog.__init__(self, parent, 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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        self.Fit()
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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,
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                     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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        self.ColumnSizer = wx.BoxSizer(wx.HORIZONTAL)
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        self.MainSizer.AddSizer(self.ColumnSizer, 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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        self.ColumnSizer.AddSizer(self.LeftGridSizer, 1, border=5,
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                                  flag=wx.GROW | wx.RIGHT | wx.EXPAND)
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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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        self.ColumnSizer.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.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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        k = 1.1 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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        scale = (max(float(bbox.width) / client_size.width,
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                     float(bbox.height) / client_size.height) * k)
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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()