dialogs/SFCStepDialog.py
author Laurent Bessard
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# -*- coding: utf-8 -*-
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#This file is part of PLCOpenEditor, a library implementing an IEC 61131-3 editor
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#based on the plcopen standard. 
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#
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#Copyright (C) 2007: 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 library is free software; you can redistribute it and/or
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#modify it under the terms of the GNU General Public
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#License as published by the Free Software Foundation; either
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#version 2.1 of the License, or (at your option) any later version.
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#
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#This library 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 GNU
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#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
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#License along with this library; if not, write to the Free Software
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#Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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import wx
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from graphics.SFC_Objects import SFC_Step
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from BlockPreviewDialog import BlockPreviewDialog
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#-------------------------------------------------------------------------------
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#                         Set SFC Step Parameters Dialog
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#-------------------------------------------------------------------------------
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"""
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Class that implements a dialog for defining parameters of a SFC step graphic
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element
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"""
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class SFCStepDialog(BlockPreviewDialog):
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    def __init__(self, parent, controller, tagname, initial=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 initial: True if step is initial (default: False)
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        """
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        BlockPreviewDialog.__init__(self,parent, controller, tagname,  
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              size=wx.Size(400, 250), title=_('Edit Step'))
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        # Init common sizers
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        self._init_sizers(2, 0, 6, None, 2, 1)
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        # Create label for SFC step name
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        name_label = wx.StaticText(self, label=_('Name:'))
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        self.LeftGridSizer.AddWindow(name_label, flag=wx.GROW)
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        # Create text control for defining SFC step name
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        self.StepName = wx.TextCtrl(self)
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        self.Bind(wx.EVT_TEXT, self.OnNameChanged, self.StepName)
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        self.LeftGridSizer.AddWindow(self.StepName, flag=wx.GROW)
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        # Create label for SFC step connectors
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        connectors_label = wx.StaticText(self, label=_('Connectors:'))
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        self.LeftGridSizer.AddWindow(connectors_label, flag=wx.GROW)
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        # Create check boxes for defining connectors available on SFC step
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        self.ConnectorsCheckBox = {}
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        for name, label in [("input", _("Input")),
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                            ("output", _("Output")),
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                            ("action", _("Action"))]:
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            check_box = wx.CheckBox(self, label=label)
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            self.Bind(wx.EVT_CHECKBOX, self.OnConnectorsChanged, check_box)
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            self.LeftGridSizer.AddWindow(check_box, flag=wx.GROW)
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            self.ConnectorsCheckBox[name] = check_box
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        # Add preview panel and associated label to sizers
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        self.RightGridSizer.AddWindow(self.PreviewLabel, flag=wx.GROW)
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        self.RightGridSizer.AddWindow(self.Preview, flag=wx.GROW)
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        # Add buttons sizer to sizers
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        self.MainSizer.AddSizer(self.ButtonSizer, border=20, 
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              flag=wx.ALIGN_RIGHT|wx.BOTTOM|wx.LEFT|wx.RIGHT)
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        # Save flag that indicates that step is initial
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        self.Initial = initial
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        # Set default name for step
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        self.StepName.ChangeValue(controller.GenerateNewName(
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               tagname, None, "Step%d", 0))
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        # Step name text control is default control having keyboard focus
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        self.StepName.SetFocus()
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    def SetValues(self, values):
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        """
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        Set default block parameters
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        @param values: Block parameters values
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        """
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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 step name
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            if name == "name":
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                self.StepName.ChangeValue(value)
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            # Set value of other controls
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            else:
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                control = self.ConnectorsCheckBox.get(name, None)
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                if control is not None:
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                    control.SetValue(value)
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        # Refresh preview panel
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        self.RefreshPreview()
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    def GetValues(self):
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        """
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        Return step parameters defined in dialog
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        @return: {parameter_name: parameter_value,...}
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        """
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        values = {"name": self.StepName.GetValue()}
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        values.update({
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            name: control.IsChecked()
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            for name, control in self.ConnectorsCheckBox.iteritems()})
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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 step name defined is 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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        # Get step name typed by user
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        step_name = self.StepName.GetValue()
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        # Test that a name have been defined
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        if step_name == "":
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            message = _("Form isn't complete. Name must be filled!")
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        # If an error have been identify, show error message dialog
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        if message is not None:
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            self.ShowErrorMessage(message)
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        # Test step name validity
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        elif self.TestElementName(step_name):
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            # Call BlockPreviewDialog function
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            BlockPreviewDialog.OnOK(self, event)
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    def OnConnectorsChanged(self, event):
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        """
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        Called when a step connector value changed
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        @param event: wx.CheckBoxEvent
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        """
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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 step name value changed
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        @param event: wx.TextEvent
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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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        # Set graphic element displayed, creating a SFC step element
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        self.Element = SFC_Step(self.Preview, 
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                                self.StepName.GetValue(), 
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                                self.Initial)
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        # Update connectors of SFC step element according to check boxes value
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        for name, control in self.ConnectorsCheckBox.iteritems():
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            if control.IsChecked():
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                getattr(self.Element, "Add" + name.capitalize())()
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            else:
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                getattr(self.Element, "Remove" + name.capitalize())()
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        # Call BlockPreviewDialog function
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        BlockPreviewDialog.RefreshPreview(self)