FBDViewer.py
changeset 27 dae55dd9ee14
parent 26 36d378bd852e
child 28 fc23e1f415d8
equal deleted inserted replaced
26:36d378bd852e 27:dae55dd9ee14
     1 #!/usr/bin/env python
       
     2 # -*- coding: utf-8 -*-
       
     3 
       
     4 #This file is part of PLCOpenEditor, a library implementing an IEC 61131-3 editor
       
     5 #based on the plcopen standard. 
       
     6 #
       
     7 #Copyright (C): Edouard TISSERANT and Laurent BESSARD
       
     8 #
       
     9 #See COPYING file for copyrights details.
       
    10 #
       
    11 #This library is free software; you can redistribute it and/or
       
    12 #modify it under the terms of the GNU General Public
       
    13 #License as published by the Free Software Foundation; either
       
    14 #version 2.1 of the License, or (at your option) any later version.
       
    15 #
       
    16 #This library is distributed in the hope that it will be useful,
       
    17 #but WITHOUT ANY WARRANTY; without even the implied warranty of
       
    18 #MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
       
    19 #Lesser General Public License for more details.
       
    20 #
       
    21 #You should have received a copy of the GNU General Public
       
    22 #License along with this library; if not, write to the Free Software
       
    23 #Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
       
    24 
       
    25 from wxPython.wx import *
       
    26 import wx
       
    27 
       
    28 from plcopen.structures import *
       
    29 from graphics.GraphicCommons import *
       
    30 from graphics.FBD_Objects import *
       
    31 from Viewer import *
       
    32 
       
    33 class FBD_Viewer(Viewer):
       
    34     
       
    35     def __init__(self, parent, window, controler):
       
    36         Viewer.__init__(self, parent, window, controler)
       
    37 
       
    38 #-------------------------------------------------------------------------------
       
    39 #                          Mouse event functions
       
    40 #-------------------------------------------------------------------------------
       
    41 
       
    42     def OnViewerLeftDown(self, event):
       
    43         if self.Mode == MODE_SELECTION:
       
    44             pos = event.GetPosition()
       
    45             if event.ControlDown() and self.SelectedElement:
       
    46                 element = self.FindElement(pos, True)
       
    47                 if element:
       
    48                     if isinstance(self.SelectedElement, Graphic_Group):
       
    49                         self.SelectedElement.SetSelected(False)
       
    50                         self.SelectedElement.SelectElement(element)
       
    51                     elif self.SelectedElement:
       
    52                         group = Graphic_Group(self)
       
    53                         group.SelectElement(self.SelectedElement)
       
    54                         group.SelectElement(element)
       
    55                         self.SelectedElement = group
       
    56                     elements = self.SelectedElement.GetElements()
       
    57                     if len(elements) == 0:
       
    58                         self.SelectedElement = element
       
    59                     elif len(elements) == 1:
       
    60                         self.SelectedElement = elements[0]
       
    61                     self.SelectedElement.SetSelected(True)
       
    62             else:
       
    63                 element = self.FindElement(pos)
       
    64                 if self.SelectedElement and self.SelectedElement != element:
       
    65                     self.SelectedElement.SetSelected(False)
       
    66                     self.SelectedElement = None
       
    67                     self.Refresh()
       
    68                 if element:
       
    69                     self.SelectedElement = element
       
    70                     self.SelectedElement.OnLeftDown(event, self.Scaling)
       
    71                     self.Refresh()
       
    72                 else:
       
    73                     self.rubberBand.Reset()
       
    74                     self.rubberBand.OnLeftDown(event, self.Scaling)
       
    75         elif self.Mode in [MODE_BLOCK,MODE_VARIABLE,MODE_CONNECTION,MODE_COMMENT]:
       
    76             self.rubberBand.Reset()
       
    77             self.rubberBand.OnLeftDown(event, self.Scaling)
       
    78         elif self.Mode == MODE_WIRE:
       
    79             pos = GetScaledEventPosition(event, self.Scaling)
       
    80             connector = self.FindBlockConnector(pos)
       
    81             if connector:
       
    82                 if (connector.GetDirection() == EAST):
       
    83                     wire = Wire(self, [wxPoint(pos.x, pos.y), EAST], [wxPoint(pos.x, pos.y), WEST])
       
    84                 else:
       
    85                     wire = Wire(self, [wxPoint(pos.x, pos.y), WEST], [wxPoint(pos.x, pos.y), EAST])
       
    86                 wire.oldPos = pos
       
    87                 wire.Handle = (HANDLE_POINT, 0)
       
    88                 wire.ProcessDragging(0, 0)
       
    89                 wire.Handle = (HANDLE_POINT, 1)
       
    90                 self.Wires.append(wire)
       
    91                 self.Elements.append(wire)
       
    92                 if self.SelectedElement:
       
    93                     self.SelectedElement.SetSelected(False)
       
    94                 self.SelectedElement = wire
       
    95             elif self.SelectedElement:
       
    96                 self.SelectedElement.SetSelected(False)
       
    97                 self.SelectedElement = None
       
    98             self.Refresh()
       
    99         event.Skip()
       
   100 
       
   101     def OnViewerLeftUp(self, event):
       
   102         if self.rubberBand.IsShown():
       
   103             if self.Mode == MODE_SELECTION:
       
   104                 elements = self.SearchElements(self.rubberBand.GetCurrentExtent())
       
   105                 self.rubberBand.OnLeftUp(event, self.Scaling)
       
   106                 if len(elements) > 0:
       
   107                     self.SelectedElement = Graphic_Group(self)
       
   108                     self.SelectedElement.SetElements(elements)
       
   109                     self.SelectedElement.SetSelected(True)
       
   110                     self.Refresh()
       
   111             elif self.Mode == MODE_BLOCK:
       
   112                 bbox = self.rubberBand.GetCurrentExtent()
       
   113                 self.rubberBand.OnLeftUp(event, self.Scaling)
       
   114                 wxCallAfter(self.AddNewBlock, bbox)
       
   115             elif self.Mode == MODE_VARIABLE:
       
   116                 bbox = self.rubberBand.GetCurrentExtent()
       
   117                 self.rubberBand.OnLeftUp(event, self.Scaling)
       
   118                 wxCallAfter(self.AddNewVariable, bbox)
       
   119             elif self.Mode == MODE_CONNECTION:
       
   120                 bbox = self.rubberBand.GetCurrentExtent()
       
   121                 self.rubberBand.OnLeftUp(event, self.Scaling)
       
   122                 wxCallAfter(self.AddNewConnection, bbox)
       
   123             elif self.Mode == MODE_COMMENT:
       
   124                 bbox = self.rubberBand.GetCurrentExtent()
       
   125                 self.rubberBand.OnLeftUp(event, self.Scaling)
       
   126                 wxCallAfter(self.AddNewComment, bbox)
       
   127         elif self.Mode == MODE_SELECTION and self.SelectedElement:
       
   128             self.SelectedElement.OnLeftUp(event, self.Scaling)
       
   129             wxCallAfter(self.SetCursor, wxNullCursor)
       
   130             self.ReleaseMouse()
       
   131             self.Refresh()
       
   132         elif self.Mode == MODE_WIRE and self.SelectedElement:
       
   133             pos = GetScaledEventPosition(event, self.Scaling)
       
   134             connector = self.FindBlockConnector(pos, False)
       
   135             if connector and connector != self.SelectedElement.StartConnected:
       
   136                 self.SelectedElement.ResetPoints()
       
   137                 self.SelectedElement.OnMotion(event, self.Scaling)
       
   138                 self.SelectedElement.GeneratePoints()
       
   139                 self.SelectedElement.RefreshModel()
       
   140                 self.SelectedElement.SetSelected(True)
       
   141             else:
       
   142                 self.SelectedElement.Delete()
       
   143                 self.SelectedElement = None
       
   144             self.Refresh()
       
   145         if not self.SavedMode:
       
   146             wxCallAfter(self.Parent.ResetCurrentMode)
       
   147         event.Skip()
       
   148     
       
   149     def OnViewerRightUp(self, event):
       
   150         pos = event.GetPosition()
       
   151         element = self.FindElement(pos)
       
   152         if element:
       
   153             if self.SelectedElement and self.SelectedElement != element:
       
   154                 self.SelectedElement.SetSelected(False)
       
   155             self.SelectedElement = element
       
   156             self.SelectedElement.SetSelected(True)
       
   157             self.SelectedElement.OnRightUp(event, self.Scaling)
       
   158             wxCallAfter(self.SetCursor, wxNullCursor)
       
   159             self.ReleaseMouse()
       
   160             self.Refresh()
       
   161         event.Skip()
       
   162     
       
   163     def OnViewerLeftDClick(self, event):
       
   164         if self.Mode == MODE_SELECTION and self.SelectedElement:
       
   165             self.SelectedElement.OnLeftDClick(event, self.Scaling)
       
   166             self.Refresh()
       
   167         event.Skip()
       
   168     
       
   169     def OnViewerMotion(self, event):
       
   170         if self.rubberBand.IsShown():
       
   171             self.rubberBand.OnMotion(event, self.Scaling)
       
   172         elif self.Mode == MODE_SELECTION and self.SelectedElement:
       
   173             self.SelectedElement.OnMotion(event, self.Scaling)
       
   174             self.Refresh()
       
   175         elif self.Mode == MODE_WIRE and self.SelectedElement:
       
   176             pos = GetScaledEventPosition(event, self.Scaling)
       
   177             connector = self.FindBlockConnector(pos, False)
       
   178             if not connector or self.SelectedElement.EndConnected == None:
       
   179                 self.SelectedElement.ResetPoints()
       
   180                 self.SelectedElement.OnMotion(event, self.Scaling)
       
   181                 self.SelectedElement.GeneratePoints()
       
   182                 self.Refresh()
       
   183         event.Skip()
       
   184 
       
   185 #-------------------------------------------------------------------------------
       
   186 #                          Keyboard event functions
       
   187 #-------------------------------------------------------------------------------
       
   188 
       
   189     def OnChar(self, event):
       
   190         keycode = event.GetKeyCode()
       
   191         if self.Scaling:
       
   192             scaling = self.Scaling
       
   193         else:
       
   194             scaling = (8, 8)
       
   195         if keycode == WXK_DELETE and self.SelectedElement:
       
   196             self.SelectedElement.Clean()
       
   197             self.SelectedElement.Delete()
       
   198             self.SelectedElement = None
       
   199         elif keycode == WXK_LEFT and self.SelectedElement:
       
   200             self.SelectedElement.Move(-scaling[0], 0)
       
   201         elif keycode == WXK_RIGHT and self.SelectedElement:
       
   202             self.SelectedElement.Move(scaling[0], 0)
       
   203         elif keycode == WXK_UP and self.SelectedElement:
       
   204             self.SelectedElement.Move(0, -scaling[1])
       
   205         elif keycode == WXK_DOWN and self.SelectedElement:
       
   206             self.SelectedElement.Move(0, scaling[1])
       
   207         self.Refresh()
       
   208         event.Skip()
       
   209 
       
   210 #-------------------------------------------------------------------------------
       
   211 #                          Adding element functions
       
   212 #-------------------------------------------------------------------------------
       
   213 
       
   214     def AddNewBlock(self, bbox):
       
   215         dialog = BlockPropertiesDialog(self.Parent)
       
   216         dialog.SetBlockList(self.Controler.GetBlockTypes())
       
   217         dialog.SetMinBlockSize((bbox.width, bbox.height))
       
   218         if dialog.ShowModal() == wxID_OK:
       
   219             id = self.GetNewId()
       
   220             values = dialog.GetValues()
       
   221             if "name" in values:
       
   222                 block = FBD_Block(self, values["type"], values["name"], id, values["extension"])
       
   223             else:
       
   224                 block = FBD_Block(self, values["type"], "", id, values["extension"])
       
   225             block.SetPosition(bbox.x, bbox.y)
       
   226             block.SetSize(values["width"], values["height"])
       
   227             self.Blocks.append(block)
       
   228             self.Elements.append(block)
       
   229             self.Controler.AddCurrentElementEditingBlock(id)
       
   230             self.RefreshBlockModel(block)
       
   231             self.Refresh()
       
   232         dialog.Destroy()
       
   233     
       
   234     def AddNewVariable(self, bbox):
       
   235         dialog = VariablePropertiesDialog(self.Parent)
       
   236         dialog.SetMinVariableSize((bbox.width, bbox.height))
       
   237         varlist = []
       
   238         vars = self.Controler.GetCurrentElementEditingInterfaceVars()
       
   239         if vars:
       
   240             for var in vars:
       
   241                 varlist.append((var["Name"], var["Class"], var["Type"]))
       
   242         returntype = self.Controler.GetCurrentElementEditingInterfaceReturnType()
       
   243         if returntype:
       
   244             varlist.append((self.Controler.GetCurrentElementEditingName(), "Output", returntype))
       
   245         dialog.SetVariables(varlist)
       
   246         if dialog.ShowModal() == wxID_OK:
       
   247             id = self.GetNewId()
       
   248             values = dialog.GetValues()
       
   249             variable = FBD_Variable(self, values["type"], values["name"], values["value_type"], id)
       
   250             variable.SetPosition(bbox.x, bbox.y)
       
   251             variable.SetSize(values["width"], values["height"])
       
   252             self.Blocks.append(variable)
       
   253             self.Elements.append(variable)
       
   254             self.Controler.AddCurrentElementEditingVariable(id, values["type"])
       
   255             self.RefreshVariableModel(variable)
       
   256             self.Refresh()
       
   257         dialog.Destroy()
       
   258 
       
   259     def AddNewConnection(self, bbox):
       
   260         dialog = ConnectionPropertiesDialog(self.Parent)
       
   261         dialog.SetMinConnectionSize((bbox.width, bbox.height))
       
   262         if dialog.ShowModal() == wxID_OK:
       
   263             id = self.GetNewId()
       
   264             values = dialog.GetValues()
       
   265             connection = FBD_Connection(self, values["type"], values["name"], id)
       
   266             connection.SetPosition(bbox.x, bbox.y)
       
   267             connection.SetSize(values["width"], values["height"])
       
   268             self.Blocks.append(connection)
       
   269             self.Elements.append(connection)
       
   270             self.Controler.AddCurrentElementEditingConnection(id, values["type"])
       
   271             self.RefreshConnectionModel(connection)
       
   272             self.Refresh()
       
   273         dialog.Destroy()
       
   274 
       
   275     def AddNewComment(self, bbox):
       
   276         dialog = wxTextEntryDialog(self.Parent, "Add a new comment", "Please enter comment text", "", wxOK|wxCANCEL|wxTE_MULTILINE)
       
   277         if dialog.ShowModal() == wxID_OK:
       
   278             value = dialog.GetValue()
       
   279             id = self.GetNewId()
       
   280             comment = Comment(self, value, id)
       
   281             comment.SetPosition(bbox.x, bbox.y)
       
   282             min_width, min_height = comment.GetMinSize()
       
   283             comment.SetSize(max(min_width,bbox.width),max(min_height,bbox.height))
       
   284             self.Elements.append(comment)
       
   285             self.Controler.AddCurrentElementEditingComment(id)
       
   286             self.RefreshCommentModel(comment)
       
   287             self.Refresh()
       
   288         dialog.Destroy()
       
   289             
       
   290 #-------------------------------------------------------------------------------
       
   291 #                          Delete element functions
       
   292 #-------------------------------------------------------------------------------
       
   293 
       
   294     def DeleteBlock(self, block):
       
   295         wires = []
       
   296         for output in block.GetConnectors()["outputs"]:
       
   297             wires.extend([wire[0] for wire in output.GetWires()])
       
   298         block.Clean()
       
   299         self.Blocks.remove(block)
       
   300         self.Elements.remove(block)
       
   301         self.Controler.RemoveCurrentElementEditingInstance(block.GetId())
       
   302         for wire in wires:
       
   303             wire.RefreshModel()
       
   304 
       
   305     def DeleteVariable(self, variable):
       
   306         wires = []
       
   307         if variable.GetType() == INPUT:
       
   308             connector = variable.GetConnector()
       
   309             wires.extend([wire[0] for wire in connector.GetWires()])
       
   310         variable.Clean()
       
   311         self.Blocks.remove(variable)
       
   312         self.Elements.remove(variable)
       
   313         self.Controler.RemoveCurrentElementEditingInstance(variable.GetId())
       
   314         for wire in wires:
       
   315             wire.RefreshModel()
       
   316 
       
   317     def DeleteConnection(self, connection):
       
   318         wires = []
       
   319         if connection.GetType() == CONTINUATION:
       
   320             connector = connection.GetConnector()
       
   321             wires.extend([wire[0] for wire in connector.GetWires()])
       
   322         connection.Clean()
       
   323         self.Blocks.remove(connection)
       
   324         self.Elements.remove(connection)
       
   325         self.Controler.RemoveCurrentElementEditingInstance(connection.GetId())
       
   326         for wire in wires:
       
   327             wire.RefreshModel()
       
   328 
       
   329     def DeleteComment(self, comment):
       
   330         self.Elements.remove(comment)
       
   331         self.Controler.RemoveCurrentElementEditingInstance(comment.GetId())
       
   332 
       
   333     def DeleteWire(self, wire):
       
   334         connected = wire.GetConnected()
       
   335         wire.Clean()
       
   336         self.Wires.remove(wire)
       
   337         self.Elements.remove(wire)
       
   338         for connector in connected:
       
   339             connector.RefreshParentBlock()
       
   340 
       
   341 #-------------------------------------------------------------------------------
       
   342 #                          Edit element content functions
       
   343 #-------------------------------------------------------------------------------
       
   344 
       
   345     def EditBlockContent(self, block):
       
   346         dialog = BlockPropertiesDialog(self.Parent)
       
   347         dialog.SetBlockList(self.Controler.GetBlockTypes())
       
   348         dialog.SetMinBlockSize(block.GetSize())
       
   349         values = {"name" : block.GetName(), "type" : block.GetType()}
       
   350         values["extension"] = block.GetExtension()
       
   351         dialog.SetValues(values)
       
   352         if dialog.ShowModal() == wxID_OK:
       
   353             values = dialog.GetValues()
       
   354             if "name" in values:
       
   355                 block.SetName(values["name"])
       
   356             block.SetExtension(values["extension"])
       
   357             block.SetSize(values["width"], values["height"])
       
   358             block.SetType(values["type"])
       
   359             self.RefreshBlockModel(block)
       
   360             self.Refresh()
       
   361         dialog.Destroy()
       
   362 
       
   363     def EditVariableContent(self, variable):
       
   364         dialog = VariablePropertiesDialog(self.Parent)
       
   365         dialog.SetMinVariableSize(variable.GetSize())
       
   366         varlist = []
       
   367         vars = self.Controler.GetCurrentElementEditingInterfaceVars()
       
   368         if vars:
       
   369             for var in vars:
       
   370                 varlist.append((var["Name"], var["Class"], var["Type"]))
       
   371         returntype = self.Controler.GetCurrentElementEditingInterfaceReturnType()
       
   372         if returntype:
       
   373             varlist.append((self.Controler.GetCurrentElementEditingName(), "Output", returntype))
       
   374         dialog.SetVariables(varlist)
       
   375         values = {"name" : variable.GetName(), "type" : variable.GetType()}
       
   376         dialog.SetValues(values)
       
   377         if dialog.ShowModal() == wxID_OK:
       
   378             old_type = variable.GetType()
       
   379             values = dialog.GetValues()
       
   380             variable.SetName(values["name"])
       
   381             variable.SetType(values["type"], values["value_type"])
       
   382             variable.SetSize(values["width"], values["height"])
       
   383             if old_type != values["type"]:
       
   384                 id = variable.GetId()
       
   385                 self.Controler.RemoveCurrentElementEditingInstance(id)
       
   386                 self.Controler.AddCurrentElementEditingVariable(id, values["type"])
       
   387             self.RefreshVariableModel(variable)
       
   388             self.Refresh()
       
   389         dialog.Destroy()
       
   390 
       
   391 #-------------------------------------------------------------------------------
       
   392 #                          Create New Block Dialog
       
   393 #-------------------------------------------------------------------------------
       
   394 
       
   395 [wxID_BLOCKPROPERTIESDIALOG, wxID_BLOCKPROPERTIESDIALOGMAINPANEL, 
       
   396  wxID_BLOCKPROPERTIESDIALOGNAME, wxID_BLOCKPROPERTIESDIALOGTYPETREE, 
       
   397  wxID_BLOCKPROPERTIESDIALOGTYPEDESC, wxID_BLOCKPROPERTIESDIALOGINPUTS, 
       
   398  wxID_BLOCKPROPERTIESDIALOGPREVIEW, wxID_BLOCKPROPERTIESDIALOGSTATICTEXT1, 
       
   399  wxID_BLOCKPROPERTIESDIALOGSTATICTEXT2, wxID_BLOCKPROPERTIESDIALOGSTATICTEXT3, 
       
   400  wxID_BLOCKPROPERTIESDIALOGSTATICTEXT4, 
       
   401 ] = [wx.NewId() for _init_ctrls in range(11)]
       
   402 
       
   403 [CATEGORY, BLOCK] = range(2)
       
   404 
       
   405 class BlockPropertiesDialog(wx.Dialog):
       
   406     def _init_coll_flexGridSizer1_Items(self, parent):
       
   407         # generated method, don't edit
       
   408 
       
   409         parent.AddWindow(self.MainPanel, 0, border=0, flag=0)
       
   410 
       
   411     def _init_sizers(self):
       
   412         # generated method, don't edit
       
   413         self.flexGridSizer1 = wx.FlexGridSizer(cols=1, hgap=0, rows=2, vgap=0)
       
   414 
       
   415         self._init_coll_flexGridSizer1_Items(self.flexGridSizer1)
       
   416 
       
   417         self.SetSizer(self.flexGridSizer1)
       
   418 
       
   419     def _init_ctrls(self, prnt):
       
   420         # generated method, don't edit
       
   421         wx.Dialog.__init__(self, id=wxID_BLOCKPROPERTIESDIALOG,
       
   422               name='BlockPropertiesDialog', parent=prnt, pos=wx.Point(376, 223),
       
   423               size=wx.Size(600, 360), style=wx.DEFAULT_DIALOG_STYLE,
       
   424               title='Block Properties')
       
   425         self.SetClientSize(wx.Size(600, 360))
       
   426 
       
   427         self.MainPanel = wx.Panel(id=wxID_BLOCKPROPERTIESDIALOGMAINPANEL,
       
   428               name='MainPanel', parent=self, pos=wx.Point(0, 0),
       
   429               size=wx.Size(600, 320), style=wx.TAB_TRAVERSAL)
       
   430         self.MainPanel.SetAutoLayout(True)
       
   431 
       
   432         self.staticbox1 = wx.StaticBox(id=wxID_BLOCKPROPERTIESDIALOGSTATICTEXT1,
       
   433               label='Type:', name='staticBox1', parent=self.MainPanel,
       
   434               pos=wx.Point(24, 24), size=wx.Size(245, 280), style=0)
       
   435 
       
   436         self.staticText2 = wx.StaticText(id=wxID_BLOCKPROPERTIESDIALOGSTATICTEXT2,
       
   437               label='Name:', name='staticText2', parent=self.MainPanel,
       
   438               pos=wx.Point(274, 24), size=wx.Size(70, 17), style=0)
       
   439 
       
   440         self.staticText3 = wx.StaticText(id=wxID_BLOCKPROPERTIESDIALOGSTATICTEXT2,
       
   441               label='Inputs:', name='staticText4', parent=self.MainPanel,
       
   442               pos=wx.Point(424, 24), size=wx.Size(70, 17), style=0)
       
   443 
       
   444         self.staticText4 = wx.StaticText(id=wxID_BLOCKPROPERTIESDIALOGSTATICTEXT4,
       
   445               label='Preview:', name='staticText4', parent=self.MainPanel,
       
   446               pos=wx.Point(274, 80), size=wx.Size(100, 17), style=0)
       
   447 
       
   448         self.TypeTree = wx.TreeCtrl(id=wxID_BLOCKPROPERTIESDIALOGTYPETREE,
       
   449               name='TypeTree', parent=self.MainPanel, pos=wx.Point(34, 44),
       
   450               size=wx.Size(225, 180), style=wx.TR_HAS_BUTTONS|wx.TR_HIDE_ROOT|wx.TR_SINGLE|wx.SUNKEN_BORDER)
       
   451         EVT_TREE_SEL_CHANGED(self, wxID_BLOCKPROPERTIESDIALOGTYPETREE, self.OnTypeTreeItemSelected)
       
   452 
       
   453         self.TypeDesc = wx.TextCtrl(id=wxID_BLOCKPROPERTIESDIALOGTYPEDESC,
       
   454               name='TypeDesc', parent=self.MainPanel, pos=wx.Point(34, 230),
       
   455               size=wx.Size(225, 65), style=wx.TE_READONLY|wx.TE_MULTILINE)
       
   456 
       
   457         self.Name = wx.TextCtrl(id=wxID_BLOCKPROPERTIESDIALOGNAME, value='',
       
   458               name='Name', parent=self.MainPanel, pos=wx.Point(274, 48),
       
   459               size=wx.Size(145, 24), style=0)
       
   460         EVT_TEXT(self, wxID_BLOCKPROPERTIESDIALOGNAME, self.OnNameChanged)
       
   461 
       
   462         self.Inputs = wx.SpinCtrl(id=wxID_BLOCKPROPERTIESDIALOGINPUTS,
       
   463               name='Inputs', parent=self.MainPanel, pos=wx.Point(424, 48),
       
   464               size=wx.Size(145, 24), style=0, min=2, max=20)
       
   465         EVT_SPINCTRL(self, wxID_BLOCKPROPERTIESDIALOGINPUTS, self.OnInputsChanged)
       
   466 
       
   467         self.Preview = wx.Panel(id=wxID_BLOCKPROPERTIESDIALOGPREVIEW,
       
   468               name='Preview', parent=self.MainPanel, pos=wx.Point(274, 104),
       
   469               size=wx.Size(300, 200), style=wx.TAB_TRAVERSAL|wx.SIMPLE_BORDER)
       
   470         self.Preview.SetBackgroundColour(wxColour(255,255,255))
       
   471 
       
   472         self._init_sizers()
       
   473 
       
   474     def __init__(self, parent):
       
   475         self._init_ctrls(parent)
       
   476         self.ButtonSizer = self.CreateButtonSizer(wxOK|wxCANCEL|wxCENTRE)
       
   477         self.flexGridSizer1.Add(self.ButtonSizer, 1, wxALIGN_RIGHT)
       
   478         self.Name.SetValue("")
       
   479         self.Name.Enable(False)
       
   480         self.Inputs.Enable(False)
       
   481         self.Block = None
       
   482         self.MinBlockSize = None
       
   483         
       
   484         EVT_PAINT(self, self.OnPaint)
       
   485         EVT_BUTTON(self, self.ButtonSizer.GetAffirmativeButton().GetId(), self.OnOK)
       
   486     
       
   487     def FindTreeItem(self, root, name):
       
   488         if root.IsOk():
       
   489             if self.TypeTree.GetItemText(root) == name:
       
   490                 return root
       
   491             else:
       
   492                 item, root_cookie = self.TypeTree.GetFirstChild(root)
       
   493                 while item.IsOk():
       
   494                     result = self.FindTreeItem(item, name)
       
   495                     if result:
       
   496                         return result
       
   497                     item, root_cookie = self.TypeTree.GetNextChild(root, root_cookie)
       
   498         return None
       
   499     
       
   500     def OnOK(self, event):
       
   501         error = []
       
   502         selected = self.TypeTree.GetSelection()
       
   503         if not selected.IsOk() or self.TypeTree.GetItemParent(selected) == self.TypeTree.GetRootItem() or selected == self.TypeTree.GetRootItem():
       
   504             message = wxMessageDialog(self, "Form isn't complete. Valid block type must be selected!", "Error", wxOK|wxICON_ERROR)
       
   505             message.ShowModal()
       
   506             message.Destroy()
       
   507         elif self.Name.IsEnabled() and self.Name.GetValue() == "":
       
   508             message = wxMessageDialog(self, "Form isn't complete. Name must be filled!", "Error", wxOK|wxICON_ERROR)
       
   509             message.ShowModal()
       
   510             message.Destroy()
       
   511         else:
       
   512             self.EndModal(wxID_OK)
       
   513 
       
   514     def SetBlockList(self, blocktypes):
       
   515         root = self.TypeTree.AddRoot("")
       
   516         self.TypeTree.SetPyData(root, CATEGORY)
       
   517         for category in blocktypes:
       
   518             category_item = self.TypeTree.AppendItem(root, category["name"])
       
   519             self.TypeTree.SetPyData(category_item, CATEGORY)
       
   520             for blocktype in category["list"]:
       
   521                 blocktype_item = self.TypeTree.AppendItem(category_item, blocktype["name"])
       
   522                 self.TypeTree.SetPyData(blocktype_item, BLOCK)
       
   523 
       
   524     def SetMinBlockSize(self, size):
       
   525         self.MinBlockSize = size
       
   526 
       
   527     def SetValues(self, values):
       
   528         for name, value in values.items():
       
   529             if name == "type":
       
   530                 item = self.FindTreeItem(self.TypeTree.GetRootItem(), value)
       
   531                 if item:
       
   532                     self.TypeTree.SelectItem(item)
       
   533             elif name == "name":
       
   534                 self.Name.SetValue(value)
       
   535             elif name == "extension":
       
   536                 self.Inputs.SetValue(value)
       
   537         self.RefreshPreview()
       
   538 
       
   539     def GetValues(self):
       
   540         values = {}
       
   541         values["type"] = self.TypeTree.GetItemText(self.TypeTree.GetSelection())
       
   542         if self.Name.GetValue() != "":
       
   543             values["name"] = self.Name.GetValue()
       
   544         values["width"], values["height"] = self.Block.GetSize()
       
   545         values["extension"] = self.Inputs.GetValue()
       
   546         return values
       
   547 
       
   548     def OnTypeTreeItemSelected(self, event):
       
   549         self.Name.SetValue("")
       
   550         selected = event.GetItem()
       
   551         if self.TypeTree.GetPyData(selected) != CATEGORY:
       
   552             blocktype = GetBlockType(self.TypeTree.GetItemText(selected))
       
   553             if blocktype:
       
   554                 self.Inputs.SetValue(len(blocktype["inputs"]))
       
   555                 self.Inputs.Enable(blocktype["extensible"])
       
   556                 self.Name.Enable(blocktype["type"] != "function")
       
   557                 self.TypeDesc.SetValue(blocktype["comment"])
       
   558                 wxCallAfter(self.RefreshPreview)
       
   559             else:
       
   560                 self.Name.Enable(False)
       
   561                 self.Inputs.Enable(False)
       
   562                 self.Inputs.SetValue(2)
       
   563                 self.TypeDesc.SetValue("")
       
   564                 wxCallAfter(self.ErasePreview)
       
   565         else:
       
   566             self.Name.Enable(False)
       
   567             self.Inputs.Enable(False)
       
   568             self.Inputs.SetValue(2)
       
   569             self.TypeDesc.SetValue("")
       
   570             wxCallAfter(self.ErasePreview)
       
   571         event.Skip()
       
   572 
       
   573     def OnNameChanged(self, event):
       
   574         if self.Name.IsEnabled():
       
   575             self.RefreshPreview()
       
   576         event.Skip()
       
   577     
       
   578     def OnInputsChanged(self, event):
       
   579         if self.Inputs.IsEnabled():
       
   580             self.RefreshPreview()
       
   581         event.Skip()
       
   582     
       
   583     def ErasePreview(self):
       
   584         dc = wxClientDC(self.Preview)
       
   585         dc.Clear()
       
   586         self.Block = None
       
   587         
       
   588     def RefreshPreview(self):
       
   589         dc = wxClientDC(self.Preview)
       
   590         dc.Clear()
       
   591         item = self.TypeTree.GetSelection()
       
   592         if self.TypeTree.GetPyData(item) == CATEGORY:
       
   593             self.Block = None
       
   594         else:
       
   595             blocktype = self.TypeTree.GetItemText(item)
       
   596             if blocktype:
       
   597                 self.Block = FBD_Block(self.Preview, blocktype, self.Name.GetValue(), extension = self.Inputs.GetValue())
       
   598                 width, height = self.MinBlockSize
       
   599                 min_width, min_height = self.Block.GetMinSize()
       
   600                 width, height = max(min_width, width), max(min_height, height)
       
   601                 self.Block.SetSize(width, height)
       
   602                 clientsize = self.Preview.GetClientSize()
       
   603                 x = (clientsize.width - width) / 2
       
   604                 y = (clientsize.height - height) / 2
       
   605                 self.Block.SetPosition(x, y)
       
   606                 self.Block.Draw(dc)
       
   607             else:
       
   608                 self.Block = None
       
   609 
       
   610     def OnPaint(self, event):
       
   611         if self.Block:
       
   612             self.RefreshPreview()
       
   613 
       
   614 
       
   615 #-------------------------------------------------------------------------------
       
   616 #                          Create New Variable Dialog
       
   617 #-------------------------------------------------------------------------------
       
   618 
       
   619 [wxID_VARIABLEPROPERTIESDIALOG, wxID_VARIABLEPROPERTIESDIALOGMAINPANEL, 
       
   620  wxID_VARIABLEPROPERTIESDIALOGNAME, wxID_VARIABLEPROPERTIESDIALOGCLASS, 
       
   621  wxID_VARIABLEPROPERTIESDIALOGPREVIEW, wxID_VARIABLEPROPERTIESDIALOGSTATICTEXT1,
       
   622  wxID_VARIABLEPROPERTIESDIALOGSTATICTEXT2, wxID_VARIABLEPROPERTIESDIALOGSTATICTEXT3, 
       
   623 ] = [wx.NewId() for _init_ctrls in range(8)]
       
   624 
       
   625 class VariablePropertiesDialog(wx.Dialog):
       
   626     def _init_coll_flexGridSizer1_Items(self, parent):
       
   627         # generated method, don't edit
       
   628 
       
   629         parent.AddWindow(self.MainPanel, 0, border=0, flag=0)
       
   630 
       
   631     def _init_sizers(self):
       
   632         # generated method, don't edit
       
   633         self.flexGridSizer1 = wx.FlexGridSizer(cols=1, hgap=0, rows=2, vgap=0)
       
   634 
       
   635         self._init_coll_flexGridSizer1_Items(self.flexGridSizer1)
       
   636 
       
   637         self.SetSizer(self.flexGridSizer1)
       
   638 
       
   639     def _init_ctrls(self, prnt):
       
   640         # generated method, don't edit
       
   641         wx.Dialog.__init__(self, id=wxID_VARIABLEPROPERTIESDIALOG,
       
   642               name='VariablePropertiesDialog', parent=prnt, pos=wx.Point(376, 223),
       
   643               size=wx.Size(400, 320), style=wx.DEFAULT_DIALOG_STYLE,
       
   644               title='Variable Properties')
       
   645         self.SetClientSize(wx.Size(400, 320))
       
   646 
       
   647         self.MainPanel = wx.Panel(id=wxID_VARIABLEPROPERTIESDIALOGMAINPANEL,
       
   648               name='MainPanel', parent=self, pos=wx.Point(0, 0),
       
   649               size=wx.Size(400, 280), style=wx.TAB_TRAVERSAL)
       
   650         self.MainPanel.SetAutoLayout(True)
       
   651 
       
   652         self.staticText1 = wx.StaticText(id=wxID_VARIABLEPROPERTIESDIALOGSTATICTEXT1,
       
   653               label='Class:', name='staticText1', parent=self.MainPanel,
       
   654               pos=wx.Point(24, 24), size=wx.Size(70, 17), style=0)
       
   655 
       
   656         self.staticText2 = wx.StaticText(id=wxID_VARIABLEPROPERTIESDIALOGSTATICTEXT2,
       
   657               label='Name:', name='staticText2', parent=self.MainPanel,
       
   658               pos=wx.Point(204, 24), size=wx.Size(70, 17), style=0)
       
   659 
       
   660         self.staticText3 = wx.StaticText(id=wxID_VARIABLEPROPERTIESDIALOGSTATICTEXT3,
       
   661               label='Preview:', name='staticText3', parent=self.MainPanel,
       
   662               pos=wx.Point(24, 78), size=wx.Size(100, 17), style=0)
       
   663 
       
   664         self.Class = wx.Choice(id=wxID_VARIABLEPROPERTIESDIALOGCLASS,
       
   665               name='Class', parent=self.MainPanel, pos=wx.Point(24, 48),
       
   666               size=wx.Size(145, 24), style=0)
       
   667         EVT_CHOICE(self, wxID_VARIABLEPROPERTIESDIALOGCLASS, self.OnClassChanged)
       
   668         
       
   669         self.Name = wx.Choice(id=wxID_VARIABLEPROPERTIESDIALOGNAME,
       
   670               name='Name', parent=self.MainPanel, pos=wx.Point(204, 48),
       
   671               size=wx.Size(145, 24), style=0)
       
   672         EVT_CHOICE(self, wxID_VARIABLEPROPERTIESDIALOGNAME, self.OnNameChanged)
       
   673 
       
   674         self.Preview = wx.Panel(id=wxID_VARIABLEPROPERTIESDIALOGPREVIEW,
       
   675               name='Preview', parent=self.MainPanel, pos=wx.Point(24, 104),
       
   676               size=wx.Size(350, 150), style=wx.TAB_TRAVERSAL|wx.SIMPLE_BORDER)
       
   677         self.Preview.SetBackgroundColour(wxColour(255,255,255))
       
   678 
       
   679         self._init_sizers()
       
   680 
       
   681     def __init__(self, parent):
       
   682         self._init_ctrls(parent)
       
   683         self.ButtonSizer = self.CreateButtonSizer(wxOK|wxCANCEL|wxCENTRE)
       
   684         self.flexGridSizer1.Add(self.ButtonSizer, 1, wxALIGN_RIGHT)
       
   685         self.Variable = None
       
   686         self.VarList = []
       
   687         self.MinVariableSize = None
       
   688         self.RefreshNameList()
       
   689         
       
   690         for choice in ["Input", "Output", "InOut"]:
       
   691             self.Class.Append(choice)
       
   692         self.Class.SetStringSelection("Input")
       
   693         
       
   694         EVT_PAINT(self, self.OnPaint)
       
   695 
       
   696     def RefreshNameList(self):
       
   697         selected = self.Name.GetStringSelection()
       
   698         self.Name.Clear()
       
   699         for name, var_type, value_type in self.VarList:
       
   700             if var_type in ["Local","Temp","Output","InOut"]:
       
   701                 self.Name.Append(name)
       
   702             elif var_type == "Input" and self.Class.GetStringSelection() == "Input":
       
   703                 self.Name.Append(name)
       
   704         if self.Name.FindString(selected) != wxNOT_FOUND:
       
   705             self.Name.SetStringSelection(selected)
       
   706         self.Name.Enable(self.Name.GetCount() > 0)
       
   707             
       
   708     def SetMinVariableSize(self, size):
       
   709         self.MinVariableSize = size
       
   710 
       
   711     def SetVariables(self, vars):
       
   712         self.VarList = vars
       
   713         self.RefreshNameList()
       
   714 
       
   715     def SetValues(self, values):
       
   716         for name, value in values.items():
       
   717             if name == "type":
       
   718                 if value == INPUT:
       
   719                     self.Class.SetStringSelection("Input")
       
   720                 if value == OUTPUT:
       
   721                     self.Class.SetStringSelection("Output")
       
   722                 if value == INOUT:
       
   723                     self.Class.SetStringSelection("InOut")
       
   724             elif name == "name":
       
   725                 self.Name.SetStringSelection(value)
       
   726         self.RefreshPreview()
       
   727         
       
   728     def GetValues(self):
       
   729         values = {}
       
   730         classtype = self.Class.GetStringSelection()
       
   731         if classtype == "Input":
       
   732             values["type"] = INPUT
       
   733         elif classtype == "Output":
       
   734             values["type"] = OUTPUT
       
   735         elif classtype == "InOut":
       
   736             values["type"] = INOUT
       
   737         values["name"] = self.Name.GetStringSelection()
       
   738         values["value_type"] = ""
       
   739         for var_name, var_type, value_type in self.VarList:
       
   740             if var_name == values["name"]:
       
   741                 values["value_type"] = value_type
       
   742         values["width"], values["height"] = self.Variable.GetSize()
       
   743         return values
       
   744 
       
   745     def OnClassChanged(self, event):
       
   746         self.RefreshNameList()
       
   747         self.RefreshPreview()
       
   748         event.Skip()
       
   749 
       
   750     def OnNameChanged(self, event):
       
   751         self.RefreshPreview()
       
   752         event.Skip()
       
   753         
       
   754     def RefreshPreview(self):
       
   755         dc = wxClientDC(self.Preview)
       
   756         dc.Clear()
       
   757         name = self.Name.GetStringSelection()
       
   758         type = ""
       
   759         for var_name, var_type, value_type in self.VarList:
       
   760             if var_name == name:
       
   761                 type = value_type
       
   762         classtype = self.Class.GetStringSelection()
       
   763         if classtype == "Input":
       
   764             self.Variable = FBD_Variable(self.Preview, INPUT, name, type)
       
   765         elif classtype == "Output":
       
   766             self.Variable = FBD_Variable(self.Preview, OUTPUT, name, type)
       
   767         elif classtype == "InOut":
       
   768             self.Variable = FBD_Variable(self.Preview, INOUT, name, type)
       
   769         width, height = self.MinVariableSize
       
   770         min_width, min_height = self.Variable.GetMinSize()
       
   771         width, height = max(min_width, width), max(min_height, height)
       
   772         self.Variable.SetSize(width, height)
       
   773         clientsize = self.Preview.GetClientSize()
       
   774         x = (clientsize.width - width) / 2
       
   775         y = (clientsize.height - height) / 2
       
   776         self.Variable.SetPosition(x, y)
       
   777         self.Variable.Draw(dc)
       
   778 
       
   779     def OnPaint(self, event):
       
   780         self.RefreshPreview()
       
   781 
       
   782 #-------------------------------------------------------------------------------
       
   783 #                          Create New Connection Dialog
       
   784 #-------------------------------------------------------------------------------
       
   785 
       
   786 [wxID_CONNECTIONPROPERTIESDIALOG, wxID_CONNECTIONPROPERTIESDIALOGMAINPANEL, 
       
   787  wxID_CONNECTIONPROPERTIESDIALOGNAME, wxID_CONNECTIONPROPERTIESDIALOGRADIOBUTTON1, 
       
   788  wxID_CONNECTIONPROPERTIESDIALOGRADIOBUTTON2, wxID_CONNECTIONPROPERTIESDIALOGPREVIEW,
       
   789  wxID_CONNECTIONPROPERTIESDIALOGSTATICTEXT1, wxID_CONNECTIONPROPERTIESDIALOGSTATICTEXT2, 
       
   790  wxID_CONNECTIONPROPERTIESDIALOGSTATICTEXT3, 
       
   791 ] = [wx.NewId() for _init_ctrls in range(9)]
       
   792 
       
   793 class ConnectionPropertiesDialog(wx.Dialog):
       
   794     def _init_coll_flexGridSizer1_Items(self, parent):
       
   795         # generated method, don't edit
       
   796 
       
   797         parent.AddWindow(self.MainPanel, 0, border=0, flag=0)
       
   798 
       
   799     def _init_sizers(self):
       
   800         # generated method, don't edit
       
   801         self.flexGridSizer1 = wx.FlexGridSizer(cols=1, hgap=0, rows=2, vgap=0)
       
   802 
       
   803         self._init_coll_flexGridSizer1_Items(self.flexGridSizer1)
       
   804 
       
   805         self.SetSizer(self.flexGridSizer1)
       
   806 
       
   807     def _init_ctrls(self, prnt):
       
   808         # generated method, don't edit
       
   809         wx.Dialog.__init__(self, id=wxID_CONNECTIONPROPERTIESDIALOG,
       
   810               name='ConnectionPropertiesDialog', parent=prnt, pos=wx.Point(376, 223),
       
   811               size=wx.Size(350, 220), style=wx.DEFAULT_DIALOG_STYLE,
       
   812               title='Connection Properties')
       
   813         self.SetClientSize(wx.Size(350, 220))
       
   814 
       
   815         self.MainPanel = wx.Panel(id=wxID_CONNECTIONPROPERTIESDIALOGMAINPANEL,
       
   816               name='MainPanel', parent=self, pos=wx.Point(0, 0),
       
   817               size=wx.Size(340, 360), style=wx.TAB_TRAVERSAL)
       
   818         self.MainPanel.SetAutoLayout(True)
       
   819 
       
   820         self.staticText1 = wx.StaticText(id=wxID_CONNECTIONPROPERTIESDIALOGSTATICTEXT1,
       
   821               label='Type:', name='staticText1', parent=self.MainPanel,
       
   822               pos=wx.Point(24, 24), size=wx.Size(70, 17), style=0)
       
   823 
       
   824         self.staticText2 = wx.StaticText(id=wxID_CONNECTIONPROPERTIESDIALOGSTATICTEXT2,
       
   825               label='Name:', name='staticText2', parent=self.MainPanel,
       
   826               pos=wx.Point(24, 104), size=wx.Size(70, 17), style=0)
       
   827 
       
   828         self.staticText3 = wx.StaticText(id=wxID_CONNECTIONPROPERTIESDIALOGSTATICTEXT3,
       
   829               label='Preview:', name='staticText3', parent=self.MainPanel,
       
   830               pos=wx.Point(174, 24), size=wx.Size(100, 17), style=0)
       
   831 
       
   832         self.radioButton1 = wx.RadioButton(id=wxID_CONNECTIONPROPERTIESDIALOGRADIOBUTTON1,
       
   833               label='Connector', name='radioButton1', parent=self.MainPanel,
       
   834               pos=wx.Point(24, 48), size=wx.Size(114, 24), style=0)
       
   835         EVT_RADIOBUTTON(self, wxID_CONNECTIONPROPERTIESDIALOGRADIOBUTTON1, self.OnTypeChanged)
       
   836         self.radioButton1.SetValue(True)
       
   837 
       
   838         self.radioButton2 = wx.RadioButton(id=wxID_CONNECTIONPROPERTIESDIALOGRADIOBUTTON2,
       
   839               label='Continuation', name='radioButton2', parent=self.MainPanel, 
       
   840               pos=wx.Point(24, 72), size=wx.Size(128, 24), style=0)
       
   841         EVT_RADIOBUTTON(self, wxID_CONNECTIONPROPERTIESDIALOGRADIOBUTTON2, self.OnTypeChanged)
       
   842         self.radioButton2.SetValue(False)
       
   843         
       
   844         self.Name = wx.TextCtrl(id=wxID_CONNECTIONPROPERTIESDIALOGNAME,
       
   845               name='Name', parent=self.MainPanel, pos=wx.Point(24, 130),
       
   846               size=wx.Size(145, 24), style=0)
       
   847         EVT_TEXT(self, wxID_CONNECTIONPROPERTIESDIALOGNAME, self.OnNameChanged)
       
   848 
       
   849         self.Preview = wx.Panel(id=wxID_CONNECTIONPROPERTIESDIALOGPREVIEW,
       
   850               name='Preview', parent=self.MainPanel, pos=wx.Point(174, 48),
       
   851               size=wx.Size(150, 100), style=wx.TAB_TRAVERSAL|wx.SIMPLE_BORDER)
       
   852         self.Preview.SetBackgroundColour(wxColour(255,255,255))
       
   853 
       
   854         self._init_sizers()
       
   855 
       
   856     def __init__(self, parent):
       
   857         self._init_ctrls(parent)
       
   858         self.ButtonSizer = self.CreateButtonSizer(wxOK|wxCANCEL|wxCENTRE)
       
   859         self.flexGridSizer1.Add(self.ButtonSizer, 1, wxALIGN_RIGHT)
       
   860         self.Connection = None
       
   861         self.MinConnectionSize = None
       
   862         
       
   863         EVT_PAINT(self, self.OnPaint)
       
   864             
       
   865     def SetMinConnectionSize(self, size):
       
   866         self.MinConnectionSize = size
       
   867         
       
   868     def GetValues(self):
       
   869         values = {}
       
   870         if self.radioButton1.GetValue():
       
   871             values["type"] = CONNECTOR
       
   872         else:
       
   873             values["type"] = CONTINUATION
       
   874         values["name"] = self.Name.GetValue()
       
   875         values["width"], values["height"] = self.Connection.GetSize()
       
   876         return values
       
   877 
       
   878     def OnTypeChanged(self, event):
       
   879         self.RefreshPreview()
       
   880         event.Skip()
       
   881 
       
   882     def OnNameChanged(self, event):
       
   883         self.RefreshPreview()
       
   884         event.Skip()
       
   885         
       
   886     def RefreshPreview(self):
       
   887         dc = wxClientDC(self.Preview)
       
   888         dc.Clear()
       
   889         if self.radioButton1.GetValue():
       
   890             self.Connection = FBD_Connector(self.Preview, CONNECTOR, self.Name.GetValue())
       
   891         else:
       
   892             self.Connection = FBD_Connector(self.Preview, CONTINUATION, self.Name.GetValue())
       
   893         width, height = self.MinConnectionSize
       
   894         min_width, min_height = self.Connection.GetMinSize()
       
   895         width, height = max(min_width, width), max(min_height, height)
       
   896         self.Connection.SetSize(width, height)
       
   897         clientsize = self.Preview.GetClientSize()
       
   898         x = (clientsize.width - width) / 2
       
   899         y = (clientsize.height - height) / 2
       
   900         self.Connection.SetPosition(x, y)
       
   901         self.Connection.Draw(dc)
       
   902 
       
   903     def OnPaint(self, event):
       
   904         self.RefreshPreview()
       
   905