editors/LDViewer.py
changeset 814 5743cbdff669
child 890 b3cafb73c5e9
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/editors/LDViewer.py	Fri Sep 07 16:45:55 2012 +0200
@@ -0,0 +1,1192 @@
+#!/usr/bin/env python
+# -*- coding: utf-8 -*-
+
+#This file is part of PLCOpenEditor, a library implementing an IEC 61131-3 editor
+#based on the plcopen standard. 
+#
+#Copyright (C) 2007: Edouard TISSERANT and Laurent BESSARD
+#
+#See COPYING file for copyrights details.
+#
+#This library is free software; you can redistribute it and/or
+#modify it under the terms of the GNU General Public
+#License as published by the Free Software Foundation; either
+#version 2.1 of the License, or (at your option) any later version.
+#
+#This library is distributed in the hope that it will be useful,
+#but WITHOUT ANY WARRANTY; without even the implied warranty of
+#MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+#General Public License for more details.
+#
+#You should have received a copy of the GNU General Public
+#License along with this library; if not, write to the Free Software
+#Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+import wx
+import time
+from types import *
+
+from Viewer import *
+
+def ExtractNextBlocks(block, block_list):
+    current_list = [block]
+    while len(current_list) > 0:
+        next_list = []
+        for current in current_list:
+            connectors = current.GetConnectors()
+            input_connectors = []
+            if isinstance(current, LD_PowerRail) and current.GetType() == RIGHTRAIL:
+                input_connectors = connectors
+            else:
+                if "inputs" in connectors:
+                    input_connectors = connectors["inputs"]
+                if "input" in connectors:
+                    input_connectors = [connectors["input"]]
+            for connector in input_connectors:
+                for wire, handle in connector.GetWires():
+                    next = wire.EndConnected.GetParentBlock()
+                    if not isinstance(next, LD_PowerRail) and next not in block_list:
+                        block_list.append(next)
+                        next_list.append(next)
+        current_list = next_list
+    
+def CalcBranchSize(elements, stops):
+    branch_size = 0
+    stop_list = stops
+    for stop in stops:
+        ExtractNextBlocks(stop, stop_list)
+    element_tree = {}
+    for element in elements:
+        if element not in element_tree:
+            element_tree[element] = {"parents":["start"], "children":[], "weight":None}
+            GenerateTree(element, element_tree, stop_list)
+        elif element_tree[element]:
+            element_tree[element]["parents"].append("start")
+    remove_stops = {"start":[], "stop":[]}
+    for element, values in element_tree.items():
+        if "stop" in values["children"]:
+            removed = []
+            for child in values["children"]:
+                if child != "stop":
+##                    if child in elements:
+##                        RemoveElement(child, element_tree)
+##                        removed.append(child)
+                    if "start" in element_tree[child]["parents"]:
+                        if element not in remove_stops["stop"]:
+                            remove_stops["stop"].append(element)
+                        if child not in remove_stops["start"]:
+                            remove_stops["start"].append(child)
+            for child in removed:
+                values["children"].remove(child)
+    for element in remove_stops["start"]:
+        element_tree[element]["parents"].remove("start")
+    for element in remove_stops["stop"]:
+        element_tree[element]["children"].remove("stop")
+    for element, values in element_tree.items():
+        if values and "stop" in values["children"]:
+            CalcWeight(element, element_tree)
+            if values["weight"]:
+                branch_size += values["weight"]
+            else:
+                return 1
+    #print branch_size
+    return branch_size
+
+def RemoveElement(remove, element_tree):
+    if remove in element_tree and element_tree[remove]:
+        for child in element_tree[remove]["children"]:
+            if child != "stop":
+                RemoveElement(child, element_tree)
+        element_tree.pop(remove)
+##        element_tree[remove] = None
+
+def GenerateTree(element, element_tree, stop_list):
+    if element in element_tree:
+        connectors = element.GetConnectors()
+        input_connectors = []
+        if isinstance(element, LD_PowerRail) and element.GetType() == RIGHTRAIL:
+            input_connectors = connectors
+        else:
+            if "inputs" in connectors:
+                input_connectors = connectors["inputs"]
+            if "input" in connectors:
+                input_connectors = [connectors["input"]]
+        for connector in input_connectors:
+            for wire, handle in connector.GetWires():
+                next = wire.EndConnected.GetParentBlock()
+                if isinstance(next, LD_PowerRail) and next.GetType() == LEFTRAIL or next in stop_list:
+##                    for remove in element_tree[element]["children"]:
+##                        RemoveElement(remove, element_tree)
+##                    element_tree[element]["children"] = ["stop"]
+                    element_tree[element]["children"].append("stop")
+##                elif element_tree[element]["children"] == ["stop"]:
+##                    element_tree[next] = None
+                elif next not in element_tree or element_tree[next]:
+                    element_tree[element]["children"].append(next)
+                    if next in element_tree:
+                        element_tree[next]["parents"].append(element)
+                    else:
+                        element_tree[next] = {"parents":[element], "children":[], "weight":None}
+                        GenerateTree(next, element_tree, stop_list)
+
+def CalcWeight(element, element_tree):
+    weight = 0
+    parts = None
+    if element in element_tree:
+        for parent in element_tree[element]["parents"]:
+            if parent == "start":
+                weight += 1
+            elif parent in element_tree:
+                if not parts:
+                    parts = len(element_tree[parent]["children"])
+                else:
+                    parts = min(parts, len(element_tree[parent]["children"]))
+                if not element_tree[parent]["weight"]:
+                    CalcWeight(parent, element_tree)
+                if element_tree[parent]["weight"]:
+                    weight += element_tree[parent]["weight"]
+                else:
+                    element_tree[element]["weight"] = None
+                    return
+            else:
+                element_tree[element]["weight"] = None
+                return
+        if not parts:
+            parts = 1
+        element_tree[element]["weight"] = max(1, weight / parts)
+
+
+#-------------------------------------------------------------------------------
+#                     Ladder Diagram Graphic elements Viewer class
+#-------------------------------------------------------------------------------
+
+
+"""
+Class derived from Viewer class that implements a Viewer of Ladder Diagram
+"""
+
+class LD_Viewer(Viewer):
+
+    def __init__(self, parent, tagname, window, controler, debug = False, instancepath = ""):
+        Viewer.__init__(self, parent, tagname, window, controler, debug, instancepath)
+        self.Rungs = []
+        self.RungComments = []
+        self.CurrentLanguage = "LD"
+
+#-------------------------------------------------------------------------------
+#                          Refresh functions
+#-------------------------------------------------------------------------------
+
+    def ResetView(self):
+        self.Rungs = []
+        self.RungComments = []
+        Viewer.ResetView(self)
+
+    def RefreshView(self, variablepanel=True, selection=None):
+        Viewer.RefreshView(self, variablepanel, selection)
+        wx.CallAfter(self.Refresh)
+        for i, rung in enumerate(self.Rungs):
+            bbox = rung.GetBoundingBox()
+            if i < len(self.RungComments):
+                if self.RungComments[i]:
+                    pos = self.RungComments[i].GetPosition()
+                    if pos[1] > bbox.y:
+                        self.RungComments.insert(i, None)
+            else:
+                self.RungComments.insert(i, None)
+    
+    def loadInstance(self, instance, ids, selection):
+        Viewer.loadInstance(self, instance, ids, selection)
+        if self.GetDrawingMode() != FREEDRAWING_MODE:
+            if instance["type"] == "leftPowerRail":
+                element = self.FindElementById(instance["id"])
+                rung = Graphic_Group(self)
+                rung.SelectElement(element)
+                self.Rungs.append(rung)
+            elif instance["type"] == "rightPowerRail":
+                rungs = []
+                for connector in instance["inputs"]:
+                    for link in connector["links"]:
+                        connected = self.FindElementById(link["refLocalId"])
+                        rung = self.FindRung(connected)
+                        if rung not in rungs:
+                            rungs.append(rung)
+                if len(rungs) > 1:
+                    raise ValueError, _("Ladder element with id %d is on more than one rung.")%instance["id"]
+                element = self.FindElementById(instance["id"])
+                element_connectors = element.GetConnectors()
+                self.Rungs[rungs[0]].SelectElement(element)
+                for connector in element_connectors["inputs"]:
+                    for wire, num in connector.GetWires():
+                        self.Rungs[rungs[0]].SelectElement(wire)
+                wx.CallAfter(self.RefreshPosition, element)
+            elif instance["type"] in ["contact", "coil"]:
+                rungs = []
+                for link in instance["inputs"][0]["links"]:
+                    connected = self.FindElementById(link["refLocalId"])
+                    rung = self.FindRung(connected)
+                    if rung not in rungs:
+                        rungs.append(rung)
+                if len(rungs) > 1:
+                    raise ValueError, _("Ladder element with id %d is on more than one rung.")%instance["id"]
+                element = self.FindElementById(instance["id"])
+                element_connectors = element.GetConnectors() 
+                self.Rungs[rungs[0]].SelectElement(element)
+                for wire, num in element_connectors["inputs"][0].GetWires():
+                    self.Rungs[rungs[0]].SelectElement(wire)
+                wx.CallAfter(self.RefreshPosition, element)
+            elif instance["type"] == "comment":
+                element = self.FindElementById(instance["id"])
+                pos = element.GetPosition()
+                i = 0
+                inserted = False
+                while i < len(self.RungComments) and not inserted: 
+                    ipos = self.RungComments[i].GetPosition()
+                    if pos[1] < ipos[1]:
+                        self.RungComments.insert(i, element)
+                        inserted = True
+                    i += 1
+                if not inserted:
+                    self.RungComments.append(element)
+            
+#-------------------------------------------------------------------------------
+#                          Search Element functions
+#-------------------------------------------------------------------------------
+
+    def FindRung(self, element):
+        for i, rung in enumerate(self.Rungs):
+            if rung.IsElementIn(element):
+                return i
+        return None
+
+    def FindElement(self, event, exclude_group = False, connectors = True):
+        if self.GetDrawingMode() == FREEDRAWING_MODE:
+            return Viewer.FindElement(self, event, exclude_group, connectors)
+        
+        dc = self.GetLogicalDC()
+        pos = event.GetLogicalPosition(dc)
+        if self.SelectedElement and not isinstance(self.SelectedElement, (Graphic_Group, Wire)):
+            if self.SelectedElement.HitTest(pos, connectors) or self.SelectedElement.TestHandle(pos) != (0, 0):
+                return self.SelectedElement
+        elements = []
+        for element in self.GetElements(sort_wires=True):
+            if element.HitTest(pos, connectors) or element.TestHandle(event) != (0, 0):
+                elements.append(element)
+        if len(elements) == 1:
+            return elements[0]
+        elif len(elements) > 1:
+            group = Graphic_Group(self)
+            for element in elements:
+                if self.IsBlock(element):
+                    return element
+                group.SelectElement(element)
+            return group
+        return None
+
+    def SearchElements(self, bbox):
+        elements = []
+        for element in self.Blocks.values() + self.Comments.values():
+            if element.IsInSelection(bbox):
+                elements.append(element)
+        return elements
+
+#-------------------------------------------------------------------------------
+#                          Mouse event functions
+#-------------------------------------------------------------------------------
+
+    def OnViewerLeftDown(self, event):
+        if self.GetDrawingMode() == FREEDRAWING_MODE:
+            Viewer.OnViewerLeftDown(self, event)
+        elif self.Mode == MODE_SELECTION:
+            element = self.FindElement(event)
+            if self.SelectedElement:
+                if not isinstance(self.SelectedElement, Graphic_Group):
+                    if self.SelectedElement != element:
+                        if self.IsWire(self.SelectedElement):
+                            self.SelectedElement.SetSelectedSegment(None)
+                        else:
+                            self.SelectedElement.SetSelected(False)
+                    else:
+                        self.SelectedElement = None
+                elif element and isinstance(element, Graphic_Group):
+                    if self.SelectedElement.GetElements() != element.GetElements():
+                        for elt in self.SelectedElement.GetElements():
+                            if self.IsWire(elt):
+                                elt.SetSelectedSegment(None)
+                        self.SelectedElement.SetSelected(False)
+                        self.SelectedElement = None
+                else:
+                    for elt in self.SelectedElement.GetElements():
+                        if self.IsWire(elt):
+                            elt.SetSelectedSegment(None)
+                    self.SelectedElement.SetSelected(False)
+                    self.SelectedElement = None
+            if element:
+                self.SelectedElement = element
+                self.SelectedElement.OnLeftDown(event, self.GetLogicalDC(), self.Scaling)
+                self.SelectedElement.Refresh()
+            else:
+                self.rubberBand.Reset()
+                self.rubberBand.OnLeftDown(event, self.GetLogicalDC(), self.Scaling)
+        event.Skip()
+
+    def OnViewerLeftUp(self, event):
+        if self.GetDrawingMode() == FREEDRAWING_MODE:
+            Viewer.OnViewerLeftUp(self, event)
+        elif self.rubberBand.IsShown():
+            if self.Mode == MODE_SELECTION:
+                elements = self.SearchElements(self.rubberBand.GetCurrentExtent())
+                self.rubberBand.OnLeftUp(event, self.GetLogicalDC(), self.Scaling)
+                if len(elements) > 0:
+                    self.SelectedElement = Graphic_Group(self)
+                    self.SelectedElement.SetElements(elements)
+                    self.SelectedElement.SetSelected(True)
+        elif self.Mode == MODE_SELECTION and self.SelectedElement:
+            dc = self.GetLogicalDC() 
+            if not isinstance(self.SelectedElement, Graphic_Group):
+                if self.IsWire(self.SelectedElement):
+                    result = self.SelectedElement.TestSegment(event.GetLogicalPosition(dc), True)
+                    if result and result[1] in [EAST, WEST]:
+                        self.SelectedElement.SetSelectedSegment(result[0])
+                else:
+                    self.SelectedElement.OnLeftUp(event, dc, self.Scaling)
+            else:
+                for element in self.SelectedElement.GetElements():
+                    if self.IsWire(element):
+                        result = element.TestSegment(event.GetLogicalPosition(dc), True)
+                        if result and result[1] in [EAST, WEST]:
+                            element.SetSelectedSegment(result[0])
+                    else:
+                        element.OnLeftUp(event, dc, self.Scaling)
+            self.SelectedElement.Refresh()
+            wx.CallAfter(self.SetCurrentCursor, 0)
+        event.Skip()
+
+    def OnViewerRightUp(self, event):
+        if self.GetDrawingMode() == FREEDRAWING_MODE:
+            Viewer.OnViewerRightUp(self, event)
+        else:
+            element = self.FindElement(event)
+            if element:
+                if self.SelectedElement and self.SelectedElement != element:
+                    self.SelectedElement.SetSelected(False)
+                self.SelectedElement = element
+                if self.IsWire(self.SelectedElement):
+                    self.SelectedElement.SetSelectedSegment(0)
+                else:
+                    self.SelectedElement.SetSelected(True)
+                    self.SelectedElement.OnRightUp(event, self.GetLogicalDC(), self.Scaling)
+                    self.SelectedElement.Refresh()
+                wx.CallAfter(self.SetCurrentCursor, 0)
+        event.Skip()
+
+#-------------------------------------------------------------------------------
+#                          Keyboard event functions
+#-------------------------------------------------------------------------------
+
+    def OnChar(self, event):
+        if self.GetDrawingMode() == FREEDRAWING_MODE:
+            Viewer.OnChar(self, event)
+        else:
+            xpos, ypos = self.GetScrollPos(wx.HORIZONTAL), self.GetScrollPos(wx.VERTICAL)
+            xmax = self.GetScrollRange(wx.HORIZONTAL) - self.GetScrollThumb(wx.HORIZONTAL)
+            ymax = self.GetScrollRange(wx.VERTICAL) - self.GetScrollThumb(wx.VERTICAL)
+            keycode = event.GetKeyCode()
+            if keycode == wx.WXK_DELETE and self.SelectedElement:
+                if self.IsBlock(self.SelectedElement):
+                    self.SelectedElement.Delete()
+                elif self.IsWire(self.SelectedElement):
+                    self.DeleteWire(self.SelectedElement)
+                elif isinstance(self.SelectedElement, Graphic_Group):
+                    all_wires = True
+                    for element in self.SelectedElement.GetElements():
+                        all_wires &= self.IsWire(element)
+                    if all_wires:
+                        self.DeleteWire(self.SelectedElement)
+                    else:
+                        self.SelectedElement.Delete()
+                self.RefreshBuffer()
+                self.RefreshScrollBars()
+                self.Refresh(False)
+            elif keycode == wx.WXK_LEFT:
+                if event.ControlDown() and event.ShiftDown():
+                    self.Scroll(0, ypos)
+                elif event.ControlDown():
+                    self.Scroll(max(0, xpos - 1), ypos)
+            elif keycode == wx.WXK_RIGHT:
+                if event.ControlDown() and event.ShiftDown():
+                    self.Scroll(xmax, ypos)
+                elif event.ControlDown():
+                    self.Scroll(min(xpos + 1, xmax), ypos)
+            elif keycode == wx.WXK_UP:
+                if event.ControlDown() and event.ShiftDown():
+                    self.Scroll(xpos, 0)
+                elif event.ControlDown():
+                    self.Scroll(xpos, max(0, ypos - 1))
+            elif keycode == wx.WXK_DOWN:
+                if event.ControlDown() and event.ShiftDown():
+                    self.Scroll(xpos, ymax)
+                elif event.ControlDown():
+                    self.Scroll(xpos, min(ypos + 1, ymax))
+            else:
+                event.Skip()
+
+#-------------------------------------------------------------------------------
+#                  Model adding functions from Drop Target
+#-------------------------------------------------------------------------------
+
+    def AddVariableBlock(self, x, y, scaling, var_class, var_name, var_type):
+        if var_type == "BOOL":
+            id = self.GetNewId()
+            if var_class == INPUT:
+                contact = LD_Contact(self, CONTACT_NORMAL, var_name, id)
+                width, height = contact.GetMinSize()
+                if scaling is not None:
+                    x = round(float(x) / float(scaling[0])) * scaling[0]
+                    y = round(float(y) / float(scaling[1])) * scaling[1]
+                    width = round(float(width) / float(scaling[0]) + 0.5) * scaling[0]
+                    height = round(float(height) / float(scaling[1]) + 0.5) * scaling[1]
+                contact.SetPosition(x, y)
+                contact.SetSize(width, height)
+                self.AddBlock(contact)
+                self.Controler.AddEditedElementContact(self.GetTagName(), id)
+                self.RefreshContactModel(contact)
+            else:
+                coil = LD_Coil(self, COIL_NORMAL, var_name, id)
+                width, height = coil.GetMinSize()
+                if scaling is not None:
+                    x = round(float(x) / float(scaling[0])) * scaling[0]
+                    y = round(float(y) / float(scaling[1])) * scaling[1]
+                    width = round(float(width) / float(scaling[0]) + 0.5) * scaling[0]
+                    height = round(float(height) / float(scaling[1]) + 0.5) * scaling[1]
+                coil.SetPosition(x, y)
+                coil.SetSize(width, height)
+                self.AddBlock(coil)
+                self.Controler.AddEditedElementCoil(self.GetTagName(), id)
+                self.RefreshCoilModel(coil)
+            self.RefreshBuffer()
+            self.RefreshScrollBars()
+            self.RefreshVisibleElements()
+            self.Refresh(False)
+        else:
+            Viewer.AddVariableBlock(self, x, y, scaling, var_class, var_name, var_type)
+
+#-------------------------------------------------------------------------------
+#                          Adding element functions
+#-------------------------------------------------------------------------------
+
+    def AddLadderRung(self):
+        dialog = LDElementDialog(self.ParentWindow, self.Controler, "coil")
+        dialog.SetPreviewFont(self.GetFont())
+        varlist = []
+        vars = self.Controler.GetEditedElementInterfaceVars(self.TagName, self.Debug)
+        if vars:
+            for var in vars:
+                if var["Class"] != "Input" and var["Type"] == "BOOL":
+                    varlist.append(var["Name"])
+        returntype = self.Controler.GetEditedElementInterfaceReturnType(self.TagName, self.Debug)
+        if returntype == "BOOL":
+            varlist.append(self.Controler.GetEditedElementName(self.TagName))
+        dialog.SetVariables(varlist)
+        dialog.SetValues({"name":"","type":COIL_NORMAL})
+        if dialog.ShowModal() == wx.ID_OK:
+            values = dialog.GetValues()
+            startx, starty = LD_OFFSET[0], 0
+            if len(self.Rungs) > 0:
+                bbox = self.Rungs[-1].GetBoundingBox()
+                starty = bbox.y + bbox.height
+            starty += LD_OFFSET[1]
+            rung = Graphic_Group(self)
+            
+            # Create comment
+            id = self.GetNewId()
+            comment = Comment(self, _("Comment"), id)
+            comment.SetPosition(startx, starty)
+            comment.SetSize(LD_COMMENT_DEFAULTSIZE[0], LD_COMMENT_DEFAULTSIZE[1])
+            self.AddComment(comment)
+            self.RungComments.append(comment)
+            self.Controler.AddEditedElementComment(self.TagName, id)
+            self.RefreshCommentModel(comment)
+            starty += LD_COMMENT_DEFAULTSIZE[1] + LD_OFFSET[1]
+            
+            # Create LeftPowerRail
+            id = self.GetNewId()
+            leftpowerrail = LD_PowerRail(self, LEFTRAIL, id)
+            leftpowerrail.SetPosition(startx, starty)
+            leftpowerrail_connectors = leftpowerrail.GetConnectors()
+            self.AddBlock(leftpowerrail)
+            rung.SelectElement(leftpowerrail)
+            self.Controler.AddEditedElementPowerRail(self.TagName, id, LEFTRAIL)
+            self.RefreshPowerRailModel(leftpowerrail)
+            
+            # Create Coil
+            id = self.GetNewId()
+            coil = LD_Coil(self, values["type"], values["name"], id)
+            coil.SetPosition(startx, starty + (LD_LINE_SIZE - LD_ELEMENT_SIZE[1]) / 2)
+            coil_connectors = coil.GetConnectors()
+            self.AddBlock(coil)
+            rung.SelectElement(coil)
+            self.Controler.AddEditedElementCoil(self.TagName, id)
+            
+            # Create Wire between LeftPowerRail and Coil
+            wire = Wire(self)
+            start_connector = coil_connectors["inputs"][0]
+            end_connector = leftpowerrail_connectors["outputs"][0]
+            start_connector.Connect((wire, 0), False)
+            end_connector.Connect((wire, -1), False)
+            wire.ConnectStartPoint(None, start_connector)
+            wire.ConnectEndPoint(None, end_connector)
+            self.AddWire(wire)
+            rung.SelectElement(wire)
+            
+            # Create RightPowerRail
+            id = self.GetNewId()
+            rightpowerrail = LD_PowerRail(self, RIGHTRAIL, id)
+            rightpowerrail.SetPosition(startx, starty)
+            rightpowerrail_connectors = rightpowerrail.GetConnectors()
+            self.AddBlock(rightpowerrail)
+            rung.SelectElement(rightpowerrail)
+            self.Controler.AddEditedElementPowerRail(self.TagName, id, RIGHTRAIL)
+            
+            # Create Wire between LeftPowerRail and Coil
+            wire = Wire(self)
+            start_connector = rightpowerrail_connectors["inputs"][0]
+            end_connector = coil_connectors["outputs"][0]
+            start_connector.Connect((wire, 0), False)
+            end_connector.Connect((wire, -1), False)
+            wire.ConnectStartPoint(None, start_connector)
+            wire.ConnectEndPoint(None, end_connector)
+            self.AddWire(wire)
+            rung.SelectElement(wire)
+            self.RefreshPosition(coil)
+            self.Rungs.append(rung)
+            self.RefreshBuffer()
+            self.RefreshScrollBars()
+            self.RefreshVisibleElements()
+            self.Refresh(False)
+
+    def AddLadderContact(self):
+        wires = []
+        if self.IsWire(self.SelectedElement):
+            left_element = self.SelectedElement.EndConnected
+            if not isinstance(left_element.GetParentBlock(), LD_Coil):
+                wires.append(self.SelectedElement)
+        elif self.SelectedElement and isinstance(self.SelectedElement,Graphic_Group):
+            if False not in [self.IsWire(element) for element in self.SelectedElement.GetElements()]:
+                for element in self.SelectedElement.GetElements():
+                    wires.append(element)
+        if len(wires) > 0:
+            dialog = LDElementDialog(self.ParentWindow, self.Controler, "contact")
+            dialog.SetPreviewFont(self.GetFont())
+            varlist = []
+            vars = self.Controler.GetEditedElementInterfaceVars(self.TagName, self.Debug)
+            if vars:
+                for var in vars:
+                    if var["Class"] != "Output" and var["Type"] == "BOOL":
+                        varlist.append(var["Name"])
+            dialog.SetVariables(varlist)
+            dialog.SetValues({"name":"","type":CONTACT_NORMAL})
+            if dialog.ShowModal() == wx.ID_OK:
+                values = dialog.GetValues()
+                points = wires[0].GetSelectedSegmentPoints()
+                id = self.GetNewId()
+                contact = LD_Contact(self, values["type"], values["name"], id)
+                contact.SetPosition(0, points[0].y - (LD_ELEMENT_SIZE[1] + 1) / 2)
+                self.AddBlock(contact)
+                self.Controler.AddEditedElementContact(self.TagName, id)
+                rungindex = self.FindRung(wires[0])
+                rung = self.Rungs[rungindex]
+                old_bbox = rung.GetBoundingBox()
+                rung.SelectElement(contact)
+                connectors = contact.GetConnectors()
+                left_elements = []
+                right_elements = []
+                left_index = []
+                right_index = []
+                for wire in wires:
+                    if wire.EndConnected not in left_elements:
+                        left_elements.append(wire.EndConnected)
+                        left_index.append(wire.EndConnected.GetWireIndex(wire))
+                    else:
+                        idx = left_elements.index(wire.EndConnected)
+                        left_index[idx] = min(left_index[idx], wire.EndConnected.GetWireIndex(wire))
+                    if wire.StartConnected not in right_elements:
+                        right_elements.append(wire.StartConnected)
+                        right_index.append(wire.StartConnected.GetWireIndex(wire))
+                    else:
+                        idx = right_elements.index(wire.StartConnected)
+                        right_index[idx] = min(right_index[idx], wire.StartConnected.GetWireIndex(wire))
+                    wire.SetSelectedSegment(None)
+                    wire.Clean()
+                    rung.SelectElement(wire)
+                    self.RemoveWire(wire)
+                wires = []
+                right_wires = []
+                for i, left_element in enumerate(left_elements):
+                    wire = Wire(self)
+                    wires.append(wire)
+                    connectors["inputs"][0].Connect((wire, 0), False)
+                    left_element.InsertConnect(left_index[i], (wire, -1), False)
+                    wire.ConnectStartPoint(None, connectors["inputs"][0])
+                    wire.ConnectEndPoint(None, left_element)
+                for i, right_element in enumerate(right_elements):
+                    wire = Wire(self)
+                    wires.append(wire)
+                    right_wires.append(wire)
+                    right_element.InsertConnect(right_index[i], (wire, 0), False)
+                    connectors["outputs"][0].Connect((wire, -1), False)
+                    wire.ConnectStartPoint(None, right_element)
+                    wire.ConnectEndPoint(None, connectors["outputs"][0])
+                right_wires.reverse()
+                for wire in wires:
+                    self.AddWire(wire)
+                    rung.SelectElement(wire)
+                self.RefreshPosition(contact)
+                if len(right_wires) > 1:
+                    group = Graphic_Group(self)
+                    group.SetSelected(False)
+                    for wire in right_wires:
+                        wire.SetSelectedSegment(-1)
+                        group.SelectElement(wire)
+                    self.SelectedElement = group
+                else:
+                    right_wires[0].SetSelectedSegment(-1)
+                    self.SelectedElement = right_wires[0]
+                rung.RefreshBoundingBox()
+                new_bbox = rung.GetBoundingBox()
+                self.RefreshRungs(new_bbox.height - old_bbox.height, rungindex + 1)
+                self.RefreshBuffer()
+                self.RefreshScrollBars()
+                self.RefreshVisibleElements()
+                self.Refresh(False)
+        else:
+            message = wx.MessageDialog(self, _("You must select the wire where a contact should be added!"), _("Error"), wx.OK|wx.ICON_ERROR)
+            message.ShowModal()
+            message.Destroy()
+
+    def AddLadderBranch(self):
+        blocks = []
+        if self.IsBlock(self.SelectedElement):
+            blocks = [self.SelectedElement]
+        elif isinstance(self.SelectedElement, Graphic_Group):
+            elements = self.SelectedElement.GetElements()
+            for element in elements:
+                blocks.append(element)
+        if len(blocks) > 0:
+            blocks_infos = []
+            left_elements = []
+            left_index = []
+            right_elements = []
+            right_index = []
+            for block in blocks:
+                connectors = block.GetConnectors()
+                block_infos = {"lefts":[],"rights":[]}
+                block_infos.update(connectors)
+                for connector in block_infos["inputs"]:
+                    for wire, handle in connector.GetWires():
+                        found = False
+                        for infos in blocks_infos:
+                            if wire.EndConnected in infos["outputs"]:
+                                for left_element in infos["lefts"]:
+                                    if left_element not in block_infos["lefts"]:
+                                        block_infos["lefts"].append(left_element)
+                                found = True
+                        if not found and wire.EndConnected not in block_infos["lefts"]:
+                            block_infos["lefts"].append(wire.EndConnected)
+                            if wire.EndConnected not in left_elements:
+                                left_elements.append(wire.EndConnected)
+                                left_index.append(wire.EndConnected.GetWireIndex(wire))
+                            else:
+                                index = left_elements.index(wire.EndConnected)
+                                left_index[index] = max(left_index[index], wire.EndConnected.GetWireIndex(wire))
+                for connector in block_infos["outputs"]:
+                    for wire, handle in connector.GetWires():
+                        found = False
+                        for infos in blocks_infos:
+                            if wire.StartConnected in infos["inputs"]:
+                                for right_element in infos["rights"]:
+                                    if right_element not in block_infos["rights"]:
+                                        block_infos["rights"].append(right_element)
+                                found = True
+                        if not found and wire.StartConnected not in block_infos["rights"]:
+                            block_infos["rights"].append(wire.StartConnected)
+                            if wire.StartConnected not in right_elements:
+                                right_elements.append(wire.StartConnected)
+                                right_index.append(wire.StartConnected.GetWireIndex(wire))
+                            else:
+                                index = right_elements.index(wire.StartConnected)
+                                right_index[index] = max(right_index[index], wire.StartConnected.GetWireIndex(wire))
+                for connector in block_infos["inputs"]:
+                    for infos in blocks_infos:
+                        if connector in infos["rights"]:
+                            infos["rights"].remove(connector)
+                            if connector in right_elements:
+                                index = right_elements.index(connector)
+                                right_elements.pop(index)
+                                right_index.pop(index)
+                            for right_element in block_infos["rights"]:
+                                if right_element not in infos["rights"]:
+                                    infos["rights"].append(right_element)
+                for connector in block_infos["outputs"]:
+                    for infos in blocks_infos:
+                        if connector in infos["lefts"]:
+                            infos["lefts"].remove(connector)
+                            if connector in left_elements:
+                                index = left_elements.index(connector)
+                                left_elements.pop(index)
+                                left_index.pop(index)
+                            for left_element in block_infos["lefts"]:
+                                if left_element not in infos["lefts"]:
+                                    infos["lefts"].append(left_element)
+                blocks_infos.append(block_infos)
+            for infos in blocks_infos:
+                left_elements = [element for element in infos["lefts"]]
+                for left_element in left_elements:
+                    if isinstance(left_element.GetParentBlock(), LD_PowerRail):
+                        infos["lefts"].remove(left_element)
+                        if "LD_PowerRail" not in infos["lefts"]:
+                            infos["lefts"].append("LD_PowerRail")
+                right_elements = [element for element in infos["rights"]]
+                for right_element in right_elements:
+                    if isinstance(right_element.GetParentBlock(), LD_PowerRail):
+                        infos["rights"].remove(right_element)
+                        if "LD_PowerRail" not in infos["rights"]:
+                            infos["rights"].append("LD_PowerRail")
+                infos["lefts"].sort()
+                infos["rights"].sort()
+            lefts = blocks_infos[0]["lefts"]
+            rights = blocks_infos[0]["rights"]
+            good = True
+            for infos in blocks_infos[1:]:
+                good &= infos["lefts"] == lefts
+                good &= infos["rights"] == rights
+            if good:
+                rungindex = self.FindRung(blocks[0])
+                rung = self.Rungs[rungindex]
+                old_bbox = rung.GetBoundingBox()
+                left_powerrail = True
+                right_powerrail = True
+                for element in left_elements:
+                    left_powerrail &= isinstance(element.GetParentBlock(), LD_PowerRail)
+                for element in right_elements:
+                    right_powerrail &= isinstance(element.GetParentBlock(), LD_PowerRail)
+                if not left_powerrail or not right_powerrail:
+                    wires = []
+                    if left_powerrail:
+                        powerrail = left_elements[0].GetParentBlock()
+                        index = 0
+                        for left_element in left_elements: 
+                            index = max(index, powerrail.GetConnectorIndex(left_element))
+                        powerrail.InsertConnector(index + 1)
+                        powerrail.RefreshModel()
+                        connectors = powerrail.GetConnectors()
+                        right_elements.reverse()
+                        for i, right_element in enumerate(right_elements):
+                            new_wire = Wire(self)
+                            wires.append(new_wire)
+                            right_element.InsertConnect(right_index[i] + 1, (new_wire, 0), False)
+                            connectors["outputs"][index + 1].Connect((new_wire, -1), False)
+                            new_wire.ConnectStartPoint(None, right_element)
+                            new_wire.ConnectEndPoint(None, connectors["outputs"][index + 1])
+                        right_elements.reverse()
+                    elif right_powerrail:
+                        dialog = LDElementDialog(self.ParentWindow, self.Controleur, "coil")
+                        dialog.SetPreviewFont(self.GetFont())
+                        varlist = []
+                        vars = self.Controler.GetEditedElementInterfaceVars(self.TagName, self.Debug)
+                        if vars:
+                            for var in vars:
+                                if var["Class"] != "Input" and var["Type"] == "BOOL":
+                                    varlist.append(var["Name"])
+                        returntype = self.Controler.GetEditedElementInterfaceReturnType(self.TagName, self.Debug)
+                        if returntype == "BOOL":
+                            varlist.append(self.Controler.GetEditedElementName(self.TagName))
+                        dialog.SetVariables(varlist)
+                        dialog.SetValues({"name":"","type":COIL_NORMAL})
+                        if dialog.ShowModal() == wx.ID_OK:
+                            values = dialog.GetValues()
+                            powerrail = right_elements[0].GetParentBlock()
+                            index = 0
+                            for right_element in right_elements: 
+                                index = max(index, powerrail.GetConnectorIndex(right_element))
+                            powerrail.InsertConnector(index + 1)
+                            powerrail.RefreshModel()
+                            connectors = powerrail.GetConnectors()
+                            
+                            # Create Coil
+                            id = self.GetNewId()
+                            coil = LD_Coil(self, values["type"], values["name"], id)
+                            pos = blocks[0].GetPosition()
+                            coil.SetPosition(pos[0], pos[1] + LD_LINE_SIZE)
+                            self.AddBlock(coil)
+                            rung.SelectElement(coil)
+                            self.Controler.AddEditedElementCoil(self.TagName, id)
+                            coil_connectors = coil.GetConnectors()
+                            
+                            # Create Wire between LeftPowerRail and Coil
+                            wire = Wire(self)
+                            connectors["inputs"][index + 1].Connect((wire, 0), False)
+                            coil_connectors["outputs"][0].Connect((wire, -1), False)
+                            wire.ConnectStartPoint(None, connectors["inputs"][index + 1])
+                            wire.ConnectEndPoint(None, coil_connectors["outputs"][0])
+                            self.AddWire(wire)
+                            rung.SelectElement(wire)
+                            left_elements.reverse()
+                            
+                            for i, left_element in enumerate(left_elements):
+                                # Create Wire between LeftPowerRail and Coil
+                                new_wire = Wire(self)
+                                wires.append(new_wire)
+                                coil_connectors["inputs"][0].Connect((new_wire, 0), False)
+                                left_element.InsertConnect(left_index[i] + 1, (new_wire, -1), False)
+                                new_wire.ConnectStartPoint(None, coil_connectors["inputs"][0])
+                                new_wire.ConnectEndPoint(None, left_element)
+                            
+                            self.RefreshPosition(coil)
+                    else:
+                        left_elements.reverse()
+                        right_elements.reverse()
+                        for i, left_element in enumerate(left_elements):
+                            for j, right_element in enumerate(right_elements):
+                                exist = False
+                                for wire, handle in right_element.GetWires():
+                                    exist |= wire.EndConnected == left_element
+                                if not exist:
+                                    new_wire = Wire(self)
+                                    wires.append(new_wire)
+                                    right_element.InsertConnect(right_index[j] + 1, (new_wire, 0), False)
+                                    left_element.InsertConnect(left_index[i] + 1, (new_wire, -1), False)
+                                    new_wire.ConnectStartPoint(None, right_element)
+                                    new_wire.ConnectEndPoint(None, left_element)
+                    wires.reverse()
+                    for wire in wires:
+                        self.AddWire(wire)
+                        rung.SelectElement(wire)
+                    right_elements.reverse()
+                for block in blocks:
+                    self.RefreshPosition(block)
+                for right_element in right_elements:
+                    self.RefreshPosition(right_element.GetParentBlock())
+                self.SelectedElement.RefreshBoundingBox()
+                rung.RefreshBoundingBox()
+                new_bbox = rung.GetBoundingBox()
+                self.RefreshRungs(new_bbox.height - old_bbox.height, rungindex + 1)
+                self.RefreshBuffer()
+                self.RefreshScrollBars()
+                self.RefreshVisibleElements()
+                self.Refresh(False)
+            else:
+                message = wx.MessageDialog(self, _("The group of block must be coherent!"), _("Error"), wx.OK|wx.ICON_ERROR)
+                message.ShowModal()
+                message.Destroy()
+        else:
+            message = wx.MessageDialog(self, _("You must select the block or group of blocks around which a branch should be added!"), _("Error"), wx.OK|wx.ICON_ERROR)
+            message.ShowModal()
+            message.Destroy()
+
+    def AddLadderBlock(self):
+        message = wx.MessageDialog(self, _("This option isn't available yet!"), _("Warning"), wx.OK|wx.ICON_EXCLAMATION)
+        message.ShowModal()
+        message.Destroy()
+
+#-------------------------------------------------------------------------------
+#                          Delete element functions
+#-------------------------------------------------------------------------------
+
+    def DeleteContact(self, contact):
+        if self.GetDrawingMode() == FREEDRAWING_MODE:
+            Viewer.DeleteContact(self, contact)
+        else:
+            rungindex = self.FindRung(contact)
+            rung = self.Rungs[rungindex]
+            old_bbox = rung.GetBoundingBox()
+            connectors = contact.GetConnectors()
+            input_wires = [wire for wire, handle in connectors["inputs"][0].GetWires()]
+            output_wires = [wire for wire, handle in connectors["outputs"][0].GetWires()]
+            left_elements = [(wire.EndConnected, wire.EndConnected.GetWireIndex(wire)) for wire in input_wires]
+            right_elements = [(wire.StartConnected, wire.StartConnected.GetWireIndex(wire)) for wire in output_wires]
+            for wire in input_wires:
+                wire.Clean()
+                rung.SelectElement(wire)
+                self.RemoveWire(wire)
+            for wire in output_wires:
+                wire.Clean()
+                rung.SelectElement(wire)
+                self.RemoveWire(wire)
+            rung.SelectElement(contact)
+            contact.Clean()
+            left_elements.reverse()
+            right_elements.reverse()
+            powerrail = len(left_elements) == 1 and isinstance(left_elements[0][0].GetParentBlock(), LD_PowerRail)
+            for left_element, left_index in left_elements:
+                for right_element, right_index in right_elements:
+                    wire_removed = []
+                    for wire, handle in right_element.GetWires():
+                        if wire.EndConnected == left_element:
+                            wire_removed.append(wire)
+                        elif isinstance(wire.EndConnected.GetParentBlock(), LD_PowerRail) and powerrail:
+                            left_powerrail = wire.EndConnected.GetParentBlock()
+                            index = left_powerrail.GetConnectorIndex(wire.EndConnected)
+                            left_powerrail.DeleteConnector(index)
+                            wire_removed.append(wire)
+                    for wire in wire_removed:
+                        wire.Clean()
+                        self.RemoveWire(wire)
+                        rung.SelectElement(wire)
+            wires = []
+            for left_element, left_index in left_elements:
+                for right_element, right_index in right_elements:
+                    wire = Wire(self)
+                    wires.append(wire)
+                    right_element.InsertConnect(right_index, (wire, 0), False)
+                    left_element.InsertConnect(left_index, (wire, -1), False)
+                    wire.ConnectStartPoint(None, right_element)
+                    wire.ConnectEndPoint(None, left_element)
+            wires.reverse()
+            for wire in wires:
+                self.AddWire(wire)
+                rung.SelectElement(wire)
+            right_elements.reverse()
+            for right_element, right_index in right_elements:
+                self.RefreshPosition(right_element.GetParentBlock())
+            self.RemoveBlock(contact)
+            self.Controler.RemoveEditedElementInstance(self.TagName, contact.GetId())
+            rung.RefreshBoundingBox()
+            new_bbox = rung.GetBoundingBox()
+            self.RefreshRungs(new_bbox.height - old_bbox.height, rungindex + 1)
+            self.SelectedElement = None
+
+    def RecursiveDeletion(self, element, rung):
+        connectors = element.GetConnectors()
+        input_wires = [wire for wire, handle in connectors["inputs"][0].GetWires()]
+        left_elements = [wire.EndConnected for wire in input_wires]
+        rung.SelectElement(element)
+        element.Clean()
+        for wire in input_wires:
+            wire.Clean()
+            self.RemoveWire(wire)
+            rung.SelectElement(wire)
+        self.RemoveBlock(element)
+        self.Controler.RemoveEditedElementInstance(self.TagName, element.GetId())
+        for left_element in left_elements:
+            block = left_element.GetParentBlock()
+            if len(left_element.GetWires()) == 0:
+                self.RecursiveDeletion(block, rung)
+            else:
+                self.RefreshPosition(block)
+
+    def DeleteCoil(self, coil):
+        if self.GetDrawingMode() == FREEDRAWING_MODE:
+            Viewer.DeleteContact(self, coil)
+        else:
+            rungindex = self.FindRung(coil)
+            rung = self.Rungs[rungindex]
+            old_bbox = rung.GetBoundingBox()
+            nbcoils = 0
+            for element in rung.GetElements():
+                if isinstance(element, LD_Coil):
+                    nbcoils += 1
+            if nbcoils > 1:
+                connectors = coil.GetConnectors()
+                output_wires = [wire for wire, handle in connectors["outputs"][0].GetWires()]
+                right_elements = [wire.StartConnected for wire in output_wires]
+                for wire in output_wires:
+                    wire.Clean()
+                    self.Wires.remove(wire)
+                    self.Elements.remove(wire)
+                    rung.SelectElement(wire)
+                for right_element in right_elements:
+                    right_block = right_element.GetParentBlock()
+                    if isinstance(right_block, LD_PowerRail):
+                        if len(right_element.GetWires()) == 0:
+                            index = right_block.GetConnectorIndex(right_element)
+                            right_block.DeleteConnector(index)
+                            powerrail_connectors = right_block.GetConnectors()
+                            for connector in powerrail_connectors["inputs"]:
+                                for wire, handle in connector.GetWires():
+                                    block = wire.EndConnected.GetParentBlock()
+                                    endpoint = wire.EndConnected.GetPosition(False)
+                                    startpoint = connector.GetPosition(False)
+                                    block.Move(0, startpoint.y - endpoint.y)
+                                    self.RefreshPosition(block)
+                self.RecursiveDeletion(coil, rung)
+            else:
+                for element in rung.GetElements():
+                    if self.IsWire(element):
+                        element.Clean()
+                        self.RemoveWire(element)
+                for element in rung.GetElements():
+                    if self.IsBlock(element):
+                        self.Controler.RemoveEditedElementInstance(self.TagName, element.GetId())
+                        self.RemoveBlock(element)
+                self.Controler.RemoveEditedElementInstance(self.TagName, self.Comments[rungindex].GetId())
+                self.RemoveComment(self.RungComments[rungindex])
+                self.RungComments.pop(rungindex)
+                self.Rungs.pop(rungindex)
+                if rungindex < len(self.Rungs):
+                    next_bbox = self.Rungs[rungindex].GetBoundingBox()
+                    self.RefreshRungs(old_bbox.y - next_bbox.y, rungindex)
+            self.SelectedElement = None
+
+    def DeleteWire(self, wire):
+        if self.GetDrawingMode() == FREEDRAWING_MODE:
+            Viewer.DeleteWire(self, wire)
+        else:
+            wires = []
+            left_elements = []
+            right_elements = []
+            if self.IsWire(wire):
+                wires = [wire]
+            elif isinstance(wire, Graphic_Group):
+                for element in wire.GetElements():
+                    if self.IsWire(element):
+                        wires.append(element)
+                    else:
+                        wires = []
+                        break
+            if len(wires) > 0:
+                rungindex = self.FindRung(wires[0])
+                rung = self.Rungs[rungindex]
+                old_bbox = rung.GetBoundingBox()
+                for wire in wires:
+                    connections = wire.GetSelectedSegmentConnections()
+                    left_block = wire.EndConnected.GetParentBlock()
+                    if wire.EndConnected not in left_elements:
+                        left_elements.append(wire.EndConnected)
+                    if wire.StartConnected not in right_elements:
+                        right_elements.append(wire.StartConnected)
+                    if connections == (False, False) or connections == (False, True) and isinstance(left_block, LD_PowerRail):
+                        wire.Clean()
+                        self.RemoveWire(wire)
+                        rung.SelectElement(wire)
+                for left_element in left_elements:
+                    left_block = left_element.GetParentBlock()
+                    if isinstance(left_block, LD_PowerRail):
+                        if len(left_element.GetWires()) == 0:
+                            index = left_block.GetConnectorIndex(left_element)
+                            left_block.DeleteConnector(index)
+                    else:
+                        connectors = left_block.GetConnectors()
+                        for connector in connectors["outputs"]:
+                            for wire, handle in connector.GetWires():
+                                self.RefreshPosition(wire.StartConnected.GetParentBlock())
+                for right_element in right_elements:
+                    self.RefreshPosition(right_element.GetParentBlock())
+                rung.RefreshBoundingBox()
+                new_bbox = rung.GetBoundingBox()
+                self.RefreshRungs(new_bbox.height - old_bbox.height, rungindex + 1)
+                self.SelectedElement = None
+
+#-------------------------------------------------------------------------------
+#                        Refresh element position functions
+#-------------------------------------------------------------------------------
+
+    def RefreshPosition(self, element, recursive=True):
+        # If element is LeftPowerRail, no need to update position
+        if isinstance(element, LD_PowerRail) and element.GetType() == LEFTRAIL:
+            element.RefreshModel()
+            return
+        
+        # Extract max position of the elements connected to input
+        connectors = element.GetConnectors()
+        position = element.GetPosition()
+        maxx = 0
+        onlyone = []
+        for connector in connectors["inputs"]:
+            onlyone.append(len(connector.GetWires()) == 1)
+            for wire, handle in connector.GetWires():
+                onlyone[-1] &= len(wire.EndConnected.GetWires()) == 1
+                leftblock = wire.EndConnected.GetParentBlock()
+                pos = leftblock.GetPosition()
+                size = leftblock.GetSize()
+                maxx = max(maxx, pos[0] + size[0])
+        
+        # Refresh position of element
+        if isinstance(element, LD_Coil):
+            interval = LD_WIRECOIL_SIZE
+        else:
+            interval = LD_WIRE_SIZE
+        if False in onlyone:
+            interval += LD_WIRE_SIZE
+        movex = maxx + interval - position[0]
+        element.Move(movex, 0)
+        position = element.GetPosition()
+        
+        # Extract blocks connected to inputs
+        blocks = []
+        for i, connector in enumerate(connectors["inputs"]):
+            for j, (wire, handle) in enumerate(connector.GetWires()):
+                blocks.append(wire.EndConnected.GetParentBlock())
+        
+        for i, connector in enumerate(connectors["inputs"]):
+            startpoint = connector.GetPosition(False)
+            previous_blocks = []
+            block_list = []
+            start_offset = 0
+            if not onlyone[i]:
+                middlepoint = maxx + LD_WIRE_SIZE
+            for j, (wire, handle) in enumerate(connector.GetWires()):
+                block = wire.EndConnected.GetParentBlock()
+                if isinstance(element, LD_PowerRail):
+                    pos = block.GetPosition()
+                    size = leftblock.GetSize()
+                    movex = position[0] - LD_WIRE_SIZE - size[0] - pos[0]
+                    block.Move(movex, 0)
+                endpoint = wire.EndConnected.GetPosition(False)
+                if j == 0:
+                    if not onlyone[i] and wire.EndConnected.GetWireIndex(wire) > 0:
+                        start_offset = endpoint.y - startpoint.y
+                    offset = start_offset
+                else:
+                    offset = start_offset + LD_LINE_SIZE * CalcBranchSize(previous_blocks, blocks)
+                if block in block_list:
+                    wires = wire.EndConnected.GetWires()
+                    endmiddlepoint = wires[0][0].StartConnected.GetPosition(False)[0] - LD_WIRE_SIZE
+                    points = [startpoint, wx.Point(middlepoint, startpoint.y),
+                              wx.Point(middlepoint, startpoint.y + offset),
+                              wx.Point(endmiddlepoint, startpoint.y + offset),
+                              wx.Point(endmiddlepoint, endpoint.y), endpoint]
+                else:
+                    if startpoint.y + offset != endpoint.y:
+                        if isinstance(element, LD_PowerRail):
+                            element.MoveConnector(connector, startpoint.y - endpoint.y)
+                        elif isinstance(block, LD_PowerRail):
+                            block.MoveConnector(wire.EndConnected, startpoint.y - endpoint.y)
+                        else:
+                            block.Move(0, startpoint.y + offset - endpoint.y)
+                            self.RefreshPosition(block, False)
+                        endpoint = wire.EndConnected.GetPosition(False)
+                    if not onlyone[i]:
+                        points = [startpoint, wx.Point(middlepoint, startpoint.y),
+                                  wx.Point(middlepoint, endpoint.y), endpoint]
+                    else:
+                        points = [startpoint, endpoint]
+                wire.SetPoints(points, False)
+                previous_blocks.append(block)
+                blocks.remove(block)
+                ExtractNextBlocks(block, block_list)
+        
+        element.RefreshModel(False)
+        if recursive:
+            for connector in connectors["outputs"]:
+                for wire, handle in connector.GetWires():
+                    self.RefreshPosition(wire.StartConnected.GetParentBlock())
+    
+    def RefreshRungs(self, movey, fromidx):
+        if movey != 0:
+            for i in xrange(fromidx, len(self.Rungs)):
+                self.RungComments[i].Move(0, movey)
+                self.RungComments[i].RefreshModel()
+                self.Rungs[i].Move(0, movey)
+                for element in self.Rungs[i].GetElements():
+                    if self.IsBlock(element):
+                        self.RefreshPosition(element)
+
+#-------------------------------------------------------------------------------
+#                          Edit element content functions
+#-------------------------------------------------------------------------------
+
+    def EditPowerRailContent(self, powerrail):
+        if self.GetDrawingMode() == FREEDRAWING_MODE:
+            Viewer.EditPowerRailContent(self, powerrail)
+