beremiz

Dirty fix for error '_object_has_no_attribute_'getSlave' in EtherCAT extension

2018-08-10, Andrey Skvortsov
a3ac46366b86
Dirty fix for error '_object_has_no_attribute_'getSlave' in EtherCAT extension

traceback:
File "/home/developer/WorkData/PLC/beremiz/beremiz/IDEFrame.py", line 1433, in OnPouSelectedChanged
window.RefreshView()
File "/home/developer/WorkData/PLC/beremiz/beremiz/etherlab/ConfigEditor.py", line 837, in RefreshView
self.RefreshProcessVariables()
File "/home/developer/WorkData/PLC/beremiz/beremiz/etherlab/ConfigEditor.py", line 886, in RefreshProcessVariables
slaves = self.Controler.GetSlaves(**self.CurrentNodesFilter)
File "/home/developer/WorkData/PLC/beremiz/beremiz/etherlab/EthercatMaster.py", line 341, in GetSlaves
for slave in self.Config.getConfig().getSlave():
:_'lxml.etree._Element'_object_has_no_attribute_'getSlave'

Steps to reproduce problem:

- Add new EtherCAT master
- Add new EthercatNode to the master
- double click on


this is looks like dirty hack to fix strange problem with initial[0]
changing its type after returning from _init_ method to lxml.etree._Element
As a result all methods generated by class factory are lost.

For example, in function initMethod initial[0].__class__ points to
xmlclass.xmlclass.Config. After map(self.append, initial)
self.Config.__class__ is 'xmlclass.xmlclass.Config' as well.
But after returning from initMethod (_init) in CreateElement
self.Config.__class__ has changed to lxml.etree._Element.


I've noticed similar behavior if copy/deepcopy is used for any child
of etree.ElementBase. See simple example below.
[-------------------------------------------------------------]
#!/usr/bin/python

from __future__ import print_function
from lxml import etree
import copy

class DefaultElementClass(etree.ElementBase):
def getLocalTag(self):
return etree.QName(self.tag).localname


def printInformation(x):
print(x, x.__class__, "getLocalTag" in dir(x))


a = DefaultElementClass()
printInformation(a)

#
printInformation(copy.copy(a))
printInformation(copy.deepcopy(a))
[-------------------------------------------------------------]
#!/usr/bin/env python
# -*- coding: utf-8 -*-
# This file is part of Beremiz, a Integrated Development Environment for
# programming IEC 61131-3 automates supporting plcopen standard and CanFestival.
#
# Copyright (C) 2007: Edouard TISSERANT and Laurent BESSARD
#
# See COPYING file for copyrights details.
#
# This program 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
# of the License, or (at your option) any later version.
#
# This program 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 program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
from __future__ import absolute_import
import wx
from graphics.GraphicCommons import GetScaledEventPosition
# -------------------------------------------------------------------------------
# Viewer RubberBand
# -------------------------------------------------------------------------------
class RubberBand(object):
"""
Class that implements a rubberband for graphic Viewers
"""
def __init__(self, viewer):
"""
Constructor
@param viewer: Viewer on which rubberband must be drawn
"""
self.Viewer = viewer
# wx.Panel on which rubberband will be drawn
self.DrawingSurface = viewer.Editor
self.Reset()
def Reset(self):
"""
Initialize internal attributes of rubberband
"""
self.StartPoint = None
self.CurrentBBox = None
self.LastBBox = None
def IsShown(self):
"""
Indicate if rubberband is drawn on viewer
@return: True if rubberband is drawn
"""
return self.CurrentBBox is not None
def GetCurrentExtent(self):
"""
Return the rubberband bounding box
@return: Rubberband bounding box (wx.Rect object)
"""
# In case of rubberband not shown, return the last rubberband
# bounding box
if self.IsShown():
return self.CurrentBBox
return self.LastBBox
def OnLeftDown(self, event, dc, scaling):
"""
Called when left mouse is pressed on Viewer. Starts to edit a new
rubberband bounding box
@param event: Mouse event
@param dc: Device Context of Viewer
@param scaling: PLCOpen scaling applied on Viewer
"""
# Save the point where mouse was pressed in Viewer unit, position may
# be modified by scroll and zoom applied on viewer
self.StartPoint = GetScaledEventPosition(event, dc, scaling)
# Initialize rubberband bounding box
self.CurrentBBox = wx.Rect(self.StartPoint.x, self.StartPoint.y, 0, 0)
# Change viewer mouse cursor to reflect a rubberband bounding box is
# edited
self.DrawingSurface.SetCursor(wx.StockCursor(wx.CURSOR_CROSS))
self.Redraw()
def OnMotion(self, event, dc, scaling):
"""
Called when mouse is dragging over Viewer. Update the current edited
rubberband bounding box
@param event: Mouse event
@param dc: Device Context of Viewer
@param scaling: PLCOpen scaling applied on Viewer
"""
# Get mouse position in Viewer unit, position may be modified by scroll
# and zoom applied on viewer
pos = GetScaledEventPosition(event, dc, scaling)
# Save the last bounding box drawn for erasing it later
self.LastBBox = wx.Rect(0, 0, 0, 0)
self.LastBBox.Union(self.CurrentBBox)
# Calculate new position and size of the box
self.CurrentBBox.x = min(pos.x, self.StartPoint.x)
self.CurrentBBox.y = min(pos.y, self.StartPoint.y)
self.CurrentBBox.width = abs(pos.x - self.StartPoint.x) + 1
self.CurrentBBox.height = abs(pos.y - self.StartPoint.y) + 1
self.Redraw()
def OnLeftUp(self, event, dc, scaling):
"""
Called when mouse is release from Viewer. Erase the current edited
rubberband bounding box
@param event: Mouse event
@param dc: Device Context of Viewer
@param scaling: PLCOpen scaling applied on Viewer
"""
# Change viewer mouse cursor to default
self.DrawingSurface.SetCursor(wx.NullCursor)
# Save the last edited bounding box
self.LastBBox = self.CurrentBBox
self.CurrentBBox = None
self.Redraw()
def DrawBoundingBoxes(self, bboxes, dc=None):
"""
Draw a list of bounding box on Viewer in the order given using XOR
logical function
@param bboxes: List of bounding boxes to draw on viewer
@param dc: Device Context of Viewer (default None)
"""
# Get viewer Device Context if not given
if dc is None:
dc = self.Viewer.GetLogicalDC()
# Save current viewer scale factors before resetting them in order to
# avoid rubberband pen to be scaled
scalex, scaley = dc.GetUserScale()
dc.SetUserScale(1, 1)
# Set DC drawing style
dc.SetPen(wx.Pen(wx.WHITE, style=wx.DOT))
dc.SetBrush(wx.TRANSPARENT_BRUSH)
dc.SetLogicalFunction(wx.XOR)
# Draw the bounding boxes using viewer scale factor
for bbox in bboxes:
if bbox is not None:
dc.DrawRectangle(
bbox.x * scalex, bbox.y * scaley,
bbox.width * scalex, bbox.height * scaley)
dc.SetLogicalFunction(wx.COPY)
# Restore Viewer scale factor
dc.SetUserScale(scalex, scaley)
def Redraw(self, dc=None):
"""
Redraw rubberband on Viewer
@param dc: Device Context of Viewer (default None)
"""
# Erase last bbox and draw current bbox
self.DrawBoundingBoxes([self.LastBBox, self.CurrentBBox], dc)
def Erase(self, dc=None):
"""
Erase rubberband from Viewer
@param dc: Device Context of Viewer (default None)
"""
# Erase last bbox
self.DrawBoundingBoxes([self.LastBBox], dc)
def Draw(self, dc=None):
"""
Draw rubberband on Viewer
@param dc: Device Context of Viewer (default None)
"""
# Erase last bbox and draw current bbox
self.DrawBoundingBoxes([self.CurrentBBox], dc)