Runtime: Added PostStart methot to PLCObject, called after PLC is started, with all libraries and python object already created, and python extensions "Start" methods being called.
This is called before python thread processing py_eval blocks starts. Example purpose: attach additional ressource to web services
#!/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
# Copyright (C) 2017: Andrey Skvortsov <andrej.skvortzov@gmail.com>
#
# 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.SFC_Objects import SFC_Transition
from dialogs.BlockPreviewDialog import BlockPreviewDialog
# -------------------------------------------------------------------------------
# Set Transition Parameters Dialog
# -------------------------------------------------------------------------------
class SFCTransitionDialog(BlockPreviewDialog):
"""
Class that implements a dialog for defining parameters of a transition graphic
element
"""
def __init__(self, parent, controller, tagname, connection=True):
"""
Constructor
@param parent: Parent wx.Window of dialog for modal
@param controller: Reference to project controller
@param tagname: Tagname of project POU edited
@param connection: True if transition value can be defined by a
connection (default: True)
"""
BlockPreviewDialog.__init__(self, parent, controller, tagname,
title=_('Edit transition'))
# Init common sizers
self._init_sizers(2, 0, 8, None, 2, 1)
# Create label for transition type
type_label = wx.StaticText(self, label=_('Type:'))
self.LeftGridSizer.AddWindow(type_label, flag=wx.GROW)
# Create combo box for selecting reference value
reference = wx.ComboBox(self, style=wx.CB_READONLY)
reference.Append("")
for transition in controller.GetEditedElementTransitions(tagname):
reference.Append(transition)
self.Bind(wx.EVT_COMBOBOX, self.OnReferenceChanged, reference)
# Create Text control for defining inline value
inline = wx.TextCtrl(self)
self.Bind(wx.EVT_TEXT, self.OnInlineChanged, inline)
# Create radio buttons for selecting power rail type
self.TypeRadioButtons = {}
first = True
for type, label, control in [('reference', _('Reference'), reference),
('inline', _('Inline'), inline),
('connection', _('Connection'), None)]:
radio_button = wx.RadioButton(self, label=label,
style=(wx.RB_GROUP if first else 0))
radio_button.SetValue(first)
self.Bind(wx.EVT_RADIOBUTTON, self.OnTypeChanged, radio_button)
self.LeftGridSizer.AddWindow(radio_button, flag=wx.GROW)
if control is not None:
control.Enable(first)
self.LeftGridSizer.AddWindow(control, flag=wx.GROW)
self.TypeRadioButtons[type] = (radio_button, control)
first = False
# Create label for transition priority
priority_label = wx.StaticText(self, label=_('Priority:'))
self.LeftGridSizer.AddWindow(priority_label, flag=wx.GROW)
# Create spin control for defining priority value
self.Priority = wx.SpinCtrl(self, min=0, style=wx.SP_ARROW_KEYS)
self.Bind(wx.EVT_TEXT, self.OnPriorityChanged, self.Priority)
self.LeftGridSizer.AddWindow(self.Priority, flag=wx.GROW)
# Add preview panel and associated label to sizers
self.RightGridSizer.AddWindow(self.PreviewLabel, flag=wx.GROW)
self.RightGridSizer.AddWindow(self.Preview, flag=wx.GROW)
# Add buttons sizer to sizers
self.MainSizer.AddSizer(
self.ButtonSizer, border=20,
flag=wx.ALIGN_RIGHT | wx.BOTTOM | wx.LEFT | wx.RIGHT)
self.Fit()
# Reference radio button is default control having keyboard focus
self.TypeRadioButtons["reference"][0].SetFocus()
def GetTransitionType(self):
"""
Return type selected for SFC transition and associated value
@return: Type selected and associated value (None if no value)
"""
# Go through radio buttons and return type and value associated to the
# one that is selected
for type, (radio, control) in self.TypeRadioButtons.iteritems():
if radio.GetValue():
if isinstance(control, wx.ComboBox):
return type, control.GetStringSelection()
elif isinstance(control, wx.TextCtrl):
return type, control.GetValue()
else:
return type, None
return None, None
def SetValues(self, values):
"""
Set default SFC transition parameters
@param values: Transition parameters values
"""
# Extract transition value according to type
type_value = values.get("value", None)
# For each parameters defined, set corresponding control value
for name, value in values.items():
# Parameter is SFC transition priority
if name == "priority":
self.Priority.SetValue(values["priority"])
# Parameter is SFC transition type
elif name == "type":
for type, (radio, control) in self.TypeRadioButtons.iteritems():
radio.SetValue(type == value)
if control is not None:
# Enable associated control to type and set value
control.Enable(type == value)
if type == value:
if isinstance(control, wx.ComboBox):
control.SetStringSelection(type_value)
elif isinstance(control, wx.TextCtrl):
control.ChangeValue(type_value)
# Refresh preview panel
self.RefreshPreview()
def GetValues(self):
"""
Return SFC transition parameters defined in dialog
@return: {parameter_name: parameter_value,...}
"""
values = {"priority": self.Priority.GetValue()}
values["type"], values["value"] = self.GetTransitionType()
values["width"], values["height"] = self.Element.GetSize()
return values
def OnOK(self, event):
"""
Called when dialog OK button is pressed
Test if parameters defined are valid
@param event: wx.Event from OK button
"""
message = None
# Get transition type and value associated
type, value = self.GetTransitionType()
# Test that value associated to type is defined
if type != "connection" and value == "":
message = _("Form isn't complete. %s must be filled!") % type
# Show error message if an error is detected
if message is not None:
self.ShowErrorMessage(message)
else:
# Call BlockPreviewDialog function
BlockPreviewDialog.OnOK(self, event)
def OnTypeChanged(self, event):
"""
Called when transition type changed
@param event: wx.RadioButtonEvent
"""
# Refresh sensibility of control associated to transition types
for _type, (radio, control) in self.TypeRadioButtons.iteritems():
if control is not None:
control.Enable(radio.GetValue())
# Refresh preview panel
self.RefreshPreview()
event.Skip()
def OnReferenceChanged(self, event):
"""
Called when SFC transition reference value changed
@param event: wx.ComboBoxEvent
"""
self.RefreshPreview()
event.Skip()
def OnInlineChanged(self, event):
"""
Called when SFC transition inline value changed
@param event: wx.TextEvent
"""
self.RefreshPreview()
event.Skip()
def OnPriorityChanged(self, event):
"""
Called when block inputs number changed
@param event: wx.SpinEvent
"""
self.RefreshPreview()
event.Skip()
def DrawPreview(self):
"""
Refresh preview panel of graphic element
Override BlockPreviewDialog function
"""
# Set graphic element displayed, creating a SFC transition
self.Element = SFC_Transition(self.Preview)
self.Element.SetType(*self.GetTransitionType())
self.Element.SetPriority(self.Priority.GetValue())
# Call BlockPreviewDialog function
BlockPreviewDialog.DrawPreview(self)