py_ext/PythonFileCTNMixin.py
author Laurent Bessard
Sun, 23 Sep 2012 23:56:53 +0200
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parent 738 413946c04c87
child 1061 02f371f3e063
permissions -rw-r--r--
Fix bug when modifying IEC_Channel
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import os
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from PLCControler import UndoBuffer
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from PythonEditor import PythonEditor
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from xml.dom import minidom
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from xmlclass import *
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import cPickle
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PythonClasses = GenerateClassesFromXSD(os.path.join(os.path.dirname(__file__), "py_ext_xsd.xsd")) 
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class PythonFileCTNMixin:
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    EditorType = PythonEditor
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    def __init__(self):
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        filepath = self.PythonFileName()
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        self.PythonCode = PythonClasses["Python"]()
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        if os.path.isfile(filepath):
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            xmlfile = open(filepath, 'r')
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            tree = minidom.parse(xmlfile)
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            xmlfile.close()
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            for child in tree.childNodes:
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                if child.nodeType == tree.ELEMENT_NODE and child.nodeName == "Python":
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                    self.PythonCode.loadXMLTree(child, ["xmlns", "xmlns:xsi", "xsi:schemaLocation"])
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                    self.CreatePythonBuffer(True)
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        else:
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            self.CreatePythonBuffer(False)
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            self.OnCTNSave()
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    def PythonFileName(self):
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        return os.path.join(self.CTNPath(), "py_ext.xml")
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    def GetFilename(self):
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        if self.PythonBuffer.IsCurrentSaved():
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            return "py_ext"
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        else:
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            return "~py_ext~"
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    def SetPythonCode(self, text):
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        self.PythonCode.settext(text)
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    def GetPythonCode(self):
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        return self.PythonCode.gettext()
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    def CTNTestModified(self):
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        return self.ChangesToSave or not self.PythonIsSaved()
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    def OnCTNSave(self):
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        filepath = self.PythonFileName()
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        text = "<?xml version=\"1.0\" encoding=\"UTF-8\" standalone=\"no\"?>\n"
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        extras = {"xmlns":"http://www.w3.org/2001/XMLSchema",
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                  "xmlns:xsi":"http://www.w3.org/2001/XMLSchema-instance",
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                  "xsi:schemaLocation" : "py_ext_xsd.xsd"}
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        text += self.PythonCode.generateXMLText("Python", 0, extras)
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        xmlfile = open(filepath,"w")
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        xmlfile.write(text.encode("utf-8"))
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        xmlfile.close()
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        self.MarkPythonAsSaved()
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        return True
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#-------------------------------------------------------------------------------
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#                      Current Buffering Management Functions
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#-------------------------------------------------------------------------------
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    """
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    Return a copy of the project
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    """
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    def Copy(self, model):
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        return cPickle.loads(cPickle.dumps(model))
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    def CreatePythonBuffer(self, saved):
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        self.Buffering = False
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        self.PythonBuffer = UndoBuffer(cPickle.dumps(self.PythonCode), saved)
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    def BufferPython(self):
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        self.PythonBuffer.Buffering(cPickle.dumps(self.PythonCode))
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    def StartBuffering(self):
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        self.Buffering = True
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    def EndBuffering(self):
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        if self.Buffering:
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            self.PythonBuffer.Buffering(cPickle.dumps(self.PythonCode))
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            self.Buffering = False
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    def MarkPythonAsSaved(self):
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        self.EndBuffering()
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        self.PythonBuffer.CurrentSaved()
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    def PythonIsSaved(self):
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        return self.PythonBuffer.IsCurrentSaved() and not self.Buffering
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    def LoadPrevious(self):
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        self.EndBuffering()
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        self.PythonCode = cPickle.loads(self.PythonBuffer.Previous())
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    def LoadNext(self):
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        self.PythonCode = cPickle.loads(self.PythonBuffer.Next())
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    def GetBufferState(self):
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        first = self.PythonBuffer.IsFirst() and not self.Buffering
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        last = self.PythonBuffer.IsLast()
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        return not first, not last
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