svgui/svgui_server.py
author Laurent Bessard
Thu, 05 Sep 2013 10:36:33 +0200
changeset 1305 714f1381a09a
parent 728 e0424e96e3fd
child 1511 91538d0c242c
permissions -rw-r--r--
Fixed xmlclass and plcopen using precompile xpath where possible
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#!/usr/bin/python
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# -*- coding: utf-8 -*-
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import os
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from nevow import rend, appserver, inevow, tags, loaders, athena
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import simplejson as json
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svgfile = '%(svgfile)s'
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svguiWidgets = {}
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currentId = 0
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def getNewId():
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    global currentId
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    currentId += 1
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    return currentId
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class SvguiWidget:
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    def __init__(self, classname, id, **kwargs):
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        self.classname = classname
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        self.id = id
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        self.attrs = kwargs.copy()
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        self.inputs = {}
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        self.outputs = {}
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        self.inhibit = False
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        self.changed = False
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    def setinput(self, attrname, value):
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        self.inputs[attrname] = value
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    def getinput(self, attrname, default=None):
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        if not self.inputs.has_key(attrname):
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            self.inputs[attrname] = default
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        return self.inputs[attrname]
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    def setoutput(self, attrname, value):
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        if self.outputs.get(attrname) != value:
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            self.outputs[attrname] = value
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            self.changed = True
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            self.RefreshInterface()
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    def updateoutputs(self, **kwargs):
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        for attrname, value in kwargs.iteritems():
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            if self.outputs.get(attrname) != value:
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                self.outputs[attrname] = value
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                self.changed = True
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        self.RefreshInterface()
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    def RefreshInterface(self):
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        interface = website.getHMI()
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        if isinstance(interface, SVGUI_HMI) and self.changed and not self.inhibit:
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            self.changed = False
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            d = interface.sendData(self)
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            if d is not None:
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                self.inhibit = True
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                d.addCallback(self.InterfaceRefreshed)
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    def InterfaceRefreshed(self, result):
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        self.inhibit = False
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        if self.changed:
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            self.RefreshInterface()
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def get_object_init_state(obj):
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    # Convert objects to a dictionary of their representation
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    attrs = obj.attrs.copy()
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    attrs.update(obj.inputs)
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    d = { '__class__': obj.classname,
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          'id': obj.id,
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          'kwargs': json.dumps(attrs),
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          }
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    return d
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def get_object_current_state(obj):
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    # Convert objects to a dictionary of their representation
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    d = { '__class__': obj.classname,
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          'id': obj.id,
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          'kwargs': json.dumps(obj.outputs),
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          }
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    return d
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class SVGUI_HMI(website.PLCHMI):
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    jsClass = u"LiveSVGPage.LiveSVGWidget"
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    docFactory = loaders.stan(tags.div(render=tags.directive('liveElement'))[                                    
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                                         tags.xml(loaders.xmlfile(os.path.join(WorkingDir, svgfile))),
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                                         ])
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    def HMIinitialisation(self):
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        gadgets = []
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        for gadget in svguiWidgets.values():
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            gadgets.append(unicode(json.dumps(gadget, default=get_object_init_state, indent=2), 'ascii'))
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        d = self.callRemote('init', gadgets)
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        d.addCallback(self.HMIinitialised)
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    def sendData(self,data):
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        if self.initialised:
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            return self.callRemote('receiveData',unicode(json.dumps(data, default=get_object_current_state, indent=2), 'ascii'))
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        return None
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    def setattr(self, id, attrname, value):
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        svguiWidgets[id].setinput(attrname, value)
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def createSVGUIControl(*args, **kwargs):
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    id = getNewId()
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    gad = SvguiWidget(args[0], id, **kwargs)
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    svguiWidgets[id] = gad
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    gadget = [unicode(json.dumps(gad, default=get_object_init_state, indent=2), 'ascii')]
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    interface = website.getHMI()
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    if isinstance(interface, SVGUI_HMI) and interface.initialised:
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        interface.callRemote('init', gadget)
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    return id
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def setAttr(id, attrname, value):
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    gad = svguiWidgets.get(id, None)
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    if gad is not None:
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        gad.setoutput(attrname, value)
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def updateAttr(id, **kwargs):
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    gad = svguiWidgets.get(id, None)
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    if gad is not None:
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        gad.updateoutput(**kwargs)
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def getAttr(id, attrname, default=None):
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    gad = svguiWidgets.get(id, None)
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    if gad is not None:
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        return gad.getinput(attrname, default)
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    return default
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