1 #!/usr/bin/python

     2 # -*- coding: utf-8 -*-

     3 

     4 import os

     5 

     6 from nevow import rend, appserver, inevow, tags, loaders, athena

     7 import simplejson as json

     8 

     9 svgfile = '%(svgfile)s'

    10 

    11 svguiWidgets={}

    12 

    13 class SvguiWidget:

    14     

    15     def __init__(self, classname, back_id, **kwargs):

    16         self.classname = classname

    17         self.back_id = back_id

    18         self.attrs = kwargs.copy()

    19         self.lastattrs = kwargs.copy()

    20         self.inhibit = False

    21         self.changed = False

    22 

    23     def setattr(self, attrname, value):

    24         self.attrs[attrname] = value

    25         

    26     def getattr(self, attrname):

    27         return self.args.get(attrname, None)

    28 

    29     def update(self, **kwargs):

    30         for attrname, value in kwargs.iteritems():

    31             if self.lastattrs.get(attrname, None) != value:

    32                 self.changed = True

    33                 self.attrs[attrname] = value

    34                 self.lastattrs[attrname] = value

    35         interface = website.getHMI()

    36         if interface is not None and self.changed and not self.inhibit:

    37             self.changed = False

    38             interface.sendData(self)

    39         

    40         return self.attrs["state"]

    41 

    42 def convert_to_builtin_type(obj):

    43     # Convert objects to a dictionary of their representation

    44     d = { '__class__':obj.classname,

    45           'back_id':obj.back_id,

    46           'kwargs':json.dumps(obj.attrs),

    47           }

    48     return d

    49 

    50 def dataToSend():

    51     gadgets = []

    52     for gadget in svguiWidgets.values():

    53         gadgets.append(unicode(json.dumps(gadget, default=convert_to_builtin_type, indent=2), 'ascii'))

    54     return gadgets

    55 

    56 

    57 class SVGUI_HMI(athena.LiveElement):

    58     jsClass = u"LiveSVGPage.LiveSVGWidget"

    59     

    60     docFactory = loaders.stan(tags.div(render=tags.directive('liveElement'))[                                    

    61                                          tags.xml(loaders.xmlfile(os.path.join(WorkingDir, svgfile))),

    62                                          ])

    63 

    64     def sendData(self,data):

    65         objDefer = self.callRemote('receiveData',unicode(json.dumps(data, default=convert_to_builtin_type, indent=2), 'ascii'))

    66 

    67     def initClient(self):

    68         self.callRemote('init', dataToSend())

    69     

    70     def setattr(self, id, attrname, value):

    71         svguiWidgets[id].setattr(attrname, value)

    72 

    73 def SVGUI(*args, **kwargs):

    74     classname, back_id = args

    75     gad = svguiWidgets.get(back_id, None)

    76     if gad is None:

    77         gad = SvguiWidget(classname, back_id, **kwargs)

    78         svguiWidgets[back_id] = gad

    79         gadget = [unicode(json.dumps(gad, default=convert_to_builtin_type, indent=2), 'ascii')]

    80         interface = website.getHMI()

    81         if interface is not None:

    82             interface.callRemote('init', gadget)

    83 

    84     return gad.update(**kwargs)