svgui/svgui_server.py
author Edouard Tisserant
Fri, 15 Jun 2018 09:48:05 +0200
changeset 2188 7f59aa398669
parent 1919 ccea0fa6ea91
child 2434 07f48018b6f5
permissions -rw-r--r--
WxGlade HMI extension now does only instanciate wx object who's name match extension's name. If no object match the name and no code is provided in 'start' user python code section, then a warning is issued
#!/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 os

from nevow import tags, loaders
import simplejson as json  # pylint: disable=import-error
import runtime.NevowServer as NS

svgfile = '%(svgfile)s'

svguiWidgets = {}

currentId = 0


def getNewId():
    global currentId
    currentId += 1
    return currentId


class SvguiWidget(object):

    def __init__(self, classname, id, **kwargs):
        self.classname = classname
        self.id = id
        self.attrs = kwargs.copy()
        self.inputs = {}
        self.outputs = {}
        self.inhibit = False
        self.changed = False

    def setinput(self, attrname, value):
        self.inputs[attrname] = value

    def getinput(self, attrname, default=None):
        if attrname not in self.inputs:
            self.inputs[attrname] = default
        return self.inputs[attrname]

    def setoutput(self, attrname, value):
        if self.outputs.get(attrname) != value:
            self.outputs[attrname] = value
            self.changed = True
            self.RefreshInterface()

    def updateoutputs(self, **kwargs):
        for attrname, value in kwargs.iteritems():
            if self.outputs.get(attrname) != value:
                self.outputs[attrname] = value
                self.changed = True
        self.RefreshInterface()

    def RefreshInterface(self):
        interface = website.getHMI()
        if isinstance(interface, SVGUI_HMI) and self.changed and not self.inhibit:
            self.changed = False
            d = interface.sendData(self)
            if d is not None:
                self.inhibit = True
                d.addCallback(self.InterfaceRefreshed)

    def InterfaceRefreshed(self, result):
        self.inhibit = False
        if self.changed:
            self.RefreshInterface()


def get_object_init_state(obj):
    # Convert objects to a dictionary of their representation
    attrs = obj.attrs.copy()
    attrs.update(obj.inputs)
    d = {
        '__class__': obj.classname,
        'id': obj.id,
        'kwargs': json.dumps(attrs),
    }
    return d


def get_object_current_state(obj):
    # Convert objects to a dictionary of their representation
    d = {
        '__class__': obj.classname,
        'id': obj.id,
        'kwargs': json.dumps(obj.outputs),
    }
    return d


class SVGUI_HMI(website.PLCHMI):
    jsClass = u"LiveSVGPage.LiveSVGWidget"

    docFactory = loaders.stan(tags.div(render=tags.directive('liveElement'))[
        tags.xml(loaders.xmlfile(os.path.join(NS.WorkingDir, svgfile))),
    ])

    def HMIinitialisation(self):
        gadgets = []
        for gadget in svguiWidgets.values():
            gadgets.append(unicode(json.dumps(gadget, default=get_object_init_state, indent=2), 'ascii'))
        d = self.callRemote('init', gadgets)
        d.addCallback(self.HMIinitialised)

    def sendData(self, data):
        if self.initialised:
            return self.callRemote('receiveData', unicode(json.dumps(data, default=get_object_current_state, indent=2), 'ascii'))
        return None

    def setattr(self, id, attrname, value):
        svguiWidgets[id].setinput(attrname, value)


def createSVGUIControl(*args, **kwargs):
    id = getNewId()
    gad = SvguiWidget(args[0], id, **kwargs)
    svguiWidgets[id] = gad
    gadget = [unicode(json.dumps(gad, default=get_object_init_state, indent=2), 'ascii')]
    interface = website.getHMI()
    if isinstance(interface, SVGUI_HMI) and interface.initialised:
        interface.callRemote('init', gadget)
    return id


def setAttr(id, attrname, value):
    gad = svguiWidgets.get(id, None)
    if gad is not None:
        gad.setoutput(attrname, value)


def updateAttr(id, **kwargs):
    gad = svguiWidgets.get(id, None)
    if gad is not None:
        gad.updateoutput(**kwargs)


def getAttr(id, attrname, default=None):
    gad = svguiWidgets.get(id, None)
    if gad is not None:
        return gad.getinput(attrname, default)
    return default