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<?xml version='1.0' encoding='utf-8'?>

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<PyFile xmlns:xhtml="http://www.w3.org/1999/xhtml" xmlns:xsd="http://www.w3.org/2001/XMLSchema">

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  <variables>

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    <variable name="FileNotify" type="HMI_INT"/>

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    <variable name="CurrentPath" type="HMI_STRING" initial="..."/>

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    <variable name="FileName" type="HMI_STRING"/>

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  </variables>

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  <globals>

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    <xhtml:p><![CDATA[

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from twisted.web.resource import Resource

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from os import getcwd, listdir

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from os.path import dirname, isfile, join

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import collections, json

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class FilesJsonResource(Resource):

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    image_cache = {}

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    def render_GET(self, request):

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        request.setHeader('content-type', 'image/png')

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        img_name = request.args[b'name'][0].decode('utf-8')

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        p = getcwd()  + '/' + img_name

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        if p not in self.image_cache:

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            with open(p, 'rb') as image_file:

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                img_bytes = image_file.read()

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                self.image_cache[p] = img_bytes

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        else:

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            img_bytes = self.image_cache[p]

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        return img_bytes

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    def render_POST(self, request):

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        newstr = request.content.getvalue()

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        newdata = json.loads(newstr)

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        args = newdata['args']

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        range_feedback = newdata['range']

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        slider_position = newdata['position']

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        visible = newdata['visible']

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        extra = newdata['extra']

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        options = newdata['options']

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        path = PLCGlobals.CurrentPath

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        if path == '...':

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            PLCGlobals.CurrentPath = path = getcwd()

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        if len(options) == 1 :

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            action, = options

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            if action == 'action_reset':

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                PLCGlobals.CurrentPath = path = getcwd()

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        elif len(options) == 2 :

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            action, sent_path = options

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            if action == 'onClick[acknowledge]':

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                if sent_path.endswith('.csv'):

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                    PLCGlobals.FileName = sent_path

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                else:

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                    PLCGlobals.CurrentPath = path = sent_path

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        ld = listdir(path)

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        ld.sort()

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        if path != '/':

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            FileList = [

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                {

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                    'name': '..',

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                    'path': dirname(path),

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                    'type': 'folder',

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                    'status': 'active',

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                    'thumbnail': '/files?name=folder.png'

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                }

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            ]

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        else:

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            FileList = []

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        FileList.extend([

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            {

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                'name': f,

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                'path': join(path, f),

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                'type': 'folder',

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                'status': 'active',

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                'thumbnail': '/files?name=folder.png'

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            }

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            for f in ld

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            if not (isfile(join(path, f)) 

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            or f.startswith("."))

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        ])

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        FileList.extend([

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            {

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                'name': f,

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                'path': join(path, f),

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                'type': 'file',

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                'status': 'active',

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                'thumbnail': '/files?name=file.png'

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            }

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            for f in ld 

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            if isfile(join(path, f)) 

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            and f.endswith(".csv")

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        ])

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        answer = self.renderTable(

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            FileList, range_feedback, slider_position, visible, extra

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        )

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        janswer = json.dumps(answer)

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        return janswer.encode()

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    def renderTable(self, FileList, old_range, old_position, visible, extra):

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        if len(extra) > 0 and extra[0] != "":

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            fFiles = [fl for fl in FileList if extra[0] in fl]

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        else:

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            fFiles = FileList[:]

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        new_range = len(fFiles)

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        delta = new_range - visible

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        new_position = 0 if delta <= 0 else delta if old_position > delta else old_position

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        new_visible = new_range if delta <= 0 else visible

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        visible_files = []

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        for desc in fFiles[new_position:new_position + new_visible]:

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            visible_files.append(desc)

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        return new_range, new_position, visible_files

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   122

   123

]]></xhtml:p>

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  </globals>

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  <init>

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    <xhtml:p><![CDATA[

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]]></xhtml:p>

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  </init>

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  <cleanup>

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    <xhtml:p><![CDATA[

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]]></xhtml:p>

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  </cleanup>

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  <start>

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    <xhtml:p><![CDATA[

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AddPathToSVGHMIServers(b"files", FilesJsonResource)

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]]></xhtml:p>

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  </start>

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  <stop>

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    <xhtml:p><![CDATA[

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]]></xhtml:p>

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  </stop>

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</PyFile>