--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/tests/projects/svghmi/py_ext_0@py_ext/pyfile.xml	Tue Jan 25 17:05:14 2022 +0100
@@ -0,0 +1,99 @@
+<?xml version='1.0' encoding='utf-8'?>
+<PyFile xmlns:xhtml="http://www.w3.org/1999/xhtml" xmlns:xsd="http://www.w3.org/2001/XMLSchema">
+  <variables>
+    <variable name="AlarmNotify" type="HMI_INT"/>
+    <variable name="SendAlarm" type="HMI_INT" onchange="TriggerAlarm"/>
+    <variable name="AlarmText" type="HMI_STRING" initial="'POS'"/>
+    <variable name="AlarmStatus" type="HMI_STRING" initial="'alarm'"/>
+  </variables>
+  <globals>
+    <xhtml:p><![CDATA[
+from twisted.web.resource import Resource
+import json, time, random, collections
+
+Alarms = []
+AlarmIndex = {}
+lastid = 0
+
+def TriggerAlarm(changed_var_name):
+    global Alarms, lastid
+    new_entry = [time.time(), PLCGlobals.AlarmText, PLCGlobals.AlarmStatus, lastid]
+    Alarms.append(new_entry)
+    AlarmIndex[lastid] = new_entry
+    lastid = lastid + 1
+    PLCGlobals.AlarmNotify = random.randint(0, 4294967296)
+
+class AlarmJsonResource(Resource):
+    def render_GET(self, request):
+        return ''
+
+    def render_POST(self, request):
+        newstr = request.content.getvalue()
+        newdata = json.loads(newstr)
+        args = newdata[u'args']
+        range_feedback = newdata[u'range']
+        slider_position = newdata[u'position']
+        visible = newdata[u'visible']
+        extra = newdata[u'extra']
+        options = newdata[u'options']
+
+        if len(options) == 1 :
+            action, = options
+            if action == "action_reset":
+                del Alarms[:]
+                AlarmIndex.clear()
+        elif len(options) == 2 :
+            action, alarmid = options
+            if action == "onClick[acknowledge]":
+                AlarmIndex[int(alarmid)][2] = "ack"
+
+        answer = self.renderTable(range_feedback, slider_position, visible, extra)
+        janswer = json.dumps(answer)
+        return janswer
+
+    def renderTable(self, old_range, old_position, visible, extra):
+        if len(extra) > 0 and extra[0] != "":
+            fAlarms = [alrm for alrm in Alarms if alrm[1].find(extra[0])!=-1]
+        else:
+            fAlarms = Alarms[:]
+        fAlarms.reverse()
+        new_range = len(fAlarms)
+        delta = new_range - visible
+        new_position = 0 if delta <= 0 else delta if old_position > delta else old_position
+        new_visible = new_range if delta <= 0 else visible
+        
+        visible_alarms = []
+        for ts, text, status, alarmid in fAlarms[new_position:new_position + new_visible]:
+            visible_alarms.append({
+                "time": time.ctime(ts),
+                "text": text, # TODO translate text
+                "status": status,
+                "alarmid": alarmid
+            })
+
+        return new_range, new_position, visible_alarms
+
+
+]]></xhtml:p>
+  </globals>
+  <init>
+    <xhtml:p><![CDATA[
+]]></xhtml:p>
+  </init>
+  <cleanup>
+    <xhtml:p><![CDATA[
+]]></xhtml:p>
+  </cleanup>
+  <start>
+    <xhtml:p><![CDATA[
+
+AddPathToSVGHMIServers("alarms", AlarmJsonResource)
+
+
+]]></xhtml:p>
+  </start>
+  <stop>
+    <xhtml:p><![CDATA[
+]]></xhtml:p>
+  </stop>
+</PyFile>