taskpanel with webkit in freecad

from PyQt4 import QtCore, QtGui, QtWebKit
import Part
import FreeCADGui, FreeCAD

html = """
<HTML>
<HEAD>
<TITLE>Test Input</TITLE>
<SCRIPT LANGUAGE="JavaScript">
function testResults (form) {
    var lenVar = form.boxlength.value;
    var widthVar = form.boxwidth.value;
    var heightVar = form.boxheight.value;
    pyObj.newBox(lenVar,widthVar,heightVar);
}</SCRIPT>
</HEAD>
<BODY>
<FORM NAME="myform" ACTION="" METHOD="GET">
  <table> <TR>
      <TH align=right>Box Length:
      <TD><INPUT TYPE="text" NAME="boxlength" VALUE=""><TR>
      <TH align=right>Box Width:
      <TD><INPUT TYPE="text" NAME="boxwidth" VALUE=""><TR>
      <TH align=right>Box Height:
      <TD><INPUT TYPE="text" NAME="boxheight" VALUE=""><TR> </table>
<INPUT TYPE="button" NAME="button" Value="Draw Box" onClick="testResults(this.form)">
</FORM> </BODY> </HTML>
"""
class TestClass(QtCore.QObject):
    @QtCore.pyqtSlot(str,str,str)
    def newBox(self, msg1,msg2,msg3):
        l = float(msg1); w= float(msg2);h = float(msg3)
        box1 = Part.makeBox(l,w,h)
        Part.show(box1)

def getMainWindow():
    "returns the main window"
    # using QtGui.qApp.activeWindow() isn't very reliable because if another
    # widget than the mainwindow is active (e.g. a dialog) the wrong widget is
    # returned
    toplevel = QtGui.qApp.topLevelWidgets()
    for i in toplevel:
        if i.metaObject().className() == "Gui::MainWindow":
            return i
    raise Exception("No main window found")


def getComboView(mw):
    dw=mw.findChildren(QtGui.QDockWidget)
    for i in dw:
        if str(i.objectName()) == "Combo View":
            return i.findChild(QtGui.QTabWidget)
    raise Exception("No tab widget found")


myObj = TestClass()

a = QtGui.qApp
mw = getMainWindow()
tab = getComboView(getMainWindow())

tab2 = QtGui.QTabWidget(parent = mw)
web = QtWebKit.QWebView(tab2)
tab.addTab(tab2,"DrawBox")

v= web
#m.move(0,0)
#m.resize(200,200)
v.setHtml(html)
curr1 = v.page()
frame1 = curr1.currentFrame()
frame1.addToJavaScriptWindowObject("pyObj", myObj)