KeyPress Events on Maya viewport

import sip
import maya.OpenMayaUI as OpenMayaUI
from PyQt4 import QtGui, QtCore

class MouseEventFilter(QtCore.QObject):
    def eventFilter(self, obj, event):
        typ = event.type()
        if typ == event.Enter or typ == event.MouseButtonPress:
            print "mouse enter"
            obj.setFocus()
        elif typ == event.Leave:
            print "mouse leave"
            obj.clearFocus()
        elif typ == event.KeyPress:
            print "working..."
            return True
        return False

view = OpenMayaUI.M3dView.active3dView()
widget = sip.wrapinstance(long(view.widget()), QtCore.QObject)
eventFilter = MouseEventFilter()
widget.installEventFilter(eventFilter)

widget.removeEventFilter(eventFilter)
eventFilter.deleteLater()