qevent - pyqt mouse held down eventfilter -

i new pyqt , can't figure out. trying install eventfilter when qpushbutton pressed , held down, system increments value @ rate (this qtimer). have second qpushbutton on same page when pressed , held, should decrememt value. system needs differentiate between single click , press , hold.here's have far, not bad confident there's more efficient way of doing this.

class app(qtgui.qmainwindow, app_ui_mainwindow):     def __init__(self, parent=none):         super(app, self).__init__(parent)         qtgui.qmainwindow.__init__(self)         app_ui_mainwindow.__init__(self)         self.setupui(self)          #set mouse , install event filter.         self.mouse_state = app.mousebuttons()         self.mouse_state == qtcore.qt.leftbutton         self.increment_button.installeventfilter(self)         self.decrement_button.installeventfilter(self)         self.hoveringover = 'null'          #timer when mouse held down.         self.mouseheld = qtcore.qtimer()         self.mouseheld.timeout.connect(self.update)         self.mouseheld.start(500) #trigger every second.         self.mouseheld.timeout.connect(self.mouse_held_event)      #to figure out which/if hovering on button.     def eventfilter(self, obj, event):         if event.type() == qtcore.qevent.enter:            self.hoveringover = obj.objectname()         elif event.type() == qtcore.qevent.leave:            self.hoveringover = 'null'         return super(app, self).eventfilter(obj, event)      def mouse_held_event(self):         #set mouse.         self.is_mouse_held = 1         self.mouse_state = app.mousebuttons()         self.mouse_state == qtcore.qt.leftbutton         if int(self.mouse_state) == 1:             if self.hoveringover == 'increment_button':                self.increment()             elif self.hoveringover == 'decrement_button':                self.decrement()