#!/usr/bin/env python
# -*- coding: UTF-8 -*-

from PyQt4 import QtCore, QtGui, Qsci
import sys, re, os, logging

log=logging.getLogger(__name__)

class TestDialog(QtGui.QDialog):
    def __init__(self):
        QtGui.QDialog.__init__(self)
        self.resize(800, 600)
        layout=QtGui.QGridLayout(self)
        
        le=QtGui.QLineEdit(self)
        layout.addWidget(le, 0, 0, 1, 2)
        
        tw=QtGui.QTreeWidget(self)
        delkey_tw = QtGui.QShortcut(QtGui.QKeySequence("Delete"), tw, context=QtCore.Qt.WidgetShortcut) #1
        delkey_tw.activated.connect(self.delkey_tw) #1
        layout.addWidget(tw, 1, 0)
        
        sc=Qsci.QsciScintilla(self)
        delkey_sc = QtGui.QShortcut(QtGui.QKeySequence("Delete"), sc, context=QtCore.Qt.WidgetShortcut) #2
        delkey_sc.activated.connect(self.delkey_sc) #2
        layout.addWidget(sc, 1, 1)

    def delkey_tw(self):
        log.debug("delkey_tw")
        
    def delkey_sc(self):
        log.debug("delkey_sc")

app=QtGui.QApplication(sys.argv)
sys.exit(TestDialog().exec_())

    def keyReleaseEvent(self, event):
        if event.key()==QtCore.Qt.Key_Delete:
            self.testmethod()