def keyPressEvent(self, event):
        """Keyboard shortcuts"""
        key = event.key()
        if key == QtCore.Qt.Key_X:
            self.actionXref()
        elif key == QtCore.Qt.Key_G:
            self.actionGoto()
        elif key == QtCore.Qt.Key_X:
            self.actionXref()
        elif key == QtCore.Qt.Key_I:
            self.actionInfo()
        elif key == QtCore.Qt.Key_R:
            self.reload_java_sources()