This post is to rephrase my question posted here in a different way. I want to make QlineEdit detect Tab Key press to call a method called do_something(). I generated the following pyqt5 code from Qt Designer which includes QlineEdit instance called lineEdit. When I enter SSN number and press tab key, the method should be called. How can I do that?
from PyQt5.QtWidgets import QApplication
from PyQt5 import QtCore, QtGui, QtWidgets
import sys
class Ui_Dialog(object):
def setupUi(self, Dialog):
Dialog.setObjectName("Dialog")
Dialog.resize(348, 68)
self.label = QtWidgets.QLabel(Dialog)
self.label.setGeometry(QtCore.QRect(40, 20, 41, 16))
self.label.setObjectName("label")
self.lineEdit = QtWidgets.QLineEdit(Dialog)
self.lineEdit.setGeometry(QtCore.QRect(80, 20, 201, 21))
self.lineEdit.setObjectName("lineEdit")
self.retranslateUi(Dialog)
QtCore.QMetaObject.connectSlotsByName(Dialog)
def do_something():
print('Success!')
def retranslateUi(self, Dialog):
_translate = QtCore.QCoreApplication.translate
Dialog.setWindowTitle(_translate("Dialog", "Dialog"))
self.label.setText(_translate("Dialog", "SSN"))
The simplest option as indicated in my previous answer is to use QShorcut, you must pass as a widget to the QLineEdit and a context that in this case must be Qt::WidgetWithChildrenShortcut
from PyQt5 import QtCore, QtGui, QtWidgets
class Ui_Dialog(object):
def setupUi(self, Dialog):
Dialog.setObjectName("Dialog")
Dialog.resize(348, 68)
self.label = QtWidgets.QLabel(Dialog)
self.label.setGeometry(QtCore.QRect(40, 20, 41, 16))
self.label.setObjectName("label")
self.lineEdit = QtWidgets.QLineEdit(Dialog)
self.lineEdit.setGeometry(QtCore.QRect(80, 20, 201, 21))
self.retranslateUi(Dialog)
QtCore.QMetaObject.connectSlotsByName(Dialog)
def retranslateUi(self, Dialog):
_translate = QtCore.QCoreApplication.translate
Dialog.setWindowTitle(_translate("Dialog", "Dialog"))
self.label.setText(_translate("Dialog", "SSN"))
class Dialog(QtWidgets.QDialog, Ui_Dialog):
def __init__(self, parent=None):
super(Dialog, self).__init__(parent)
self.setupUi(self)
shortcut = QtWidgets.QShortcut(
QtGui.QKeySequence(QtCore.Qt.Key_Tab),
self.lineEdit,
context= QtCore.Qt.WidgetWithChildrenShortcut,
activated=self.do_something)
@QtCore.pyqtSlot()
def do_something(self):
print('Success!')
if __name__ == '__main__':
import sys
app = QtWidgets.QApplication(sys.argv)
w = Dialog()
w.show()
sys.exit(app.exec_())
Much more simply, I had success with subclassing QLineEdit and over-riding its event method, as follows:
class EditSpec(QLineEdit):
def event(self,event):
if event.type() == QEvent.KeyPress and event.key() == Qt.Key_Tab:
self.tabFollow()
return True
else:
return QLineEdit.event(self,event)
def tabFollow(self):
print("tab-key pressed!")
Any non-tab key press proceeds normally, while tab-key presses result in the tabFollow method firing. To add (and this is important), over-riding the keyPressEvent method does not prevent the event from being fired through the event-system of the application. Only overriding the event method in a manner similar to the above did that.
