pyqt keypress event in lineedit - python-3.x

Question

i have created a untitled ui where exists one lineedit.
now i want to get the value of whatever i type in lineedit immediately
i figured out it could be done using keypressevent but i exactly didn't understand how to use it in lineedit now
from untitled import *
from PyQt4 import QtGui # Import the PyQt4 module we'll need
import sys # We need sys so that we can pass argv to QApplication
import os
from PyQt4.QtGui import *
from PyQt4.QtCore import *
class MainWindow(QMainWindow, Ui_Dialog):
def event(self, event):
if type(event) == QtGui.QKeyEvent:
print (event.key())
def __init__(self, parent=None):
QMainWindow.__init__(self, parent)
self.setupUi(self)
#here i want to get what is keypressed in my lineEdit
if __name__ == '__main__':
app = QApplication(sys.argv)
w = MainWindow()
w.show()
sys.exit(app.exec_())
this is my untitled.py code that i have imported
# -*- coding: utf-8 -*-
# Form implementation generated from reading ui file 'untitled.ui'
#
# Created by: PyQt4 UI code generator 4.11.4
#
# WARNING! All changes made in this file will be lost!
from PyQt4 import QtCore, QtGui
try:
_fromUtf8 = QtCore.QString.fromUtf8
except AttributeError:
def _fromUtf8(s):
return s
try:
_encoding = QtGui.QApplication.UnicodeUTF8
def _translate(context, text, disambig):
return QtGui.QApplication.translate(context, text, disambig, _encoding)
except AttributeError:
def _translate(context, text, disambig):
return QtGui.QApplication.translate(context, text, disambig)
class Ui_Dialog(object):
def setupUi(self, Dialog):
Dialog.setObjectName(_fromUtf8("Dialog"))
Dialog.resize(662, 207)
self.lineEdit = QtGui.QLineEdit(Dialog)
self.lineEdit.setGeometry(QtCore.QRect(50, 30, 113, 27))
self.lineEdit.setObjectName(_fromUtf8("lineEdit"))
self.retranslateUi(Dialog)
QtCore.QMetaObject.connectSlotsByName(Dialog)
def retranslateUi(self, Dialog):
Dialog.setWindowTitle(_translate("Dialog", "Dialog", None))
if __name__ == "__main__":
import sys
app = QtGui.QApplication(sys.argv)
Dialog = QtGui.QDialog()
ui = Ui_Dialog()
ui.setupUi(Dialog)
Dialog.show()
sys.exit(app.exec_())

Answer 1

If you want to get the whole text in the line-edit as it is entered, you can use the textEdited signal. However, if you just want to get the current key that was pressed, you can use an event-filter.
Here is how to use both of these approaches:
class MainWindow(QMainWindow, Ui_Dialog):
def __init__(self, parent=None):
super(MainWindow, self).__init__(parent)
self.setupUi(self)
self.lineEdit.installEventFilter(self)
self.lineEdit.textEdited.connect(self.showCurrentText)
def eventFilter(self, source, event):
if (event.type() == QEvent.KeyPress and
source is self.lineEdit):
print('key press:', (event.key(), event.text()))
return super(MainWindow, self).eventFilter(source, event)
def showCurrentText(self, text):
print('current-text:', text)