I am new to PyQt. I designed a form in QtDeveloper which have three controls. One push button, one combo box and one line edit. The name of the line edit widget in my ui form is myLineEdit. I want to know which Qwidget got focus (QLineEdit or QComboBox). I implement the code obtained from internet. When the code run, a separate line edit is created and it works fine. But I want to give the focusInEvent to myLineEdit widget created in the .ui form. My code is given. Please help.
class MyLineEdit(QtGui.QLineEdit):
def __init__(self, parent=None):
super(MyLineEdit, self).__init__(parent)
def focusInEvent(self, event):
print 'focus in event'
self.clear()
QLineEdit.focusInEvent(self, QFocusEvent(QEvent.FocusIn))
class MainWindow(QtGui.QMainWindow,Ui_MainWindow):
def __init__(self, parent = None):
super(MainWindow, self).__init__(parent)
self.setupUi(self)
self.myLineEdit = MyLineEdit(self)
You must implement the eventFilter
method and enable this property to the widgets that are needed with:
{your widget}.installEventFilter(self)
The eventFilter method has as information the object and type of event.
Example
import sys
from PyQt5 import uic
from PyQt5.QtCore import QEvent
from PyQt5.QtWidgets import QApplication, QWidget
uiFile = "widget.ui" # Enter file here.
Ui_Widget, _ = uic.loadUiType(uiFile)
class Widget(QWidget, Ui_Widget):
def __init__(self, parent=None):
super(Widget, self).__init__(parent=parent)
self.setupUi(self)
self.lineEdit.installEventFilter(self)
self.pushButton.installEventFilter(self)
self.comboBox.installEventFilter(self)
def eventFilter(self, obj, event):
if event.type() == QEvent.FocusIn:
if obj == self.lineEdit:
print("lineedit")
elif obj == self.pushButton:
print("pushbutton")
elif obj == self.comboBox:
print("combobox")
return super(Widget, self).eventFilter(obj, event)
if __name__ == '__main__':
app = QApplication(sys.argv)
w = Widget()
w.show()
sys.exit(app.exec_())
Ouput:
lineedit
pushbutton
combobox
pushbutton
lineedit