Reimplement QPlainText’s focusInEvent in another source file ,how to ?

[redstoneleo]

The UI is as following

The UI is as following
http://img.my.csdn.net/uploads/201211/07/1352267120_2257.jpg

I saved the form as a file named re.ui
Then I convert it into Python script named ui_re.py
Third ,I create the source file with the name
callFirstApp.pyw and import the ui_re.py to it

The code in the callFirstApp.pyw is as shown here:
@

import sys
from PySide.QtGui import *
from ui_re import *

class MainWindow(QMainWindow, Ui_MainWindow):
def init(self, parent=None):
super(MainWindow, self).init(parent)
self.setupUi(self)
self.plainTextEdit.setPlainText("Type code here...")

if name == 'main':
app =QApplication(sys.argv)
frame = MainWindow()
frame.show()
app.exec_()
@
I want to reimplement the QPlainText’s focusInEvent in this file ,my code is as following
(means let the default text "Type code here..." disappear when focus in the QTextEdit’s editable area)

@
def focusInEvent(self, event):
self.clear()
QPlainTextEdit.focusInEvent(self, event)
@
But I don’t know how to add the code to the file correctly ?
Thanks in advance .

[jazzycamel]

I'm not an expert in the use of Designer but AFAIK, you can't. You can write a widget with the functionality you want and expose it to designer (Put a normal QTextEdit in you UI form and then use the promote to... option, I've only done this in C++).

IMHO, Designer and forms are only good for simple UI's where you don't want to modify standard behaviors, just connect to signals and slots and call methods on the created objects. I hardly ever use it preferring to layout all my UI's in pure python (or C++) as you have much finer control and better access to the objects you're creating. As I say, this is only my opinion. In your case, it will probably be simpler and quicker to do this.