Hey Manuel,
Have you tried using a QCompleter? You realize its provided to do this exact 
functionality?
http://www.riverbankcomputing.co.uk/static/Docs/PyQt4/html/qcompleter.html

There are a couple different modes it can be set to, one of which being a popup 
that narrows down the list as you type. 



On May 6, 2012, at 5:45 PM, Manuel Macha <[email protected]> wrote:

> Hi,
> 
> I'm trying to create a variation of QLineEdit where as soon as the user types 
> something, a list of items that match the entered text pop up below the 
> textfield. If you're not sure what I mean - it's supposed to work like the 
> searchbox in any modern browser where suggestions are being displayed while 
> typing.
> The problem that I'm having is that as soon as I'm displaying the menu, the 
> lineedit is loosing focus which makes it impossible to type more than a 
> character at a time - not exactly very user-friendly. I tried several things 
> using setFocusPolicy and setFocusReason but I'm not sure if I properly 
> understood how to utilize those functions.
> Could someone please have a look at the sample code below. Very much 
> appreciated!
> 
> http://pastebin.com/m318MY2G
> 
>    from PyQt4.QtGui import QLineEdit, QMenu, QAction
>    
>    class SearchField(QLineEdit):
>       def __init__(self, parent = None):
>               QLineEdit.__init__(self, parent = parent)          
>               self.textEdited.connect(self.popupMenu)
>               
>               
>       def popupMenu(self):
>               aMenu = QMenu()
>               aMenu.addAction('Some text')
>               aMenu.addAction('More text')
>               globalPos = self.mapToGlobal(self.pos())
>               globalPos.setY(globalPos.y() + self.height())
>               aMenu.exec_(globalPos)
>               self.setFocus()
>    
>    if __name__ == '__main__':
>       import sys
>       from PyQt4.QtGui import QApplication, QMainWindow
>       app = QApplication(sys.argv)
>       win = QMainWindow()
>       win.setGeometry(200, 200, 128,32)
>       win.setCentralWidget(SearchField())
>       win.show()
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