[PyQt] QSpinBox does not recognize returnPressed event

[Hans-Peter Jansen]

On Wednesday 11 May 2011, 11:13:24 Adrian Casey wrote:
> I want to connect the returnPressed() event to a QSpinBox widget but
> it is not working.  I use the same approach with a QComboBox and it
> works. I'm using Qt 4.7.0 and PyQt on Kubuntu 10.10.
>
> Here is a simple form containing a combobox and a spinbox.  Only the
> combobox registers the returnPressed event.
>
> Can anyone tell me why the spinbox does not see the returnPressed
> event?

From a cursory look, I would call this a Qt bug. Obviously, they handle 
the keyEvent for the return key in some way (by selecting the text), 
but forget to emit the signal, nor call the QLineEdit base class event 
method.

A look into the Qt source would clarify things and often gives an idea 
for a work around. As a starter, you could install some kind of event 
filter on the lineEdit widget and emit the signal yourself.

Pete

> #!/usr/bin/python
>
> # simple.py
>
> import sys
> from PyQt4 import QtGui
> def do_it():
>      print 'Return pressed!'
>
> app = QtGui.QApplication(sys.argv)
>
> widget = QtGui.QWidget()
> widget.resize(250, 150)
> widget.setWindowTitle('Signal Test')
> layout = QtGui.QBoxLayout(2, widget)
> cb = QtGui.QComboBox(widget)
> cb.setEditable(True)
> sb = QtGui.QSpinBox(widget)
> layout.addWidget(sb)
> layout.addWidget(cb)
> cb.lineEdit().returnPressed.connect(do_it)
> sb.lineEdit().returnPressed.connect(do_it)
> widget.show()
>
> sys.exit(app.exec_())
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