[Qt-interest] Widget for real-time syntax error feedback ?

[Stephen Collyer]

I have a QLineEdit object in a modal dialog. In a slot connected to its
textChanged() signal, I want to provide real-time feedback of syntax errors
or of the entry of data that is illegal for that field.

I've tried using QDialog::setToolTip(), but this doesn't work well. (The
tool
tip isn't displayed immediately;l focus must leave and come back to the
widget
AFAICS). I've also tried using a QLabel, but I can't seem to make this
visible
at all (using QLabel::show() - something related to modality ?) .

So can anyone suggest an implementation of a widget:

a) that can be displayed from a slot of a modal dialog
b) whose the duration of display can be controlled easily (e.g. autohide
after X ms)
c) is visually suitable for displaying short-term textual feedback to a user
d) requires no interaction from the user (i.e. it's not like a
QErrorMessage)

I guess I'm looking for something similar to the QStatusBar::showMessage()
functionality, but in a standalone widget.

-- 
Stephen Collyer
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