[Qt-interest] QWidget::setCursor() and qApp->processEvents()

[Atlant Schmidt]

Josh:

  Does some_widget_or_other->repaint() work for you?

                     Atlant

-----Original Message-----
From: qt-interest-bounces at trolltech.com [mailto:qt-interest-bounces at trolltech.com] On Behalf Of Josh
Sent: Wednesday, July 28, 2010 23:45 PM
To: qt-interest at trolltech.com
Subject: [Qt-interest] QWidget::setCursor() and qApp->processEvents()

Hello all,

Before I do some calculations in my program I want to set the cursor
using: viewport()->setCursor(Qt::WaitCursor);

However, the cursor doesn't change because of the calculations. I don't
want to call qApp->processEvents() during the calculations because I
actually want the ui *not* to respond while the calculations are taking
place. So I was able to get the cursor to update BEFORE the calculations
as follows:

qApp->processEvents();
qApp->processEvents();
viewport()->setCursor(Qt::WaitCursor);
for(int i=0; i<20; i++)
   qApp->processEvents();
do my calculations...

This is obviously a hack. I needed to call processEvents 20 times for the
cursor to update. Any less and the cursor wouldn't update before my
calculations. I would assume that on different machines I might need
different number of calls to processEvents(), which is undesirable. Anyone
have any ideas on the correct way to do this?

So in summary:
How can I make sure the cursor is changed before doing my calculations
when I don't want to call processEvents() during my calculations?

Thanks!

Josh
_______________________________________________
Qt-interest mailing list
Qt-interest at trolltech.com
http://lists.trolltech.com/mailman/listinfo/qt-interest

This e-mail and the information, including any attachments, it contains are intended to be a confidential communication only to the person or entity to whom it is addressed and may contain information that is privileged. If the reader of this message is not the intended recipient, you are hereby notified that any dissemination, distribution or copying of this communication is strictly prohibited. If you have received this communication in error, please immediately notify the sender and destroy the original message.

Thank you.

Please consider the environment before printing this email.