setValue of ScrollBar Don't work at first time

[Santosh Reddy]

It is not very clear in what sequence you are doing the things

scrollAreaCandidate->horizontalScrollBar()->setValue(2000);

scrollAreaCandidate->horizontalScrollBar()->setValue(2000);

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this should done some were after you load the pixmap into QLabel, and set the QLabel in the scroll area, and then set the scroll bar position

[sergio87]

That's just what I do, no?

I'll explain: The first eight lines of my code are in the constructor of the class. So, it only be executed once. I call al lot of times to "openImage". The first time I do it not work. And not work only the setValue of the scrollBar, because the resize (MyClass::scaleCandidateImage) works allways.

The following times it works properly.

¿Any ideas?

[Santosh Reddy]

Ok, try adding this

scrollAreaCandidate->horizontalScrollBar()->setValue(2000);
scrollAreaCandidate->update(); //Add this

scrollAreaCandidate->horizontalScrollBar()->setValue(2000);
scrollAreaCandidate->update(); //Add this

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[sergio87]

Thanks!!
I had already tested, and didn't works.

I tried:

scrollAreaCandidate->horizontalScrollBar()->update();
scrollAreaCandidate->update();
scrollAreaCandidate->horizontalScrollBar()->repaint();

scrollAreaCandidate->horizontalScrollBar()->update();
scrollAreaCandidate->update();
scrollAreaCandidate->horizontalScrollBar()->repaint();

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But nothing works!!!

[Santosh Reddy]

were in you code you call openImage(), I mean which objects method / slot?
If openImage() is a slot, to which signal is it connected?

[sergio87]

Thanks for reply!

The connexions are very sophisticated. MyClass emits a signal when is clicked a button. I connect this signal with another slot of other class (MainWindow). MainWindow do some operations and generates a string (path). I emit a signal with this string, and the receiver is MyClass:penImage.

At fisrt time, mainWindow emits the signal with a default path. Perhaps the error could be there. But I can't understand why the first time it scale the image properly and not set the value of the scrollBar!

[MarekR22]

try to use: QScrollArea::alignment-prop I think this is what you really want.

[sergio87]

try to use: QScrollArea::alignment-prop I think this is what you really want.

I read that this is to centre (for example) the content. http://lists.trolltech.com/qt4-previ...ad00063-0.html

Maybe my poor english is confusing. My apologies. Anyway, I tried and it didn't work.

I simplified the code to show you. The "2000", actually, is a variable that contains a different value called pointX. Point is calculated every time I load an image, before the setValue. It contain the correct number in each image, but it didn't set the value to the crolBar...

Thank you very much!!