QScrollArea and scroll

I apologize for my English, since this first message in English.

There's a certain analog of the playlist in a videowidget.

Code:

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scrollArea = new QScrollArea(); 
scrollAreaWidgetContents = new QWidget(); 
scrollArea->setWidget(scrollAreaWidgetContents);

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After that I add in layout of scrollAreaWidgetContents (QVBoxLayout) many widgets.
How to do so that QScrollArea it was scrolled to necessary to me widget?

While I do so:

Code:

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MyWidget *selectedWidget = findWidget(id); 
selectedWidget->mark(); 
_ui->scrollArea->ensureWidgetVisible(selectedWidget , 0, 0);

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After that necessary widget became selected (after mark()), but QScrollArea to it it was not scrolled.

In your situation you should get the child widget (the one you want to scroll to) position, and then use:
void QScrollArea::ensureVisible ( int x, int y, int xmargin = 50, int ymargin = 50 )