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Asked: 2026-05-10T19:53:15+00:00

I want to display an image within a scroll area. The view port of

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I want to display an image within a scroll area. The view port of the scroll area shall have a defined initial size. That means, if the image’s size is bigger than the initial size of the view port, scroll bars will be visible, otherwise not.

// create label for displaying an image QImage image( ":/test.png" ); QLabel *label = new QLabel( this ); label->setPixmap( image.toPixmap() );  // put label into scroll area QScollArea *area = new QScrollArea( this ); area->setWidget( label );  // set the initial size of the view port // NOTE: This is what I'd like to do, but this method does not exist area->setViewPortSize( QSize( 300, 300 ) );

It shall be possible to resize the whole application so that the view port will get another size than the initial one.

Unfortunately, I was not able to find out, how to set the size of the view port. Qt’s layout mechanism seems to set a default size for the view port, but up to now I was not able to change it.

Setting a new size with area->setMinimumSize( QSize( 300, 300 ) ); will actually set the demanded size, but then the scroll area looses the ability to get resized to a size smaller than 300×300.

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1 Answer

  1. I think that you are looking at the problem the wrong way. The QScrollArea is just a widget that you put in a frame or QMainWindow. The size of the widget is controlled by the layout of the widget that contains it.

    Take a look at this example from Trolltech: Image Viewer Example

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