Restrict resize of a Widget.

[sayan275]

I have Image viewer with some navigation controls.

So, in QGraphicsView there's a QGraphicsScene where I set the image by pixmap.
Based on the pixmaps width and height, I have restricted the min size of the QGraphicsView as well as the whole widget.
Now increasing the size of the main widget, it should allow to resize if the width : height ratio matches the image's aspect ratio and the image will scale.
Let's say my image is 640 : 480, so ratio is 1.3333. Now when I try to resize my ImageViewer, the QGraphicsViewer's new size should have the ratio of 1.333, else the ImageViewer shouldn't resize.
So, I have overriden resizeEvent(QResizeEvent *event) of the ImageViewer, but I couldn't restrict the resize only on valid conditions. This resizeEvent(QResizeEvent *event) gets called whenever I drag the corners.

Any suggestions are appreciated!!

Regards,
Sayan

[dheerendra]

You can try using the event filters and fix the size once it reaches certain limit.

[SGaist]

Hi,

If you want to have a specific aspect ratio, then you should rather handle the resizing in a container widget that would have the ImageViewer as member variable.

[sayan275]

@SGaist I tried your suggestion, but the resize event gets called after the widget has resized.

I tried the below, but it fails on start only,-> no widget is visible..it takes size 0,0..so

double ratio = "1.3";
double windowRatio = (double) width() / height();
if(ratio == s)
{
   QMdiSubWindow::resizeEvent(event);
}
else
{
   resize(event->oldSize());
}

[sayan275]

@dheerendra Sir can you explain a bit more in detail.
Are you asking to installEventFilters for resize event?

[SGaist]

The idea is that you have your container widget getting resized and in its resize event, you change the size of the inner widgets with the ratio you want.