I have created a custom widget containing a DrawArea inside a
ScrolledWindow. I want to center the DrawArea inside the ScrolledWindow
when the widget is first shown. I have the following method to do this:
public void AdjustCardAreaScrollerToCentre()
{
Adjustment hAdj = cardScroller.Hadjustment;
hAdj.Value = (hAdj.Upper - hAdj.PageSize) / 2;
cardScroller.Hadjustment = hAdj;
Adjustment vAdj = cardScroller.Vadjustment;
vAdj.Value = (vAdj.Upper - vAdj.PageSize) / 2;
cardScroller.Vadjustment = vAdj;
}
If I call this from within the widget's OnExposeEvent, the DrawArea is
centered, but of course I can never adjust the scrollbars since every
movement calls OnExposeEvent which will reposition the DrawArea back to
the center.
I have tried calling the method from OnRealized and OnShown event
handlers, but the top left corner of the DrawArea is shown (as specified
by the ScrollWindow's WindowPlacement property).
Where do I call the centering method from to get the DrawArea to be
centered in the ScrolledWindow when the widget is first displayed?
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