protected override void OnSizeRequested(ref Gtk.Requisition requisition)
{
// GUI designer automatically puts this widget into Viewport when property "Show Scrollbars" is set
// necessary for automatic scroll support.
// Need additional access in here to improve positioning when zooming.
// cannot be initialized in constructor
if (viewport == null)
{
viewport = (Gtk.Viewport) this.Parent;
viewport.AddEvents((int)Gdk.EventMask.ScrollMask);
// not called when scrollbar is being moved
//viewport.ScrollAdjustmentsSet += Viewport_ScrollAdjustmentsSet;
viewport.ScrollEvent += Viewport_ScrollEvent;
;
}
//var vr = viewport.Allocation;
//Console.WriteLine ("Viewport size request Width={0} Height={1}", vr.Width, vr.Height);
// Calculate desired size here.
requisition.Width = minWidth;
requisition.Height = minHeight;
//Console.WriteLine ("OnSizeRequested -> Requisition: {0}x{1}", requisition.Width, requisition.Height);
}