public virtual sw.Size MeasureOverride(sw.Size constraint, Func <sw.Size, sw.Size> measure)
{
// enforce eto-style sizing to wpf controls
var size = UserPreferredSize;
var control = ContainerControl;
// Constrain content to the preferred size of this control, if specified.
var desired = measure(constraint.IfInfinity(size.InfinityIfNan()));
// Desired size should not be smaller than default (minimum) size.
// ensures buttons, text box, etc have a minimum size
var defaultSize = DefaultSize.ZeroIfNan();
desired = desired.Max(defaultSize);
// Desired should also not be bigger than default size if we have no constraint.
// Without it, controls like TextArea, GridView, etc will grow to their content.
if (double.IsInfinity(constraint.Width) && defaultSize.Width > 0)
{
desired.Width = PreventUserResize ? defaultSize.Width : Math.Max(defaultSize.Width, desired.Width);
}
if (double.IsInfinity(constraint.Height) && defaultSize.Height > 0)
{
desired.Height = PreventUserResize ? defaultSize.Height : Math.Max(defaultSize.Height, desired.Height);
}
// use the user preferred size, and ensure it's not larger than available size
size = size.IfNaN(desired);
size = size.Min(constraint);
// restrict to the min/max sizes
size = size.Max(control.GetMinSize());
size = size.Min(control.GetMaxSize());
return(size);
}
protected override sw.Size MeasureOverride(sw.Size availableSize)
{
if (IsLoaded)
{
availableSize = availableSize.IfInfinity(Handler.UserPreferredSize.IfNaN(Handler.DefaultSize));
}
return(Handler?.MeasureOverride(availableSize, base.MeasureOverride) ?? base.MeasureOverride(availableSize));
}