private void MeasureGroupElement(BaseListViewGroupVisualItem groupElement)
{
ListViewDataItemGroup data = groupElement.Data as ListViewDataItemGroup;
if (groupElement.HasVisibleItems())
{
int itemSpacing = this.owner.ItemSpacing;
float num1 = 0.0f;
float width = 0.0f;
float val1 = 0.0f;
int num2 = 1;
foreach (ListViewDataItem listViewDataItem in data.Items)
{
float num3 = num1 + (float)listViewDataItem.ActualSize.Height;
if (num2 > 1)
{
num3 += (float)itemSpacing;
}
if ((double)num3 > (double)this.clientRect.Height)
{
num1 = 0.0f;
num2 = 1;
width += val1;
if (this.owner.Orientation == Orientation.Horizontal)
{
width += (float)itemSpacing;
}
val1 = 0.0f;
}
num1 += (float)listViewDataItem.ActualSize.Height;
if (num2 > 1)
{
num1 += (float)itemSpacing;
}
val1 = Math.Max(val1, (float)listViewDataItem.ActualSize.Width);
++num2;
}
if ((double)val1 > 0.0)
{
width += val1;
}
int num4 = !this.owner.Owner.AllowArbitraryItemHeight || data.Size.Height <= 0 ? this.owner.GroupItemSize.Height : data.Size.Height;
groupElement.Measure(new SizeF(width, (float)num4));
}
else
{
groupElement.Measure(this.clientRect.Size);
this.currentX += groupElement.DesiredSize.Width;
this.currentY = this.clientRect.Top;
}
}