3091-2.cs

protected override Size ArrangeOverride(Size finalSize)
{
	var posY = 0d;

	var currentRow = new List<UIElement>();
	var rowHeight = 0d;

	foreach (var child in Children)
	{
		if (currentRow.Sum(x => x.DesiredSize.Width) + child.DesiredSize.Width <= finalSize.Width)
		{
			currentRow.Add(child);
			rowHeight = Math.Max(child.DesiredSize.Height, rowHeight);
		}
		else
		{
			var rowChildCount = currentRow.Count;
			var columnWidth = finalSize.Width / rowChildCount;
			for (int i = 0; i < rowChildCount; i++)
			{
				currentRow[i].Arrange(new Rect(columnWidth * i, posY, columnWidth, currentRow[i].DesiredSize.Height));
			}

			posY += rowHeight;
			rowHeight = child.DesiredSize.Height;
			currentRow = new List<UIElement>();
			currentRow.Add(child);
		}
	}

	if (currentRow.Count > 0)
	{
		var rowChildCount = currentRow.Count;
		var columnWidth = finalSize.Width / Math.Max(rowChildCount, MinimumColumnsOnLastRow);
		for (int i = 0; i < rowChildCount; i++)
		{
			currentRow[i].Arrange(new Rect(columnWidth * i, posY, columnWidth, currentRow[i].DesiredSize.Height));
		}
	}

	return finalSize;
}