For each cell, the background color is based on the currentcolumn number.
对于每个单元格，背景色基于当前的列号。
2
When the vertical space remaining in the currentcolumn is insufficient for the block of text, the text is printed in the next column.
在当前栏内所剩余的纵向空间放不下既定一段正文时，则这段正文从下一栏开始打印[或印刷]。
3
Add your configured and value-bound component to the currentcolumn, and end your column loop iteration by adding the completed column to the children of the DataTable.