如果输入类型是当前节点类型的有效映射，则返回包含当前节点值的目标类型的实例。
If the input type is a valid mappings for the type of the current node then an instance of the target type containing the value of the current node is returned.
然后，判断每个矩形区域内的目标物边界是否包含手动选取的两个对角顶点，若不包含，则边界生长直至包含该对顶点；
At thes third step, for every rectangular, we check whether boundary include two apex which is selected at first step, if not included, then the boundary grow until that contains the apex.
如果目标区域包含的行比源多，则源文本将不会重复。
If the destination area contains more rows than the source, the source text will not repeat.
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