设置WEB ALV 每个cell的读写属性

Same as setting web alv color, the system also need the " read/edit"  property. the result like this picture

the cell(4,4) and cell(5,5) is read only and others are editable.
there are also two ways to do this.

1. set the read/edit property directly.

        when you do the columns loop, you can set the property .but it's difficult to set each cell's property,so I advice the next method.

    2. set the read/edit property column name.

        build the read/editp property column for each column
        ---------------------code---------------------------------
        CONCATENATE 'READONLY' LNAME INTO is_fieldcat-fieldname.
        APPEND is_fieldcat TO gt_fieldcatalog.
        " you may need to do the loop.
       -----------------------------------------------------------
       in web alv, we aften use inputfield to fill the cell and let end user to edit.
       so we use the method of the inputfield to do this matter.
       LR_INPUT_FIELD->set_read_only_fieldname( value = RO_FIELDNAME ).
       when you process the data ,you can fill the value of this read/edit property cell. ABAP_TRUE OR ABAP_FALSE.
       after binding this special data table to the web alv,which  contains the read/edit property column ,
       you will see the result like picture above.