Arguments: grid-column
Returns the function that writes a grid cell value that has been entered by the user back into the data-object that is being represented on that cell's grid-row. The data-writer function is a property of a grid-column, and is called whenever the user enters a value into a cell of that column. The function should take two arguments, which are (1) the value that has been entered by the user and optionally converted by the grid-column's data-write-converter function, and (2) the grid-row's data-object. The function is typically simply the writer function of the data-object for the attribute represented by this grid-column.
For example, in the employee grid example, each row represents an employee, and the Department column represents the department attribute of each employee. The data-writer function of the Department column is (setf department), which is simply the writer method for the department slot of an employee instance. If the user enters "Sleeping" in a cell of the Department column, then the Department column's data-writer function, (setf employee-department), is called on the data-object (an employee) of the grid-row that the modified cell is in.
NOTE: Your application does not call the data-writer function; it supplies the data-writer function which is then called automatically by the system as needed.
data-writer is a property of the grid-column and row-header-column classes.
Common Graphics and IDE documentation is described in About Common Graphics and IDE documentation in cgide.htm.
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Copyright (c) 1998-2000, Franz Inc. Berkeley, CA., USA. All rights reserved.
Created 2000.10.5.