DISPLAY ARRAY programming steps

Follow this procedure to use the DISPLAY ARRAY dialog instruction.

To implement a DISPLAY ARRAY statement:

  1. Create a form specification file containing a screen array. The screen array identifies the presentation elements to be used by the runtime system to display the rows.
  2. Make sure that the program controls interruption handling with DEFER INTERRUPT, to manage the validation/cancellation of the interactive dialog.
  3. Define an array of records with the DEFINE instruction. The members of the program array must correspond to the elements of the screen array, by number and data types. Static or a dynamic arrays can be used for the full list mode, but the paged mode requires a dynamic array. For new developments, use dynamic arrays in both cases.
  4. Open and display the form, using OPEN WINDOW WITH FORM or the OPEN FORM / DISPLAY FORM instructions.
  5. If you want to use the full list mode, fill the program array with data, typically with a result set cursor, counting the number of program records being filled with retrieved data.
  6. Set the int_flag variable to FALSE.
  7. Implement the DISPLAY ARRAY dialog block. When using a static array, specify the number of rows with the COUNT attribute in the ATTRIBUTES clause, or call the SET_COUNT() function before the dialog block. With dynamic arrays, the number of rows is automatically known by the dialog. Consider using the UNBUFFERED mode in new developments.
  8. If you want to use the paged mode, define the total number of rows with the COUNT attribute (can be -1 for infinite number of rows), and add the ON FILL BUFFER clause that will contain the code to fill the dynamic array with the expected rows from fgl_dialog_getBufferStart() to fgl_dialog_getBufferLength().
  9. If multi-row selection is needed, call the ui.Dialog.setSelectionMode() method in BEFORE DISPLAY to enable this mode.
  10. Inside the DISPLAY ARRAY block, control the behavior of the instruction with BEFORE ROW, AFTER ROW and ON ACTION blocks.
  11. After the interaction statement block, test the INT_FLAG predefined variable to check if the dialog was canceled (INT_FLAG=TRUE) or validated (INT_FLAG=FALSE). If the INT_FLAG variable is TRUE, reset it to FALSE in order not to disturb code that relies on this variable to detect interruption events from the GUI front-end or TUI console.
  12. If needed, get the current row with the ARR_CURR() built-in function after dialog execution. During dialog execution, you can also use DIALOG.getCurrentRow().