LISTBOX EXPAND

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4D v16.3

LISTBOX EXPAND


LISTBOX EXPAND ( {* ;} object {; recursive {; selector {; line {; column}}}} )

Parameter	Type	Description
*	Operator	If specified, object is an object name (string) If omitted, object is a variable
object	Form object	Object name (if * is specified) or Variable (if * is omitted)
recursive	Boolean	True = expand sublevels False = do not expand sublevels
selector	Longint	Part of list box to expand
line	Longint	Number of break row to expand or Number of list box level to expand
column	Longint	Number of break column to expand

Description

The LISTBOX EXPAND command is used to expand the break rows of the list box object designated by the object and * parameters.

If you pass the optional * parameter, you indicate that the object parameter is an object name (string). If you do not pass this parameter, you indicate that the object parameter is a variable. In this case, you pass a variable reference instead of a string.

If the list box is not configured in hierarchical mode, the command does nothing. For more information about hierarchical list boxes, please refer to the Managing Hierarchical List Boxes section.

The optional recursive parameter is used to configure the expanding of the hierarchical sublevels of the list box. Pass True or omit this parameter for the command to expand all the levels and all the sublevels. If you pass False, only the first level specified will be expanded.

The optional selector parameter is used to specify the scope of the command. You can pass one of the following constants, found in the List Box theme, in this parameter:

Constant	Type	Value	Comment
lk all	Longint	0	The command affects all sub-levels (default value, used when parameter is omitted).
lk selection	Longint	1	The command affects selected sub-levels.
lk break row	Longint	2	The command affects the sub-level to which the "cell" designated by the row and column parameters belongs. Note that these parameters represent the row and column numbers in the list box in standard mode and not in its hierarchical representation. If the row and column parameters are omitted, the command does nothing.
lk level	Longint	3	The command affects all the break rows corresponding to the level column. This parameter designates a column number in the list box in standard mode and not in its hierarchical representation. If the level parameter is omitted, the command does nothing.

The command does not select break rows.

If the selection or list box does not contain a break row or if all the break rows are already expanded, the command does nothing.

Example

This example illustrates different ways of using the command. Given the following arrays shown in a list box:

  //Expand all the break rows and subrows of the list box

 LISTBOX EXPAND(*;"MyListbox")

  //Expand the first level of break rows of the selection

 LISTBOX EXPAND(*;"MyListbox";False;lk selection)

  //If the "Belgium" row was selected

  //Expand the Brittany break row with recursion

 LISTBOX EXPAND(*;"MyListbox";False;lk break row;1;2)

  //Expand all the first columns (countries) without recursion

 LISTBOX EXPAND(*;"MyListbox";False;lk level;1)