Volume 6A: Motif Programming Manual

RowColumn widget. In such cases, you may want to use XmNisHomogeneous and XmNentryClass. Unless

there is some way for a user to to dynamically create widgets while an application is running, these resources are not

particularly useful.

9.5.3 Callbacks

The RowColumn does not provide any specific callback routines that react to user input. While there are no callbacks

for FocusIn and FocusOut events, the widget does have XmNmapCallback and XmNunmapCallback

callback resources. These callbacks are invoked when the window for the RowColumn is mapped and unmapped. The

callbacks are similar to those for the BulletinBoard, but since the RowColumn is not designed specifically to be a

child of a DialogShell, the routines are invoked regardless of whether the parent of the RowColumn is a DialogShell.

The XmNentryCallback is the only other callback that is associated specifically with the RowColumn widget.

This callback resource makes it possible to install a single callback function that acts as the activation callback for

each of the children of a RowColumn widget. The routine specified for the XmNentryCallback overrides the

XmNactivateCallback functions for any PushButton or CascadeButton children and the

XmNvalueChangedCallback functions for ToggleButtons. The XmNentryCallback is a convenience to the

programmer; if you use it, you don't have to install separate callbacks for each widget in the RowColumn.

XmNentryCallback functions must be installed before children are added to the RowColumn, so be ...