Volume 6A: Motif Programming Manual

XmMODIFICATION when the user modifies the selected list by using the SHIFT key in combination with a selection

action. In this case, the selected item list contains some items that were already selected before this action took place.

XmADDITION indicates that the items that are selected are in addition to what was previously selected. The user can

select additional items by using the CTRL key in combination with a selection action. Regardless of the value for

selection_type, the selected_items and selected_item_positions fields always reflect the set of

currently selected items.

13.6 Summary

The List widget is a powerful user interface tool that has a simple design. The programming interface to the widget is

mostly mechanical. The List allows you to present a vast list of choices to the user, although the choices themselves

must be textual in nature. Lists are not suitable for all situations however, as they cannot display choices other than

text (pixmaps cannot be used as selection items) and there is no ability to set color on individual items. Even with

these shortcomings, the List widget is still a visible and intuitive object that can be used in designing a graphical user

interface.

13.7 Exercises

The following exercises expand on some of the concepts presented in this chapter.

Write a program that reads each word from the file /usr/dict/words into a ScrolledList. Provide a TextField

widget whose callback routine searches for the word typed into it from the entries in the List. Once found, ...