DEC Text Processing Utility Program Development

5.2 Programming in DECwindows DECTPU

•Menu_bar

•Popup_attached_db

•Popup_dialog_box

•Popup_menu

•Pulldown_entry

•Pulldown_menu

•Push_button

•Scroll_bar (vertical and horizontal)

•Separator

•Simple_text

•Toggle_button

5.2.2Input Focus Support

In DECwindows, at most one of the applications on the screen can have the input focus; that is, only one application can accept user input from the keyboard. For more information about the input focus, see the Motif documentation.

DECwindows DECTPU automatically grabs the input focus whenever you cause an unmodified M1DOWN event (that is, an event not modified by Shift, Ctrl, or other modifying key) while the pointer cursor is in either of the following locations:

•DECTPU’s main window widget

•DECTPU’s title bar

DECwindows assigns input focus to DECTPU only if and when it is possible to do so. To make sure that DECwindows can assign input focus, your application should use the GET_INFO (SCREEN, ‘‘input_focus’’) built-in procedure.

If assignment of input focus to DECTPU is enabled, DECTPU can receive input focus in the following circumstances:

•DECwindows DECTPU grabs input focus

•The DECwindows session manager assigns input focus to DECTPU

•An application layered on DECTPU requests input focus

In the Motif environment, DECTPU supports both implicit and explicit focus policies.

Compaq recommends that you use only a DECwindows section file with DECwindows DECTPU. (All versions of EVE shipped with OpenVMS Version

5.1or higher are compatible with DECwindows and are suitable for building DECwindows section files, as well as DECTPU Version 3.0 or higher.) However, if you do not follow this recommendation, DECTPU’s automatic grabbing of the input focus enables your layered application to interact with other DECwindows applications.

DEC Text Processing Utility Program Development 5–5

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Compaq AA-PWCBD-TE manual Input Focus Support
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