DEC Text Processing Utility Program Development

5.3Writing Code Compatible with DECwindows EVE

5.3Writing Code Compatible with DECwindows EVE

This section provides information useful for programmers who extend

DECwindows EVE or layer applications on DECwindows EVE.

5.3.1 Select Ranges in DECwindows EVE

This section is intended for programmers who are extending EVE or layering an application on EVE.

There are four possible types of selection:

•Dynamic selection

•Static selection

•Found range selection

•DECwindows primary or secondary global selection

EVE can use only one type of selection at a time. The ways in which these selections differ are explained in the following sections.

EVE has a routine called EVE$SELECTION that returns the current selection, regardless of whether the selection is dynamic, static, formed from a found range, or the primary global selection. You can use the SELECT_RANGE built-in procedure to get the current selection if the selection is a dynamic selection. However, Compaq recommends that you use EVE$SELECTION to get the current selection because this routine returns the current selection regardless of how it was created. To see how the EVE$SELECTION routine works and what parameters it takes, see the code for this routine in SYS$EXAMPLES:EVE$CORE.TPU.

5.3.1.1 Dynamic Selection

When you press the Select key or invoke the SELECT command, EVE creates a dynamic selection. A dynamic selection expands and contracts as you move the text cursor. Moving the text cursor away from the text already selected does not cancel the selection. If you use the mouse to start a selection while a dynamic selection is active, the dynamic selection is canceled.

If EVE’s current selection is a dynamic selection, the routine EVE$SELECTION returns the selected range and terminates the selection. If, for some reason, you want to use a statement that returns the current dynamic selection but does not terminate it, you can use a statement whose format is similar to the following:

r1 := EVE$SELECTION (TRUE, TRUE, TRUE, TRUE, FALSE)

The last parameter directs EVE$SELECTION not to terminate the selection. For more information on how to use these parameters, see the EVE$SELECTION routine in SYS$EXAMPLES:EVE$CORE.TPU.

5.3.1.2 Static Selection

EVE creates a static selection if you do any of the following:

•Click the MB1 mouse button two or more times to select a word, line, paragraph, or buffer

•Use the EVE command SELECT ALL

•Press the MB1 mouse button, drag the mouse across text, and then release the mouse button

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Compaq AA-PWCBD-TE manual Writing Code Compatible with DECwindows EVE, Select Ranges in DECwindows EVE, Dynamic Selection
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