DEC Text Processing Utility Program Development

5.2Programming in DECwindows DECTPU

5.2.3.4Response to Requests for Information About the Global Selection

DECTPU provides a three-level hierarchy for responding to requests from another application for information about the current selection. Applications layered on DECTPU may specify a routine that responds to requests for information about global selections either for the entire application or for one or more buffers in the application.

When DECTPU receives a request for information, it checks whether there is a routine for the current buffer that responds to information about global selections. If no buffer-specific routine is available, DECTPU checks for an application- wide routine. If no application-wide routine is available, DECTPU can provide information only about the primary selection, the file name, font, line number, and text.

DECTPU responds to all other requests with a message that no information is available. DECTPU does not send requests for information about the global selection to other DECwindows applications. DECTPU applications may use the various built-in procedures to do so.

DECTPU’s responses to requests for information about the primary selection are as follows:

"FILE_NAME"

DECTPU responds with the string returned by the GET_INFO

 

(CURRENT_BUFFER, "file_name") built-in procedure.

"FONT"

DECTPU responds with the string returned by the GET_INFO

 

(SYSTEM, "default_font") built-in procedure.

"LINE_NUMBER"

DECTPU responds with the value of type span containing the

 

record number where the select range starts and the record

 

number where the select range ends.

"TEXT" or "STRING"

DECTPU responds with the text of the select range as a string,

 

with each line break represented by a line feed.

Compaq recommends that you use only a DECwindows section file with DECwindows DECTPU. However, if you do not follow this recommendation, DECTPU’s automatic grabbing of the primary global selection enables your layered application to interact with other DECwindows applications.

If an application requests information about the primary global selection while DECTPU owns the selection, DECTPU attempts to respond to the request if the application cannot do so. If DECTPU responds to the request by sending the text of a buffer or range, DECTPU converts the buffer or range to a string, converts line breaks to line feeds, and inserts padding blanks before text to fill any unoccupied space between the margins. If neither the application nor DECTPU can respond to the request, DECTPU informs DECwindows that the requested information is not available.

DECTPU does not automatically grab the secondary selection. Layered applications are responsible for handling this selection.

5.2.4 Using Callbacks

This section presents background information on the DECwindows concept of callbacks and explains how DECwindows DECTPU implements this concept.

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Compaq AA-PWCBD-TE manual Using Callbacks, Filename
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