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driver(3FORM) driver(3FORM)
NAME
driver - command-processing loop of the form system
SYNOPSIS
#include <form.h>
int form_driver(FORM *form, int c);
DESCRIPTION
Once a form has been posted (displayed), you should funnel input events to it through
form_driver. This routine has three major input cases:
- The input is a form navigation request. Navigation request codes are constants defined
in <form.h>, which are distinct from the key- and character codes returned by wgetch.
- The input is a printable character. Printable characters (which must be positive, less
than 256) are checked according to the program's locale settings.
- The input is the KEY_MOUSE special key associated with an mouse event.
The form driver requests are as follows:
REQ_NEXT_PAGE
Move to the next page.
REQ_PREV_PAGE
Move to the previous page.
REQ_FIRST_PAGE
Move to the first page.
REQ_LAST_PAGE
Move to the last field.
REQ_NEXT_FIELD
Move to the next field.
REQ_PREV_FIELD
Move to the previous field.
REQ_FIRST_FIELD
Move to the first field.
REQ_LAST_FIELD
Move to the last field.
REQ_SNEXT_FIELD
Move to the sorted next field.
REQ_SPREV_FIELD
Move to the sorted previous field.
REQ_SFIRST_FIELD
Move to the sorted first field.
REQ_SLAST_FIELD
Move to the sorted last field.
REQ_LEFT_FIELD
Move left to a field.
REQ_RIGHT_FIELD
Move right to a field.
REQ_UP_FIELD
Move up to a field.
REQ_DOWN_FIELD
Move down to a field.
REQ_NEXT_CHAR
Move to the next char.
REQ_PREV_CHAR
Move to the previous char.
REQ_NEXT_LINE
Move to the next line.
REQ_PREV_LINE
Move to the previous line.
REQ_NEXT_WORD
Move to the next word.
REQ_PREV_WORD
Move to the previous word.
REQ_BEG_FIELD
Move to the beginning of the field.
REQ_END_FIELD
Move to the end of the field.
REQ_BEG_LINE
Move to the beginning of the line.
REQ_END_LINE
Move to the end of the line.
REQ_LEFT_CHAR
Move left in the field.
REQ_RIGHT_CHAR
Move right in the field.
REQ_UP_CHAR
Move up in the field.
REQ_DOWN_CHAR
Move down in the field.
REQ_NEW_LINE
Insert or overlay a new line.
REQ_INS_CHAR
Insert a blank at the cursor.
REQ_INS_LINE
Insert a blank line at the cursor.
REQ_DEL_CHAR
Delete character at the cursor.
REQ_DEL_PREV
Delete character before the cursor.
REQ_DEL_LINE
Delete line at the cursor.
REQ_DEL_WORD
Delete blank-delimited word at the cursor.
REQ_CLR_EOL
Clear to end of line from cursor.
REQ_CLR_EOF
Clear to end of field from cursor.
REQ_CLR_FIELD
Clear the entire field.
REQ_OVL_MODE
Enter overlay mode.
REQ_INS_MODE
Enter insert mode.
REQ_SCR_FLINE
Scroll the field forward a line.
REQ_SCR_BLINE
Scroll the field backward a line.
REQ_SCR_FPAGE
Scroll the field forward a page.
REQ_SCR_BPAGE
Scroll the field backward a page.
REQ_SCR_FHPAGE
Scroll the field forward half a page.
REQ_SCR_BHPAGE
Scroll the field backward half a page.
REQ_SCR_FCHAR
Scroll the field forward a character.
REQ_SCR_BCHAR
Scroll the field backward a character.
REQ_SCR_HFLINE
Horizontal scroll the field forward a line.
REQ_SCR_HBLINE
Horizontal scroll the field backward a line.
REQ_SCR_HFHALF
Horizontal scroll the field forward half a line.
REQ_SCR_HBHALF
Horizontal scroll the field backward half a line.
REQ_VALIDATION
Validate field.
REQ_NEXT_CHOICE
Display next field choice.
REQ_PREV_CHOICE
Display previous field choice.
If the second argument is a printable character, the driver places it in the current posi-
tion in the current field. If it is one of the forms requests listed above, that request
is executed.
MOUSE HANDLING
If the second argument is the KEY_MOUSE special key, the associated mouse event is trans-
lated into one of the above pre-defined requests. Currently only clicks in the user win-
dow (e.g. inside the form display area or the decoration window) are handled.
If you click above the display region of the form:
a REQ_PREV_FIELD is generated for a single click,
a REQ_PREV_PAGE is generated for a double-click and
a REQ_FIRST_FIELD is generated for a triple-click.
If you click below the display region of the form:
a REQ_NEXT_FIELD is generated for a single click,
a REQ_NEXT_PAGE is generated for a double-click and
a REQ_LAST_FIELD is generated for a triple-click.
If you click at an field inside the display area of the form:
- the form cursor is positioned to that field.
- If you double-click a field, the form cursor is positioned to that field and
E_UNKNOWN_COMMAND is returned. This return value makes sense, because a double
click usually means that an field-specific action should be returned. It is
exactly the purpose of this return value to signal that an application specific
command should be executed.
- If a translation into a request was done, form_driver returns the result of this
request.
If you clicked outside the user window or the mouse event could not be translated into a
form request an E_REQUEST_DENIED is returned.
APPLICATION-DEFINED COMMANDS
If the second argument is neither printable nor one of the above pre-defined form
requests, the driver assumes it is an application-specific command and returns
E_UNKNOWN_COMMAND. Application-defined commands should be defined relative to MAX_COM-
MAND, the maximum value of these pre-defined requests.
RETURN VALUE
form_driver returns one of the following error codes:
E_OK The routine succeeded.
E_BAD_ARGUMENT
Routine detected an incorrect or out-of-range argument.
E_BAD_STATE
Routine was called from an initialization or termination function.
E_NOT_POSTED
The form has not been posted.
E_INVALID_FIELD
Contents of field is invalid.
E_REQUEST_DENIED
The form driver could not process the request.
E_SYSTEM_ERROR
System error occurred (see errno).
E_UNKNOWN_COMMAND
The form driver code saw an unknown request code.
SEE ALSO
ncurses(3NCURSES), form(3FORM), wgetch(3X).
NOTES
The header file <form.h> automatically includes the header files <curses.h>.
PORTABILITY
These routines emulate the System V forms library. They were not supported on Version 7
or BSD versions.
AUTHORS
Juergen Pfeifer. Manual pages and adaptation for new curses by Eric S. Raymond.
driver(3FORM)
Generated by $Id: phpMan.php,v 4.49 2006/02/26 13:18:18 chedong Exp $ Author: Che Dong
On Apache
Under GNU General Public License
2012-05-25 21:54 @38.107.179.236 Crawled by CCBot/1.0 (+http://www.commoncrawl.org/bot.html)