form_driver 3x
form_driver(3x) form_driver(3x)
NAME
form_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:
o 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.
o The input is a printable character. Printable charac-
ters (which must be positive, less than 256) are
checked according to the program's locale settings.
o 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 position 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 translated into one of the above
pre-defined requests. Currently only clicks in the user
window (e.g., inside the form display area or the decora-
tion 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:
o the form cursor is positioned to that field.
o 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 pur-
pose of this return value to signal that an appli-
cation specific command should be executed.
o 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_COM-
MAND. Application-defined commands should be defined rel-
ative to MAX_COMMAND, 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 argu-
ment.
E_BAD_STATE
Routine was called from an initialization or termina-
tion 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
curses(3x), form(3x), form_variables(3x), getch(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.
form_driver(3x)
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