***************************************************************************
Copyright (c) 1998-2008,2010 Free Software Foundation, Inc. *
*
Permission is hereby granted, free of charge, to any person obtaining a *
copy of this software and associated documentation files (the *
"Software"), to deal in the Software without restriction, including *
without limitation the rights to use, copy, modify, merge, publish, *
distribute, distribute with modifications, sublicense, and/or sell *
copies of the Software, and to permit persons to whom the Software is *
furnished to do so, subject to the following conditions: *
*
The above copyright notice and this permission notice shall be included *
in all copies or substantial portions of the Software. *
*
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
*
Except as contained in this notice, the name(s) of the above copyright *
holders shall not be used in advertising or otherwise to promote the *
sale, use or other dealings in this Software without prior written *
authorization. *
***************************************************************************

$Id: form_driver.3x,v 1.22 2010/12/04 18:38:55 tom Exp $
.. form_driver - command-processing loop of the form system #include <form.h>

int form_driver(FORM *form, int c);

Once a form has been posted (displayed), you should funnel input events to it through form_driver. This routine has three major input cases: .bP 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. .bP The input is a printable character. Printable characters (which must be positive, less than 256) are checked according to the program's locale settings. .bP The input is the KEY_MOUSE special key associated with an mouse event.

The form driver requests are as follows:

5 REQ_NEXT_PAGE Move to the next page.

5 REQ_PREV_PAGE Move to the previous page.

5 REQ_FIRST_PAGE Move to the first page.

5 REQ_LAST_PAGE Move to the last field.

5 REQ_NEXT_FIELD Move to the next field.

5 REQ_PREV_FIELD Move to the previous field.

5 REQ_FIRST_FIELD Move to the first field.

5 REQ_LAST_FIELD Move to the last field.

5 REQ_SNEXT_FIELD Move to the sorted next field.

5 REQ_SPREV_FIELD Move to the sorted previous field.

5 REQ_SFIRST_FIELD Move to the sorted first field.

5 REQ_SLAST_FIELD Move to the sorted last field.

5 REQ_LEFT_FIELD Move left to a field.

5 REQ_RIGHT_FIELD Move right to a field.

5 REQ_UP_FIELD Move up to a field.

5 REQ_DOWN_FIELD Move down to a field.

5 REQ_NEXT_CHAR Move to the next char.

5 REQ_PREV_CHAR Move to the previous char.

5 REQ_NEXT_LINE Move to the next line.

5 REQ_PREV_LINE Move to the previous line.

5 REQ_NEXT_WORD Move to the next word.

5 REQ_PREV_WORD Move to the previous word.

5 REQ_BEG_FIELD Move to the beginning of the field.

5 REQ_END_FIELD Move to the end of the field.

5 REQ_BEG_LINE Move to the beginning of the line.

5 REQ_END_LINE Move to the end of the line.

5 REQ_LEFT_CHAR Move left in the field.

5 REQ_RIGHT_CHAR Move right in the field.

5 REQ_UP_CHAR Move up in the field.

5 REQ_DOWN_CHAR Move down in the field.

5 REQ_NEW_LINE Insert or overlay a new line.

5 REQ_INS_CHAR Insert a blank at the cursor.

5 REQ_INS_LINE Insert a blank line at the cursor.

5 REQ_DEL_CHAR Delete character at the cursor.

5 REQ_DEL_PREV Delete character before the cursor.

5 REQ_DEL_LINE Delete line at the cursor.

5 REQ_DEL_WORD Delete blank-delimited word at the cursor.

5 REQ_CLR_EOL Clear to end of line from cursor.

5 REQ_CLR_EOF Clear to end of field from cursor.

5 REQ_CLR_FIELD Clear the entire field.

5 REQ_OVL_MODE Enter overlay mode.

5 REQ_INS_MODE Enter insert mode.

5 REQ_SCR_FLINE Scroll the field forward a line.

5 REQ_SCR_BLINE Scroll the field backward a line.

5 REQ_SCR_FPAGE Scroll the field forward a page.

5 REQ_SCR_BPAGE Scroll the field backward a page.

5 REQ_SCR_FHPAGE Scroll the field forward half a page.

5 REQ_SCR_BHPAGE Scroll the field backward half a page.

5 REQ_SCR_FCHAR Scroll the field forward a character.

5 REQ_SCR_BCHAR Scroll the field backward a character.

5 REQ_SCR_HFLINE Horizontal scroll the field forward a line.

5 REQ_SCR_HBLINE Horizontal scroll the field backward a line.

5 REQ_SCR_HFHALF Horizontal scroll the field forward half a line.

5 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.

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 decoration window) are handled.

If you click above the display region of the form:

If you click below the display region of the form:

If you click at an field inside the display area of the form:

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.

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_COMMAND, the maximum value of these pre-defined requests.

form_driver returns one of the following error codes:

5 E_OK The routine succeeded.

5 E_BAD_ARGUMENT Routine detected an incorrect or out-of-range argument.

5 E_BAD_STATE Routine was called from an initialization or termination function.

5 E_NOT_POSTED The form has not been posted.

5 E_INVALID_FIELD Contents of field is invalid.

5 E_REQUEST_DENIED The form driver could not process the request.

5 E_SYSTEM_ERROR System error occurred (see errno).

5 E_UNKNOWN_COMMAND The form driver code saw an unknown request code. .

curses(3X), form(3X), form_variables(3X), getch(3X). The header file <form.h> automatically includes the header files <curses.h>. These routines emulate the System V forms library. They were not supported on Version 7 or BSD versions. Juergen Pfeifer. Manual pages and adaptation for new curses by Eric S. Raymond.