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* @Id: form_driver.3x,v 1.22 2010/12/04 18:38:55 tom Exp @
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<TITLE>form_driver 3x</TITLE>
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<H1>form_driver 3x</H1>
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<PRE>
<!-- Manpage converted by man2html 3.0.1 -->
<STRONG><A HREF="form_driver.3x.html">form_driver(3x)</A></STRONG> <STRONG><A HREF="form_driver.3x.html">form_driver(3x)</A></STRONG>
</PRE>
<H2>NAME</H2><PRE>
<STRONG>form_driver</STRONG> - command-processing loop of the form system
</PRE>
<H2>SYNOPSIS</H2><PRE>
<STRONG>#include</STRONG> <STRONG><form.h></STRONG>
int form_driver(FORM *form, int c);
</PRE>
<H2>DESCRIPTION</H2><PRE>
Once a form has been posted (displayed), you should funnel
input events to it through <STRONG>form_driver</STRONG>. This routine has
three major input cases:
<STRONG>o</STRONG> The input is a form navigation request. Navigation
request codes are constants defined in <STRONG><form.h></STRONG>, which
are distinct from the key- and character codes
returned by <STRONG>wgetch</STRONG>.
<STRONG>o</STRONG> 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.
<STRONG>o</STRONG> 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.
<STRONG>MOUSE</STRONG> <STRONG>HANDLING</STRONG>
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:
<STRONG>o</STRONG> the form cursor is positioned to that field.
<STRONG>o</STRONG> If you double-click a field, the form cursor is
positioned to that field and <STRONG>E_UNKNOWN_COMMAND</STRONG> 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.
<STRONG>o</STRONG> If a translation into a request was done,
<STRONG>form_driver</STRONG> 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
<STRONG>E_REQUEST_DENIED</STRONG> is returned.
<STRONG>APPLICATION-DEFINED</STRONG> <STRONG>COMMANDS</STRONG>
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 <STRONG>E_UNKNOWN_COM-</STRONG>
<STRONG>MAND</STRONG>. Application-defined commands should be defined rel-
ative to <STRONG>MAX_COMMAND</STRONG>, the maximum value of these pre-
defined requests.
</PRE>
<H2>RETURN VALUE</H2><PRE>
<STRONG>form_driver</STRONG> returns one of the following error codes:
<STRONG>E_OK</STRONG> The routine succeeded.
<STRONG>E_BAD_ARGUMENT</STRONG>
Routine detected an incorrect or out-of-range argu-
ment.
<STRONG>E_BAD_STATE</STRONG>
Routine was called from an initialization or termina-
tion function.
<STRONG>E_NOT_POSTED</STRONG>
The form has not been posted.
<STRONG>E_INVALID_FIELD</STRONG>
Contents of field is invalid.
<STRONG>E_REQUEST_DENIED</STRONG>
The form driver could not process the request.
<STRONG>E_SYSTEM_ERROR</STRONG>
System error occurred (see <STRONG>errno</STRONG>).
<STRONG>E_UNKNOWN_COMMAND</STRONG>
The form driver code saw an unknown request code.
</PRE>
<H2>SEE ALSO</H2><PRE>
<STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="form.3x.html">form(3x)</A></STRONG>, <STRONG><A HREF="form_variables.3x.html">form_variables(3x)</A></STRONG>, <STRONG><A HREF="curs_getch.3x.html">curs_getch(3x)</A></STRONG>.
</PRE>
<H2>NOTES</H2><PRE>
The header file <STRONG><form.h></STRONG> automatically includes the header
files <STRONG><curses.h></STRONG>.
</PRE>
<H2>PORTABILITY</H2><PRE>
These routines emulate the System V forms library. They
were not supported on Version 7 or BSD versions.
</PRE>
<H2>AUTHORS</H2><PRE>
Juergen Pfeifer. Manual pages and adaptation for new
curses by Eric S. Raymond.
<STRONG><A HREF="form_driver.3x.html">form_driver(3x)</A></STRONG>
</PRE>
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