-.'" $Id: form_driver.3x,v 0.5 1997/12/14 01:26:33 tom Exp $
+.\"***************************************************************************
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+.\" $Id: form_driver.3x,v 1.16 2008/06/21 21:55:39 tom Exp $
.TH form_driver 3X ""
.SH NAME
\fBform_driver\fR - command-processing loop of the form system
.br
.SH DESCRIPTION
Once a form has been posted (displayed), you should funnel input events to it
-through \fBform_driver\fR. This routine has two major input cases; either
-the input is a form navigation request or it's a printable ASCII character.
+through \fBform_driver\fR. This routine has three major input cases:
+.TP 3
+-
+The input is a form navigation request.
+Navigation request codes are constants defined in \fB<form.h>\fP,
+which are distinct from the key- and character codes returned by \fBwgetch\fP.
+.TP 3
+-
+The input is a printable character.
+Printable characters (which must be positive, less than 256) are
+checked according to the program's locale settings.
+.TP 3
+-
+The input is the KEY_MOUSE special key associated with an mouse event.
+.PP
The form driver requests are as follows:
.TP 5
REQ_NEXT_PAGE
.TP 5
REQ_LAST_PAGE
Move to the last field.
-
+.sp
.TP 5
REQ_NEXT_FIELD
Move to the next field.
.TP 5
REQ_DOWN_FIELD
Move down to a field.
-
+.sp
.TP 5
REQ_NEXT_CHAR
Move to the next char.
.TP 5
REQ_DOWN_CHAR
Move down in the field.
-
+.sp
.TP 5
REQ_NEW_LINE
Insert or overlay a new line.
.TP 5
REQ_INS_MODE
Enter insert mode.
-
+.sp
.TP 5
REQ_SCR_FLINE
Scroll the field forward a line.
.TP 5
REQ_SCR_BHPAGE
Scroll the field backward half a page.
-
+.sp
.TP 5
REQ_SCR_FCHAR
Scroll the field forward a character.
.TP 5
REQ_SCR_HBHALF
Horizontal scroll the field backward half a line.
-
+.sp
.TP
REQ_VALIDATION
Validate field.
REQ_PREV_CHOICE
Display previous field choice.
.PP
-If the second argument is a printable ASCII character, the driver places it
+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.
+.SS MOUSE HANDLING
+.PP
+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.
+.PP
+If you click above the display region of the form:
+.RS
+.TP
+a REQ_PREV_FIELD is generated for a single click,
+.TP
+a REQ_PREV_PAGE is generated for a double-click and
+.TP
+a REQ_FIRST_FIELD is generated for a triple-click.
+.RE
+.PP
+If you click below the display region of the form:
+.RS
+.TP
+a REQ_NEXT_FIELD is generated for a single click,
+.TP
+a REQ_NEXT_PAGE is generated for a double-click and
+.TP
+a REQ_LAST_FIELD is generated for a triple-click.
+.RE
.PP
-If the second argument is neither printable ASCII nor one of the above
-pre-defined form requests, the drive assumes it is an application-specific
+If you click at an field inside the display area of the form:
+.RS
+.TP 3
+-
+the form cursor is positioned to that field.
+.TP 3
+-
+If you double-click a field,
+the form cursor is positioned to that field
+and \fBE_UNKNOWN_COMMAND\fR 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.
+.TP 3
+-
+If a translation
+into a request was done, \fBform_driver\fR returns the result of this request.
+.RE
+.PP
+If you clicked outside the user window or the mouse event could not be translated
+into a form request an \fBE_REQUEST_DENIED\fR is returned.
+.SS APPLICATION-DEFINED COMMANDS
+.PP
+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 \fBE_UNKNOWN_COMMAND\fR. Application-defined commands
should be defined relative to \fBMAX_COMMAND\fR, the maximum value of these
pre-defined requests.
.SH RETURN VALUE
-\fBform_driver\fR return one of the following error codes:
+\fBform_driver\fR returns one of the following error codes:
.TP 5
-\fBE_OK\fR
+.B E_OK
The routine succeeded.
.TP 5
-\fBE_SYSTEM_ERROR\fR
-System error occurred (see \fBerrno\fR).
-.TP 5
-\fBE_BAD_ARGUMENT\fR
+.B E_BAD_ARGUMENT
Routine detected an incorrect or out-of-range argument.
.TP 5
-\fBE_BAD_STATE\fR
+.B E_BAD_STATE
Routine was called from an initialization or termination function.
.TP 5
-\fBE_NOT_POSTED\fR
+.B E_NOT_POSTED
The form has not been posted.
.TP 5
-\fBE_UNKNOWN_COMMAND\fR
-The form driver code saw an unknown request code.
-.TP 5
-\fBE_INVALID_FIELD\fR
+.B E_INVALID_FIELD
Contents of field is invalid.
.TP 5
-\fBE_REQUEST_DENIED\fR
+.B E_REQUEST_DENIED
The form driver could not process the request.
+.TP 5
+.B E_SYSTEM_ERROR
+System error occurred (see \fBerrno\fR).
+.TP 5
+.B E_UNKNOWN_COMMAND
+The form driver code saw an unknown request code.
+.
.SH SEE ALSO
-\fBcurses\fR(3X), \fBform\fR(3X).
+\fBcurses\fR(3X),
+\fBform\fR(3X),
+\fBwgetch\fR(3X).
.SH NOTES
The header file \fB<form.h>\fR automatically includes the header files
\fB<curses.h>\fR.
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