-.'" $Id: menu_driver.3x,v 1.5 1997/12/14 01:28:42 tom Exp $
+.\"***************************************************************************
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+.\"
+.\" $Id: menu_driver.3x,v 1.21 2017/01/07 19:25:15 tom Exp $
.TH menu_driver 3X ""
+.de bP
+.IP \(bu 4
+..
.SH NAME
-\fBmenu_driver\fR - command-processing loop of the menu system
+\fBmenu_driver\fR \- command-processing loop of the menu system
.SH SYNOPSIS
\fB#include <menu.h>\fR
.br
.br
.SH DESCRIPTION
Once a menu has been posted (displayed), you should funnel input events to it
-through \fBmenu_driver\fR. This routine has two major input cases; either
-the input is a menu navigation request or it's a printable ASCII character.
+through \fBmenu_driver\fR. This routine has three major input cases:
+.bP
+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(3X).
+.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.
+.PP
The menu driver requests are as follows:
.TP 5
REQ_LEFT_ITEM
REQ_PREV_MATCH
Move to the previous item matching the pattern match.
.PP
-If the second argument is a printable ASCII character, the code appends
+If the second argument is a printable character, the code appends
it to the pattern buffer and attempts to move to the next item matching
the new pattern. If there is no such match, \fBmenu_driver\fR returns
\fBE_NO_MATCH\fR and deletes the appended character from the buffer.
.PP
If the second argument is one of the above pre-defined requests, the
corresponding action is performed.
+.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 menu display
+area or the decoration window) are handled.
+.PP
+If you click above the display region of the menu:
+.bP
+a REQ_SCR_ULINE is generated for a single click,
+.bP
+a REQ_SCR_UPAGE is generated for a double-click and
+.bP
+a REQ_FIRST_ITEM is generated for a triple-click.
+.PP
+If you click below the display region of the menu:
+.bP
+a REQ_SCR_DLINE is generated for a single click,
+.bP
+a REQ_SCR_DPAGE is generated for a double-click and
+.bP
+a REQ_LAST_ITEM is generated for a triple-click.
+.PP
+If you click at an item inside the display area of the menu:
+.bP
+the menu cursor is positioned to that item.
+.bP
+If you double-click an item a REQ_TOGGLE_ITEM
+is generated and \fBE_UNKNOWN_COMMAND\fR is returned.
+This return value makes sense,
+because a double click usually means that an item-specific action should
+be returned.
+It is exactly the purpose of this return value to signal that an
+application specific command should be executed.
+.bP
+If a translation
+into a request was done, \fBmenu_driver\fR returns the result of this request.
+.PP
+If you clicked outside the user window or the mouse event could not be translated
+into a menu request an \fBE_REQUEST_DENIED\fR is returned.
+.SS APPLICATION-DEFINED COMMANDS
.PP
-If the second argument is neither printable ASCII nor one of the above
-pre-defined menu requests, the drive assumes it is an application-specific
+If the second argument is neither printable nor one of the above
+pre-defined menu requests or KEY_MOUSE, the drive 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
\fBmenu_driver\fR return one of the following error codes:
.TP 5
-\fBE_OK\fR
+.B E_OK
The routine succeeded.
.TP 5
-\fBE_SYSTEM_ERROR\fR
+.B E_SYSTEM_ERROR
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 menu has not been posted.
.TP 5
-\fBE_UNKNOWN_COMMAND\fR
+.B E_UNKNOWN_COMMAND
The menu driver code saw an unknown request code.
.TP 5
-\fBE_NO_MATCH\fR
+.B E_NO_MATCH
Character failed to match.
.TP 5
-\fBE_REQUEST_DENIED\fR
+.B E_REQUEST_DENIED
The menu driver could not process the request.
.SH SEE ALSO
-\fBcurses\fR(3X), \fBmenu\fR(3X).
+\fBcurses\fR(3X),
+\fBmenu\fR(3X),
+\fBgetch\fR(3X).
.SH NOTES
The header file \fB<menu.h>\fR automatically includes the header files
\fB<curses.h>\fR.
.SH PORTABILITY
These routines emulate the System V menu library. They were not supported on
-Version 7 or BSD versions.
+Version 7 or BSD versions. The support for mouse events is ncurses specific.
.SH AUTHORS
Juergen Pfeifer. Manual pages and adaptation for new curses by Eric
S. Raymond.
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