1999-10-24 12:32:42 +08:00
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.\"***************************************************************************
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.\" Copyright (c) 1998 Free Software Foundation, Inc. *
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.\" *
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.\" Permission is hereby granted, free of charge, to any person obtaining a *
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.\" copy of this software and associated documentation files (the *
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.\" "Software"), to deal in the Software without restriction, including *
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.\" without limitation the rights to use, copy, modify, merge, publish, *
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.\" distribute, distribute with modifications, sublicense, and/or sell *
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.\" copies of the Software, and to permit persons to whom the Software is *
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.\" furnished to do so, subject to the following conditions: *
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.\" *
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.\" The above copyright notice and this permission notice shall be included *
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.\" in all copies or substantial portions of the Software. *
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.\" THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
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.\" MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
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.\" IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
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.\" *
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.\" Except as contained in this notice, the name(s) of the above copyright *
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.\" authorization. *
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.\"***************************************************************************
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.\"
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.'" $Id: menu_driver.3x,v 1.8 1999/01/09 22:55:18 tom Exp $
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1997-05-15 12:00:00 +08:00
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.TH menu_driver 3X ""
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.SH NAME
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\fBmenu_driver\fR - command-processing loop of the menu system
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.SH SYNOPSIS
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\fB#include <menu.h>\fR
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.br
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int menu_driver(MENU *menu, int c);
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.br
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.SH DESCRIPTION
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Once a menu has been posted (displayed), you should funnel input events to it
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through \fBmenu_driver\fR. This routine has three major input cases; either
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the input is a menu navigation request, it's a printable ASCII character or it
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is the KEY_MOUSE special key associated with an mouse event.
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The menu driver requests are as follows:
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.TP 5
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REQ_LEFT_ITEM
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Move left to an item.
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.TP 5
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REQ_RIGHT_ITEM
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Move right to an item.
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.TP 5
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REQ_UP_ITEM
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Move up to an item.
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.TP 5
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REQ_DOWN_ITEM
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Move down to an item.
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.TP 5
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REQ_SCR_ULINE
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Scroll up a line.
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.TP 5
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REQ_SCR_DLINE
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Scroll down a line.
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.TP 5
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REQ_SCR_DPAGE
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Scroll down a page.
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.TP 5
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REQ_SCR_UPAGE
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Scroll up a page.
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.TP 5
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REQ_FIRST_ITEM
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Move to the first item.
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.TP 5
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REQ_LAST_ITEM
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Move to the last item.
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.TP 5
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REQ_NEXT_ITEM
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Move to the next item.
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.TP 5
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REQ_PREV_ITEM
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Move to the previous item.
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.TP 5
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REQ_TOGGLE_ITEM
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Select/deselect an item.
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.TP 5
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REQ_CLEAR_PATTERN
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Clear the menu pattern buffer.
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.TP 5
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REQ_BACK_PATTERN
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Delete the previous character from the pattern buffer.
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.TP 5
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REQ_NEXT_MATCH
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Move to the next item matching the pattern match.
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.TP 5
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REQ_PREV_MATCH
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Move to the previous item matching the pattern match.
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.PP
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If the second argument is a printable ASCII character, the code appends
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it to the pattern buffer and attempts to move to the next item matching
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the new pattern. If there is no such match, \fBmenu_driver\fR returns
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\fBE_NO_MATCH\fR and deletes the appended character from the buffer.
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.PP
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If the second argument is one of the above pre-defined requests, the
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corresponding action is performed.
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.PP
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If the second argument is the KEY_MOUSE special key, the associated
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mouse event is translated into one of the above pre-defined requests.
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Currently only clicks in the user window (e.g. inside the menu display
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area or the decoration window) are handled. If you click above the
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display region of the menu, a REQ_SCR_ULINE is generated, if you
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doubleclick a REQ_SCR_UPAGE is generated and if you tripleclick a
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REQ_FIRST_ITEM is generated. If you click below the display region of
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the menu, a REQ_SCR_DLINE is generated, if you doubleclick a REQ_SCR_DPAGE
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is generated and if you tripleclick a REQ_LAST_ITEM is generated. If you
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click at an item inside the display area of the menu, the menu cursor
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is positioned to that item. If you double-click at an item a REQ_TOGGLE_ITEM
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is generated and \fBE_UNKNOWN_COMMAND\fR is returned. This return value makes
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sense, because a double click usually means that an item-specific action should
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be returned. It's exactly the purpose of this return value to signal that an
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application specific command should be executed. If a translation
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into a request was done, \fBmenu_driver\fR returns the result of this request.
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If you clicked outside the user window or the mouse event couldn't be translated
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into a menu request an \fBE_REQUEST_DENIED\fR is returned.
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.PP
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If the second argument is neither printable ASCII nor one of the above
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pre-defined menu requests or KEY_MOUSE, the drive assumes it is an application-specific
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command and returns \fBE_UNKNOWN_COMMAND\fR. Application-defined commands
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should be defined relative to \fBMAX_COMMAND\fR, the maximum value of these
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pre-defined requests.
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.SH RETURN VALUE
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\fBmenu_driver\fR return one of the following error codes:
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.TP 5
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\fBE_OK\fR
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The routine succeeded.
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.TP 5
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\fBE_SYSTEM_ERROR\fR
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System error occurred (see \fBerrno\fR).
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.TP 5
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\fBE_BAD_ARGUMENT\fR
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Routine detected an incorrect or out-of-range argument.
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.TP 5
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\fBE_BAD_STATE\fR
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Routine was called from an initialization or termination function.
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.TP 5
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\fBE_NOT_POSTED\fR
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The menu has not been posted.
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.TP 5
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\fBE_UNKNOWN_COMMAND\fR
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The menu driver code saw an unknown request code.
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.TP 5
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\fBE_NO_MATCH\fR
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Character failed to match.
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.TP 5
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\fBE_REQUEST_DENIED\fR
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The menu driver could not process the request.
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.SH SEE ALSO
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1998-03-01 12:21:12 +08:00
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\fBcurses\fR(3X), \fBmenu\fR(3X).
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1997-05-15 12:00:00 +08:00
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.SH NOTES
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The header file \fB<menu.h>\fR automatically includes the header files
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\fB<curses.h>\fR.
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.SH PORTABILITY
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These routines emulate the System V menu library. They were not supported on
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Version 7 or BSD versions. The support for mouse events is ncurses specific.
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1997-05-15 12:00:00 +08:00
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.SH AUTHORS
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Juergen Pfeifer. Manual pages and adaptation for new curses by Eric
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S. Raymond.
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.\"#
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.\"# The following sets edit modes for GNU EMACS
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.\"# Local Variables:
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.\"# mode:nroff
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.\"# fill-column:79
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.\"# End:
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