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* @Id: menu_driver.3x,v 1.20 2010/12/04 18:38:55 tom Exp @
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<TITLE>menu_driver 3x</TITLE>
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<link rev=made href="mailto:bug-ncurses@gnu.org">
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<H1 class="no-header">menu_driver 3x</H1>
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<PRE>
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<STRONG><A HREF="menu_driver.3x.html">menu_driver(3x)</A></STRONG> <STRONG><A HREF="menu_driver.3x.html">menu_driver(3x)</A></STRONG>
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</PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
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<STRONG>menu_driver</STRONG> - command-processing loop of the menu system
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</PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
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<STRONG>#include</STRONG> <STRONG><menu.h></STRONG>
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int menu_driver(MENU *menu, int c);
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</PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
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Once a menu has been posted (displayed), you should funnel
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input events to it through <STRONG>menu_driver</STRONG>. This routine has
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three major input cases:
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<STRONG>o</STRONG> The input is a form navigation request. Navigation
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request codes are constants defined in <STRONG><form.h></STRONG>, which
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are distinct from the key- and character codes
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returned by <STRONG>wgetch</STRONG>.
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<STRONG>o</STRONG> The input is a printable character. Printable charac-
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ters (which must be positive, less than 256) are
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checked according to the program's locale settings.
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<STRONG>o</STRONG> The input is the KEY_MOUSE special key associated with
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an mouse event.
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The menu driver requests are as follows:
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REQ_LEFT_ITEM
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Move left to an item.
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REQ_RIGHT_ITEM
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Move right to an item.
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REQ_UP_ITEM
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Move up to an item.
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REQ_DOWN_ITEM
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Move down to an item.
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REQ_SCR_ULINE
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Scroll up a line.
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REQ_SCR_DLINE
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Scroll down a line.
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REQ_SCR_DPAGE
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Scroll down a page.
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REQ_SCR_UPAGE
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Scroll up a page.
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REQ_FIRST_ITEM
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Move to the first item.
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REQ_LAST_ITEM
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Move to the last item.
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REQ_NEXT_ITEM
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Move to the next item.
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REQ_PREV_ITEM
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Move to the previous item.
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REQ_TOGGLE_ITEM
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Select/deselect an item.
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REQ_CLEAR_PATTERN
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Clear the menu pattern buffer.
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REQ_BACK_PATTERN
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Delete the previous character from the pattern buf-
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fer.
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REQ_NEXT_MATCH
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Move to the next item matching the pattern match.
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REQ_PREV_MATCH
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Move to the previous item matching the pattern match.
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If the second argument is a printable character, the code
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appends it to the pattern buffer and attempts to move to
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the next item matching the new pattern. If there is no
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such match, <STRONG>menu_driver</STRONG> returns <STRONG>E_NO_MATCH</STRONG> and deletes the
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appended character from the buffer.
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If the second argument is one of the above pre-defined
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requests, the corresponding action is performed.
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</PRE><H3><a name="h3-MOUSE-HANDLING">MOUSE HANDLING</a></H3><PRE>
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If the second argument is the KEY_MOUSE special key, the
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associated mouse event is translated into one of the above
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pre-defined requests. Currently only clicks in the user
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window (e.g., inside the menu display area or the decora-
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tion window) are handled.
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If you click above the display region of the menu:
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<STRONG>o</STRONG> a REQ_SCR_ULINE is generated for a single click,
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<STRONG>o</STRONG> a REQ_SCR_UPAGE is generated for a double-click and
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<STRONG>o</STRONG> a REQ_FIRST_ITEM is generated for a triple-click.
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If you click below the display region of the menu:
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<STRONG>o</STRONG> a REQ_SCR_DLINE is generated for a single click,
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<STRONG>o</STRONG> a REQ_SCR_DPAGE is generated for a double-click and
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<STRONG>o</STRONG> a REQ_LAST_ITEM is generated for a triple-click.
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If you click at an item inside the display area of the
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menu:
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<STRONG>o</STRONG> the menu cursor is positioned to that item.
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<STRONG>o</STRONG> If you double-click an item a REQ_TOGGLE_ITEM is gen-
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erated and <STRONG>E_UNKNOWN_COMMAND</STRONG> is returned. This return
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value makes sense, because a double click usually
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means that an item-specific action should be returned.
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It is exactly the purpose of this return value to sig-
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nal that an application specific command should be
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executed.
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<STRONG>o</STRONG> If a translation into a request was done, <STRONG>menu_driver</STRONG>
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returns the result of this request.
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If you clicked outside the user window or the mouse event
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could not be translated into a menu request an
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<STRONG>E_REQUEST_DENIED</STRONG> is returned.
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</PRE><H3><a name="h3-APPLICATION-DEFINED-COMMANDS">APPLICATION-DEFINED COMMANDS</a></H3><PRE>
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If the second argument is neither printable nor one of the
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above pre-defined menu requests or KEY_MOUSE, the drive
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assumes it is an application-specific command and returns
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<STRONG>E_UNKNOWN_COMMAND</STRONG>. Application-defined commands should be
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defined relative to <STRONG>MAX_COMMAND</STRONG>, the maximum value of
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these pre-defined requests.
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</PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
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<STRONG>menu_driver</STRONG> return one of the following error codes:
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<STRONG>E_OK</STRONG> The routine succeeded.
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<STRONG>E_SYSTEM_ERROR</STRONG>
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System error occurred (see <STRONG>errno</STRONG>).
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<STRONG>E_BAD_ARGUMENT</STRONG>
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Routine detected an incorrect or out-of-range argu-
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ment.
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<STRONG>E_BAD_STATE</STRONG>
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Routine was called from an initialization or termina-
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tion function.
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<STRONG>E_NOT_POSTED</STRONG>
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The menu has not been posted.
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<STRONG>E_UNKNOWN_COMMAND</STRONG>
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The menu driver code saw an unknown request code.
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<STRONG>E_NO_MATCH</STRONG>
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Character failed to match.
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<STRONG>E_REQUEST_DENIED</STRONG>
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The menu driver could not process the request.
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</PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
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<STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="menu.3x.html">menu(3x)</A></STRONG>, <STRONG><A HREF="curs_getch.3x.html">curs_getch(3x)</A></STRONG>.
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</PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
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The header file <STRONG><menu.h></STRONG> automatically includes the header
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files <STRONG><curses.h></STRONG>.
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</PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
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These routines emulate the System V menu library. They
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were not supported on Version 7 or BSD versions. The sup-
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port for mouse events is ncurses specific.
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</PRE><H2><a name="h2-AUTHORS">AUTHORS</a></H2><PRE>
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Juergen Pfeifer. Manual pages and adaptation for new
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curses by Eric S. Raymond.
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<STRONG><A HREF="menu_driver.3x.html">menu_driver(3x)</A></STRONG>
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</PRE>
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<div class="nav">
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<ul>
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<li><a href="#h2-NAME">NAME</a></li>
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<li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
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<li><a href="#h2-DESCRIPTION">DESCRIPTION</a>
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<ul>
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<li><a href="#h3-MOUSE-HANDLING">MOUSE HANDLING</a></li>
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<li><a href="#h3-APPLICATION-DEFINED-COMMANDS">APPLICATION-DEFINED COMMANDS</a></li>
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</ul>
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</li>
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<li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
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<li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
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<li><a href="#h2-NOTES">NOTES</a></li>
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<li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
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<li><a href="#h2-AUTHORS">AUTHORS</a></li>
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</ul>
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