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* @Id: menu_driver.3x,v 1.20 2010/12/04 18:38:55 tom Exp @
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<H1>menu_driver 3x</H1>
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<PRE>
<!-- Manpage converted by man2html 3.0.1 -->
<STRONG><A HREF="menu_driver.3x.html">menu_driver(3x)</A></STRONG> <STRONG><A HREF="menu_driver.3x.html">menu_driver(3x)</A></STRONG>
</PRE>
<H2>NAME</H2><PRE>
<STRONG>menu_driver</STRONG> - command-processing loop of the menu system
</PRE>
<H2>SYNOPSIS</H2><PRE>
<STRONG>#include</STRONG> <STRONG><menu.h></STRONG>
int menu_driver(MENU *menu, int c);
</PRE>
<H2>DESCRIPTION</H2><PRE>
Once a menu has been posted (displayed), you should funnel
input events to it through <STRONG>menu_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 menu driver requests are as follows:
REQ_LEFT_ITEM
Move left to an item.
REQ_RIGHT_ITEM
Move right to an item.
REQ_UP_ITEM
Move up to an item.
REQ_DOWN_ITEM
Move down to an item.
REQ_SCR_ULINE
Scroll up a line.
REQ_SCR_DLINE
Scroll down a line.
REQ_SCR_DPAGE
Scroll down a page.
REQ_SCR_UPAGE
Scroll up a page.
REQ_FIRST_ITEM
Move to the first item.
REQ_LAST_ITEM
Move to the last item.
REQ_NEXT_ITEM
Move to the next item.
REQ_PREV_ITEM
Move to the previous item.
REQ_TOGGLE_ITEM
Select/deselect an item.
REQ_CLEAR_PATTERN
Clear the menu pattern buffer.
REQ_BACK_PATTERN
Delete the previous character from the pattern
buffer.
REQ_NEXT_MATCH
Move to the next item matching the pattern match.
REQ_PREV_MATCH
Move to the previous item matching the pattern match.
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, <STRONG>menu_driver</STRONG> returns <STRONG>E_NO_MATCH</STRONG> and deletes the
appended character from the buffer.
If the second argument is one of the above pre-defined
requests, the corresponding action is performed.
<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 menu display area or the decora-
tion window) are handled.
If you click above the display region of the menu:
<STRONG>o</STRONG> a REQ_SCR_ULINE is generated for a single click,
<STRONG>o</STRONG> a REQ_SCR_UPAGE is generated for a double-click and
<STRONG>o</STRONG> a REQ_FIRST_ITEM is generated for a triple-click.
If you click below the display region of the menu:
<STRONG>o</STRONG> a REQ_SCR_DLINE is generated for a single click,
<STRONG>o</STRONG> a REQ_SCR_DPAGE is generated for a double-click and
<STRONG>o</STRONG> a REQ_LAST_ITEM is generated for a triple-click.
If you click at an item inside the display area of the
menu:
<STRONG>o</STRONG> the menu cursor is positioned to that item.
<STRONG>o</STRONG> If you double-click an item a REQ_TOGGLE_ITEM is gen-
erated and <STRONG>E_UNKNOWN_COMMAND</STRONG> 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 sig-
nal that an application specific command should be
executed.
<STRONG>o</STRONG> If a translation into a request was done, <STRONG>menu_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 menu 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 menu requests or KEY_MOUSE, the drive
assumes it is an application-specific command and returns
<STRONG>E_UNKNOWN_COMMAND</STRONG>. Application-defined commands should be
defined relative to <STRONG>MAX_COMMAND</STRONG>, the maximum value of
these pre-defined requests.
</PRE>
<H2>RETURN VALUE</H2><PRE>
<STRONG>menu_driver</STRONG> return one of the following error codes:
<STRONG>E_OK</STRONG> The routine succeeded.
<STRONG>E_SYSTEM_ERROR</STRONG>
System error occurred (see <STRONG>errno</STRONG>).
<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 menu has not been posted.
<STRONG>E_UNKNOWN_COMMAND</STRONG>
The menu driver code saw an unknown request code.
<STRONG>E_NO_MATCH</STRONG>
Character failed to match.
<STRONG>E_REQUEST_DENIED</STRONG>
The menu driver could not process the request.
</PRE>
<H2>SEE ALSO</H2><PRE>
<STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="menu.3x.html">menu(3x)</A></STRONG>, <STRONG><A HREF="getch.3x.html">getch(3x)</A></STRONG>.
</PRE>
<H2>NOTES</H2><PRE>
The header file <STRONG><menu.h></STRONG> automatically includes the header
files <STRONG><curses.h></STRONG>.
</PRE>
<H2>PORTABILITY</H2><PRE>
These routines emulate the System V menu library. They
were not supported on Version 7 or BSD versions. The sup-
port for mouse events is ncurses specific.
</PRE>
<H2>AUTHORS</H2><PRE>
Juergen Pfeifer. Manual pages and adaptation for new
curses by Eric S. Raymond.
<STRONG><A HREF="menu_driver.3x.html">menu_driver(3x)</A></STRONG>
</PRE>
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