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41 <H1>menu_driver 3x</H1>
44 <STRONG><A HREF="menu_driver.3x.html">menu_driver(3x)</A></STRONG> <STRONG><A HREF="menu_driver.3x.html">menu_driver(3x)</A></STRONG>
50 <H2><a name="h2-NAME">NAME</a></H2><PRE>
51 <STRONG>menu_driver</STRONG> - command-processing loop of the menu system
55 <H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
56 <STRONG>#include</STRONG> <STRONG><menu.h></STRONG>
57 int menu_driver(MENU *menu, int c);
61 <H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
62 Once a menu has been posted (displayed), you should funnel
63 input events to it through <STRONG>menu_driver</STRONG>. This routine has
64 three major input cases:
66 <STRONG>o</STRONG> The input is a form navigation request. Navigation
67 request codes are constants defined in <STRONG><form.h></STRONG>, which
68 are distinct from the key- and character codes
69 returned by <STRONG>wgetch</STRONG>.
71 <STRONG>o</STRONG> The input is a printable character. Printable charac-
72 ters (which must be positive, less than 256) are
73 checked according to the program's locale settings.
75 <STRONG>o</STRONG> The input is the KEY_MOUSE special key associated with
78 The menu driver requests are as follows:
84 Move right to an item.
105 Move to the first item.
108 Move to the last item.
111 Move to the next item.
114 Move to the previous item.
117 Select/deselect an item.
120 Clear the menu pattern buffer.
123 Delete the previous character from the pattern buf-
127 Move to the next item matching the pattern match.
130 Move to the previous item matching the pattern match.
132 If the second argument is a printable character, the code
133 appends it to the pattern buffer and attempts to move to
134 the next item matching the new pattern. If there is no
135 such match, <STRONG>menu_driver</STRONG> returns <STRONG>E_NO_MATCH</STRONG> and deletes the
136 appended character from the buffer.
138 If the second argument is one of the above pre-defined
139 requests, the corresponding action is performed.
143 <H3><a name="h3-MOUSE-HANDLING">MOUSE HANDLING</a></H3><PRE>
144 If the second argument is the KEY_MOUSE special key, the
145 associated mouse event is translated into one of the above
146 pre-defined requests. Currently only clicks in the user
147 window (e.g., inside the menu display area or the decora-
148 tion window) are handled.
150 If you click above the display region of the menu:
152 <STRONG>o</STRONG> a REQ_SCR_ULINE is generated for a single click,
154 <STRONG>o</STRONG> a REQ_SCR_UPAGE is generated for a double-click and
156 <STRONG>o</STRONG> a REQ_FIRST_ITEM is generated for a triple-click.
158 If you click below the display region of the menu:
160 <STRONG>o</STRONG> a REQ_SCR_DLINE is generated for a single click,
162 <STRONG>o</STRONG> a REQ_SCR_DPAGE is generated for a double-click and
164 <STRONG>o</STRONG> a REQ_LAST_ITEM is generated for a triple-click.
166 If you click at an item inside the display area of the
169 <STRONG>o</STRONG> the menu cursor is positioned to that item.
171 <STRONG>o</STRONG> If you double-click an item a REQ_TOGGLE_ITEM is gen-
172 erated and <STRONG>E_UNKNOWN_COMMAND</STRONG> is returned. This return
173 value makes sense, because a double click usually
174 means that an item-specific action should be returned.
175 It is exactly the purpose of this return value to sig-
176 nal that an application specific command should be
179 <STRONG>o</STRONG> If a translation into a request was done, <STRONG>menu_driver</STRONG>
180 returns the result of this request.
182 If you clicked outside the user window or the mouse event
183 could not be translated into a menu request an
184 <STRONG>E_REQUEST_DENIED</STRONG> is returned.
188 <H3><a name="h3-APPLICATION-DEFINED-COMMANDS">APPLICATION-DEFINED COMMANDS</a></H3><PRE>
189 If the second argument is neither printable nor one of the
190 above pre-defined menu requests or KEY_MOUSE, the drive
191 assumes it is an application-specific command and returns
192 <STRONG>E_UNKNOWN_COMMAND</STRONG>. Application-defined commands should be
193 defined relative to <STRONG>MAX_COMMAND</STRONG>, the maximum value of
194 these pre-defined requests.
198 <H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
199 <STRONG>menu_driver</STRONG> return one of the following error codes:
201 <STRONG>E_OK</STRONG> The routine succeeded.
203 <STRONG>E_SYSTEM_ERROR</STRONG>
204 System error occurred (see <STRONG>errno</STRONG>).
206 <STRONG>E_BAD_ARGUMENT</STRONG>
207 Routine detected an incorrect or out-of-range argu-
210 <STRONG>E_BAD_STATE</STRONG>
211 Routine was called from an initialization or termina-
214 <STRONG>E_NOT_POSTED</STRONG>
215 The menu has not been posted.
217 <STRONG>E_UNKNOWN_COMMAND</STRONG>
218 The menu driver code saw an unknown request code.
220 <STRONG>E_NO_MATCH</STRONG>
221 Character failed to match.
223 <STRONG>E_REQUEST_DENIED</STRONG>
224 The menu driver could not process the request.
228 <H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
229 <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>.
233 <H2><a name="h2-NOTES">NOTES</a></H2><PRE>
234 The header file <STRONG><menu.h></STRONG> automatically includes the header
235 files <STRONG><curses.h></STRONG>.
239 <H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
240 These routines emulate the System V menu library. They
241 were not supported on Version 7 or BSD versions. The sup-
242 port for mouse events is ncurses specific.
246 <H2><a name="h2-AUTHORS">AUTHORS</a></H2><PRE>
247 Juergen Pfeifer. Manual pages and adaptation for new
248 curses by Eric S. Raymond.
252 <STRONG><A HREF="menu_driver.3x.html">menu_driver(3x)</A></STRONG>
256 <li><a href="#h2-NAME">NAME</a></li>
257 <li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
258 <li><a href="#h2-DESCRIPTION">DESCRIPTION</a>
260 <li><a href="#h3-MOUSE-HANDLING">MOUSE HANDLING</a></li>
261 <li><a href="#h3-APPLICATION-DEFINED-COMMANDS">APPLICATION-DEFINED COMMANDS</a></li>
264 <li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
265 <li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
266 <li><a href="#h2-NOTES">NOTES</a></li>
267 <li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
268 <li><a href="#h2-AUTHORS">AUTHORS</a></li>