release/src/router/libncurses/doc/html/man/menu_driver.3x.html

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  41 <H1 class="no-header">menu_driver 3x</H1>
  42 <PRE>
  43 <STRONG><A HREF="menu_driver.3x.html">menu_driver(3x)</A></STRONG>                                         <STRONG><A HREF="menu_driver.3x.html">menu_driver(3x)</A></STRONG>
  44
  45
  46
  47
  48 </PRE>
  49 <H2><a name="h2-NAME">NAME</a></H2><PRE>
  50        <STRONG>menu_driver</STRONG> - command-processing loop of the menu system
  51
  52
  53 </PRE>
  54 <H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
  55        <STRONG>#include</STRONG> <STRONG>&lt;menu.h&gt;</STRONG>
  56        int menu_driver(MENU *menu, int c);
  57
  58
  59 </PRE>
  60 <H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
  61        Once a menu has been posted (displayed), you should funnel
  62        input events to it through <STRONG>menu_driver</STRONG>.  This routine  has
  63        three major input cases:
  64
  65        <STRONG>o</STRONG>   The  input  is  a form navigation request.  Navigation
  66            request codes are constants defined in <STRONG>&lt;form.h&gt;</STRONG>, which
  67            are   distinct  from  the  key-  and  character  codes
  68            returned by <STRONG>wgetch</STRONG>.
  69
  70        <STRONG>o</STRONG>   The input is a printable character.  Printable charac-
  71            ters  (which  must  be  positive,  less  than 256) are
  72            checked according to the program's locale settings.
  73
  74        <STRONG>o</STRONG>   The input is the KEY_MOUSE special key associated with
  75            an mouse event.
  76
  77        The menu driver requests are as follows:
  78
  79        REQ_LEFT_ITEM
  80             Move left to an item.
  81
  82        REQ_RIGHT_ITEM
  83             Move right to an item.
  84
  85        REQ_UP_ITEM
  86             Move up to an item.
  87
  88        REQ_DOWN_ITEM
  89             Move down to an item.
  90
  91        REQ_SCR_ULINE
  92             Scroll up a line.
  93
  94        REQ_SCR_DLINE
  95             Scroll down a line.
  96
  97        REQ_SCR_DPAGE
  98             Scroll down a page.
  99
 100        REQ_SCR_UPAGE
 101             Scroll up a page.
 102
 103        REQ_FIRST_ITEM
 104             Move to the first item.
 105
 106        REQ_LAST_ITEM
 107             Move to the last item.
 108
 109        REQ_NEXT_ITEM
 110             Move to the next item.
 111
 112        REQ_PREV_ITEM
 113             Move to the previous item.
 114
 115        REQ_TOGGLE_ITEM
 116             Select/deselect an item.
 117
 118        REQ_CLEAR_PATTERN
 119             Clear the menu pattern buffer.
 120
 121        REQ_BACK_PATTERN
 122             Delete  the  previous character from the pattern buf-
 123             fer.
 124
 125        REQ_NEXT_MATCH
 126             Move to the next item matching the pattern match.
 127
 128        REQ_PREV_MATCH
 129             Move to the previous item matching the pattern match.
 130
 131        If the second argument is a printable character, the  code
 132        appends  it  to the pattern buffer and attempts to move to
 133        the next item matching the new pattern.  If  there  is  no
 134        such match, <STRONG>menu_driver</STRONG> returns <STRONG>E_NO_MATCH</STRONG> and deletes the
 135        appended character from the buffer.
 136
 137        If the second argument is one  of  the  above  pre-defined
 138        requests, the corresponding action is performed.
 139
 140
 141 </PRE>
 142 <H3><a name="h3-MOUSE-HANDLING">MOUSE HANDLING</a></H3><PRE>
 143        If  the  second argument is the KEY_MOUSE special key, the
 144        associated mouse event is translated into one of the above
 145        pre-defined  requests.   Currently only clicks in the user
 146        window (e.g., inside the menu display area or the  decora-
 147        tion window) are handled.
 148
 149        If you click above the display region of the menu:
 150
 151        <STRONG>o</STRONG>   a REQ_SCR_ULINE is generated for a single click,
 152
 153        <STRONG>o</STRONG>   a REQ_SCR_UPAGE is generated for a double-click and
 154
 155        <STRONG>o</STRONG>   a REQ_FIRST_ITEM is generated for a triple-click.
 156
 157        If you click below the display region of the menu:
 158
 159        <STRONG>o</STRONG>   a REQ_SCR_DLINE is generated for a single click,
 160
 161        <STRONG>o</STRONG>   a REQ_SCR_DPAGE is generated for a double-click and
 162
 163        <STRONG>o</STRONG>   a REQ_LAST_ITEM is generated for a triple-click.
 164
 165        If  you  click  at  an item inside the display area of the
 166        menu:
 167
 168        <STRONG>o</STRONG>   the menu cursor is positioned to that item.
 169
 170        <STRONG>o</STRONG>   If you double-click an item a REQ_TOGGLE_ITEM is  gen-
 171            erated and <STRONG>E_UNKNOWN_COMMAND</STRONG> is returned.  This return
 172            value makes sense,  because  a  double  click  usually
 173            means that an item-specific action should be returned.
 174            It is exactly the purpose of this return value to sig-
 175            nal  that  an  application  specific command should be
 176            executed.
 177
 178        <STRONG>o</STRONG>   If a translation into a request was done,  <STRONG>menu_driver</STRONG>
 179            returns the result of this request.
 180
 181        If  you clicked outside the user window or the mouse event
 182        could  not  be  translated  into   a   menu   request   an
 183        <STRONG>E_REQUEST_DENIED</STRONG> is returned.
 184
 185
 186 </PRE>
 187 <H3><a name="h3-APPLICATION-DEFINED-COMMANDS">APPLICATION-DEFINED COMMANDS</a></H3><PRE>
 188        If the second argument is neither printable nor one of the
 189        above pre-defined menu requests or  KEY_MOUSE,  the  drive
 190        assumes  it is an application-specific command and returns
 191        <STRONG>E_UNKNOWN_COMMAND</STRONG>.  Application-defined commands should be
 192        defined  relative  to  <STRONG>MAX_COMMAND</STRONG>,  the  maximum value of
 193        these pre-defined requests.
 194
 195
 196 </PRE>
 197 <H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
 198        <STRONG>menu_driver</STRONG> return one of the following error codes:
 199
 200        <STRONG>E_OK</STRONG> The routine succeeded.
 201
 202        <STRONG>E_SYSTEM_ERROR</STRONG>
 203             System error occurred (see <STRONG>errno</STRONG>).
 204
 205        <STRONG>E_BAD_ARGUMENT</STRONG>
 206             Routine detected an incorrect or  out-of-range  argu-
 207             ment.
 208
 209        <STRONG>E_BAD_STATE</STRONG>
 210             Routine was called from an initialization or termina-
 211             tion function.
 212
 213        <STRONG>E_NOT_POSTED</STRONG>
 214             The menu has not been posted.
 215
 216        <STRONG>E_UNKNOWN_COMMAND</STRONG>
 217             The menu driver code saw an unknown request code.
 218
 219        <STRONG>E_NO_MATCH</STRONG>
 220             Character failed to match.
 221
 222        <STRONG>E_REQUEST_DENIED</STRONG>
 223             The menu driver could not process the request.
 224
 225
 226 </PRE>
 227 <H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
 228        <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>.
 229
 230
 231 </PRE>
 232 <H2><a name="h2-NOTES">NOTES</a></H2><PRE>
 233        The header file <STRONG>&lt;menu.h&gt;</STRONG> automatically includes the header
 234        files <STRONG>&lt;curses.h&gt;</STRONG>.
 235
 236
 237 </PRE>
 238 <H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
 239        These  routines  emulate  the System V menu library.  They
 240        were not supported on Version 7 or BSD versions. The  sup-
 241        port for mouse events is ncurses specific.
 242
 243
 244 </PRE>
 245 <H2><a name="h2-AUTHORS">AUTHORS</a></H2><PRE>
 246        Juergen  Pfeifer.   Manual  pages  and  adaptation for new
 247        curses by Eric S. Raymond.
 248
 249
 250
 251                                                         <STRONG><A HREF="menu_driver.3x.html">menu_driver(3x)</A></STRONG>
 252 </PRE>
 253 <div class="nav">
 254 <ul>
 255 <li><a href="#h2-NAME">NAME</a></li>
 256 <li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
 257 <li><a href="#h2-DESCRIPTION">DESCRIPTION</a>
 258 <ul>
 259 <li><a href="#h3-MOUSE-HANDLING">MOUSE HANDLING</a></li>
 260 <li><a href="#h3-APPLICATION-DEFINED-COMMANDS">APPLICATION-DEFINED COMMANDS</a></li>
 261 </ul>
 262 </li>
 263 <li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
 264 <li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
 265 <li><a href="#h2-NOTES">NOTES</a></li>
 266 <li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
 267 <li><a href="#h2-AUTHORS">AUTHORS</a></li>
 268 </ul>
 269 </div>
 270 </BODY>
 271 </HTML>