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

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  29   * @Id: form_driver.3x,v 1.24 2015/08/02 18:21:11 tom Exp @
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  41 <H1 class="no-header">form_driver 3x</H1>
  42 <PRE>
  43 <STRONG><A HREF="form_driver.3x.html">form_driver(3x)</A></STRONG>                                         <STRONG><A HREF="form_driver.3x.html">form_driver(3x)</A></STRONG>
  44
  45
  46
  47
  48 </PRE>
  49 <H2><a name="h2-NAME">NAME</a></H2><PRE>
  50        <STRONG>form_driver</STRONG> - command-processing loop of the form system
  51
  52
  53 </PRE>
  54 <H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
  55        <STRONG>#include</STRONG> <STRONG>&lt;form.h&gt;</STRONG>
  56        <STRONG>int</STRONG> <STRONG>form_driver(FORM</STRONG> <STRONG>*</STRONG><EM>form</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>c</EM><STRONG>);</STRONG>
  57        <STRONG>int</STRONG> <STRONG>form_driver_w(FORM</STRONG> <STRONG>*</STRONG><EM>form</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>c</EM><STRONG>,</STRONG> <STRONG>wchar_t</STRONG> <EM>wch</EM><STRONG>);</STRONG>
  58
  59
  60 </PRE>
  61 <H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
  62
  63 </PRE>
  64 <H3><a name="h3-form_driver">form_driver</a></H3><PRE>
  65        Once a form has been posted (displayed), you should funnel
  66        input events to it through <STRONG>form_driver</STRONG>.  This routine  has
  67        three major input cases:
  68
  69        <STRONG>o</STRONG>   The  input  is  a form navigation request.  Navigation
  70            request codes are constants defined in <STRONG>&lt;form.h&gt;</STRONG>, which
  71            are   distinct  from  the  key-  and  character  codes
  72            returned by <STRONG><A HREF="wgetch.3x.html">wgetch(3x)</A></STRONG>.
  73
  74        <STRONG>o</STRONG>   The input is a printable character.  Printable charac-
  75            ters  (which  must  be  positive,  less  than 256) are
  76            checked according to the program's locale settings.
  77
  78        <STRONG>o</STRONG>   The input is the KEY_MOUSE special key associated with
  79            an mouse event.
  80
  81
  82 </PRE>
  83 <H3><a name="h3-form_driver_w">form_driver_w</a></H3><PRE>
  84        This  extension  simplifies  the  use of the forms library
  85        using wide characters.  The input is either a key code  (a
  86        request) or a wide character returned by <STRONG><A HREF="get_wch.3x.html">get_wch(3x)</A></STRONG>.  The
  87        type must be passed as well,  to  enable  the  library  to
  88        determine  whether  the parameter is a wide character or a
  89        request.
  90
  91
  92 </PRE>
  93 <H3><a name="h3-Form-driver-requests">Form-driver requests</a></H3><PRE>
  94        The form driver requests are as follows:
  95
  96        <EM>Name</EM>               <EM>Description</EM>
  97        -------------------------------------------------------------------------
  98        REQ_BEG_FIELD      Move to the beginning of the field.
  99        REQ_BEG_LINE       Move to the beginning of the line.
 100        REQ_CLR_EOF        Clear to end of field from cursor.
 101        REQ_CLR_EOL        Clear to end of line from cursor.
 102        REQ_CLR_FIELD      Clear the entire field.
 103        REQ_DEL_CHAR       Delete character at the cursor.
 104        REQ_DEL_LINE       Delete line at the cursor.
 105        REQ_DEL_PREV       Delete character before the cursor.
 106        REQ_DEL_WORD       Delete blank-delimited word at the cursor.
 107        REQ_DOWN_CHAR      Move down in the field.
 108        REQ_DOWN_FIELD     Move down to a field.
 109        REQ_END_FIELD      Move to the end of the field.
 110        REQ_END_LINE       Move to the end of the line.
 111        REQ_FIRST_FIELD    Move to the first field.
 112        REQ_FIRST_PAGE     Move to the first page.
 113        REQ_INS_CHAR       Insert a blank at the cursor.
 114        REQ_INS_LINE       Insert a blank line at the cursor.
 115        REQ_INS_MODE       Enter insert mode.
 116        REQ_LAST_FIELD     Move to the last field.
 117        REQ_LAST_PAGE      Move to the last field.
 118        REQ_LEFT_CHAR      Move left in the field.
 119        REQ_LEFT_FIELD     Move left to a field.
 120
 121        REQ_NEW_LINE       Insert or overlay a new line.
 122        REQ_NEXT_CHAR      Move to the next char.
 123        REQ_NEXT_CHOICE    Display next field choice.
 124        REQ_NEXT_FIELD     Move to the next field.
 125        REQ_NEXT_LINE      Move to the next line.
 126        REQ_NEXT_PAGE      Move to the next page.
 127        REQ_NEXT_PAGE      Move to the next page.
 128        REQ_NEXT_WORD      Move to the next word.
 129        REQ_OVL_MODE       Enter overlay mode.
 130        REQ_PREV_CHAR      Move to the previous char.
 131        REQ_PREV_CHOICE    Display previous field choice.
 132        REQ_PREV_FIELD     Move to the previous field.
 133        REQ_PREV_LINE      Move to the previous line.
 134        REQ_PREV_PAGE      Move to the previous page.
 135        REQ_PREV_WORD      Move to the previous word.
 136        REQ_RIGHT_CHAR     Move right in the field.
 137        REQ_RIGHT_FIELD    Move right to a field.
 138        REQ_SCR_BCHAR      Scroll the field backward a character.
 139        REQ_SCR_BHPAGE     Scroll the field backward half a page.
 140        REQ_SCR_BLINE      Scroll the field backward a line.
 141        REQ_SCR_BPAGE      Scroll the field backward a page.
 142        REQ_SCR_FCHAR      Scroll the field forward a character.
 143        REQ_SCR_FHPAGE     Scroll the field forward half a page.
 144        REQ_SCR_FLINE      Scroll the field forward a line.
 145        REQ_SCR_FPAGE      Scroll the field forward a page.
 146        REQ_SCR_HBHALF     Horizontal scroll the field backward half a line.
 147        REQ_SCR_HBLINE     Horizontal scroll the field backward a line.
 148        REQ_SCR_HFHALF     Horizontal scroll the field forward half a line.
 149        REQ_SCR_HFLINE     Horizontal scroll the field forward a line.
 150        REQ_SFIRST_FIELD   Move to the sorted first field.
 151        REQ_SLAST_FIELD    Move to the sorted last field.
 152        REQ_SNEXT_FIELD    Move to the sorted next field.
 153        REQ_SPREV_FIELD    Move to the sorted previous field.
 154        REQ_UP_CHAR        Move up in the field.
 155        REQ_UP_FIELD       Move up to a field.
 156        REQ_VALIDATION     Validate field.
 157
 158        If the second  argument  is  a  printable  character,  the
 159        driver  places  it  in the current position in the current
 160        field.  If it is one of the forms requests  listed  above,
 161        that request is executed.
 162
 163
 164 </PRE>
 165 <H3><a name="h3-Mouse-handling">Mouse handling</a></H3><PRE>
 166        If  the  second argument is the KEY_MOUSE special key, the
 167        associated mouse event is translated into one of the above
 168        pre-defined  requests.   Currently only clicks in the user
 169        window (e.g., inside the form display area or the  decora-
 170        tion window) are handled.
 171
 172        If you click above the display region of the form:
 173
 174           a REQ_PREV_FIELD is generated for a single click,
 175
 176           a REQ_PREV_PAGE is generated for a double-click and
 177
 178           a REQ_FIRST_FIELD is generated for a triple-click.
 179
 180        If you click below the display region of the form:
 181
 182           a REQ_NEXT_FIELD is generated for a single click,
 183
 184           a REQ_NEXT_PAGE is generated for a double-click and
 185
 186           a REQ_LAST_FIELD is generated for a triple-click.
 187
 188        If  you  click  at an field inside the display area of the
 189        form:
 190
 191           <STRONG>o</STRONG>   the form cursor is positioned to that field.
 192
 193           <STRONG>o</STRONG>   If you double-click a field,  the  form  cursor  is
 194               positioned  to  that field and <STRONG>E_UNKNOWN_COMMAND</STRONG> is
 195               returned.  This return value makes sense, because a
 196               double  click  usually means that an field-specific
 197               action should be returned.  It is exactly the  pur-
 198               pose  of this return value to signal that an appli-
 199               cation specific command should be executed.
 200
 201           <STRONG>o</STRONG>   If  a  translation  into  a   request   was   done,
 202               <STRONG>form_driver</STRONG> returns the result of this request.
 203
 204        If  you clicked outside the user window or the mouse event
 205        could  not  be  translated  into   a   form   request   an
 206        <STRONG>E_REQUEST_DENIED</STRONG> is returned.
 207
 208
 209 </PRE>
 210 <H3><a name="h3-Application-defined-commands">Application-defined commands</a></H3><PRE>
 211        If the second argument is neither printable nor one of the
 212        above pre-defined form requests, the driver assumes it  is
 213        an application-specific command and returns <STRONG>E_UNKNOWN_COM-</STRONG>
 214        <STRONG>MAND</STRONG>.  Application-defined commands should be defined rel-
 215        ative  to  <STRONG>MAX_COMMAND</STRONG>,  the  maximum  value of these pre-
 216        defined requests.
 217
 218
 219 </PRE>
 220 <H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
 221        <STRONG>form_driver</STRONG> returns one of the following error codes:
 222
 223        <STRONG>E_OK</STRONG> The routine succeeded.
 224
 225        <STRONG>E_BAD_ARGUMENT</STRONG>
 226             Routine detected an incorrect or  out-of-range  argu-
 227             ment.
 228
 229        <STRONG>E_BAD_STATE</STRONG>
 230             Routine was called from an initialization or termina-
 231             tion function.
 232
 233        <STRONG>E_NOT_POSTED</STRONG>
 234             The form has not been posted.
 235
 236        <STRONG>E_INVALID_FIELD</STRONG>
 237             Contents of field is invalid.
 238
 239        <STRONG>E_REQUEST_DENIED</STRONG>
 240             The form driver could not process the request.
 241
 242        <STRONG>E_SYSTEM_ERROR</STRONG>
 243             System error occurred (see <STRONG>errno</STRONG>).
 244
 245        <STRONG>E_UNKNOWN_COMMAND</STRONG>
 246             The form driver code saw an unknown request code.
 247
 248
 249 </PRE>
 250 <H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
 251        <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="form.3x.html">form(3x)</A></STRONG>, <STRONG><A HREF="form_variables.3x.html">form_variables(3x)</A></STRONG>, <STRONG><A HREF="curs_getch.3x.html">curs_getch(3x)</A></STRONG>.
 252
 253
 254 </PRE>
 255 <H2><a name="h2-NOTES">NOTES</a></H2><PRE>
 256        The header file <STRONG>&lt;form.h&gt;</STRONG> automatically includes the header
 257        files <STRONG>&lt;curses.h&gt;</STRONG>.
 258
 259
 260 </PRE>
 261 <H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
 262        These  routines  emulate the System V forms library.  They
 263        were not supported on Version 7 or BSD versions.
 264
 265
 266 </PRE>
 267 <H2><a name="h2-AUTHORS">AUTHORS</a></H2><PRE>
 268        Juergen Pfeifer.  Manual  pages  and  adaptation  for  new
 269        curses by Eric S. Raymond.
 270
 271
 272
 273                                                         <STRONG><A HREF="form_driver.3x.html">form_driver(3x)</A></STRONG>
 274 </PRE>
 275 <div class="nav">
 276 <ul>
 277 <li><a href="#h2-NAME">NAME</a></li>
 278 <li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
 279 <li><a href="#h2-DESCRIPTION">DESCRIPTION</a>
 280 <ul>
 281 <li><a href="#h3-form_driver">form_driver</a></li>
 282 <li><a href="#h3-form_driver_w">form_driver_w</a></li>
 283 <li><a href="#h3-Form-driver-requests">Form-driver requests</a></li>
 284 <li><a href="#h3-Mouse-handling">Mouse handling</a></li>
 285 <li><a href="#h3-Application-defined-commands">Application-defined commands</a></li>
 286 </ul>
 287 </li>
 288 <li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
 289 <li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
 290 <li><a href="#h2-NOTES">NOTES</a></li>
 291 <li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
 292 <li><a href="#h2-AUTHORS">AUTHORS</a></li>
 293 </ul>
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