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29 * @Id: form_driver.3x,v 1.25 2015/12/05 21:06:26 tom Exp @
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41 <H1 class="no-header">form_driver 3x</H1>
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>
48 </PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
49 <STRONG>form_driver</STRONG>, <STRONG>form_driver_w</STRONG> - command-processing loop of
53 </PRE><H2><a name="h2-SYNOPSIS">SYNOPSIS</a></H2><PRE>
54 <STRONG>#include</STRONG> <STRONG><form.h></STRONG>
55 <STRONG>int</STRONG> <STRONG>form_driver(FORM</STRONG> <STRONG>*</STRONG><EM>form</EM><STRONG>,</STRONG> <STRONG>int</STRONG> <EM>c</EM><STRONG>);</STRONG>
56 <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>
59 </PRE><H2><a name="h2-DESCRIPTION">DESCRIPTION</a></H2><PRE>
61 </PRE><H3><a name="h3-form_driver">form_driver</a></H3><PRE>
62 Once a form has been posted (displayed), you should funnel
63 input events to it through <STRONG>form_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><A HREF="wgetch.3x.html">wgetch(3x)</A></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
79 </PRE><H3><a name="h3-form_driver_w">form_driver_w</a></H3><PRE>
80 This extension simplifies the use of the forms library
81 using wide characters. The input is either a key code (a
82 request) or a wide character returned by <STRONG><A HREF="get_wch.3x.html">get_wch(3x)</A></STRONG>. The
83 type must be passed as well, to enable the library to
84 determine whether the parameter is a wide character or a
88 </PRE><H3><a name="h3-Form-driver-requests">Form-driver requests</a></H3><PRE>
89 The form driver requests are as follows:
91 <EM>Name</EM> <EM>Description</EM>
92 -------------------------------------------------------------------------
93 REQ_BEG_FIELD Move to the beginning of the field.
94 REQ_BEG_LINE Move to the beginning of the line.
95 REQ_CLR_EOF Clear to end of field from cursor.
96 REQ_CLR_EOL Clear to end of line from cursor.
97 REQ_CLR_FIELD Clear the entire field.
98 REQ_DEL_CHAR Delete character at the cursor.
99 REQ_DEL_LINE Delete line at the cursor.
100 REQ_DEL_PREV Delete character before the cursor.
101 REQ_DEL_WORD Delete blank-delimited word at the cursor.
102 REQ_DOWN_CHAR Move down in the field.
103 REQ_DOWN_FIELD Move down to a field.
104 REQ_END_FIELD Move to the end of the field.
105 REQ_END_LINE Move to the end of the line.
106 REQ_FIRST_FIELD Move to the first field.
107 REQ_FIRST_PAGE Move to the first page.
108 REQ_INS_CHAR Insert a blank at the cursor.
109 REQ_INS_LINE Insert a blank line at the cursor.
110 REQ_INS_MODE Enter insert mode.
111 REQ_LAST_FIELD Move to the last field.
112 REQ_LAST_PAGE Move to the last field.
113 REQ_LEFT_CHAR Move left in the field.
115 REQ_LEFT_FIELD Move left to a field.
116 REQ_NEW_LINE Insert or overlay a new line.
117 REQ_NEXT_CHAR Move to the next char.
118 REQ_NEXT_CHOICE Display next field choice.
119 REQ_NEXT_FIELD Move to the next field.
120 REQ_NEXT_LINE Move to the next line.
121 REQ_NEXT_PAGE Move to the next page.
122 REQ_NEXT_PAGE Move to the next page.
123 REQ_NEXT_WORD Move to the next word.
124 REQ_OVL_MODE Enter overlay mode.
125 REQ_PREV_CHAR Move to the previous char.
126 REQ_PREV_CHOICE Display previous field choice.
127 REQ_PREV_FIELD Move to the previous field.
128 REQ_PREV_LINE Move to the previous line.
129 REQ_PREV_PAGE Move to the previous page.
130 REQ_PREV_WORD Move to the previous word.
131 REQ_RIGHT_CHAR Move right in the field.
132 REQ_RIGHT_FIELD Move right to a field.
133 REQ_SCR_BCHAR Scroll the field backward a character.
134 REQ_SCR_BHPAGE Scroll the field backward half a page.
135 REQ_SCR_BLINE Scroll the field backward a line.
136 REQ_SCR_BPAGE Scroll the field backward a page.
137 REQ_SCR_FCHAR Scroll the field forward a character.
138 REQ_SCR_FHPAGE Scroll the field forward half a page.
139 REQ_SCR_FLINE Scroll the field forward a line.
140 REQ_SCR_FPAGE Scroll the field forward a page.
141 REQ_SCR_HBHALF Horizontal scroll the field backward half a line.
142 REQ_SCR_HBLINE Horizontal scroll the field backward a line.
143 REQ_SCR_HFHALF Horizontal scroll the field forward half a line.
144 REQ_SCR_HFLINE Horizontal scroll the field forward a line.
145 REQ_SFIRST_FIELD Move to the sorted first field.
146 REQ_SLAST_FIELD Move to the sorted last field.
147 REQ_SNEXT_FIELD Move to the sorted next field.
148 REQ_SPREV_FIELD Move to the sorted previous field.
149 REQ_UP_CHAR Move up in the field.
150 REQ_UP_FIELD Move up to a field.
151 REQ_VALIDATION Validate field.
153 If the second argument is a printable character, the
154 driver places it in the current position in the current
155 field. If it is one of the forms requests listed above,
156 that request is executed.
159 </PRE><H3><a name="h3-Mouse-handling">Mouse handling</a></H3><PRE>
160 If the second argument is the KEY_MOUSE special key, the
161 associated mouse event is translated into one of the above
162 pre-defined requests. Currently only clicks in the user
163 window (e.g., inside the form display area or the decora-
164 tion window) are handled.
166 If you click above the display region of the form:
168 a REQ_PREV_FIELD is generated for a single click,
170 a REQ_PREV_PAGE is generated for a double-click and
172 a REQ_FIRST_FIELD is generated for a triple-click.
174 If you click below the display region of the form:
176 a REQ_NEXT_FIELD is generated for a single click,
178 a REQ_NEXT_PAGE is generated for a double-click and
180 a REQ_LAST_FIELD is generated for a triple-click.
182 If you click at an field inside the display area of the
185 <STRONG>o</STRONG> the form cursor is positioned to that field.
187 <STRONG>o</STRONG> If you double-click a field, the form cursor is
188 positioned to that field and <STRONG>E_UNKNOWN_COMMAND</STRONG> is
189 returned. This return value makes sense, because a
190 double click usually means that an field-specific
191 action should be returned. It is exactly the pur-
192 pose of this return value to signal that an appli-
193 cation specific command should be executed.
195 <STRONG>o</STRONG> If a translation into a request was done,
196 <STRONG>form_driver</STRONG> returns the result of this request.
198 If you clicked outside the user window or the mouse event
199 could not be translated into a form request an
200 <STRONG>E_REQUEST_DENIED</STRONG> is returned.
203 </PRE><H3><a name="h3-Application-defined-commands">Application-defined commands</a></H3><PRE>
204 If the second argument is neither printable nor one of the
205 above pre-defined form requests, the driver assumes it is
206 an application-specific command and returns <STRONG>E_UNKNOWN_COM-</STRONG>
207 <STRONG>MAND</STRONG>. Application-defined commands should be defined rel-
208 ative to <STRONG>MAX_COMMAND</STRONG>, the maximum value of these pre-
212 </PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
213 <STRONG>form_driver</STRONG> returns one of the following error codes:
215 <STRONG>E_OK</STRONG> The routine succeeded.
217 <STRONG>E_BAD_ARGUMENT</STRONG>
218 Routine detected an incorrect or out-of-range argu-
221 <STRONG>E_BAD_STATE</STRONG>
222 Routine was called from an initialization or termina-
225 <STRONG>E_NOT_POSTED</STRONG>
226 The form has not been posted.
228 <STRONG>E_INVALID_FIELD</STRONG>
229 Contents of field is invalid.
231 <STRONG>E_REQUEST_DENIED</STRONG>
232 The form driver could not process the request.
234 <STRONG>E_SYSTEM_ERROR</STRONG>
235 System error occurred (see <STRONG>errno</STRONG>).
237 <STRONG>E_UNKNOWN_COMMAND</STRONG>
238 The form driver code saw an unknown request code.
241 </PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
242 <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>.
245 </PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
246 The header file <STRONG><form.h></STRONG> automatically includes the header
247 files <STRONG><curses.h></STRONG>.
250 </PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
251 These routines emulate the System V forms library. They
252 were not supported on Version 7 or BSD versions.
255 </PRE><H2><a name="h2-AUTHORS">AUTHORS</a></H2><PRE>
256 Juergen Pfeifer. Manual pages and adaptation for new
257 curses by Eric S. Raymond.
261 <STRONG><A HREF="form_driver.3x.html">form_driver(3x)</A></STRONG>
265 <li><a href="#h2-NAME">NAME</a></li>
266 <li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
267 <li><a href="#h2-DESCRIPTION">DESCRIPTION</a>
269 <li><a href="#h3-form_driver">form_driver</a></li>
270 <li><a href="#h3-form_driver_w">form_driver_w</a></li>
271 <li><a href="#h3-Form-driver-requests">Form-driver requests</a></li>
272 <li><a href="#h3-Mouse-handling">Mouse handling</a></li>
273 <li><a href="#h3-Application-defined-commands">Application-defined commands</a></li>
276 <li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
277 <li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
278 <li><a href="#h2-NOTES">NOTES</a></li>
279 <li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
280 <li><a href="#h2-AUTHORS">AUTHORS</a></li>