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30 * @Id: form_driver.3x,v 1.33 2020/02/02 23:34:34 tom Exp @
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42 <H1 class="no-header">form_driver 3x</H1>
44 <STRONG><A HREF="form_driver.3x.html">form_driver(3x)</A></STRONG> <STRONG><A HREF="form_driver.3x.html">form_driver(3x)</A></STRONG>
49 </PRE><H2><a name="h2-NAME">NAME</a></H2><PRE>
50 <STRONG>form_driver</STRONG>, <STRONG>form_driver_w</STRONG> - command-processing loop of the form system
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 input events
63 to it through <STRONG>form_driver</STRONG>. This routine has three major input cases:
65 <STRONG>o</STRONG> The input is a form navigation request. Navigation request codes
66 are constants defined in <STRONG><form.h></STRONG>, which are distinct from the key-
67 and character codes returned by <STRONG><A HREF="curs_getch.3x.html">wgetch(3x)</A></STRONG>.
69 <STRONG>o</STRONG> The input is a printable character. Printable characters (which
70 must be positive, less than 256) are checked according to the pro-
71 gram's locale settings.
73 <STRONG>o</STRONG> The input is the KEY_MOUSE special key associated with an mouse
77 </PRE><H3><a name="h3-form_driver_w">form_driver_w</a></H3><PRE>
78 This extension simplifies the use of the forms library using wide char-
79 acters. The input is either a key code (a request) or a wide character
80 returned by <STRONG><A HREF="curs_get_wch.3x.html">get_wch(3x)</A></STRONG>. The type must be passed as well, to enable
81 the library to determine whether the parameter is a wide character or a
85 </PRE><H3><a name="h3-Form-driver-requests">Form-driver requests</a></H3><PRE>
86 The form driver requests are as follows:
88 <EM>Name</EM> <EM>Description</EM>
89 ---------------------------------------------------------------------
90 REQ_BEG_FIELD Move to the beginning of the field.
91 REQ_BEG_LINE Move to the beginning of the line.
92 REQ_CLR_EOF Clear to end of field from cursor.
93 REQ_CLR_EOL Clear to end of line from cursor.
94 REQ_CLR_FIELD Clear the entire field.
95 REQ_DEL_CHAR Delete character at the cursor.
96 REQ_DEL_LINE Delete line at the cursor.
97 REQ_DEL_PREV Delete character before the cursor.
98 REQ_DEL_WORD Delete blank-delimited word at the cursor.
99 REQ_DOWN_CHAR Move down in the field.
100 REQ_DOWN_FIELD Move down to a field.
101 REQ_END_FIELD Move to the end of the field.
102 REQ_END_LINE Move to the end of the line.
103 REQ_FIRST_FIELD Move to the first field.
104 REQ_FIRST_PAGE Move to the first page.
105 REQ_INS_CHAR Insert a blank at the cursor.
106 REQ_INS_LINE Insert a blank line at the cursor.
107 REQ_INS_MODE Enter insert mode.
108 REQ_LAST_FIELD Move to the last field.
109 REQ_LAST_PAGE Move to the last field.
110 REQ_LEFT_CHAR Move left in the field.
111 REQ_LEFT_FIELD Move left to a field.
112 REQ_NEW_LINE Insert or overlay a new line.
113 REQ_NEXT_CHAR Move to the next char.
114 REQ_NEXT_CHOICE Display next field choice.
116 REQ_NEXT_FIELD Move to the next field.
117 REQ_NEXT_LINE Move to the next line.
118 REQ_NEXT_PAGE Move to the next page.
119 REQ_NEXT_PAGE Move to the next page.
120 REQ_NEXT_WORD Move to the next word.
121 REQ_OVL_MODE Enter overlay mode.
122 REQ_PREV_CHAR Move to the previous char.
123 REQ_PREV_CHOICE Display previous field choice.
124 REQ_PREV_FIELD Move to the previous field.
125 REQ_PREV_LINE Move to the previous line.
126 REQ_PREV_PAGE Move to the previous page.
127 REQ_PREV_WORD Move to the previous word.
128 REQ_RIGHT_CHAR Move right in the field.
129 REQ_RIGHT_FIELD Move right to a field.
130 REQ_SCR_BCHAR Scroll the field backward a character.
131 REQ_SCR_BHPAGE Scroll the field backward half a page.
132 REQ_SCR_BLINE Scroll the field backward a line.
133 REQ_SCR_BPAGE Scroll the field backward a page.
134 REQ_SCR_FCHAR Scroll the field forward a character.
135 REQ_SCR_FHPAGE Scroll the field forward half a page.
136 REQ_SCR_FLINE Scroll the field forward a line.
137 REQ_SCR_FPAGE Scroll the field forward a page.
138 REQ_SCR_HBHALF Horizontal scroll the field backward half a line.
139 REQ_SCR_HBLINE Horizontal scroll the field backward a line.
140 REQ_SCR_HFHALF Horizontal scroll the field forward half a line.
141 REQ_SCR_HFLINE Horizontal scroll the field forward a line.
142 REQ_SFIRST_FIELD Move to the sorted first field.
143 REQ_SLAST_FIELD Move to the sorted last field.
144 REQ_SNEXT_FIELD Move to the sorted next field.
145 REQ_SPREV_FIELD Move to the sorted previous field.
146 REQ_UP_CHAR Move up in the field.
147 REQ_UP_FIELD Move up to a field.
148 REQ_VALIDATION Validate field.
150 If the second argument is a printable character, the driver places it
151 in the current position in the current field. If it is one of the
152 forms requests listed above, that request is executed.
155 </PRE><H3><a name="h3-Field-validation">Field validation</a></H3><PRE>
156 The form library makes updates to the window associated with form
157 fields rather than directly to the field buffers.
159 The form driver provides low-level control over updates to the form
160 fields. The form driver also provides for validating modified fields
161 to ensure that the contents meet whatever constraints an application
162 may attach using <STRONG>set_field_type</STRONG>.
164 You can validate a field without making any changes to it using
165 <STRONG>REQ_VALIDATION</STRONG>. The form driver also validates a field in these cases:
167 <STRONG>o</STRONG> a call to <STRONG>set_current_field</STRONG> attempts to move to a different field.
169 <STRONG>o</STRONG> a call to <STRONG>set_current_page</STRONG> attempts to move to a different page of
172 <STRONG>o</STRONG> a request attempts to move to a different field.
174 <STRONG>o</STRONG> a request attempts to move to a different page of the form.
176 In each case, the move fails if the field is invalid.
178 If the modified field is valid, the form driver copies the modified
179 data from the window associated with the field to the field buffer.
182 </PRE><H3><a name="h3-Mouse-handling">Mouse handling</a></H3><PRE>
183 If the second argument is the KEY_MOUSE special key, the associated
184 mouse event is translated into one of the above pre-defined requests.
185 Currently only clicks in the user window (e.g., inside the form display
186 area or the decoration window) are handled.
188 If you click above the display region of the form:
190 a REQ_PREV_FIELD is generated for a single click,
192 a REQ_PREV_PAGE is generated for a double-click and
194 a REQ_FIRST_FIELD is generated for a triple-click.
196 If you click below the display region of the form:
198 a REQ_NEXT_FIELD is generated for a single click,
200 a REQ_NEXT_PAGE is generated for a double-click and
202 a REQ_LAST_FIELD is generated for a triple-click.
204 If you click at an field inside the display area of the form:
206 <STRONG>o</STRONG> the form cursor is positioned to that field.
208 <STRONG>o</STRONG> If you double-click a field, the form cursor is positioned to
209 that field and <STRONG>E_UNKNOWN_COMMAND</STRONG> is returned. This return value
210 makes sense, because a double click usually means that an field-
211 specific action should be returned. It is exactly the purpose
212 of this return value to signal that an application specific com-
213 mand should be executed.
215 <STRONG>o</STRONG> If a translation into a request was done, <STRONG>form_driver</STRONG> returns
216 the result of this request.
218 If you clicked outside the user window or the mouse event could not be
219 translated into a form request an <STRONG>E_REQUEST_DENIED</STRONG> is returned.
222 </PRE><H3><a name="h3-Application-defined-commands">Application-defined commands</a></H3><PRE>
223 If the second argument is neither printable nor one of the above pre-
224 defined form requests, the driver assumes it is an application-specific
225 command and returns <STRONG>E_UNKNOWN_COMMAND</STRONG>. Application-defined commands
226 should be defined relative to <STRONG>MAX_COMMAND</STRONG>, the maximum value of these
227 pre-defined requests.
230 </PRE><H2><a name="h2-RETURN-VALUE">RETURN VALUE</a></H2><PRE>
231 <STRONG>form_driver</STRONG> returns one of the following error codes:
233 <STRONG>E_OK</STRONG> The routine succeeded.
235 <STRONG>E_BAD_ARGUMENT</STRONG>
236 Routine detected an incorrect or out-of-range argument.
238 <STRONG>E_BAD_STATE</STRONG>
239 Routine was called from an initialization or termination function.
241 <STRONG>E_NOT_POSTED</STRONG>
242 The form has not been posted.
244 <STRONG>E_INVALID_FIELD</STRONG>
245 Contents of field is invalid.
247 <STRONG>E_NOT_CONNECTED</STRONG>
248 No fields are connected to the form.
250 <STRONG>E_REQUEST_DENIED</STRONG>
251 The form driver could not process the request.
253 <STRONG>E_SYSTEM_ERROR</STRONG>
254 System error occurred (see <STRONG>errno(3)</STRONG>).
256 <STRONG>E_UNKNOWN_COMMAND</STRONG>
257 The form driver code saw an unknown request code.
260 </PRE><H2><a name="h2-SEE-ALSO">SEE ALSO</a></H2><PRE>
261 <STRONG><A HREF="ncurses.3x.html">curses(3x)</A></STRONG>, <STRONG><A HREF="form.3x.html">form(3x)</A></STRONG>, <STRONG><A HREF="form_field_buffer.3x.html">form_field_buffer(3x)</A></STRONG>, <STRONG><A HREF="form_field_validation.3x.html">form_field_validation(3x)</A></STRONG>,
262 <STRONG><A HREF="form_fieldtype.3x.html">form_fieldtype(3x)</A></STRONG>, <STRONG><A HREF="form_variables.3x.html">form_variables(3x)</A></STRONG>, <STRONG><A HREF="curs_getch.3x.html">getch(3x)</A></STRONG>.
265 </PRE><H2><a name="h2-NOTES">NOTES</a></H2><PRE>
266 The header file <STRONG><form.h></STRONG> automatically includes the header files
267 <STRONG><curses.h></STRONG>.
270 </PRE><H2><a name="h2-PORTABILITY">PORTABILITY</a></H2><PRE>
271 These routines emulate the System V forms library. They were not sup-
272 ported on Version 7 or BSD versions.
275 </PRE><H2><a name="h2-AUTHORS">AUTHORS</a></H2><PRE>
276 Juergen Pfeifer. Manual pages and adaptation for new curses by Eric S.
281 <STRONG><A HREF="form_driver.3x.html">form_driver(3x)</A></STRONG>
285 <li><a href="#h2-NAME">NAME</a></li>
286 <li><a href="#h2-SYNOPSIS">SYNOPSIS</a></li>
287 <li><a href="#h2-DESCRIPTION">DESCRIPTION</a>
289 <li><a href="#h3-form_driver">form_driver</a></li>
290 <li><a href="#h3-form_driver_w">form_driver_w</a></li>
291 <li><a href="#h3-Form-driver-requests">Form-driver requests</a></li>
292 <li><a href="#h3-Field-validation">Field validation</a></li>
293 <li><a href="#h3-Mouse-handling">Mouse handling</a></li>
294 <li><a href="#h3-Application-defined-commands">Application-defined commands</a></li>
297 <li><a href="#h2-RETURN-VALUE">RETURN VALUE</a></li>
298 <li><a href="#h2-SEE-ALSO">SEE ALSO</a></li>
299 <li><a href="#h2-NOTES">NOTES</a></li>
300 <li><a href="#h2-PORTABILITY">PORTABILITY</a></li>
301 <li><a href="#h2-AUTHORS">AUTHORS</a></li>