1form_driver(3X) form_driver(3X)
2
6 form_driver - command-processing loop of the form system
7
9 #include <form.h>
10 int form_driver(FORM *form, int c);
11
13 Once a form has been posted (displayed), you should funnel input events
14 to it through form_driver. This routine has three major input cases:
15 · The input is a form navigation request. Navigation request codes
17 are constants defined in <form.h>, which are distinct from the key-
18 and character codes returned by wgetch.
19 · The input is a printable character. Printable characters (which
21 must be positive, less than 256) are checked according to the pro‐
22 gram's locale settings.
23 · The input is the KEY_MOUSE special key associated with an mouse
25 event.
26 The form driver requests are as follows:
28 REQ_NEXT_PAGE
30 Move to the next page.
31 REQ_PREV_PAGE
33 Move to the previous page.
34 REQ_FIRST_PAGE
36 Move to the first page.
37 REQ_LAST_PAGE
39 Move to the last field.
40 REQ_NEXT_FIELD
43 Move to the next field.
44 REQ_PREV_FIELD
46 Move to the previous field.
47 REQ_FIRST_FIELD
49 Move to the first field.
50 REQ_LAST_FIELD
52 Move to the last field.
53 REQ_SNEXT_FIELD
55 Move to the sorted next field.
56 REQ_SPREV_FIELD
58 Move to the sorted previous field.
59 REQ_SFIRST_FIELD
61 Move to the sorted first field.
62 REQ_SLAST_FIELD
64 Move to the sorted last field.
65 REQ_LEFT_FIELD
67 Move left to a field.
68 REQ_RIGHT_FIELD
70 Move right to a field.
71 REQ_UP_FIELD
73 Move up to a field.
74 REQ_DOWN_FIELD
76 Move down to a field.
77 REQ_NEXT_CHAR
80 Move to the next char.
81 REQ_PREV_CHAR
83 Move to the previous char.
84 REQ_NEXT_LINE
86 Move to the next line.
87 REQ_PREV_LINE
89 Move to the previous line.
90 REQ_NEXT_WORD
92 Move to the next word.
93 REQ_PREV_WORD
95 Move to the previous word.
96 REQ_BEG_FIELD
98 Move to the beginning of the field.
99 REQ_END_FIELD
101 Move to the end of the field.
102 REQ_BEG_LINE
104 Move to the beginning of the line.
105 REQ_END_LINE
107 Move to the end of the line.
108 REQ_LEFT_CHAR
110 Move left in the field.
111 REQ_RIGHT_CHAR
113 Move right in the field.
114 REQ_UP_CHAR
116 Move up in the field.
117 REQ_DOWN_CHAR
119 Move down in the field.
120 REQ_NEW_LINE
123 Insert or overlay a new line.
124 REQ_INS_CHAR
126 Insert a blank at the cursor.
127 REQ_INS_LINE
129 Insert a blank line at the cursor.
130 REQ_DEL_CHAR
132 Delete character at the cursor.
133 REQ_DEL_PREV
135 Delete character before the cursor.
136 REQ_DEL_LINE
138 Delete line at the cursor.
139 REQ_DEL_WORD
141 Delete blank-delimited word at the cursor.
142 REQ_CLR_EOL
144 Clear to end of line from cursor.
145 REQ_CLR_EOF
147 Clear to end of field from cursor.
148 REQ_CLR_FIELD
150 Clear the entire field.
151 REQ_OVL_MODE
153 Enter overlay mode.
154 REQ_INS_MODE
156 Enter insert mode.
157 REQ_SCR_FLINE
160 Scroll the field forward a line.
161 REQ_SCR_BLINE
163 Scroll the field backward a line.
164 REQ_SCR_FPAGE
166 Scroll the field forward a page.
167 REQ_SCR_BPAGE
169 Scroll the field backward a page.
170 REQ_SCR_FHPAGE
172 Scroll the field forward half a page.
173 REQ_SCR_BHPAGE
175 Scroll the field backward half a page.
176 REQ_SCR_FCHAR
179 Scroll the field forward a character.
180 REQ_SCR_BCHAR
182 Scroll the field backward a character.
183 REQ_SCR_HFLINE
185 Horizontal scroll the field forward a line.
186 REQ_SCR_HBLINE
188 Horizontal scroll the field backward a line.
189 REQ_SCR_HFHALF
191 Horizontal scroll the field forward half a line.
192 REQ_SCR_HBHALF
194 Horizontal scroll the field backward half a line.
195 REQ_VALIDATION
198 Validate field.
199 REQ_NEXT_CHOICE
201 Display next field choice.
202 REQ_PREV_CHOICE
204 Display previous field choice.
205 If the second argument is a printable character, the driver places it
207 in the current position in the current field. If it is one of the
208 forms requests listed above, that request is executed.
209 MOUSE HANDLING
211 If the second argument is the KEY_MOUSE special key, the associated
212 mouse event is translated into one of the above pre-defined requests.
213 Currently only clicks in the user window (e.g., inside the form display
214 area or the decoration window) are handled.
215 If you click above the display region of the form:
217 a REQ_PREV_FIELD is generated for a single click,
219 a REQ_PREV_PAGE is generated for a double-click and
221 a REQ_FIRST_FIELD is generated for a triple-click.
223 If you click below the display region of the form:
225 a REQ_NEXT_FIELD is generated for a single click,
227 a REQ_NEXT_PAGE is generated for a double-click and
229 a REQ_LAST_FIELD is generated for a triple-click.
231 If you click at an field inside the display area of the form:
233 · the form cursor is positioned to that field.
235 · If you double-click a field, the form cursor is positioned to
237 that field and E_UNKNOWN_COMMAND is returned. This return value
238 makes sense, because a double click usually means that an field-
239 specific action should be returned. It is exactly the purpose
240 of this return value to signal that an application specific com‐
241 mand should be executed.
242 · If a translation into a request was done, form_driver returns
244 the result of this request.
245 If you clicked outside the user window or the mouse event could not be
247 translated into a form request an E_REQUEST_DENIED is returned.
248 APPLICATION-DEFINED COMMANDS
250 If the second argument is neither printable nor one of the above pre-
251 defined form requests, the driver assumes it is an application-specific
252 command and returns E_UNKNOWN_COMMAND. Application-defined commands
253 should be defined relative to MAX_COMMAND, the maximum value of these
254 pre-defined requests.
255
257 form_driver returns one of the following error codes:
258 E_OK The routine succeeded.
260 E_BAD_ARGUMENT
262 Routine detected an incorrect or out-of-range argument.
263 E_BAD_STATE
265 Routine was called from an initialization or termination function.
266 E_NOT_POSTED
268 The form has not been posted.
269 E_INVALID_FIELD
271 Contents of field is invalid.
272 E_REQUEST_DENIED
274 The form driver could not process the request.
275 E_SYSTEM_ERROR
277 System error occurred (see errno).
278 E_UNKNOWN_COMMAND
280 The form driver code saw an unknown request code.
281
283 curses(3X), form(3X), form_variables(3X), getch(3X).
284
286 The header file <form.h> automatically includes the header files
287 <curses.h>.
288
290 These routines emulate the System V forms library. They were not sup‐
291 ported on Version 7 or BSD versions.
292
294 Juergen Pfeifer. Manual pages and adaptation for new curses by Eric S.
295 Raymond.
296 form_driver(3X)