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29 .\" $Id: menu_driver.3x,v 1.24 2018/07/28 22:08:59 tom Exp $
36 \fBmenu_driver\fR \- command-processing loop of the menu system
38 \fB#include <menu.h>\fR
40 int menu_driver(MENU *menu, int c);
43 Once a menu has been posted (displayed), you should funnel input events to it
44 through \fBmenu_driver\fR. This routine has three major input cases:
46 The input is a form navigation request.
47 Navigation request codes are constants defined in \fB<form.h>\fP,
48 which are distinct from the key- and character codes
49 returned by \fBwgetch\fP(3X).
51 The input is a printable character.
52 Printable characters (which must be positive, less than 256) are
53 checked according to the program's locale settings.
55 The input is the KEY_MOUSE special key associated with an mouse event.
57 The menu driver requests are as follows:
63 Move right to an item.
84 Move to the first item.
87 Move to the last item.
90 Move to the next item.
93 Move to the previous item.
96 Select/deselect an item.
99 Clear the menu pattern buffer.
102 Delete the previous character from the pattern buffer.
105 Move to the next item matching the pattern match.
108 Move to the previous item matching the pattern match.
110 If the second argument is a printable character, the code appends
111 it to the pattern buffer and attempts to move to the next item matching
113 If there is no such match, \fBmenu_driver\fR returns
114 \fBE_NO_MATCH\fR and deletes the appended character from the buffer.
116 If the second argument is one of the above pre-defined requests, the
117 corresponding action is performed.
120 If the second argument is the KEY_MOUSE special key, the associated
121 mouse event is translated into one of the above pre-defined requests.
122 Currently only clicks in the user window (e.g., inside the menu display
123 area or the decoration window) are handled.
125 If you click above the display region of the menu:
127 a REQ_SCR_ULINE is generated for a single click,
129 a REQ_SCR_UPAGE is generated for a double-click and
131 a REQ_FIRST_ITEM is generated for a triple-click.
133 If you click below the display region of the menu:
135 a REQ_SCR_DLINE is generated for a single click,
137 a REQ_SCR_DPAGE is generated for a double-click and
139 a REQ_LAST_ITEM is generated for a triple-click.
141 If you click at an item inside the display area of the menu:
143 the menu cursor is positioned to that item.
145 If you double-click an item a REQ_TOGGLE_ITEM
146 is generated and \fBE_UNKNOWN_COMMAND\fR is returned.
147 This return value makes sense,
148 because a double click usually means that an item-specific action should
150 It is exactly the purpose of this return value to signal that an
151 application specific command should be executed.
154 into a request was done, \fBmenu_driver\fR returns the result of this request.
156 If you clicked outside the user window
157 or the mouse event could not be translated
158 into a menu request an \fBE_REQUEST_DENIED\fR is returned.
159 .SS APPLICATION-DEFINED COMMANDS
161 If the second argument is neither printable nor one of the above
162 pre-defined menu requests or KEY_MOUSE,
163 the drive assumes it is an application-specific
164 command and returns \fBE_UNKNOWN_COMMAND\fR. Application-defined commands
165 should be defined relative to \fBMAX_COMMAND\fR, the maximum value of these
166 pre-defined requests.
168 \fBmenu_driver\fR return one of the following error codes:
171 The routine succeeded.
174 System error occurred (see \fBerrno\fR).
177 Routine detected an incorrect or out-of-range argument.
180 Routine was called from an initialization or termination function.
183 The menu has not been posted.
186 The menu driver code saw an unknown request code.
189 Character failed to match.
192 The menu driver could not process the request.
198 The header file \fB<menu.h>\fR automatically includes the header files
201 These routines emulate the System V menu library.
202 They were not supported on
203 Version 7 or BSD versions.
204 The support for mouse events is ncurses specific.
207 Manual pages and adaptation for new curses by Eric S. Raymond.