+ Once a menu has been posted (displayed), you should funnel input events
+ to it through menu_driver. This routine has three major input cases:
- o The input is a form navigation request. Navigation
- request codes are constants defined in <form.h>, which
- are distinct from the key- and character codes
- returned by wgetch.
+ o The input is a form navigation request. Navigation request codes
+ are constants defined in <form.h>, which are distinct from the key-
+ and character codes returned by wgetch(3x).
- o The input is a printable character. Printable charac-
- ters (which must be positive, less than 256) are
- checked according to the program's locale settings.
+ o The input is a printable character. Printable characters (which
+ must be positive, less than 256) are checked according to the pro-
+ gram's locale settings.
- o The input is the KEY_MOUSE special key associated with
- an mouse event.
+ o The input is the KEY_MOUSE special key associated with an mouse
+ event.
The menu driver requests are as follows:
@@ -120,8 +114,7 @@
Clear the menu pattern buffer.
REQ_BACK_PATTERN
- Delete the previous character from the pattern buf-
- fer.
+ Delete the previous character from the pattern buffer.
REQ_NEXT_MATCH
Move to the next item matching the pattern match.
@@ -129,23 +122,20 @@
REQ_PREV_MATCH
Move to the previous item matching the pattern match.
- If the second argument is a printable character, the code
- appends it to the pattern buffer and attempts to move to
- the next item matching the new pattern. If there is no
- such match, menu_driver returns E_NO_MATCH and deletes the
- appended character from the buffer.
+ If the second argument is a printable character, the code appends it to
+ the pattern buffer and attempts to move to the next item matching the
+ new pattern. If there is no such match, menu_driver returns E_NO_MATCH
+ and deletes the appended character from the buffer.
- If the second argument is one of the above pre-defined
- requests, the corresponding action is performed.
+ If the second argument is one of the above pre-defined requests, the
+ corresponding action is performed.
-
- If the second argument is the KEY_MOUSE special key, the
- associated mouse event is translated into one of the above
- pre-defined requests. Currently only clicks in the user
- window (e.g., inside the menu display area or the decora-
- tion window) are handled.
+
+ If the second argument is the KEY_MOUSE special key, the associated
+ mouse event is translated into one of the above pre-defined requests.
+ Currently only clicks in the user window (e.g., inside the menu display
+ area or the decoration window) are handled.
If you click above the display region of the menu:
@@ -163,53 +153,44 @@
o a REQ_LAST_ITEM is generated for a triple-click.
- If you click at an item inside the display area of the
- menu:
+ If you click at an item inside the display area of the menu:
o the menu cursor is positioned to that item.
- o If you double-click an item a REQ_TOGGLE_ITEM is gen-
- erated and E_UNKNOWN_COMMAND is returned. This return
- value makes sense, because a double click usually
- means that an item-specific action should be returned.
- It is exactly the purpose of this return value to sig-
- nal that an application specific command should be
- executed.
+ o If you double-click an item a REQ_TOGGLE_ITEM is generated and
+ E_UNKNOWN_COMMAND is returned. This return value makes sense,
+ because a double click usually means that an item-specific action
+ should be returned. It is exactly the purpose of this return value
+ to signal that an application specific command should be executed.
- o If a translation into a request was done, menu_driver
- returns the result of this request.
+ o If a translation into a request was done, menu_driver returns the
+ result of this request.
- If you clicked outside the user window or the mouse event
- could not be translated into a menu request an
- E_REQUEST_DENIED is returned.
+ If you clicked outside the user window or the mouse event could not be
+ translated into a menu request an E_REQUEST_DENIED is returned.
-
- If the second argument is neither printable nor one of the
- above pre-defined menu requests or KEY_MOUSE, the drive
- assumes it is an application-specific command and returns
- E_UNKNOWN_COMMAND. Application-defined commands should be
- defined relative to MAX_COMMAND, the maximum value of
- these pre-defined requests.
+
+ If the second argument is neither printable nor one of the above pre-
+ defined menu requests or KEY_MOUSE, the drive assumes it is an applica-
+ tion-specific command and returns E_UNKNOWN_COMMAND. Application-
+ defined commands should be defined relative to MAX_COMMAND, the maximum
+ value of these pre-defined requests.
-
menu_driver return one of the following error codes:
E_OK The routine succeeded.
E_SYSTEM_ERROR
- System error occurred (see errno).
+ System error occurred (see errno(3)).
E_BAD_ARGUMENT
- Routine detected an incorrect or out-of-range argu-
- ment.
+ Routine detected an incorrect or out-of-range argument.
E_BAD_STATE
- Routine was called from an initialization or termina-
- tion function.
+ Routine was called from an initialization or termination function.
E_NOT_POSTED
The menu has not been posted.
@@ -224,32 +205,28 @@
The menu driver could not process the request.
-
- These routines emulate the System V menu library. They
- were not supported on Version 7 or BSD versions. The sup-
- port for mouse events is ncurses specific.
+
+ These routines emulate the System V menu library. They were not sup-
+ ported on Version 7 or BSD versions. The support for mouse events is
+ ncurses specific.
-