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27.1 Format of Menus | Format of a menu description. | |
27.2 Format of the Menubar | How to specify a menubar. | |
27.3 Menubar | Functions for controlling the menubar. | |
27.4 Modifying Menus | Modifying a menu description. | |
27.6 Pop-Up Menus | Functions for specifying pop-up menus. | |
27.5 Menu Filters | Filter functions for the default menubar. | |
27.7 Menu Accelerators | Using and controlling menu accelerator keys | |
27.8 Buffers Menu | The menu that displays the list of buffers. |
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A menu is described using a menu description, which is a list of menu items, keyword-value pairs, strings, and submenus. The menu description specifies which items are present in the menu, what function each item invokes, and whether the item is selectable or not. Pop-up menus are directly described with a menu description, while menubars are described slightly differently (see below).
The first element of a menu must be a string, which is the name of the
menu. This is the string that will be displayed in the parent menu or
menubar, if any. This string is not displayed in the menu itself,
except in the case of the top level pop-up menu, where there is no
parent. In this case, the string will be displayed at the top of the
menu if popup-menu-titles
is non-nil
.
Immediately following the first element there may optionally be up to four keyword-value pairs, as follows:
:included form
This can be used to control the visibility of a menu. The form is
evaluated and the menu will be omitted if the result is nil
.
:config symbol
This is an efficient shorthand for :included (memq symbol
menubar-configuration)
. See the variable menubar-configuration
.
:filter function
A menu filter is used to sensitize or incrementally create a submenu only when it is selected by the user and not every time the menubar is activated. The filter function is passed the list of menu items in the submenu and must return a list of menu items to be used for the menu. It is called only when the menu is about to be displayed, so other menus may already be displayed. Vile and terrible things will happen if a menu filter function changes the current buffer, window, or frame. It also should not raise, lower, or iconify any frames. Basically, the filter function should have no side-effects.
:accelerator key
A menu accelerator is a keystroke which can be pressed while the menu is visible which will immediately activate the item. key must be a char or the symbol name of a key. See section Menu Accelerators.
The rest of the menu consists of elements as follows:
|
name is a string, the name of the menu item; it is the string to display on the menu. It is filtered through the resource database, so it is possible for resources to override what string is actually displayed.
callback is a form that will be invoked when the menu item is
selected. If the callback of a menu item is a symbol, then it must name
a command. It will be invoked with call-interactively
. If it is
a list, then it is evaluated with eval
.
The valid keywords and their meanings are described below.
Note that for compatibility purposes, the form
|
is also accepted and is equivalent to
|
and the form
|
is accepted and is equivalent to
|
However, these older forms are deprecated and should generally not be used.
A solid horizontal line. This is equivalent to a string consisting solely of hyphens.
A solid double horizontal line.
A dashed horizontal line.
A dashed double horizontal line.
No line (but a small space is left).
A solid horizontal line with a 3-d recessed appearance.
A solid horizontal line with a 3-d pushed-out appearance.
A solid double horizontal line with a 3-d recessed appearance.
A solid double horizontal line with a 3-d pushed-out appearance.
A dashed horizontal line with a 3-d recessed appearance.
A dashed horizontal line with a 3-d pushed-out appearance.
A dashed double horizontal line with a 3-d recessed appearance.
A dashed double horizontal line with a 3-d pushed-out appearance.
The possible keywords are as follows:
form will be evaluated when the menu that this item is a part of
is about to be displayed, and the item will be selectable only if the
result is non-nil
. If the item is unselectable, it will
usually be displayed grayed-out to indicate this.
form will be evaluated when the menu that this item is a part of is about to be displayed, and the resulting string is appended to the displayed name. This provides a convenient way of adding the name of a command’s “argument” to the menu, like ‘Kill Buffer NAME’.
Normally, the keyboard equivalents of commands in menus are displayed
when the “callback” is a symbol. This can be used to specify keys for
more complex menu items. It is passed through
substitute-command-keys
first.
Specifies what kind of object this menu item is. style be one of the symbols
nil
A normal menu item.
toggle
A toggle button.
radio
A radio button.
button
A menubar button.
The only difference between toggle and radio buttons is how they are displayed. But for consistency, a toggle button should be used when there is one option whose value can be turned on or off, and radio buttons should be used when there is a set of mutually exclusive options. When using a group of radio buttons, you should arrange for no more than one to be marked as selected at a time.
Meaningful only when style is toggle
, radio
or
button
. This specifies whether the button will be in the
selected or unselected state. form is evaluated, as for
:active
.
This can be used to control the visibility of a menu item. The form is
evaluated and the menu item is only displayed if the result is
non-nil
. Note that this is different from :active
: If
:active
evaluates to nil
, the item will be displayed
grayed out, while if :included
evaluates to nil
, the item
will be omitted entirely.
This is an efficient shorthand for :included (memq symbol
menubar-configuration)
. See the variable menubar-configuration
.
A menu accelerator is a keystroke which can be pressed while the menu is visible which will immediately activate the item. key must be a char or the symbol name of a key. See section Menu Accelerators.
This variable holds a list of symbols, against which the value of the
:config
tag for each menubar item will be compared. If a menubar
item has a :config
tag, then it is omitted from the menubar if
that tag is not a member of the menubar-configuration
list.
For example:
("File" :filter file-menu-filter ; file-menu-filter is a function that takes ; one argument (a list of menu items) and ; returns a list of menu items [ "Save As..." write-file] [ "Revert Buffer" revert-buffer :active (buffer-modified-p) ] [ "Read Only" toggle-read-only :style toggle :selected buffer-read-only ] ) |
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A menubar is a list of menus, menu items, and strings. The format is similar to that of a menu, except:
nil
, then it is used to represent
the division between the set of menubar items which are flush-left and
those which are flush-right. (Note: this isn’t completely implemented
yet.)
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This variable holds the description of the current menubar. This may be
buffer-local. When the menubar is changed, the function
set-menubar-dirty-flag
has to be called in order for the menubar
to be updated on the screen.
This variable holds the menubar description of the menubar that is
visible at startup. This is the value that current-menubar
has at startup.
This function tells XEmacs that the menubar widget has to be updated. Changes to the menubar will generally not be visible until this function is called.
The following convenience functions are provided for setting the
menubar. They are equivalent to doing the appropriate action to change
current-menubar
, and then calling set-menubar-dirty-flag
.
Note that these functions copy their argument using
copy-sequence
.
This function sets the default menubar to be menubar (see section Format of Menus). This is the menubar that will be visible in buffers that have not defined their own, buffer-local menubar.
This function sets the buffer-local menubar to be menubar. This does not change the menubar in any buffers other than the current one.
Miscellaneous:
If true, the menubar will display keyboard equivalents. If false, only the command names will be displayed.
Function or functions called before a menubar menu is pulled down.
These functions are called with no arguments, and should interrogate and
modify the value of current-menubar
as desired.
The functions on this hook are invoked after the mouse goes down, but
before the menu is mapped, and may be used to activate, deactivate, add,
or delete items from the menus. However, using a filter (with the
:filter
keyword in a menu description) is generally a more
efficient way of accomplishing the same thing, because the filter is
invoked only when the actual menu goes down. With a complex menu,
there can be a quite noticeable and sometimes aggravating delay if
all menu modification is implemented using the activate-menubar-hook
.
See above.
These functions may return the symbol t
to assert that they have
made no changes to the menubar. If any other value is returned, the
menubar is recomputed. If t
is returned but the menubar has been
changed, then the changes may not show up right away. Returning
nil
when the menubar has not changed is not so bad; more
computation will be done, but redisplay of the menubar will still be
performed optimally.
Function or functions to call when a menu or dialog box is dismissed without a selection having been made.
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The following functions are provided to modify the menubar of one of its submenus. Note that these functions modify the menu in-place, rather than copying it and making a new menu.
Some of these functions take a menu path, which is a list of
strings identifying the menu to be modified. For example,
("File")
names the top-level “File” menu. ("File"
"Foo")
names a hypothetical submenu of “File”.
Others take a menu item path, which is similar to a menu path but
also specifies a particular item to be modified. For example,
("File" "Save")
means the menu item called “Save” under the
top-level “File” menu. ("Menu" "Foo" "Item")
means the menu
item called “Item” under the “Foo” submenu of “Menu”.
This function adds a menu to the menubar or one of its submenus. If the named menu exists already, it is changed.
menu-path identifies the menu under which the new menu should be
inserted. If menu-path is nil
, then the menu will be added
to the menubar itself.
submenu is the new menu to add (see section Format of Menus).
before, if provided, is the name of a menu before which this menu should be added, if this menu is not on its parent already. If the menu is already present, it will not be moved.
If in-menu is present use that instead of current-menubar
as the menu to change.
This function adds a menu item to some menu, creating the menu first if necessary. If the named item exists already, it is changed.
menu-path identifies the menu under which the new menu item should be inserted.
menu-leaf is a menubar leaf node (see section Format of Menus).
before, if provided, is the name of a menu before which this item should be added, if this item is not on the menu already. If the item is already present, it will not be moved.
If in-menu is present use that instead of current-menubar
as the menu to change.
This function removes the menu item specified by menu-item-path from the menu hierarchy.
If from-menu is present use that instead of current-menubar
as the menu to change.
This function makes the menu item specified by menu-item-path be selectable.
This function makes the menu item specified by menu-item-path be unselectable.
This function changes the string of the menu item specified by menu-item-path. new-name is the string that the menu item will be printed as from now on.
The following function can be used to search for a particular item in a menubar specification, given a path to the item.
This function searches menubar for the item given by
menu-item-path starting from parent (nil
means start
at the top of menubar). This function returns (item
. parent)
, where parent is the immediate parent of the item
found (a menu description), and item is either a vector, list, or
string, depending on the nature of the menu item.
This function signals an error if the item is not found.
The following deprecated functions are also documented, so that existing code can be understood. You should not use these functions in new code.
This function adds a menu to the menubar or one of its submenus. If the
named menu exists already, it is changed. This is obsolete; use
add-submenu
instead.
menu-path identifies the menu under which the new menu should be
inserted. If menu-path is nil
, then the menu will be added
to the menubar itself.
menu-name is the string naming the menu to be added; menu-items is a list of menu items, strings, and submenus. These two arguments are the same as the first and following elements of a menu description (see section Format of Menus).
before, if provided, is the name of a menu before which this menu should be added, if this menu is not on its parent already. If the menu is already present, it will not be moved.
This function adds a menu item to some menu, creating the menu first if
necessary. If the named item exists already, it is changed. This is
obsolete; use add-menu-button
instead.
menu-path identifies the menu under which the new menu item should be inserted. item-name, function, and enabled-p are the first, second, and third elements of a menu item vector (see section Format of Menus).
before, if provided, is the name of a menu item before which this item should be added, if this item is not on the menu already. If the item is already present, it will not be moved.
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The following filter functions are provided for use in
default-menubar
. You may want to use them in your own menubar
description.
This function changes the arguments and sensitivity of these File menu items:
Has the name of the current buffer appended to it.
Has the name of the current buffer appended to it.
Has the name of the current buffer appended to it.
Has the name of the current buffer appended to it, and is sensitive only when the current buffer is modified.
Has the name of the current buffer appended to it, and is sensitive only when the current buffer has a file.
Sensitive only when there is more than one visible frame.
This function changes the arguments and sensitivity of these Edit menu items:
Sensitive only when XEmacs owns the primary X Selection (if
zmacs-regions
is t
, this is equivalent to saying that
there is a region selected).
Sensitive only when XEmacs owns the primary X Selection.
Sensitive only when XEmacs owns the primary X Selection.
Sensitive only when there is an owner for the X Clipboard Selection.
Sensitive only when there is undo information. While in the midst of an undo, this is changed to ‘Undo More’.
This function sets up the Buffers menu. See section Buffers Menu, for more information.
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This function pops up a menu specified by menu-description, which is a menu description (see section Format of Menus). The menu is displayed at the current mouse position.
This function returns t
if a pop-up menu is up, nil
otherwise.
If true (the default), pop-up menus will have title bars at the top.
Some machinery is provided that attempts to provide a higher-level mechanism onto pop-up menus. This only works if you do not redefine the binding for button3.
This function pops up a menu of global and mode-specific commands. The
menu is computed by combining global-popup-menu
and
mode-popup-menu
. This is the default binding for button3.
You should generally not change this binding.
This holds the global popup menu. This is present in all modes.
(This is nil
by default.)
The mode-specific popup menu. Automatically buffer local.
This is appended to the default items in global-popup-menu
.
This holds the default value of mode-popup-menu
.
Function or functions run before a mode-specific popup menu is made
visible. These functions are called with no arguments, and should
interrogate and modify the value of global-popup-menu
or
mode-popup-menu
as desired. Note: this hook is only run if you
use popup-mode-menu
for activating the global and mode-specific
commands; if you have your own binding for button3, this hook won’t be
run.
The following convenience functions are provided for displaying pop-up menus.
This function pops up a copy of the ‘Buffers’ menu (from the menubar) where the mouse is clicked. It should be bound to a mouse button event.
This function pops up a copy of menu that also appears in the menubar. It should be bound to a mouse button event.
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Menu accelerators are keyboard shortcuts for accessing the menubar. Accelerator keys can be specified for menus as well as for menu items. An accelerator key for a menu is used to activate that menu when it appears as a submenu of another menu. An accelerator key for a menu item is used to activate that item.
27.7.1 Creating Menu Accelerators | How to add accelerator keys to a menu. | |
27.7.2 Keyboard Menu Traversal | How to use and modify the keys which are used to traverse the menu structure. | |
27.7.3 Menu Accelerator Functions | Functions for working with menu accelerators. |
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Menu accelerators are specified as part of the menubar format using the :accelerator tag to specify a key or by placing "%_" in the menu or menu item name prior to the letter which is to be used as the accelerator key. The advantage of the second method is that the menu rendering code then knows to draw an underline under that character, which is the canonical way of indicating an accelerator key to a user.
For example, the command
(add-submenu nil '("%_Test" ["One" (insert "1") :accelerator ?1 :active t] ["%_Two" (insert "2")] ["%_3" (insert "3")])) |
will add a new menu to the top level menubar. The new menu can be reached by pressing "t" while the top level menubar is active. When the menu is active, pressing "1" will activate the first item and insert the character "1" into the buffer. Pressing "2" will activate the second item and insert the character "2" into the buffer. Pressing "3" will activate the third item and insert the character "3" into the buffer.
It is possible to activate the top level menubar itself using accelerator keys. See section Menu Accelerator Functions.
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In addition to immediately activating a menu or menu item, the keyboard can be used to traverse the menus without activating items. The keyboard arrow keys, the return key and the escape key are defined to traverse the menus in a way that should be familiar to users of any of a certain family of popular PC operating systems.
This behavior can be changed by modifying the bindings in menu-accelerator-map. At this point, the online help is your best bet for more information about how to modify the menu traversal keys.
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Make the menubar immediately active and place the cursor on the left most entry in the top level menu. Menu items can be selected as usual.
Whether menu accelerator keys can cause the menubar to become active.
If menu-force
or menu-fallback
, then menu accelerator keys can
be used to activate the top level menu. Once the menubar becomes active, the
accelerator keys can be used regardless of the value of this variable.
menu-force
is used to indicate that the menu accelerator key takes
precedence over bindings in the current keymap(s). menu-fallback
means
that bindings in the current keymap take precedence over menu accelerator keys.
Thus a top level menu with an accelerator of "T" would be activated on a
keypress of Meta-t if menu-accelerator-enabled
is menu-force
.
However, if menu-accelerator-enabled
is menu-fallback
, then
Meta-t will not activate the menubar and will instead run the function
transpose-words, to which it is normally bound.
The default value is nil
.
See also menu-accelerator-modifiers
and menu-accelerator-prefix
.
Keymap consulted to determine the commands to run in response to keypresses occurring while the menubar is active. See section Keyboard Menu Traversal.
A list of modifier keys which must be pressed in addition to a valid menu
accelerator in order for the top level menu to be activated in response to
a keystroke. The default value of (meta)
mirrors the usage of the alt key
as a menu accelerator in popular PC operating systems.
The modifier keys in menu-accelerator-modifiers
must match exactly the
modifiers present in the keypress. The only exception is that the shift
modifier is accepted in conjunction with alphabetic keys even if it is not a
menu accelerator modifier.
See also menu-accelerator-enabled
and menu-accelerator-prefix
.
Prefix key(s) that must be typed before menu accelerators will be activated. Must be a valid key descriptor.
The default value is nil
.
(setq menu-accelerator-prefix ?\C-x) (setq menu-accelerator-modifiers '(meta control)) (setq menu-accelerator-enabled 'menu-force) (add-submenu nil '("%_Test" ["One" (insert "1") :accelerator ?1 :active t] ["%_Two" (insert "2")] ["%_3" (insert "3")])) |
will add the menu "Test" to the top level menubar. Pressing C-x followed by C-M-T will activate the menubar and display the "Test" menu. Pressing C-M-T by itself will not activate the menubar. Neither will pressing C-x followed by anything else.
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