There are a few customization options that are specific to the Nextstep port. For example, they affect things such as the modifier keys and the fullscreen behavior. To see all such options, use M-x customize-group RET ns RET.
The following variables control the behavior of the actual modifier keys:
The left and right Option or Alt keys.
The left and right Command keys.
The left and right Control keys.
The Function (fn) key.
The value of each variable is either a symbol, describing the key for
any purpose, or a list of the form
(:ordinary symbol :function symbol :mouse symbol),
which describes the modifier when used with ordinary keys, function keys
(that do not produce a character, such as arrow keys), and mouse clicks.
If the symbol is one of
hyper, this describes the Emacs modifier it
represents. If symbol is
none, Emacs does not use the
key, which retains its standard behavior. For instance, the
Option key in macOS is then used for composing additional
The variables for right-hand keys, like
may also be set to
left, which means to use the same behavior as
the corresponding left-hand key.
This variable specifies whether to display the proxy icon in the
titlebar. The proxy icon can be used to drag the file associated with
the current buffer to other applications, a printer, the desktop,
etc., in the same way you can from Finder. You might have to disable
tool-bar-mode to see the proxy icon.
This variable specifies whether to display a graphical confirmation dialog on quitting.
This variable specifies whether the macOS menu bar is hidden when an
Emacs frame is selected. If non-
nil the menu bar is not shown unless
the mouse pointer is moved near to the top of the screen.
This variable controls whether to use native, or non-native fullscreen. Native fullscreen is only available on macOS 10.7 and above.
These variables only apply to macOS 10.7 (Lion) and above.
This variable controls whether Emacs ignores the system mousewheel
nil each ‘click’ of the mousewheel will
correspond exactly with one mousewheel event. When non-
the default, each ‘click’ may correspond with more than one mousewheel
event, depending on the user’s input.
This variable controls whether Emacs ignores the system ‘momentum’
when scrolling using a trackpad. When non-
nil, the default, scrolling
rapidly may result in the buffer continuing to scroll for a short
while after the user has lifted their fingers off the trackpad.
This variable controls the sensitivity of scrolling with the trackpad.
Apple trackpads scroll by pixels, not lines, so Emacs converts the
system’s pixel values into lines. When set to a number, this variable
sets the number of pixels Emacs will consider as one line. When
nil or a non-number the default line height is used.
Setting a lower number makes the trackpad more sensitive, and a higher number makes the trackpad less sensitive.