26.13 Scroll Bars
When using X, Emacs normally makes a scroll bar at the left of
each Emacs window.1
The scroll bar runs the height of the window, and shows a moving
rectangular inner box which represents the portion of the buffer
currently displayed. The entire height of the scroll bar represents the
entire length of the buffer.
You can use Mouse-2 (normally, the middle button) in the scroll
bar to move or drag the inner box up and down. If you move it to the
top of the scroll bar, you see the top of the buffer. If you move it to
the bottom of the scroll bar, you see the bottom of the buffer.
The left and right buttons in the scroll bar scroll by controlled
increments. Mouse-1 (normally, the left button) moves the line at
the level where you click up to the top of the window. Mouse-3
(normally, the right button) moves the line at the top of the window
down to the level where you click. By clicking repeatedly in the same
place, you can scroll by the same distance over and over.
You can also click C-Mouse-2 in the scroll bar to split a
window vertically. The split occurs on the line where you click.
You can enable or disable Scroll Bar mode with the command M-x
scroll-bar-mode. With no argument, it toggles the use of scroll bars.
With an argument, it turns use of scroll bars on if and only if the
argument is positive. This command applies to all frames, including
frames yet to be created. Customize the variable
to control the use of scroll bars at startup. You can use it to specify
that they are placed at the right of windows if you prefer that. You
have to set this variable through the ‘Customize’ interface
(see Easy Customization). Otherwise, it will not work properly.
You can use the X resource ‘verticalScrollBars’ to control the
initial setting of Scroll Bar mode similarly. See Resources.
To enable or disable scroll bars for just the selected frame, use the
command M-x toggle-scroll-bar.
You can control the scroll bar width by changing the value of the
scroll-bar-width frame parameter.