how to scroll horizontally with mouse wheel in emacs when "truncate long lines" is enabled?

Question

In the truncate mode, only partial lines are displayed in the window. I know C-x < and C-x > can scroll left and right, but I'd like a more convenient way to handle horizontal scrolling - the way alike what we scroll vertically with mouse wheel (possibly combined with pressing other modification keys). Is there any way to set it up in .emacs? Thanks.

Answer 1

mwheel-scroll internally calls

(funcall mwheel-scroll-down-function)

resp. for up

a toggle-command might replace this function with scroll-left resp. the other spot with ...-right.