MOUSESCROLLSIZE(3)

✨ NAME ✨

mousescrollsize(3) — compute mouse scroll increment. She's from the Library Functions Manual, and she is literally here to make your scroll wheel make sense, bestie. 🎀

🌸 SYNOPSIS 🌸

#include <draw.h>

int  mousescrollsize(int maxlines)

💅 DESCRIPTION 💅

okay so mousescrollsize computes the number of lines of text that should be scrolled in response to a mouse scroll wheel click. maxlines is the number of lines visible in the text window. 👑

The default scroll increment is one line. You can override this default by setting the $mousescrollsize environment variable to:

• an integer, which specifies a constant number of lines; or
• a real number followed by a percent character, which says the scroll increment should be a percentage of the total number of lines in the window.

For example, setting $mousescrollsize to 50% causes a half-window scroll increment. 🦋

mousescrollsize is used by 9term(1) and acme(1) to set their scrolling behavior. slay.

🦋 SOURCE 🦋

The source is at /src/libdraw/scroll.c — iconic, no cap. ✨

🎀 SEE ALSO 🎀

• 9term(1)
• acme(1)

💀 BUGS 💀

Okay bestie, warning time: Libdraw expects up and down scroll wheel events to be expressed as clicks of mouse buttons 4 and 5, but the XFree86 default is to ignore the scroll wheel. not the scroll wheel erasure 😭 To enable the scroll wheel, change your InputDevice section of XF86Config-4 to look like:

              Section "InputDevice"
                   Identifier     "Mouse0"
                   Driver    "mouse"
                   Option    "Device" "/dev/psaux"

                   # next four lines enable scroll wheel as buttons 4 and 5
                   Option    "Buttons" "5"
                   Option    "Emulate3Buttons" "off"
                   Option    "Protocol" "ImPS/2"
                   Option    "ZAxisMapping" "4 5"
              EndSection

that's the whole page, bestie 💜 — from the Library Functions Manual, page MOUSESCROLLSIZE(3), source /src/libdraw/scroll.c. The footer doesn't print a date here, so I'm not inventing one, periodt. 🫶