How-to Scrollwheel Effect on Logitech trackball (Marble Mouse)

**Buffalo Soldier** · March 13th, 2006

End Result
Using trackball to emulate wheel button scroll (horizontal & vertical) in web browser (Epiphany 2.14.0 and Firefox 1.5.0.1).

Method

Open xorg.conf file using a text editor (gedit). Go to Applications -> Accessories -> Terminal and enter command:
Code:
```
sudo gedit /etc/X11/xorg.conf
```

Look for a section that contains the entry for your mouse, it looks kind of like this.

Code:

Section "InputDevice"
	Identifier	"Configured Mouse"
	Driver		"mouse"
	Option		"CorePointer"
	Option		"Device"		"/dev/input/mice"
	Option		"Protocol"		"ImPS/2"
	Option		"ZAxisMapping"		"4 5"
	Option		"Emulate3Buttons"	"true"
EndSection

Edit that section into this:

Code:

Section "InputDevice"
	Identifier	"Configured Mouse"
	Driver		"mouse"
	Option		"CorePointer"
	Option		"Device"		"/dev/input/mice"
	Option		"Protocol"		"ExplorerPS/2"
	Option		"Emulate3Buttons"	"true"
	Option		"Buttons"		"9"
	Option		"EmulateWheel"		"1"
	Option		"EmulateWheelButton"	"8"	# for right-handed people
	Option		"YAxisMapping"		"4 5" 
	Option		"XAxisMapping"		"6 7" 
EndSection

For left-handed people. Use this:

Code:

Option		"EmulateWheelButton"	"9"	# for left-handed people

Go to Epiphany / Firefox address bar and type:
Code:
```
about:config
```

Filter for the word scroll and look for these lines:

Code:

mousewheel.horizscroll.withnokey.action		default		integer	2
mousewheel.horizscroll.withnokey.sysnumlines	default		boelean	false

Change the default value into new value:

Code:

mousewheel.horizscroll.withnokey.action		user set	integer	0
mousewheel.horizscroll.withnokey.sysnumlines	user set	boelean	true

Step

References:

a. Xorg user documentation

Option "Buttons" "integer"
Specifies the number of mouse buttons. In cases where the number of buttons cannot be auto-detected, the default value is 3. The maximum number is 24.

Option "Emulate3Buttons" "boolean"
Enable/disable the emulation of the third (middle) mouse button for mice which only have two physical buttons. The third button is emulated by pressing both buttons simultaneously. Default: off

Option "EmulateWheel" "boolean"
Enable/disable "wheel" emulation. Wheel emulation means emulating button press/release events when the mouse is moved while a specific real button is pressed. Wheel button events (typically buttons 4 and 5) are usually used for scrolling. Wheel emulation is useful for getting wheel-like behaviour with trackballs. It can also be useful for mice with 4 or more buttons but no wheel. See the description of the EmulateWheelButton, EmulateWheelInertia, XAxisMapping, and YAxisMapping options below. Default: off.

Option "EmulateWheelButton" "integer"
Specifies which button must be held down to enable wheel emulation mode. While this button is down, X and/or Y pointer movement will generate button press/release events as specified for the XAxisMapping and YAxisMapping settings. Default: 4.

Option "XAxisMapping" "N1 N2"
Specifies which buttons are mapped to motion in the X direction in wheel emulation mode. Button number N1 is mapped to the negative X axis motion and button number N2 is mapped to the positive X axis motion. Default: no mapping.

Option "YAxisMapping" "N1 N2"
Specifies which buttons are mapped to motion in the Y direction in wheel emulation mode. Button number N1 is mapped to the negative Y axis motion and button number N2 is mapped to the positive Y axis motion. Default: "4 5".

b. mozillaZine

Mousewheel.*

These fall into two groups, vertical and horizontal scroll. The general form is: