[PATCH libinput 1/2] touchpad: make the edge-scroll edge 7mm wide

[Peter Hutterer]

On Sun, Jan 14, 2018 at 01:34:35AM +0100, Alexander Karlstad wrote:
> > Rather than magic percentages of the touchpad axis ranges, make it a fixed
> > size of 7mm. Except on synaptics touchpads, because they won't give us the
> > actual axis range but rather the "typical bezel limits".
> > 
> > Signed-off-by: Peter Hutterer <peter.hutterer at who-t.net>
> > ---
> >  src/evdev-mt-touchpad-edge-scroll.c | 25 +++----------------------
> >  1 file changed, 3 insertions(+), 22 deletions(-)
> > 
> > diff --git a/src/evdev-mt-touchpad-edge-scroll.c b/src/evdev-mt-touchpad-edge-scroll.c
> > index ade55e0..96fbca6 100644
> > --- a/src/evdev-mt-touchpad-edge-scroll.c
> > +++ b/src/evdev-mt-touchpad-edge-scroll.c
> > @@ -287,30 +287,11 @@ int
> >  tp_edge_scroll_init(struct tp_dispatch *tp, struct evdev_device *device)
> >  {
> >  	struct tp_touch *t;
> > -	int width, height;
> >  	int edge_width, edge_height;
> >  
> > -	width = device->abs.dimensions.x;
> > -	height = device->abs.dimensions.y;
> > -
> > -	switch (tp->model) {
> > -	case MODEL_ALPS:
> > -		edge_width = width * .15;
> > -		edge_height = height * .15;
> > -		break;
> > -	case MODEL_APPLETOUCH: /* unibody are all clickpads, so N/A */
> > -		edge_width = width * .085;
> > -		edge_height = height * .085;
> > -		break;
> > -	default:
> > -		/* For elantech and synaptics, note for lenovo #40 series,
> > -		 * e.g. the T440s min/max are the absolute edges, not the
> > -		 * recommended ones as usual with synaptics.
> > -		 */
> > -		edge_width = width * .04;
> > -		edge_height = height * .054;
> > -		break;
> > -	}
> > +	/* 7mm edge size */
> > +	edge_width = device->abs.absinfo_x->resolution * 7;
> > +	edge_height = device->abs.absinfo_y->resolution * 7;
> >  
> >  	tp->scroll.right_edge = device->abs.absinfo_x->maximum - edge_width;
> >  	tp->scroll.bottom_edge = device->abs.absinfo_y->maximum - edge_height;
> 
> 
> Hi
> 
> I found this in the archives and from what I can see this is the code
> being used today. I am looking for a way to change the width of the
> vertical scroll when edge scrolling is enabled, but I have not been
> successful yet. Is there a way of doing this with 'xinput' or in a
> config file somewhere, or do I need to manually change it in the source
> and compile it?

there's no configuration option for it, it's hard-coded. 7mm should be
enough for the average finger - why do you need to change it?

Cheers,
   Peter