On 12 April 2012 23:50, Peter Hutterer <[email protected]> wrote: > On Wed, Apr 11, 2012 at 10:00:56PM -0400, Alyssa Hung wrote: >> This patch adds two options to the synaptics driver: InvertEdgeScroll >> and InvertTwoFingerScroll. >> >> When enabled, they will cause the scroll direction to be inverted when >> edge scrolling and two-finger scrolling, respectively. For instance, >> moving a finger downward along the right edge will pull the scrolled >> content down (causing the page to scroll up). This behaviour is >> consistent with scrolling on modern touchscreen devices. >> >> Options are provided separately for edge scrolling and two-finger >> scrolling because they follow different metaphors; edge scrolling has >> traditionally been analogous to dragging the scrollbar tab, and may >> therefore be sensible to leave uninverted even when two-finger scroll >> direction is inverted. >> >> Signed-off-by: Alyssa Hung <[email protected]> > > Thansk Alyssa, two comments regarding this option: > In general, I'm not in favour of adding more options to synaptics. This > particular one is something that we need to deal with in other drivers as > well. With server 1.12, scrolling is now controlled by the increment in the > XIScrollClass, simply changing that could change not only the speed but > also the direction. While support for modifying the increment is the best > solution, it needs a protocol revision. > > In this particular case, synaptics already has a > VertScrollDelta and HorizScrollDelta option that controls the amount of > movement before a scroll event is emitted. I think it should be simple > enough to change the code that negative deltas are permitted for scroll > direction inversion. > > Cheers, > Peter
Hi Peter, thanks for your advice. I wasn't aware of XIScrollClass increments or their relationship to the VertScrollDelta and HorizScrollDelta options. Following your recommendation, I have attached a patch that allows them to be set to negative values. I regret that it won't be possible to invert scroll direction for only two-finger scrolling or edge scrolling, but I suppose it isn't a common use case for them to both be enabled. Regards, Alyssa
0001-Support-inverted-scroll-direction.patch
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