A fairly simple feature - preferences for velocity sensitivity, but a
fair amount of UI infrastructure. This patch includes a new
KnobPreference, changes to KnobView to support a horizontal layout
(which works better in a layout with more compressed vertical space),
and of course the plumbing of the preference itself.
Also some rework of the touch handler in the KeyboardView. This patch
simplifies the logic a bit and fixes a long-standing bug in which the
pressure was always read from pointer index 0 rather than the pointer
index of the key being pressed.
The main reason for these to be inside the KnobView is so that they can
be part of the touch target for the knob. A more general approach would
be to make the Knob a container that can contain TextView widgets, but
this is simpler.
Raph Levien
Bryan Klimt