Input system

TODO

Table of behavior in different configurations

positions	centering		single button	+/- button	togglable	event	draggable
0	no		no	no	no	value change	yes
1	no		yes	no	yes	key down	no
2	no		yes	yes	yes	key up	yes
3+	no		yes	yes	yes	key up	yes
0	yes		no	no	no	value change	yes
1	yes		yes	no	yes	key down	no
2	yes		yes	yes	yes	key down and up	yes
3+	yes		no	yes	no	key up	yes

• single button: can be action controlled by single button binding
• +/- button: can be action controlled by two + and - buttons
• togglable
• event: in what situation is handler (function callback) called
• draggable: can be action controlled by dragging in cockpit

Notes:

• When "positions" is set to 0, the value moves from "minval" to "maxval". This is the only option, where the action handler continuously sends events together with info about value change, depending on the parameters.

• Elements with "positions" set to 1 ignore "centering" value, they center automatically.