It was a bit confusing and seems to be gone, they now use ctrl/shift modifiers instead of separating the area, which is arguably less awkward but also way less discoverable.
E.g. a hidden door has no affordance according to Norman. Gibson on the other hand, considers doors ability to be opened its affordance.
I think article usage is on point for Norman's definition.
You're right that a hidden door has no affordance, according to Norman (though others have claimed "hidden" affordances).
However, I'm referring to the author's statements like these:
> There is no static affordance showing you what you can do [...]
What's missing, the "static <thing>" is not an affordance, it's the signifier -- an indicator that the action is possible.
Curiously, it’s at the far bottom right of the screen, such that it’s easy to use the majority of the screen to the left to lower the volume, while increasing the volume is difficult due to the limited screen real wastage to the right. No doubt this was placed here for the passenger of the vehicle to use, but the result that it’s safer to lower the volume quickly than increase it quickly is interesting to me.
Though, I suppose it would have the opposite effect when the passenger is on the left side of the vehicle.
The video seek bar works as a normal seek bar with left/right dragging, but the seek rate can be slowed down (finer seek) by dragging the finger up, and then moving left/right.
I have yet to see good video seek features in Android.
I found it reasonably discoverable.
At first I assumed I had to touch the boundary between the light and dark part of the slider, but eventually I missed and noticed it still slid. I then experimented to see how close I had to get, and found that anywhere in the control would do and once sliding I did not need to stay inside.