If the tagmode setting is 'tagremains' (the default): Play as long as the
tag is on the reader, with a 5 second timeout (i.e. playback stops when
tag is gone for more than 5 seconds).
If the tagmode setting is 'tagstartstop': Playback starts when a tag is
seen. Presenting a different tag causes the playback to stop and
playback for the new tag to start. Re-presenting the same tag used to
start with a no-tag-time of 5 seconds or more in between stops playback.
Signed-off-by: Matthias Blankertz <matthias@blankertz.org>
Split the tag handling in PlayerApp into two parts: The low level
handling of changed/removed tags from the Nfc reader, including the
timeout processing is moved into the nested TagStateMachine class. The
main PlayerApp has two new (internal) callbacks "onNewTag" and
"onTagRemoved" which are called when a new tag is presented or a tag was
actually removed. This will hopefully make the implementation of #28
"Configurable Tag Handling" cleaner.
Signed-off-by: Matthias Blankertz <matthias@blankertz.org>
