Does vsgTrackBall have a double-click ButtonMask now?

[jacky-wang7]

Hi, everyone!
I looked at the source code and saw ButtonMask in PointerEvent.h.
BUTTON_MASK_1 to BUTTON_MASK_3 correspond to the left, middle and right buttons,
but I don't see how to use BUTTON_MASK_4 and BUTTON_MASK_5.
If I want to get a double-click signal in trackBall, what should I do?

[jacky-wang7]

I saw the same discussions:
#1087
Sorry for not searching this before asking the question