Custom button for rotate: mouseDown / mouseUp ?

[issimissimo]

Hello,
I'm trying to make custom buttons to rotate left, tight, top, bottom, in a continuous way (as long as the button is pressed the image keep rotating).
The problem is that the OnClick property of the custom button does not pass the element (the button) to another function, so I can't detect when the mouse is released from the button.
Is there a way to detect "OnMouseUp" (or something like that) from custom button?

[mistic100]

it does not matter where you listen to the mouseup even as long as it is a parent of the button, for exemple document

the zoom buttons actually listen to mouseup on the parent container, but it could be document
https://github.com/mistic100/Photo-Sphere-Viewer/blob/dev/src/buttons/AbstractZoomButton.js#L35

if would be awesome if could propose such buttons in the core. Actually all the base logic is already implemented in AbstractZoomButton, it should be simple to create an AbstractMaintainButton used for both zoom and navigation buttons

[issimissimo]

Many thanks @mistic100 , as usual!
Unfortunately actually I don't have time to implement this button in the core, but I'll do.
For now I've just ended up with a dirty solution:
viewer.navbar.container.addEventListener('mouseup', function () { console.log("MOUSE UP") });

[mistic100]

I track this feature in a new ticket : #526