Canvas blocks mouseup events on itself.

Calling jQuery(viewer.canvas).on("mouseup", function() { console.log("mouseup"); }); does not work. Neither does using openSeadragon’s .addEvent method for “mouseup”.

[iangilman]

Interesting. The general procedure is to use OpenSeadragon.MouseTracker to handle events on overlays, but I guess maybe that wouldn’t hook into React very well.

Under the hood setMouseNavEnabled calls the setTracking function of the viewer’s MouseTrackers… at the moment there’s no mechanism to be more specific than all on or all off.

Anyway, MouseTracker is where to look if you want to dig in more.

[iangilman]

Hopefully @msalsbery can weigh in because he understands the gesture handling better than anyone. My understanding is that the swallowing was necessary in order to properly handle gestures on devices that handle more than one kind of gesture. OSD supports mouse, touch, and pen gestures, and some devices, like the Microsoft Surface support all three simultaneously. I believe it’s keeping all those straight that means we need to stop the events from propagating. @msalsbery can weigh in though.

If you want to dig in deeper, look for stopEvent and stopPropagation in the MouseTracker source. Maybe there’s a way to keep everything straight without stopping the events…