I have vertical and horizontal scroll bars for scrolling a large picture displayed in a canvas. The scroll bars are working except for one problem.
If I position the mouse pointer above the slider on the vertical scroll bar and hold down the mouse button, the slider moves up towards the mouse pointer, and the canvas refreshes continuously while this is happening, as one would expect. However, if I directly drag the scroll bar slider with the mouse, the canvas doesn’t refresh until after I release the mouse button. I’ve tried just about every event handler I can think of for the scroll bar, but can’t get live scrolling while dragging the slider. Am I missing something, or is this just not possible?
Edit: I should mention that this is 2016v3 on MacOS desktop. Haven’t tried it on Windows yet.