Custom slider UI Swing

Question

I'm trying to create a custom extension of BasicSliderUI. I'm just trying to make the thumb a circle (note I'm in the Windows L&F). I've created a very simple implementation that just calls g.drawOval, but whenever I drag it, it leaves a "trail" behind. Any ideas why this is?

thanks,

Jeff

Answer 1

You need to call repaint on the whole thing, you cant just draw the oval on top of it. Swing will by default only repaint what needs to be repainted, which usually isn't the whole control. When are you drawing the circle?