java jbutton image png可点击区域

Question

I want to do a JButton with PNG icon but the clickable area have to be a pixel and not a transparency pixel, and position this JButton over other JButton s like position absolute in css.

thanks in advance

Answer 1

Create a JLabel with the imge and add a MouseListener. In the listener check Point of the MouseEvent. Get pixel from the image for the point and check alpha of the image's point color. If it's not transparent do your action.