@Override
			protected void paintIcon( Component c, Graphics2D g ) {
				g.setColor( colorAtMouse );
				g.fillRect( 0, 0, WIDTH, HEIGHT );
			}
An invisible window used to receive mouse and keyboard events for the whole screen.
flatlaf-theme-editor/src/main/java/com/formdev/flatlaf/themeeditor/FlatColorPipette.java