The scroll bar is not drawn,How do I set him up?

[xcfdszzr]

        final JScrollPane scrollPane = new JScrollPane ();
        scrollPane.putClientProperty ( StyleId.STYLE_PROPERTY,  StyleId.scrollpaneTransparentHovering );
        scrollPane.setPreferredSize ( new Dimension ( 200, 160 ) );
        WebPanel webPanel = new WebPanel(new LineLayout(LineLayout.VERTICAL));
        for (int i = 0; i < 100; i++) {
            webPanel.add(new WebLabel("11111"));
        }
        scrollPane.setViewportView(webPanel);

When I add a component, the scrollbar becomes undrawable or the drawing is dirty

[mgarin]

This happens because the WebPanel you add into scroll pane is opaque. If you want any component to hover over other one without visual glitches like on your screenshot - that other component needs to be non-opaque, otherwise repaint calls will not make it past that other component when necessary.

[xcfdszzr]

This happens because the WebPanel you add into scroll pane is opaque. If you want any component to hover over other one without visual glitches like on your screenshot - that other component needs to be non-opaque, otherwise repaint calls will not make it past that other component when necessary.

Thank you author, my problem has been solved