ToolBarButton.java 文件源码

@Override
        protected void paintComponent(Graphics g) {
            super.paintComponent(g);
//            g.clearRect(29, 0, 55, 35);

            g.setColor((mouseOver || button.isSelected())
                    //                        ? SystemColor.controlDkShadow
                    //                        : SystemColor.activeCaptionBorder);
                    ? SystemColor.activeCaptionBorder
                    : SystemColor.control);

            g.drawLine(29, 7, 29, 27);

            if (ToolBarButton.this.actionListener != null) {
//                    g.setColor(SystemColor.activeCaptionBorder);
                g.setColor(SystemColor.controlDkShadow);
            }

            int x = 24 + 13;
            int y = this.getHeight() / 2 + 1;
            int aw = 4;
            int ah = 2;

            g.fillPolygon(new int[]{x - aw, x + aw, x}, new int[]{y - ah, y - ah, y + ah}, 3);
        }