DefaultButton.java 文件源码

public static void drawBackground(Graphics g, ButtonState s) {
    Rectangle rect = s.getBounds();
    Color bkColor = s.isBackgroundSet() ? s.getBackground() :
                                          SystemColor.control;
    g.setColor(bkColor);
    g.fillRect(0, 0, rect.width, rect.height);

    drawButtonFrame(g, s.getBounds(), s.isPressed());

    if (s.isFocused()) {
        Color foreColor = s.isTextColorSet() ?
                s.getTextColor() :
                SystemColor.controlText;
        g.setColor(foreColor);

        drawFocusRect(g, 3, 3, rect.width - 7, rect.height - 7);
    }
}