BasicButtonUI

swing的JButton方方正正,看久了总觉得审美疲劳了,看了apple上的按钮,就舒服多了。借助java2D,要做类似那种按钮也不是不可能的。

    要做到这个效果,可以重写BasicButtonUI然后给调用JButton的setUI,也可以继承JButton重写部分方法。两者原理都一样,我 这里用的是第二种。原理就是重新绘制Jbutton包括按钮,边框等,也就是重写paintComponent(Graphics g).

public class BasicButton extends JButton {  
      
        /** 
         *  
         */  
        private static final long serialVersionUID = 1L;  
      
        public static final Color BUTTON_COLOR1 = new Color(125, 161, 237);  
        public static final Color BUTTON_COLOR2 = new Color(91, 118, 173);  
        public static final Color BUTTON_BAK_COLOR1_1 = new Color(108, 135, 210,  
                179);  
        public static final Color BUTTON_BAK_COLOR1_2 = new Color(108, 135, 210,  
                255);  
        public static final Color BUTTON_BAK_COLOR2_1 = new Color(180, 230, 250,  
                179);  
        public static final Color BUTTON_BAK_COLOR2_2 = new Color(180, 230, 250,  
                255);  
        public static final Color BUTTON_FOREGROUND_COLOR = Color.BLACK;  
        private boolean hover;  
      
        public BasicButton(String text) {  
            super(text);  
                //步骤1  
            setBorderPainted(false);  
            setFocusPainted(false);  
            setContentAreaFilled(false);  
      
            setForeground(BUTTON_FOREGROUND_COLOR);  
            addMouseListener(new MouseAdapter() {  
                @Override  
                public void mouseEntered(MouseEvent e) {  
                    hover = true;  
                    repaint();  
                }  
      
                @Override  
                public void mouseExited(MouseEvent e) {  
                    hover = false;  
                    repaint();  
                }  
            });  
        }  
      
        @Override  
        protected void paintComponent(Graphics g) {  
            Graphics2D g2d = (Graphics2D) g.create();  
            int h = getHeight();  
            int w = getWidth();  
    //      Color color2 = BUTTON_BAK_COLOR1_2;  
    //      Color color1 = BUTTON_BAK_COLOR2_2;  
            float tran = 1F;  
            if (!hover) {  
                tran = 0.7F;  
    //          color2 = BUTTON_BAK_COLOR1_1;  
    //          color1 = BUTTON_BAK_COLOR2_1;  
            }  
                //步骤2  
            g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING,  
                    RenderingHints.VALUE_ANTIALIAS_ON);  
            GradientPaint p1;  
            GradientPaint p2;  
            if (getModel().isPressed()) {  
                p1 = new GradientPaint(0, 0, new Color(0, 0, 0), 0, h - 1,  
                        new Color(100, 100, 100));  
                p2 = new GradientPaint(0, 1, new Color(0, 0, 0, 50), 0, h - 3,  
                        new Color(255, 255, 255, 100));  
            } else {  
                p1 = new GradientPaint(0, 0, new Color(100, 100, 100), 0, h - 1,  
                        new Color(0, 0, 0));  
                p2 = new GradientPaint(0, 1, new Color(255, 255, 255, 100), 0,  
                        h - 3, new Color(0, 0, 0, 50));  
            }  
    //设置透明度  
      
                 g2d.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC_OVER,  
                    tran));  
            Shape clip = g2d.getClip();  
               //绘制整个按钮  
            RoundRectangle2D.Float r2d = new RoundRectangle2D.Float(0, 0, w - 1,  
                    h - 1, h, h);  
            g2d.clip(r2d);  
            GradientPaint gp = new GradientPaint(0.0F, 0.0F, BUTTON_COLOR1, 0.0F,  
                    h, BUTTON_COLOR2, true);  
            g2d.setPaint(gp);  
            g2d.fillRect(0, 0, w, h);  
                    //鼠标移入就绘制立体效果  
            if (hover) {  
                RoundRectangle2D.Float r2d2 = new RoundRectangle2D.Float(5, 2,  
                        w - 10, h / 2 - 1, h / 2, h / 2);  
                g2d.clip(r2d2);  
                GradientPaint gp2 = new GradientPaint(0.0F, 0.0F, BUTTON_BAK_COLOR2_2, 0.0F,  
                        h / 2, BUTTON_BAK_COLOR1_2, true);  
                g2d.setPaint(gp2);  
                g2d.fillRect(5, 2, w - 10, h / 2);  
            }  
            g2d.setClip(clip);  
                    //绘制边框  
            g2d.setPaint(p1);  
            g2d.drawRoundRect(0, 0, w - 1, h - 1, h, h);  
            g2d.setPaint(p2);  
            g2d.drawRoundRect(1, 1, w - 3, h - 3, h - 2, h - 2);  
            g2d.dispose();  
            super.paintComponent(g);  
        }  
    }

基本步骤就是:
1.先调用父类的方法,让父类不用绘制边框、不用绘制焦点、不用绘制内容,我们自己来完成这些东西。
2.调用抗锯齿的api,让我们paint出来的线条平滑,要不然会有相当难看的锯齿。
3.设置透明度。这个主要是为了做出鼠标移入、移出的效果。我这里是移入按钮,按钮颜色加深并且会有视觉效果上的“凸起”立体感;移出就颜色变浅,凸起感消失,恢复原样了。
4.绘制整个按钮。生成一个圆角矩形,并用由上到下的渐进色填充,这就是按钮的整体效果。
5.如果鼠标移入就绘制立体效果。在这里我是先生成一个高度为按钮一半的圆角矩形,然后从上到下用渐进色填充,最下面的颜色就是按钮本身在中间位置的颜色,这样看起来上面是白的,好像反光的立体效果。
6.绘制边框。用于点击效果的显示。
如果要真正想apple那样的效果,就还需要用另外的区域来模糊化下半个按钮部分,需要涉及到调整颜色之类的,我这就没做了,大概的效果图如下:
正常状态

鼠标移上去

鼠标按下去

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