一直都是一只菜鸟..不管别人怎么说.

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一直认为Swing不丑..所以打算这段时间写个Swing不丑系列(献丑了)
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话说JComboBox 默认外观确实不是太好看..在由于本人有时实在太贱.就是想要它好看...所以..这不..又折腾了..
其实这个ComboBox 刚开始想改变外观 只考虑到renderer 毕竟swing上所有的界面 显示全靠renderer来控制..
所以 着手写ComboBoxRenderer. 总是觉的 JComboBox 似乎不太好搞定 因为它不但有显示框 还有小键头.
还有弹出的List 还有ScrollBar..等等.. 似乎不那么好搞...不过Swing是强大的 ..只要你能想到..就可以做到.
那么我们要做几件事.
1: 重载JComboBox 并且设置面板透明
2: 新建renderer 实现ListCellRenderer接口
3: 重载BasicComboBoxUI
1.重载JComboBox 并且设置面板透明 设置renderer 以及设置 ui
- public class IComboBox extends JComboBox{
 - public IComboBox(){
 - super();
 - init();
 - }
 - public IComboBox(ComboBoxModel model){
 - super(model);
 - init();
 - }
 - public IComboBox(Object[] items){
 - super(items);
 - init();
 - }
 - public IComboBox(Vector items){
 - super(items);
 - init();
 - }
 - private void init(){
 - setOpaque(false);
 - setUI(new IComboBoxUI());
 - setRenderer(new IComboBoxRenderer());
 - setBackground(XUtil.defaultComboBoxColor);
 - }
 - public Dimension getPreferredSize(){
 - return super.getPreferredSize();
 - }
 - }
 
2.新建renderer 实现ListCellRenderer接口.注意.这里的ComboBoxRenderer它是控制combobox弹出的List 并非控制JComboBox的 注意 他实现的是ListCellRenderer
- public class IComboBoxRenderer implements ListCellRenderer {
 - private DefaultListCellRenderer defaultCellRenderer = new DefaultListCellRenderer();
 - public IComboBoxRenderer() {
 - super();
 - }
 - public Component getListCellRendererComponent(JList list, Object value,
 - int index, boolean isSelected, boolean cellHasFocus) {
 - JLabel renderer = (JLabel)defaultCellRenderer.getListCellRendererComponent(
 - list, value, index, isSelected, cellHasFocus);
 - if(isSelected){
 - renderer.setBackground(XUtil.defaultComboBoxBoundsColor);
 - renderer.setForeground(Color.WHITE);
 - }else{
 - renderer.setBackground(Color.WHITE);
 - }
 - list.setSelectionBackground(XUtil.defaultComboBoxColor);
 - list.setBorder(null);
 - renderer.setFont(XUtil.defaultComboBoxFont);
 - renderer.setHorizontalAlignment(JLabel.CENTER);
 - return renderer;
 - }
 - }
 
3重载BasicComboBoxUI .sure 这里当然要注意.因为他是JComboBox的绘制机制
这里包括ComboBox右边的那个箭头的Button.(我们已经通过重写 createArrowButton 来改变这个Button);
至于弹出的List ,it in here, look it ..createPoput(); it create ComboPopup.(不好意思 最近在学英文 总是那么顺口来那么几句.)
这里存在一个ScrollPane 它包含了List.并且我们重写ScrollPane的paintBorder方法 来让我们画出List的Border
- public class IComboBoxUI extends BasicComboBoxUI {
 - private JButton arrow;
 - private boolean boundsLight = false;
 - private static final int ARCWIDTH = 15;
 - private static final int ARCHEIGHT = 15;
 - public IComboBoxUI() {
 - super();
 - }
 - protected JButton createArrowButton() {
 - arrow = new JButton();
 - arrow.setIcon(XUtil.defaultComboBoxArrowIcon);
 - arrow.setRolloverEnabled(true);
 - arrow.setRolloverIcon(XUtil.defaultComboBoxArrowIcon_Into);
 - arrow.setBorder(null);
 - arrow.setBackground(XUtil.defaultComboBoxColor);
 - arrow.setOpaque(false);
 - arrow.setContentAreaFilled(false);
 - return arrow;
 - }
 - public void paint(Graphics g, JComponent c) {
 - hasFocus = comboBox.hasFocus();
 - Graphics2D g2 = (Graphics2D)g;
 - if (!comboBox.isEditable()) {
 - Rectangle r = rectangleForCurrentValue();
 - //重点:JComboBox的textfield 的绘制 并不是靠Renderer来控制 这点让我很吃惊.
 - //它会通过paintCurrentValueBackground来绘制背景
 - //然后通过paintCurrentValue();去绘制JComboBox里显示的值
 - paintCurrentValueBackground(g2, r, hasFocus);
 - paintCurrentValue(g2, r, hasFocus);
 - }
 - g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
 - RenderingHints.VALUE_ANTIALIAS_ON);
 - int width = (int) this.getPreferredSize(c).getWidth()
 - + arrow.getWidth() - 2;
 - int height = 0;
 - int heightOffset = 0;
 - if (comboBox.isPopupVisible()) {
 - heightOffset = 5;
 - height = (int) this.getPreferredSize(c).getHeight();
 - arrow.setIcon(XUtil.defaultComboBoxArrowIcon_Into);
 - } else {
 - heightOffset = 0;
 - height = (int) this.getPreferredSize(c).getHeight() - 1;
 - arrow.setIcon(XUtil.defaultComboBoxArrowIcon);
 - }
 - if (comboBox.isFocusable()) {
 - g2.setColor(new Color(150, 207, 254));
 - }
 - g2.drawRoundRect(0, 0, width, height + heightOffset,ARCWIDTH,ARCHEIGHT);
 - }
 - public void paintCurrentValue(Graphics g, Rectangle bounds, boolean hasFocus) {
 - Font oldFont = comboBox.getFont();
 - comboBox.setFont(XUtil.defaultComboBoxFont);
 - super.paintCurrentValue(g, bounds, hasFocus);
 - comboBox.setFont(oldFont);
 - }
 - public Dimension getPreferredSize(JComponent c) {
 - return super.getPreferredSize(c);
 - }
 - public boolean isBoundsLight() {
 - return boundsLight;
 - }
 - public void setBoundsLight(boolean boundsLight) {
 - this.boundsLight = boundsLight;
 - }
 - protected ComboPopup createPopup() {
 - ComboPopup popup = new BasicComboPopup(comboBox) {
 - protected JScrollPane createScroller() {
 - IScrollPane sp = new IScrollPane(list,
 - ScrollPaneConstants.VERTICAL_SCROLLBAR_AS_NEEDED,
 - ScrollPaneConstants.HORIZONTAL_SCROLLBAR_NEVER);
 - sp.setHorizontalScrollBar(null);
 - return sp;
 - }
 - //重载paintBorder方法 来画出我们想要的边框..
 - public void paintBorder(Graphics g){
 - Graphics2D g2 = (Graphics2D) g;
 - g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
 - RenderingHints.VALUE_ANTIALIAS_ON);
 - g2.setColor(new Color(150, 207, 254));
 - g2.drawRoundRect(0,-arrow.getHeight(),getWidth()-1,getHeight()+arrow.getHeight()-1,0,0);
 - }
 - };
 - return popup;
 - }
 - }
 
ok. 那么到这里 ComboBox这块已经end 但是似乎还有个问题存在 那就是createPopup 方法里的ScrollPane的滚动条还是有点丑.
so。.next 我们搞定 it.
1:继承 ScrollBar 并且 setUI();
2:继承 BasicScrollBarUI 我们来G出我们的效果.
paintThumb 绘制scrollbar里拖动的小box 我们先画个边框 and draw two Orange line.
paintTrack 绘制scrollbar里小box的轨迹.也就是那个啥(术语怎么说来着?拖拽滑块?).
注意:我们首先将Graphics设置透明后 在去画面板 然后立刻把Graphics设置为不透明..
这样是为了能让我们把轨迹左边边界画出来...
createIncreaseButton draw down arrowButton 小心 千万不要use JButton button = new JButton();
should use BasicArrowButton 不然你将无法click this button 并产生你想要的效果..
你猜的到 createDecreaseButton(); 方法是干什么的..(笨蛋 上面那个Button啦);
- public class IScrollBarUI extends BasicScrollBarUI{
 - public IScrollBarUI(){
 - super();
 - }
 - protected void paintThumb(Graphics g, JComponent c, Rectangle thumbBounds) {
 - int width = thumbBounds.width;
 - int height = thumbBounds.height;
 - Graphics2D g2 = (Graphics2D)g;
 - g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
 - RenderingHints.VALUE_ANTIALIAS_ON);
 - g2.translate(thumbBounds.x, thumbBounds.y);
 - g2.setColor(XUtil.defaultComboBoxBoundsColor);
 - g2.drawRoundRect(1,1,width-2, height-2,5,5);
 - g2.setColor(Color.ORANGE);
 - g2.drawLine(3,height/2,width-4,height/2);
 - g2.drawLine(3,height/2+3,width-4,height/2+3);
 - g2.translate(-thumbBounds.x, -thumbBounds.y);
 - }
 - protected void paintTrack(Graphics g, JComponent c, Rectangle trackBounds) {
 - g.setColor(XUtil.defaultComboBoxColor);
 - int x = trackBounds.x;
 - int y = trackBounds.y;
 - int width = trackBounds.width;
 - int height = trackBounds.height;
 - Graphics2D g2 = (Graphics2D)g;
 - g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
 - RenderingHints.VALUE_ANTIALIAS_ON);
 - g2.setComposite(AlphaComposite
 - .getInstance(AlphaComposite.SRC_OVER, 0.1f));
 - g2.fill3DRect(x, y, width, height, true);
 - g2.setComposite(AlphaComposite
 - .getInstance(AlphaComposite.SRC_OVER, 1f));
 - g2.setColor(XUtil.defaultComboBoxBoundsColor.brighter());
 - g2.fill3DRect(x, y, 1, height+1, true);
 - if(trackHighlight == DECREASE_HIGHLIGHT) {
 - paintDecreaseHighlight(g);
 - }
 - else if(trackHighlight == INCREASE_HIGHLIGHT) {
 - paintIncreaseHighlight(g);
 - }
 - }
 - protected JButton createIncreaseButton(int orientation) {
 - JButton button = new BasicArrowButton(orientation){
 - public void paint(Graphics g) {
 - Graphics2D g2 = (Graphics2D)g;
 - g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
 - RenderingHints.VALUE_ANTIALIAS_ON);
 - g2.setColor(XUtil.defaultComboBoxBoundsColor);
 - g2.drawLine(0,0,0,getHeight());
 - g2.drawLine(0,0,getWidth(),0-1);
 - g2.drawImage(((ImageIcon)XUtil.defaultComboBoxArrowIcon_Into).getImage(),-1,0,null);
 - }
 - };
 - button.setOpaque(false);
 - return button;
 - }
 - protected JButton createDecreaseButton(int orientation) {
 - JButton button = new BasicArrowButton(orientation){
 - public void paint(Graphics g) {
 - Graphics2D g2 = (Graphics2D)g;
 - g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
 - RenderingHints.VALUE_ANTIALIAS_ON);
 - g2.setColor(XUtil.defaultComboBoxBoundsColor);
 - g2.drawLine(0,0,0,getHeight());
 - g2.drawLine(0,getHeight()-1,getWidth(),getHeight());
 - g2.drawImage(((ImageIcon)XUtil.defaultComboBoxArrowIcon_Into).getImage(),-1,0,null);
 - }
 - };
 - button.setOpaque(false);
 - return button;
 - }
 - }