一直都是一只菜鸟..不管别人怎么说.
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();
}
}
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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;
}
}
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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;
}
}
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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;
}
}
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