为啥重绘JButton后加入到一个JPanel中显示就不正常勒呢
日期：2014-05-20 浏览次数：20729 次
为什么重绘JButton后加入到一个JPanel中显示就不正常勒呢
重绘JButton的代码paintComponent如下：
初学java，里面很多都是照着网上写的。单独加入到JFrame是显示正常，可是一加入到JPanel中背景只能显示左上部分，文字显示正常（传不了图啊。。。。）
不知道原因为何，希望知道的友友解释下
附上整个重绘代码：
重绘JButton的代码paintComponent如下：
- Java code
public void paintComponent(Graphics g) {
Graphics2D g2 = (Graphics2D)g ;
Paint oldPaint = g2.getPaint() ;
if(isEntered){
if (getModel().isArmed()) {
g2.setColor(bacClick);
} else
g2.setColor(bacNormal);
GradientPaint p = new GradientPaint(0,0,
new Color(0xFFFFFF), 0, 2, bacNormal);
g2.setPaint(p) ;
g2.fillRoundRect(0, 0, getWidth()- 1, getHeight() /2+10, 5, 5);
GradientPaint pInigel = new GradientPaint(0,getHeight()/2-10,bacNormal,0,getHeight(),new Color(0xFFFFFF)) ;
g2.setPaint(pInigel) ;
g2.fillRoundRect(0, getHeight()/2-5, getWidth()- 1, getHeight(), 5, 5);
}
g2.setFont(new Font("方正舒体", 0, 30));
if (getModel().isArmed()) {
g2.setColor(bacNormal);
} else
if(isEntered)
g2.setColor(Color.YELLOW) ;
else
g2.setColor(foreGround);
g2.drawString(text,1, getHeight()/ 2 + 9);
g2.setPaint(oldPaint) ;
super.paintComponent(g);
}
初学java，里面很多都是照着网上写的。单独加入到JFrame是显示正常，可是一加入到JPanel中背景只能显示左上部分，文字显示正常（传不了图啊。。。。）
不知道原因为何，希望知道的友友解释下
附上整个重绘代码：
- Java code
package xsb.weiwei;
import javax.swing.* ;
import java.awt.* ;
import java.awt.event.* ;
import java.awt.geom.RoundRectangle2D;
public class XJButton extends JButton implements MouseListener {
private String text;
private Color bacNormal;
private Color foreGround;
private Color bacClick;
private Shape shape = null;
private int height ;
private boolean isEntered ;
public XJButton(String text) {
this.text = text;
bacNormal = new Color(0xFFB6C1);
foreGround = new Color(0x000000);
bacClick = Color.GRAY;
setContentAreaFilled(false);
addMouseListener(this);
isEntered = false ;
height = 45 ;
}
public void paintComponent(Graphics g) {
Graphics2D g2 = (Graphics2D)g ;
Paint oldPaint = g2.getPaint() ;
if(isEntered){
if (getModel().isArmed()) {
g2.setColor(bacClick);
} else
g2.setColor(bacNormal);
GradientPaint p = new GradientPaint(0,0,
new Color(0xFFFFFF), 0, 2, bacNormal);
g2.setPaint(p) ;
g2.fillRoundRect(0, 0, getWidth()- 1, getHeight() /2+10, 5, 5);
GradientPaint pInigel = new GradientPaint(0,getHeight()/2-10,bacNormal,0,getHeight(),new Color(0xFFFFFF)) ;
g2.setPaint(pInigel) ;
g2.fillRoundRect(0, getHeight()/2-5, getWidth()- 1, getHeight(), 5, 5);
}
g2.setFont(new Font("方正舒体", 0, 30));
if (getModel().isArmed()) {
g2.setColor(bacNormal);
} else
if(isEntered)
g2.setColor(Color.YELLOW) ;
else
g2.setColor(foreGround);
g2.drawString(text,1, getHeight()/ 2 + 9);
g2.setPaint(oldPaint) ;
super.paintComponent(g);
}
public void paintBorder(Graphics g) {
if(isEntered){
g.setColor(Color.BLACK);
g.drawRoundRect(0, 0, getWidth()-1,getHeight()-1, 20, 20);
}
}
public boolean contains(int x, int y) {
if (shape == null || shape.getBounds().equals(getBounds())) {
shape = new RoundRectangle2D.Float(0, 0, getWidth(), getHeight(),
20, 20);
}
return shape.contains(x, y);
}
@Override
public void mouseClicked(MouseEvent arg0) {
// TODO Auto-generated method stub
}
@Override
public void mouseEntered(MouseEvent arg0) {
// TODO Auto-generated method stub
isEntered = true ;
setCursor(new Cursor(Cursor.HAND_CURSOR)) ;
repaint() ;
}
@Override
public void mouseExited(MouseEvent arg0) {
// TODO Auto-generated method stub
isEntered = false ;
repaint() ;
}
@Override
public void mousePressed(MouseEvent arg0) {
// TODO Auto-generated method stub
}
@Override
public void mouseReleased(MouseEvent arg0) {
// TODO Auto-generated method stub
}
public int getWidth(){
return text.length()*35 ;
}
public int getHeight(){
return height ;
}
public String getString(){
return text;
}
public static void main(String[] args){
JFrame jfm = new JFrame("") ;
jfm.setSize(200,200) ;
jfm.setLocation(new Point(400,400)) ;
XJButton x = new XJButton("尝试") ;
x.setOpaque(false) ;
jfm.getContentPane().add(x) ;
jfm.setVisible(true) ;
jfm.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE) ;
}
}
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