关于Swing 控件覆盖问题

[缸缸]

点+按钮时候上面的文本域会变高并且把下面那个文本域覆盖了，如何做到不覆盖，下面的文本域自动下移

package com.myframe;


import javax.swing.*;
import java.awt.*;
import java.awt.event.*;

public class FrameTest extends JFrame{
public FrameTest() {
}
public static void main(String args[]){
SimpleFrame frame = new SimpleFrame();
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
//frame.pack();
frame.setVisible(true);
}
}

class SimpleFrame extends JFrame{
public static final int DEFAULT_WIDTH = 300;
public static final int DEFAULT_HEITH = 400;
public static final int DEFAULTMAX_HEIGHT = 120;
private JPanel panel;
private JTextArea textArea,textArea1;
private JScrollPane scrollPanel,scrollPanel1;
private JButton bigbutton;
private JToolBar bar;

public SimpleFrame(){
setTitle("框框");
setSize(DEFAULT_WIDTH,DEFAULT_HEITH);

bar = new JToolBar();
bigbutton = new JButton("+");
bigbutton.addActionListener(new AddAction());

bar.add(bigbutton);
add(bar,BorderLayout.NORTH);

panel = new JPanel();
add(panel);
bar.add(bigbutton);

textArea = new JTextArea();
textArea.setRows(5);
textArea.setColumns(20);
textArea.setLineWrap(true);
scrollPanel = new JScrollPane(textArea);
panel.add(scrollPanel);

textArea1 = new JTextArea();
textArea1.setRows(5);
textArea1.setColumns(20);
textArea1.setLineWrap(true);
scrollPanel1 = new JScrollPane(textArea1);
panel.add(scrollPanel1);

JPopupMenu popup = new JPopupMenu();
textArea.setComponentPopupMenu(popup);
JMenuItem item = new JMenuItem("变大");
popup.add(item);
item.addActionListener(new AddAction());
textArea.add(popup);
}

private class AddAction implements ActionListener{
public void actionPerformed(ActionEvent event){
int i= scrollPanel.getHeight();
if(i<DEFAULTMAX_HEIGHT){
scrollPanel.setBounds(
new Rectangle(scrollPanel.getX(), scrollPanel.getY(),
scrollPanel.getWidth(),
scrollPanel.getHeight() + 40));
scrollPanel.updateUI();
}
}
}
}

[horizonlyhw]

import javax.swing.*; 
import java.awt.*; 
import java.awt.event.*; 

public class FrameTest extends JFrame{ 
    public FrameTest() { 
    } 
    public static void main(String args[]){ 
        SimpleFrame frame = new SimpleFrame(); 
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); 
        //frame.pack(); 
        frame.setVisible(true); 
    } 
} 

class SimpleFrame extends JFrame{ 
    public static final int DEFAULT_WIDTH = 300; 
    public static final int DEFAULT_HEITH = 400; 
    public static final int DEFAULTMAX_HEIGHT = 130; 
    private JPanel panel; 
    private JTextArea textArea,textArea1; 
    private JScrollPane scrollPanel,scrollPanel1; 
    private JButton bigbutton; 
    private JToolBar bar; 

    public SimpleFrame(){ 
        setTitle("dfsd"); 
        setSize(DEFAULT_WIDTH,DEFAULT_HEITH); 

        bar = new JToolBar(); 
        bigbutton = new JButton("+"); 
        bigbutton.addActionListener(new AddAction()); 

        bar.add(bigbutton); 
        add(bar,BorderLayout.NORTH); 

        panel =  new JPanel(); 
        add(panel); 
        bar.add(bigbutton); 

        panel.setLayout(null);
        
        textArea =  new JTextArea(); 
        textArea.setRows(5); 
        textArea.setColumns(20); 
        textArea.setLineWrap(true); 
        scrollPanel = new JScrollPane(textArea); 
        scrollPanel.setBounds(new Rectangle(20,20,100,50));
        panel.add(scrollPanel); 
        
        textArea1 = new JTextArea(); 
        textArea1.setRows(5); 
        textArea1.setColumns(20); 
        textArea1.setLineWrap(true); 
        scrollPanel1 = new JScrollPane(textArea1); 
        scrollPanel1.setBounds(new Rectangle(20,100,100,50));
        panel.add(scrollPanel1); 

        JPopupMenu popup = new JPopupMenu(); 
        textArea.setComponentPopupMenu(popup); 
        JMenuItem item = new JMenuItem("變大"); 
        popup.add(item); 
        item.addActionListener(new AddAction()); 
        textArea.add(popup); 
    } 

    private class AddAction implements ActionListener{ 
        public void actionPerformed(ActionEvent event){ 
            int i= scrollPanel.getHeight(); 
            if(i <DEFAULTMAX_HEIGHT){ 
                scrollPanel.setBounds( 
                        new Rectangle(scrollPanel.getX(), scrollPanel.getY(), 
                                      scrollPanel.getWidth(), 
                                      scrollPanel.getHeight() + 40)); 
                scrollPanel.updateUI(); 
                if (scrollPanel.getY()+ scrollPanel.getHeight()> scrollPanel1.getY()){
                	scrollPanel1.setBounds(new Rectangle(scrollPanel1.getX(), scrollPanel.getY()+scrollPanel.getHeight()+20,scrollPanel1.getWidth(), 
                            scrollPanel1.getHeight()));
                	panel.add(scrollPanel1);
                }
                scrollPanel1.updateUI(); 
          } 
      } 
    } 
} 

[缸缸]

谢大虾，你是重新绘制了下面那个文本改变它的位置。但是事实上我的程序里下面还有好几个文本框，这样做就不合适了。

[cowputer]

别用null布局，不就省了好多麻烦吗

[horizonlyhw]

[Quote=引用 3 楼 cowputer 的回复:]
别用null布局，不就省了好多麻烦吗
[/Quote]

嗯 這樣蠻好的～～

[缸缸]

我正是想通过布局方式让下面的框框给“挤”下来，可是对布局不是很懂。

[horizonlyhw]

這個用box應該挺合適 你找個小例子做做吧 我不常用布局～ 都是用null～～ 也不熟悉

[chaosking]

布局的话，要想用好SWING，GridBagLagout是必须要熟悉的。推荐LZ去看下这方面的资料。不过LZ的问题用Grid就可以实现了