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如何还原当前JTree的状态?

k_k_grass

发贴: 29
积分: 0

于 2003-03-26 21:02

/*1.run the program,and double click the child01 node and rename it which takes with carriage return
2.click the save button to save it;
3.I wanna get back the previous information with click open button,even i try to get it back,but it won't response to the TreeSelectionEvent,that is also my concern here...
thanks advance for any of your idea
*/
import java.util.*;
import java.io.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.tree.*;
import javax.swing.*;
import javax.swing.event.*;
class Tree1 extends JFrame implements Serializable{
JTree tree;
Hashtable h;
JPanel panel;
JScrollPane scroll;
JButton btnOpen,btnSave;
JLabel lblStatus;
int count=0;//child tree node counts;
String[] s1={"child"+count};
static Tree1 treeApp;
public Tree1(){
//initialize the tree which constructed with hashtable
h=new Hashtable();
h.put("root",s1);
tree=new JTree Cool

;
tree.setEditable(true);
panel=new JPanel();
scroll=new JScrollPane(tree);
btnOpen=new JButton("open");
btnSave=new JButton("save");
lblStatus=new JLabel();
tree.addTreeSelectionListener(new TreeSelectionListener() {
public void valueChanged(TreeSelectionEvent e) {
DefaultMutableTreeNode node = (DefaultMutableTreeNode)tree.getLastSelectedPathComponent();
if (node == null)
return;
Object nodeInfo = node.getUserObject();
lblStatus.setForeground(Color.red);
lblStatus.setText(nodeInfo.toString()+"Selected");
validate();//re-layout & repaint
repaint();
}

});
btnOpen.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
scroll.remove(tree);
ObjectInputStream is=null;
try{
is=new ObjectInputStream(new FileInputStream(new File("os.txt")));
Hashtable hB=(Hashtable)is.readObject();
JTree treeB=(JTree)is.readObject();
scroll.add(tree Black Eye

;
treeB.setRootVisible(true);
is.close();
validate();
repaint();
JOptionPane.showConfirmDialog(null,"opened the previous' tree","open",JOptionPane.PLAIN_MESSAGE);
}
catch(Exception et){System.out.println("wrong opening object");}
}
});
btnSave.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent event){
ObjectOutputStream os=null;
try{
os=new ObjectOutputStream(new FileOutputStream(new File("os.txt")));
os.writeObject Cool

;
os.writeObject(tree);
JOptionPane.showConfirmDialog(null,"saved this tree","save",JOptionPane.PLAIN_MESSAGE);
}
catch(Exception e){System.out.println("error write object");}
finally{
try{
os.close();
}
catch(Exception e){System.out.println("error on close");}
}
}
});
setContentPane(panel);
panel.setLayout(new BorderLayout());
panel.add(scroll,BorderLayout.WEST);
JPanel btnPanel=new JPanel();
btnPanel.add(btnOpen);
btnPanel.add(btnSave);
panel.add(btnPanel,BorderLayout.NORTH);
panel.add(lblStatus,BorderLayout.SOUTH);
setSize(300,400);
show();
this.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
}

public static void main(String[] args){
treeApp=new Tree1();
}
}

话题树型展开

人气	标题	作者	字数	发贴时间
2997	如何还原当前JTree的状态?	k_k_grass	3029	2003-03-26 21:02
2255	Re:如何还原当前JTree的状态?	bujinwang	4631	2003-03-27 11:18
2370	Re:如何还原当前JTree的状态?	bujinwang	4218	2003-03-27 11:20

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