Posted on 2008-03-08 00:50
kooyee 閱讀(1886)
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Swing/Applet
tab change 事件， 使用到StateChanged Event
import java.awt.*;
import java.awt.event.*;
import java.util.StringTokenizer;
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;
import javax.swing.text.JTextComponent;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.TreePath;
public class SelectableTree extends JFrame
implements TreeSelectionListener,ChangeListener
{
protected Component makeJTreePanel(JTree tree)
{
JPanel panel = new JPanel(false);
panel.setLayout(new GridLayout(1, 1));
panel.add(new JScrollPane(tree));
return panel;
}
protected JTree makeJTree(String text)
{
DefaultMutableTreeNode root
= new DefaultMutableTreeNode(text);
for(int i = 0; i < 4; i++)
{
DefaultMutableTreeNode child
= new DefaultMutableTreeNode(text + i);
for(int j = 0; j < 4; j++)
child.add(new DefaultMutableTreeNode(text + i + j));
root.add(child);
}
JTree tree = new JTree(root);
tree.addTreeSelectionListener(this);
return tree;
}
public void valueChanged(TreeSelectionEvent event)
{
String temp = event.getPath().toString();
for(StringTokenizer token = new StringTokenizer(temp, ","); token.hasMoreTokens();)
temp = token.nextToken();
textArea.setText("Current Selection: " + temp.substring(0, temp.length() - 1));
}
/** *//**Sole method of ChangeListener*/
public void stateChanged(ChangeEvent e)
{
DefaultSingleSelectionModel dSM
= (DefaultSingleSelectionModel)e.getSource();
int index = dSM.getSelectedIndex();
String tabName = tabbedPane.getTitleAt(index);
/** *//** I imagine you will do more than this*/
if(textArea != null)
textArea.setText("Tab Selected: " + tabName);
}
/** *//****************************************/
public SelectableTree()
{
super("ECHO Service Demo");
//WindowUtilities.setNativeLookAndFeel();
//addWindowListener(new ExitListener());
setDefaultCloseOperation(EXIT_ON_CLOSE);
Container content = getContentPane();
tabbedPane = new JTabbedPane();
/** *//**add ChangeListener to Model*/
tabbedPane.getModel().addChangeListener(this);
/** *//*******************************************/
Component panel1 = makeJTreePanel(makeJTree("Taxonomy1"));
tabbedPane.addTab("Taxonomy1", null, panel1, null);
tabbedPane.setSelectedIndex(0);
Component panel2 = makeJTreePanel(makeJTree("Taxonomy2"));
tabbedPane.addTab("Taxonomy2", null, panel2, null);
Component panel3 = makeJTreePanel(makeJTree("Taxonomy3"));
tabbedPane.addTab("Taxonomy3", null, panel3, null);
Component panel4 = makeJTreePanel(makeJTree("Taxonomy4"));
tabbedPane.addTab("Taxonomy4", null, panel4, null);
content.add(tabbedPane, "Center");
textArea = new JTextArea("Services of Current Category: NONE");
content.add(textArea, "South");
setSize(350, 375);
setVisible(true);
}
public static void main(String args[])
{
new SelectableTree().setVisible(true);
}
private JTabbedPane tabbedPane;
private JTextArea textArea;
}