Roland,
I don't know if I am using the code you suggested improperly, so
I have a question.
When I request tabBounds.height, that provides the height of the
panel within the tabbedpane. Is it supposed to provide me with
the height of the tab itself or of the panel?
Thanks,
Todd
It should indicate the height of the tab itself, not of the panel on the
tab.
<ssccexample>
import java.awt.*;
import java.awt.event.*;
import java.util.Date;
import javax.swing.*;
import javax.swing.plaf.TabbedPaneUI;
import javax.swing.text.*;
public class TabbedPaneTest extends JFrame {
private static final long serialVersionUID = 2594638227854923552L;
private static final int NUM_OF_TABS = 7;
/**
* Main method which starts the TabbedPaneTest application.
*
* @param args command line arguments
*/
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
TabbedPaneTest application = new TabbedPaneTest();
application
.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
application.setSize(480, 320);
application.setVisible(true);
}
});
}
private JButton jBtnClearLog;
private JButton jBtnShowBounds;
private JPanel jButtonPanel;
private JCheckBox jChkIconsOnTabs;
private JPanel jContentPane;
private JTabbedPane jTabbedPane;
private Document logDocument;
/**
* This is the default constructor
*/
public TabbedPaneTest() {
initialize();
postInitialize();
}
/**
* Returns an icon for the tab with the given
* <code>tabIndex</code>.
*
* @param tabIndex
* @return an icon for the tab with the given
* <code>tabIndex</code>
*/
private Icon getIconForTab(int tabIndex) {
switch (tabIndex % 5) {
case 0:
return UIManager.getIcon("FileView.computerIcon");
case 1:
return UIManager.getIcon("FileView.directoryIcon");
case 2:
return UIManager.getIcon("FileView.fileIcon");
case 3:
return UIManager.getIcon("FileView.hardDriveIcon");
case 4:
default:
return UIManager.getIcon("FileView.floppyDriveIcon");
}
}
/**
* This method initializes jBtnClearLog
*
* @return javax.swing.JButton
*/
private JButton getJBtnClearLog() {
if (jBtnClearLog == null) {
jBtnClearLog = new JButton();
jBtnClearLog.setText("Clear log");
jBtnClearLog.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
Document logDoc = getLogDocument();
try {
logDoc.remove(0, logDoc.getLength());
} catch (BadLocationException ex) {
ex.printStackTrace();
}
}
});
}
return jBtnClearLog;
}
/**
* This method initializes jPrintBoundsButton
*
* @return javax.swing.JButton
*/
private JButton getJBtnShowBounds() {
if (jBtnShowBounds == null) {
jBtnShowBounds = new JButton();
jBtnShowBounds.setText("Print tab bounds");
jBtnShowBounds.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
JTabbedPane tp = getJTabbedPane();
int tabCount = tp.getTabCount();
TabbedPaneUI ui = tp.getUI();
println(new Date());
for (int i = 0; i < tabCount; i++) {
Rectangle tabBounds = ui.getTabBounds(tp, i);
println("Bounds of tab " + (i + 1) + ": "
+ tabBounds);
}
println("");
}
private void println(Object s) {
System.out.println(s);
Document logDoc = getLogDocument();
try {
logDoc.insertString(logDoc.getLength(), s
+ "\n", null);
} catch (BadLocationException ex) {
ex.printStackTrace();
}
}
});
}
return jBtnShowBounds;
}
/**
* This method initializes jButtonPanel
*
* @return javax.swing.JPanel
*/
private JPanel getJButtonPanel() {
if (jButtonPanel == null) {
jButtonPanel = new JPanel();
jButtonPanel.setLayout(new FlowLayout());
jButtonPanel.add(getJBtnShowBounds(), null);
jButtonPanel.add(getJBtnClearLog(), null);
jButtonPanel.add(getJChkIconsOnTabs(), null);
}
return jButtonPanel;
}
/**
* This method initializes jIconsOnTabs
*
* @return javax.swing.JCheckBox
*/
private JCheckBox getJChkIconsOnTabs() {
if (jChkIconsOnTabs == null) {
jChkIconsOnTabs = new JCheckBox();
jChkIconsOnTabs.setText("Icons on tabs");
jChkIconsOnTabs.setSelected(true);
jChkIconsOnTabs.addActionListener(new ActionListener() {
public void actionPerformed(ActionEvent e) {
updateTabIcons(getJTabbedPane(), jChkIconsOnTabs
.isSelected());
}
});
}
return jChkIconsOnTabs;
}
/**
* This method initializes jContentPane
*
* @return javax.swing.JPanel
*/
private JPanel getJContentPane() {
if (jContentPane == null) {
jContentPane = new JPanel();
jContentPane.setLayout(new BorderLayout());
jContentPane.setSize(new Dimension(286, 188));
jContentPane.add(getJTabbedPane(), BorderLayout.CENTER);
jContentPane.add(getJButtonPanel(), BorderLayout.NORTH);
}
return jContentPane;
}
/**
* This method initializes jTabbedPane
*
* @return javax.swing.JTabbedPane
*/
private JTabbedPane getJTabbedPane() {
if (jTabbedPane == null) {
jTabbedPane = new JTabbedPane();
// this is the document used for the text area on each
// tab
Document sharedDocument = getLogDocument();
// create and add NUM_OF_TABS tabs
for (int i = 0; i < NUM_OF_TABS; i++) {
final int tabNumber = i + 1;
JLabel tabLabel = new JLabel();
tabLabel.setText("This is Tab #" + tabNumber);
tabLabel.setHorizontalAlignment(JLabel.CENTER);
JTextArea textArea = new JTextArea();
textArea.setDocument(sharedDocument);
JScrollPane textAreaScrollPane = new JScrollPane();
textAreaScrollPane.setViewportView(textArea);
JPanel tabPanel = new JPanel();
tabPanel.setLayout(new BorderLayout());
tabPanel.add(tabLabel, BorderLayout.NORTH);
tabPanel.add(textAreaScrollPane, BorderLayout.CENTER);
jTabbedPane.addTab("Tab " + tabNumber, null,
tabPanel, null);
}
}
return jTabbedPane;
}
private Document getLogDocument() {
if (logDocument == null) {
logDocument = new PlainDocument();
}
return logDocument;
}
/**
* This method initializes the user interface.
*/
private void initialize() {
this.setSize(400, 300);
this.setContentPane(getJContentPane());
this.setTitle("Tabbed Pane Test");
}
/**
* This method takes care of correctly showing state of UI
* after it has been initialized.
*/
private void postInitialize() {
// make sure the tab icons match the state of the checkbox
updateTabIcons(getJTabbedPane(), getJChkIconsOnTabs()
.isSelected());
}
/**
* Updates the icons of each tab of the given
* <code>tabbedPane</code>. If <code>showIcons</code> is
* <code>false</code>, the icon of each tab of
* <code>tabbedPane</code> is removed. If
* <code>showIcons</code> is <code>true</code>, an icon
* is added on each tab.
*
* @param tabbedPane
* @param showIcons
*/
private void updateTabIcons(JTabbedPane tabbedPane,
boolean showIcons) {
int tabCount = tabbedPane.getTabCount();
for (int i = 0; i < tabCount; i++) {
if (showIcons) {
// set the icon
tabbedPane.setIconAt(i, getIconForTab(i));
} else {
// remove icon
tabbedPane.setIconAt(i, null);
}
}
}
}
