JTabbedPane the focus works wrong...
Hi, the situation is this:
I have a MDI application bases in Tabs, like Opera or Netscape 7.x.
When I need close a Tab can do it with: remove ().
each Tab contains the same components (textareas, labels, etc)
however when i try to use the focus to edit an particular textarea
in a frame to capture its text (getText) process and after show
the result in this same textarea i note that if the selected tab is the last one it works but if I choose the last (or any other) and other
(like normal activity) the textarea afected is the textareaof the last tab. this happen when other tab (different to the last) is selected.
And the problem of focus (al least the normal) is worked with: setSelectedIndex with an ActionListener.
Please help me.
Thannks.
Try using a ComponentListener instead:
JTextArea ta = new JTextArea();
ta.addComponentListener(
new ComponentAdapter()
public void componentShown(ComponentEvent evt)
evt.getComponent().requestFocus();
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JTabbedPane - traversing focus through tabs
I would like to have focus traverse through tabs in a JTabbedPane. That is, when the focus is on the last component of a tab, hitting the key for forward focus traverse should bring up the next tab and focus on the first component on that tab. I'm already using a custom FocusTraversalPolicy on the panel containing the JTabbedPane, which handles focus traversal between the components on the tabs. This policy has no knowledge of which tab a particular component is on.
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Following code looks ugly:
order.add(tf1);
order.add(tf2);
parentsForward.put(p,tf1);
parentsBackward.put(p,b2);but this is a concept demonstration only, you can hide this piece inside TraversalPolicy implementation.
Here is the full code:
import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
public class TabbedFocusExample extends JFrame {
public TabbedFocusExample() throws HeadlessException {
super("Tabbed Focus Test");
setLayout(new FlowLayout());
JPanel p;
final JTabbedPane tp = new JTabbedPane();
final JTextField tf1 = new JTextField(20);
final JTextField tf2 = new JTextField(20);
final JCheckBox cb1 = new JCheckBox("Option 1");
final JCheckBox cb2 = new JCheckBox("Option 2");
final JButton b1 = new JButton("Click me!");
final JButton b2 = new JButton("Press me!");
//stores real components, no container
Vector<Component> order = new Vector<Component>();
//stores (container,first_component_in_this_container) pair
Map<Component,JComponent> parentsForward = new HashMap<Component,JComponent>();
//stores (container,last_component_in_previous_container) pair
Map<Component,JComponent> parentsBackward = new HashMap<Component,JComponent>();
p = new JPanel(new FlowLayout());
p.add(tf1);
p.add(tf2);
tp.addTab("Tab 1",p);
order.add(tf1);
order.add(tf2);
parentsForward.put(p,tf1);
parentsBackward.put(p,b2);
p = new JPanel(new FlowLayout());
p.add(cb1);
p.add(cb2);
tp.addTab("Tab 2", p);
order.add(cb1);
order.add(cb2);
parentsForward.put(p,cb1);
parentsBackward.put(p,tf2);
p = new JPanel(new FlowLayout());
p.add(b1);
p.add(b2);
tp.addTab("Tab 3", p);
order.add(b1);
order.add(b2);
parentsForward.put(p,b1);
parentsBackward.put(p,cb2);
setFocusTraversalPolicy(new MyOwnFocusTraversalPolicy(order,parentsBackward,
parentsForward,tp));
add(tp);
pack();
setDefaultCloseOperation(EXIT_ON_CLOSE);
public static void main(String[] args) {
new TabbedFocusExample().setVisible(true);
public class MyOwnFocusTraversalPolicy extends FocusTraversalPolicy {
private Vector<Component> order;
private JTabbedPane tabbedPane;
private Map<Component, JComponent> parentsForward;
private Map<Component, JComponent> parentsBackward;
public MyOwnFocusTraversalPolicy(Vector<Component> order,Map<Component,JComponent> parentsF,
Map<Component,JComponent> parentsB,JTabbedPane jtb) {
this.order = order;
this.tabbedPane=jtb;
this.parentsForward = parentsF;
this.parentsBackward = parentsB;
public Component getComponentAfter(Container focusCycleRoot,
Component aComponent) {
JComponent nextComp = parentsForward.get(aComponent);
if(nextComp!=null){ //aComponent is Container return first component in this Container
return nextComp;
int idx = (order.indexOf(aComponent) + 1) % order.size();
nextComp = (JComponent)order.get(idx);
int indexCurrent = tabbedPane.indexOfComponent(((JComponent)aComponent).getParent());
int indexNext = tabbedPane.indexOfComponent(nextComp.getParent());
if(indexNext!=indexCurrent){ //if next Component sits in next tab go to next tab
tabbedPane.setSelectedComponent(nextComp.getParent());
return nextComp;
//same stuff but in opposite direction
public Component getComponentBefore(Container focusCycleRoot,
Component aComponent) {
JComponent prevComp= parentsBackward.get(aComponent);
if(prevComp!=null){
return prevComp;
int idx = order.indexOf(aComponent) - 1;
if (idx < 0) {
idx = order.size() - 1;
prevComp = (JComponent)order.get(idx);
int indexCurrent = tabbedPane.indexOfComponent(((JComponent)aComponent).getParent());
int indexPrevious = tabbedPane.indexOfComponent(prevComp.getParent());
if(indexPrevious!=indexCurrent){
tabbedPane.setSelectedComponent(prevComp.getParent());
return prevComp;
public Component getDefaultComponent(Container focusCycleRoot) {
return order.get(0);
public Component getLastComponent(Container focusCycleRoot) {
return order.lastElement();
public Component getFirstComponent(Container focusCycleRoot) {
return order.get(0);
} -
Can someone explain how to set the focus to a component
Hello,
What is the best way to ensure that a component gets the focus with code. I have tried requestFocus and requestFocusInWindow and none of them seems to do there work. The frame containing the components that should get the focus is displayed, the component is focusable so that is not the problem. What I found out is that if the component is deep in a nesting of panes (where the top pane is in the frame) is that calling requestFocus or requestFocusInWindow does not give the component where this focus is called on the focus but either the pane that contains it, one of the parent panes of this pane or one of the components in these panes, in almost all cases the component requesting the focus does not get the focus at all. I always have to write a work around in defining a focus listener for all these panes that transfer the focus back to the component that requested the focus originally, I can't believe that this is the way to ensure that a component has the focus via code. I have searched for documentation but found nothing on what requestFocus(inWindow) is actually dooing (a lot about focus traversibility but I don't want to control this, just make sure that a component gets the focus).
Again I'm pretty sure that the toplevel window is activated and that the component that requested the focus is focusable (I had created a derived version of the DefaultFocusManager that showed who has focus). Personally I think (and I'm not alone if you do a search in this forum on focus management) that there is either a big problem in the documentation of focus management or that it is still not possible to even try to set the focus on a component in a easy way.
MarcHello,
thanks for your reply, here is some example code that illustrates the problem I have (the actual code is to big to show here, which is the raison why I did not posted it here). The code wil create a frame with a JPanel with a JTextField, a 'New' Jbutton and a 'Delete' Jbutton, a tabbed pane in the center ('New' will create a new JPanel, add it to the tabbed pane and set the focus on it, either by calling RequestFocusInWindow() directly or by calling it via InvokeLater (someone on this forum suggested to use this). I changed also the focusmanager to show the component that has the focus when you type something. To test compile and run the program (either with a call to requesteFocusInWindow directly or indirectly (by changing the comments), on my system I get the following behaviour:
1. requestFocusInWindow called directly
Start program en type, the tabbed pane has the focus
Press New and type something, a button has the focus not the created panel
Press New again and type something, a button has the focus not the created panel
2. requestFocusInWindow be called indirectly
Start program and type, the tabbed pane has the focus
Press New and type, the created panel has the focus (I thought at one moment that I had found the solution there, but alas ...)
Press New again and type something, a button has again the focus.
Note that with my real program it is not always a button that will have the focus, sometimes it is a combobox or a TextField (I tried to get this with the example code (the JTextField) but did not succeed.
Hopes this clarify the problem a little bid, what I want is when the window is visible to set focus on newly created panes (or in the real program on the panel that is selected via the tabbed pane or via a key combination to shift the focus between the panels) but requestFocusInWindow seems to behave unpredicatable. I can't imagine that what I see is a bug so I must make some assumptions which are not valid but I don't see them, btw listening on the WindowListener is I think not the solution because the frame is already displayed when I want to set the focus and I do not use a modal dialog box.
The example code follows here
Marc
* Main.java
* Created on December 21, 2004, 8:58 AM
package testfocus;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
* @author marc
public class Main
static int counter;
/** Creates a new instance of Main */
public Main()
* @param args the command line arguments
public static void main(String[] args)
JFrame frm=new JFrame();
JPanel content=new JPanel();
frm.setContentPane(content);
final JTabbedPane paneContainer=new JTabbedPane();
JPanel bar=new JPanel();
JButton create=new JButton(new AbstractAction("New")
public void actionPerformed(ActionEvent ev)
counter++;
final JPanel pnl=new JPanel();
pnl.setName("test"+counter);
paneContainer.add(pnl);
pnl.setFocusable(true);
pnl.requestFocusInWindow();
/* Either use this or the previous line
SwingUtilities.invokeLater(new Runnable()
public void run()
pnl.requestFocusInWindow();
JButton delete=new JButton(new AbstractAction("Delete")
public void actionPerformed(ActionEvent ev)
int i=paneContainer.getComponentCount()-1;
if (i>=0)
paneContainer.remove(i);
JTextField dummy=new JTextField("Test");
bar.add(dummy);
bar.add(create);
bar.add(delete);
content.setLayout(new BorderLayout());
content.add(bar,BorderLayout.SOUTH);
content.add(paneContainer,BorderLayout.CENTER);
frm.setSize(300,400);
FocusManager.setCurrentManager(new DefaultFocusManager()
public void processKeyEvent(Component component,KeyEvent ev)
System.out.println("Focus owner"+getFocusOwner());
super.processKeyEvent(component,ev);
frm.setVisible(true);
} -
Open JTabbedPane with focus in tab
I have a swing standalone app where general navigation is managed with something like this:
private void addNewComponent(JComponent component) {
JComponent panel = main.getDesktopComponent();
main.setMainTittle(GlobalOptions.getTittle());
panel.removeAll();
panel.add(component, BorderLayout.CENTER);
component.requestFocus();
panel.validate();
panel.repaint();
} //EOF addNewComponentOne of this changed central panel's components is a JTabbedPane
This pane has 3 tabs, each with full tree of containers and components.
The problem is that when central app panel shows the JTabbedPane, the only way to focus in a component is by mouse click, after that i can use tab key to switch between components, including tabs from pane.
I cant find a way to force focus so mouse click is not necesary.
The component parameter in previous code has been a container in any part of app code I've seen it, so far, somewhere in each of this containers is a back button to mantain consistent the navigation. But I need to keep anytime the tab key navigation.
Also while tab key is not working sometimes hot keys neither work, so fast keyboard navigation crashes completely.
Is there a way I can fix this? tabs in JTabbedPane cant be selected as components, requestFocus in other components doesnt work, searching in the net shows posts with similar problems but says that it's a bug and need to change to jdk 1.5, I prefer to keep 1.4.2 version at least for a while since app is spreaded to many people and i dont control that.
Thanks in advance for the help.You need to look into the new focus system. Focus always defaults the root of the default FocusTraversalPolicy. You need to define a policy. Then when the window opens focus will default to the tab if defined correctly.
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JTabbedPane loosing focus when switching tabs
When there are tiered JTabbedPanes and focus in one of the children and the tabbed is switched focus will go to the first component in the frame.
Is there a work around to keep the focus at least on the jtabbedpane?
Is this a know bug? anyone heard of this before?
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Here is an example:
import javax.swing.*;
import java.awt.*;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
public class TabPaneTest extends JFrame {
public TabPaneTest() {
JButton focusStealer = new JButton("Look at me!");
focusStealer.addFocusListener(new FocusListener() {
public void focusGained(FocusEvent e) {
System.out.println("I TOOK FOCUS! W00t!");
public void focusLost(FocusEvent e) {
//To change body of implemented methods use File | Settings | File Templates.
JTabbedPane tabbedPane = createTabbedPane(0);
getContentPane().add(focusStealer, BorderLayout.NORTH);
getContentPane().add(tabbedPane, BorderLayout.CENTER);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(300, 200);
setLocation(400, 200);
setVisible(true);
private JTabbedPane createTabbedPane(int deep) {
deep++;
JTabbedPane tabs = new JTabbedPane();
for (int i = 0; i < 4; i++) {
if (deep < 4) {
tabs.add(i + ":" + deep + " - Focus", createTabbedPane(deep));
} else {
tabs.add(i + ":" + deep + " - Focus", new JTextField());
return tabs;
public static void main(String[] args) {
new TabPaneTest();
}When there are tiered JTabbedPanes and focus in one of the children and the tabbed is switched focus will go to the first component in the frame.
Is there a work around to keep the focus at least on the jtabbedpane?
Is this a know bug? anyone heard of this before?
Googling: JTabbedPane focus didn't bring up anything helpful... is there something else I should be searching under?
Here is an example:
import javax.swing.*;
import java.awt.*;
import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
public class TabPaneTest extends JFrame {
public TabPaneTest() {
JButton focusStealer = new JButton("Look at me!");
focusStealer.addFocusListener(new FocusListener() {
public void focusGained(FocusEvent e) {
System.out.println("I TOOK FOCUS! W00t!");
public void focusLost(FocusEvent e) {
//To change body of implemented methods use File | Settings | File Templates.
JTabbedPane tabbedPane = createTabbedPane(0);
getContentPane().add(focusStealer, BorderLayout.NORTH);
getContentPane().add(tabbedPane, BorderLayout.CENTER);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
setSize(300, 200);
setLocation(400, 200);
setVisible(true);
private JTabbedPane createTabbedPane(int deep) {
deep++;
JTabbedPane tabs = new JTabbedPane();
for (int i = 0; i < 4; i++) {
if (deep < 4) {
tabs.add(i + ":" + deep + " - Focus", createTabbedPane(deep));
} else {
tabs.add(i + ":" + deep + " - Focus", new JTextField());
return tabs;
public static void main(String[] args) {
new TabPaneTest();
} -
Hello.
I need set the focus on first object in a JInternalFrame.
The form JInternalFrame contain a JTabbedPanel and this include object jFormatedTextFields.
I need when the init form set the focus over first object in the first tab of JTabbedPanel. How I do?.
Than Youworks OK in this
(tabbed panes seem to be working OK for focus now, don't know what's changed)
import javax.swing.*;
import java.awt.*;
import javax.swing.text.*;
class Testing extends JFrame
MaskFormatter mf;
JFormattedTextField ftf;
public Testing()
setLocation(300,200);
setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
try{mf = new MaskFormatter("###.###.##.##");}
catch(Exception e){e.printStackTrace();}
ftf = new JFormattedTextField(mf);
JTabbedPane tp = new JTabbedPane();
tp.addTab("A",ftf);
JDesktopPane dp = new JDesktopPane();
JInternalFrame if1 = new JInternalFrame( "I-F1", true, true, true, true );
if1.setLocation(50,50);
if1.getContentPane().add(tp);
if1.pack();
if1.setVisible(true);
dp.add(if1);
getContentPane().add(dp);
setSize(400,300);
setVisible(true);
ftf.requestFocusInWindow();
public static void main(String[] args){new Testing();}
}
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