Preventing focus from jumping in wrong field on hitting "tab"
Hello! In my app, i got several jtextfields and a jtable.
the jtable is positioned beside a row of textfields.
now when i hit the tab key, the focus jumps not from textfield to textfield, but from the textfield near the jtable to the jtable.
how can i prevend the focus to go to the table?
image: http://copy-left.de/pub/images/Bildschirmphoto2.png
thank you!
"Customizing Focus Traversal"
http://java.sun.com/docs/books/tutorial/uiswing/misc/focus.html#customFocusTraversal
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Hi experts
I am trying to prevent users from changing 'Ship to' field of Purchase Order without authorisation. OPOR.Address2
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END
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Try this:
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BEGIN
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END
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'''Test 1; '''
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Without entering anything in any field.
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Hi,
I noticed a strange focus traversal behavior of JTabbedPane.
During tab traversal (when the user's intention is just to switch between tabs), the focus is transferred to a component outside of the tabs (if there is a component after/below the JTabbedPane component), if using Java 6. For example, if using the SSCCE below...
import java.awt.BorderLayout;
import java.awt.event.FocusAdapter;
import java.awt.event.FocusEvent;
import java.awt.event.KeyEvent;
import javax.swing.Box;
import javax.swing.BoxLayout;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTabbedPane;
import javax.swing.JTextField;
import javax.swing.SwingUtilities;
public class TabbedPaneTest extends JPanel {
public TabbedPaneTest() {
super(new BorderLayout());
JTabbedPane tabbedPane = new JTabbedPane();
tabbedPane.addTab("Tab 1", buildPanelWithChildComponents());
tabbedPane.setMnemonicAt(0, KeyEvent.VK_1);
tabbedPane.addTab("Tab 2", buildPanelWithChildComponents());
tabbedPane.setMnemonicAt(1, KeyEvent.VK_2);
tabbedPane.addTab("Tab 3", buildPanelWithChildComponents());
tabbedPane.setMnemonicAt(2, KeyEvent.VK_3);
tabbedPane.addTab("Tab 4", buildPanelWithChildComponents());
tabbedPane.setMnemonicAt(3, KeyEvent.VK_4);
JPanel panel = new JPanel(new BorderLayout());
panel.add(tabbedPane);
JButton button = new JButton("Dummy component that gains focus when switching tabs");
panel.add(button, BorderLayout.SOUTH);
* To replicate the focus traversal issue, please follow these steps -
* 1) Run this program in Java 6; and then
* 2) Click on a child component inside any tab; and then
* 3) Click on any other tab (or use the mnemonic keys ALT + 1 to ALT 4).
button.addFocusListener(new FocusAdapter() {
@Override
public void focusGained(FocusEvent e) {
System.err.println("Gained focus (not supposed to when just switching tabs).");
add(new JScrollPane(panel));
private JPanel buildPanelWithChildComponents() {
JPanel panel = new JPanel();
BoxLayout boxlayout = new BoxLayout(panel, BoxLayout.PAGE_AXIS);
panel.setLayout(boxlayout);
panel.add(Box.createVerticalStrut(3));
for (int i = 0; i < 4; i++) {
panel.add(new JTextField(10));
panel.add(Box.createVerticalStrut(3));
return panel;
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
JFrame frame = new JFrame("Test for Java 6");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TabbedPaneTest());
frame.pack();
frame.setVisible(true);
... Then we can replicate this behavior by following these steps:
1) Run the program in Java 6; and then
2) Click on a child component in any of the tabs; and then
3) Click on any other tab (or use the mnemonic keys 'ALT + 1' to 'ALT + 4').
At step 3 (upon selecting any other tab), the focus would go to the component below the JTabbedPane first (hence the printed message in the console), before actually going to the selected tab.
This does not occur in Java 7, so I'm assuming it is a bug that is fixed. And I know that Oracle suggests that we should use Java 7 nowadays.
The problem is: We need to stick to Java 6 for a certain application. So I'm looking for a way to fix this issue for all our JTabbedPane components while using Java 6.
So, is there a way to prevent JTabbedPanes from passing the focus to components outside of the tabs during tab traversal (e.g. when users are just switching between tabs), in Java 6?
Note: I've read the release notes between Java 6u45 to Java 7u15, but I was unable to find any changes related to the JTabbedPane component. So any pointers on this would be deeply appreciated.
Regards,
JamesHi Kleopatra,
Thanks for the reply.
Please allow me to clarify first: Actually the problem is not that the child components (inside tabs) get focused before the selected tab. The problem is: the component outside of the tabs gets focused before the selected tab. For example, the JButton in the SSCCE posted above gets focused when users switch between tabs, despite the fact that the JButton is not a child component of the JTabbedPane.
It is important for me to prevent this behavior because it causes a usability issue for forms with 'auto-scrolling' features.
What I mean by 'auto-scrolling' here is: a feature where the form automatically scrolls down to show the current focused component (if the component is not already visible). This is a usability improvement for long forms with scroll bars (which saves the users' effort of manually scrolling down just to see the focused component).
To see this feature in action, please run the SSCCE below, and keep pressing the 'Tab' key (the scroll pane will follow the focused component automatically):
import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.event.FocusAdapter;
import java.awt.event.FocusEvent;
import java.awt.event.KeyEvent;
import javax.swing.JButton;
import javax.swing.JComponent;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTabbedPane;
import javax.swing.JTextField;
import javax.swing.JViewport;
import javax.swing.SwingUtilities;
public class TabbedPaneAutoScrollTest extends JPanel {
private AutoScrollFocusHandler autoScrollFocusHandler;
public TabbedPaneAutoScrollTest() {
super(new BorderLayout());
autoScrollFocusHandler = new AutoScrollFocusHandler();
JTabbedPane tabbedPane = new JTabbedPane();
tabbedPane.addTab("Tab 1", buildPanelWithChildComponents(20));
tabbedPane.setMnemonicAt(0, KeyEvent.VK_1);
tabbedPane.addTab("Tab 2", buildPanelWithChildComponents(20));
tabbedPane.setMnemonicAt(1, KeyEvent.VK_2);
tabbedPane.addTab("Tab 3", buildPanelWithChildComponents(20));
tabbedPane.setMnemonicAt(2, KeyEvent.VK_3);
tabbedPane.addTab("Tab 4", buildPanelWithChildComponents(20));
tabbedPane.setMnemonicAt(3, KeyEvent.VK_4);
JPanel panel = new JPanel(new BorderLayout());
panel.add(tabbedPane);
JButton button = new JButton("Dummy component that gains focus when switching tabs");
panel.add(button, BorderLayout.SOUTH);
* To replicate the focus traversal issue, please follow these steps -
* 1) Run this program in Java 6; and then
* 2) Click on a child component inside any tab; and then
* 3) Click on any other tab (or use the mnemonic keys ALT + 1 to ALT 4).
button.addFocusListener(new FocusAdapter() {
@Override
public void focusGained(FocusEvent e) {
System.err.println("Gained focus (not supposed to when just switching tabs).");
button.addFocusListener(autoScrollFocusHandler);
JScrollPane scrollPane = new JScrollPane(panel);
add(scrollPane);
autoScrollFocusHandler.setScrollPane(scrollPane);
private JPanel buildPanelWithChildComponents(int numberOfChildComponents) {
final JPanel panel = new JPanel(new GridBagLayout());
final String labelPrefix = "Dummy Field ";
final Insets labelInsets = new Insets(5, 5, 5, 5);
final Insets textFieldInsets = new Insets(5, 0, 5, 0);
final GridBagConstraints gridBagConstraints = new GridBagConstraints();
JTextField textField;
for (int i = 0; i < numberOfChildComponents; i++) {
gridBagConstraints.insets = labelInsets;
gridBagConstraints.gridx = 1;
gridBagConstraints.gridy = i;
panel.add(new JLabel(labelPrefix + (i + 1)), gridBagConstraints);
gridBagConstraints.insets = textFieldInsets;
gridBagConstraints.gridx = 2;
textField = new JTextField(22);
panel.add(textField, gridBagConstraints);
textField.addFocusListener(autoScrollFocusHandler);
return panel;
public static void main(String[] args) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
JFrame frame = new JFrame("Test for Java 6 with auto-scrolling");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.add(new TabbedPaneAutoScrollTest());
frame.setSize(400, 300);
frame.setVisible(true);
* Crude but simple example for auto-scrolling to focused components.
* Note: We don't actually use FocusListeners for this feature,
* but this is short enough to demonstrate how it behaves.
class AutoScrollFocusHandler extends FocusAdapter {
private JViewport viewport;
private JComponent view;
public void setScrollPane(JScrollPane scrollPane) {
viewport = scrollPane.getViewport();
view = (JComponent) viewport.getView();
@Override
public void focusGained(FocusEvent event) {
Component component = (Component) event.getSource();
view.scrollRectToVisible(SwingUtilities.convertRectangle(component.getParent(),
component.getBounds(), view));
Now, while the focus is still within the tab contents, try to switch to any other tab (e.g. by clicking on the tab headers, or by using the mnemonic keys 'ALT + 1' to 'ALT + 4')...
... then you'll notice the following usability issue:
1) JRE 1.6 causes the focus to transfer to the JButton (which is outside of the tabs entirely) first; then
2) In response to the JButton gaining focus, the 'auto-scrolling' feature scrolls down to the bottom of the form, to show the JButton. At this point, the tab headers are hidden from view since there are many child components; then
3) JRE 1.6 transfers the focus to the tab contents; then
4) The 'auto-scrolling' feature scrolls up to the selected tab's contents, but the tab header itself is still hidden from view (as a side effect of the behavior above); then
5) Users are forced to manually scroll up to see the tab headers whenever they are just switching between tabs.
In short, the tab headers will be hidden when users switch tabs, due to the Java 6 behavior posted above.
That is why it is important for me to prevent the behavior in my first post above (so that it won't cause usability issues when we apply the 'auto-scrolling' feature to our forms).
Best Regards,
James -
Text Area steals Focus from Text Field when selected with mouse
I have created a very simple form with 4 spry validation elements here :: http://octopusdesign.net/contactus.html
When I attempt to select the 'Your Email' text field using the mouse, focus is grabbed by the text area above it.
It is only possible to get focus on the 'Your Email' text field by using tab.
My best guess is that this is a bug in the framework.
In addition to updating my spry libraries to 1.6 from 1.4 I've tried the following things::
Reordering the elements in the form.
Creating the elements in a different order.
Replacing the validation elements with ordinary elements.
None of these fixed the problem.
Strangely, if I remove the validation text area there is no problem.
If anyone can shed some light on this I would really appreciate it.
Wisdom gratefully received.
ChrisFurthermore ::
I've tried to reconstruct the form from scratch and discovered that if you have a validation text field and a validation text area in any order on the form, selecting the 2nd element with the mouse always results in the first element stealing the focus. -
After deleting an email address from Contacts is there any way of preventing it from popping up in the To: field of Mail when one starts to type in a contact name?
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Flash doesn't always prevent HTML from getting input events even if it has focus
Hi,
There's been two such problems for some time now.
- Take any HTML page with enough content to be able to scroll down. Add an SWF in there, for example that page could be a Flash tutorial and the SWF illustrates one of its steps.
If that SWF makes use of the mouse wheel, for instance to zoom in or whatever, it does receive the event provided it has focus but the HTML page ALSO does. So the page scrolls down and the SWF vanishes from view (while it zooms in its own content ).
- There is a similar (worse) issue with Firefox "Search as you type" feature (Firefox > Options > Advanced > General > Search as you type checkbox). Sometimes, mostly with the letter A it seems, when you try to for instance move a character in Flash with WASD, Firefox will also trigger the Search as you type box, which steals focus from Flash. Pretty bad when you're gaming.
Are you aware of these bugs ? Didn't find mention of them. Can they be fixed pretty please ?
Thanks.Ok
It's great that you guys are in close contact. Mozilla has been working a LOT on JS speed these past few years. In early days I think they took hints from you, but now the reverse could apply, you could maybe use Mozilla's work on JS to fasten AS3 ?
Anyway! So I will show only the find as you type issue to Mozilla then, although they will have to wait a week because I can't spend more time dealing with Bugzilla right now, I made the case reproducible and that will be enough till next week
So here is how you might be able to reproduce it:
- Enable Firefox find as you type (FayT)
- Open the HTML page in this zip and give focus to the game
- Play around a few seconds (WASD, left click to shoot, right click to change weapon, target enemies with cursor position relative to character)
- "Accidentally" click outside of the game area (which means inside the HTML page) while you're walking with WASD
- FayT is triggered as expected. (Even though this can be an issue if the page is scrollable and FayT scrolls the game away from view)
- Click inside the game ONCE
- Either wait or play around some more, but do not click again
- Once the search bar disappears, you lose focus. Pressing keys either has no effect or triggers FayT again.
Expected: The game keeps focus when search bar disappears.
Notes:
- There are other, likely similar methods to reproduce this
- Clicking a second time within the SWF prevents the focus issue to happen (I think. Maybe not with all methods ?)
- It works with other HTML pages and other SWFs. You should be able to trigger the bug even with a barebones SWF that only registers key strokes, I think.
- I didn't give you the step by step way to have focus locked in the SWF instead of away from it, but it should be similar. 2 clicks outside might fix it. Plus, I can't see a situation where this "reverse bug" would be annoying for the user. -
How to prevent apps from stealing focus?
Often when I am running an application in the background, it will steal focus from my active window with a modal dialog box that will pop up in the foreground. Invariably, since I can be a fast typer sometimes, I won't be able to stop myself in time and will often cause the modal dialog box to take some unwanted action. This can have a HIGHLY unpleasant effect! Especially if I've just found myself aborting unintentionally a long job because of the focus stealing!
I'd like to prevent any application from stealing focus from the active window. Is there any way to set OS X or the finder to prevent this? If not, are there any haxies that I can install that will have this effect?
(For reference, Microsoft Vista Aero doesn't allow an application to open a window or dialogue above the active window, unless it's a UAC confirmation dialog, which still only opens on a different display layer.)YES AAAAAAAAAH THIS IS A REAL AGRESSION TO THE NERVES ! ! !
I need to meet the dude who decided "hey wouldn't it be a great idea if we had the applications bothering you all the time as soon as they need your attention, instead of just letting you get to them whenever you feel like it ? now where's my promotion ? ^^"
WHERE IS THIS MORON AAAAAAAAAHHHHHHHHHHHHHHHH
does anyone know of a 3rd party software that would keep each app where it is whatever happens to it ?
dammit
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