Develop Reference

Java's JOptionsPane dialog window too small?

I created a Panel to allow some user input. This panel needs to come over the application's main window which is usually marked as 'alwaysOnTop'. So the input panel is shown using JOptionPane like this:
ConfigurationPanel cp = new ConfigurationPanel();
cp.setDuration(total);
JWindow window = (JWindow) SwingUtilities.getWindowAncestor(TimerPanel.this);
window.setAlwaysOnTop(false);
if (JOptionPane.showConfirmDialog(TimerPanel.this, cp, "Settings", JOptionPane.OK_CANCEL_OPTION) == JOptionPane.OK_OPTION) {
// if successfull, take data
try {
total = cp.getDuration();
savePreferences();
reset();
} catch (DateTimeParseException dtpe) {
// do nothing
}
}
window.setAlwaysOnTop(true);
The ConfigurationPanel has been created with the NetBeans GUI builder which has not failed me in 20 years, so I never actually checked. But since it was mentioned I checked and the cnnstructor calls initComponents(), which in turn contains these lines:
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(this);
this.setLayout(layout);
This is what the panel itself shall look like (screenshot from Netbeans IDE):
And this is what the combination looks like at runtime:
Why are the main buttons Ok and Cancel not properly visible? This has worked in the past, and it seems the problem comes from outside my code...
This seems to happen both on Windows 10 based Oracle Java 13.0.1+9 and 15.0.1+9-18 and OpenJDK 16.0.1+9-24.

Switching from GroupLayout (Netbeans' default layout) to GridBagLayout resolved the issue.

How to disable PDF print options using JWebBrowser

I'm using The DJ Project to open PDF files into JFrame.
Using the next code:
JPanel panel = new JPanel();
setContentPane(panel);
JWebBrowser browser = new JWebBrowser();
browser.setBarsVisible(false);
browser.setStatusBarVisible(false);
browser.print(false);
browser.setPreferredSize(new Dimension(800,600));
panel.add(browser);
browser.navigate("C:\\Users\\MyUser\\Desktop\\acta.pdf");
pack();
setVisible(true);
setPreferredSize(new Dimension(800,600));
And is loading the PDF file, but I want to disable the next options:
The print and Save option. I know that is rendering over a Web Browser.
Is posible remove those options using java ?

The only way that I already found, is disabling all the components and interactions, with:
browser.getNativeComponent().setEnabled(false)
Or disabled all the right clicks, for example:
webBrowser.executeJavascript("document.oncontextmenu = function functionName(){ return false; }");

Adding Webcam panel to existing jPanel

I'm using NetBeans and I made basic layout with jPanel in the middle of it. Now I would like to add Webcam panel in this jPanel.
Here's example how to get frames from webcam and display it in new window. It's working fine.
Webcam webcam = Webcam.getDefault();
webcam.setViewSize(WebcamResolution.VGA.getSize());
WebcamPanel panel = new WebcamPanel(webcam);
panel.setFPSDisplayed(true);
panel.setDisplayDebugInfo(true);
panel.setImageSizeDisplayed(true);
panel.setMirrored(true);
JFrame window = new JFrame("Test webcam panel");
window.add(panel);
window.setResizable(true);
window.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
window.pack();
window.setVisible(true);
But when I tried to display it in my existing jPanel it's not working. Webcam screen is not visible. Here's my code:
Webcam webcam = Webcam.getDefault();
webcam.setViewSize(WebcamResolution.VGA.getSize());
WebcamPanel panel = new WebcamPanel(webcam);
panel.setFPSDisplayed(true);
panel.setDisplayDebugInfo(true);
panel.setImageSizeDisplayed(true);
panel.setMirrored(true);
jPanel5.add(panel);
jPanel5.setVisible(true);
I call all of this in my main class constructor. Just after other netbeans componenst are loaded. When I add example it's working good but then my main layout is loaded and webcam screen in another window. I would like to get it in the same window.
I have seen other topics about adding image to jPanel but it's not working with capturing movie from webcam.
Thanks for help.

But when I tried to display it in my existing jPanel it's not working.
When you add components to a visible GUI the basic code is:
panel.add(...);
panel.revalidate(); // invoke the layout manager
panel.repaint(); // paint components
All component have a default size of (0, 0) when created so there is nothing to paint. You need to invoke the layout manager so the component is given a size/location.

I changed a little my application and now in the middle of main windows is JTabbedPane and I found a solution to my problem. Instead of making Tabs using NetBeans window designer I made it with code.
I made empty JTabbedPane in Netbeans and then add this to code:
final JPanel jPanelCamera = new JPanel();
jTabbedPane1.addTab("Camera", jPanelCamera);
Webcam webcam = Webcam.getDefault();
webcam.setViewSize(WebcamResolution.VGA.getSize());
WebcamPanel webcamPanel = new WebcamPanel(webcam);
webcamPanel.setFPSDisplayed(true);
webcamPanel.setDisplayDebugInfo(true);
webcamPanel.setImageSizeDisplayed(true);
webcamPanel.setMirrored(true);
jPanelCamera.add(webcamPanel);
jPanelCamera.getParent().revalidate();
System.out.println("Camera OK");
I have no idea why earlier when I made component using NetBeans designer it was't working but now it's working good. I think if someone would add this not to JTabbedPane, but to JPanel should also make this panel with code. Not with Netbeans designer and then it should work.

Focus issues with java7 modal dialogs on mac osx

I've been validating a swing application that runs on an applet for mac osx.
During this validation I found the following issues with the modal dialogs:
When a dialog is open and is setModal(true) it blocks the content of the root window, but if you click somewhere on the root window, the dialog goes under it, but it should remain on the top of the root window.
If the dialog has a JTextInputField it does not receive focus even when you click on it.
So I created a small program to show the problem. Can you please help me to understand what is wrong here?
package com.macosx.tests;
import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import javax.swing.*;
public class DialogExample extends JApplet{
private static final long serialVersionUID = 1L;
private JPanel panel;
private JButton openDialogBtn;
private void doStart() {
panel = new JPanel();
panel.setPreferredSize(new Dimension(500,500));
openDialogBtn = new JButton("open dialog");
openDialogBtn.addActionListener(new ActionListener(){
#Override
public void actionPerformed(ActionEvent arg0) {
ModalDialog dialog = new ModalDialog(panel, true);
dialog.setVisible(true);
}
});
panel.add(openDialogBtn);
setContentPane(panel);
}
class ModalDialog extends JDialog {
private static final long serialVersionUID = 1L;
public ModalDialog(Component parent, boolean modal) {
Dimension dimensionParentFrame = parent.getSize();
setSize(new Dimension((parent == null) ? 300 : dimensionParentFrame.width / 2, 75));
setModal(modal);
setModalityType(ModalityType.APPLICATION_MODAL);
JTextField txtField = new JTextField();
add(txtField, BorderLayout.CENTER);
}
}
#Override
public void start() {
try {
SwingUtilities.invokeAndWait(new Runnable() {
public void run() {
doStart();
}
});
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}
Use the above to create a .jar file (test.jar). Once that is done, create a html file with the following content:
<html>
<head>
<title>Dialog test Applet</title>
</head>
<body>
<applet id="DialogTestApplet" height="800" width="600"
code="com.macosx.tests.DialogExample"
archive="test.jar">
</applet>
</div>
</body>
</html>
When this is done, run the html file. You'll see an applet with a gray background and with a button. Then try to:
click on the button to open the dialog. After that, click somewhere on the gray area: the dialog goes under the browser window but it should remain on the top, right?
click on the button to open the dialog. After that click on the textfield of the dialog and try to write something: the textdialog does not receive focus.
So, what am I doing wrong here? Can someone with a mac computer test this please?
Thanks
Specs:
java.vendor Oracle Corporation
java.version 1.7.0_07
os.name Mac OS X
os.version 10.7.4
browser firefox 15
NOTE: please note that this is only happening when the applet runs on the browser and only on mac osx.

I found another workaround. When the window is opened, show an optionpane for a few milliseconds and close it. It give the focus to the optionpane and then back to the dialog, allowing to ignore the bug.
Add this snipet of code to your dialog constructor and it should work:
addWindowListener(new WindowAdapter(){
public void windowOpened(WindowEvent e){
JOptionPane pane = new JOptionPane();
final JDialog dialog = pane.createDialog("Please Wait");
Timer timer = new Timer(50, new ActionListener() {
public void actionPerformed(ActionEvent e) {
dialog.dispose();
}
});
timer.setRepeats(false);
timer.start();
dialog.setVisible(true);
}

You should put an "owner" window on your ModalDialog. To do that, you must call super(owner) in your ModalDialog constructor and you can retrieve the parent window of your component parent with SwingUtilities.getWindowAncestor(parent).

not Mac/OSX user but this is common issue about Focus and JDialog,
there are another issues in the case that JDialog is created on Runtime,
Focus is asynchronous based on properties came from Native OS
create this JDialog only once time and re_use this container for another action
JDialog#setVisible should be wrapped into invokeLater() too
is possible to force the Focus by JTextField#setText(JTextField#getText()) wrapped into invokeLater()
there is Dialog Focus, one of great workaround by #camickr

I confirm, I have the same bug with an old applet running in JDK7 on OS X. As the poster mentioned, the bug is seen only with the applet running in the browser (ff) and not with the appletviewer.

I can verify that this is a problem for Java 1.7 Update 7+ on the Safari 6 and Firefox running on Mountain Lion. Curiously it is not a problem on earlier versions of Safari that run on Lion but it is a problem in Firefox on the older OS. I am pretty desperate to find a fix for this as a number of my applet users are on Macs. One workaround that I have found (that is not sufficient by any means) is to minify the window and then reopen it. The textfields/textareas then become editable. Hopefully, we can find a better solution that gets around this annoying requirement.

I experienced the same problem on Mac with Java 7 update 9 with Safari and Firefox. When I opened a JDialog which contained a JTextField the JTextField was inaccessible.
I did find a solution. I inserted a delay from when the user pressed the “show dialog button” to executing the code that shows the button.
For example:
ActionListener al = new ActionListener(){
public void actionPerformed(ActionEvent ae){
TitleDialog dialog = new TitleDialog(main.findParentFrame()); // My JDialog which contains a JTextField.
dialog.setVisible(true);
}
};
javax.swing.Timer timer = new javax.swing.Timer(1000, al);
timer.setRepeats(false);
timer.start();
I experienced that if the delay was to short the solution would not work.
If one uses SwingUtilities.invokeLater instead of javax.swing.Timer it will not work. Maybe the delay of SwingUtilities.invokeLater is too short.

I found one more workaround. When JDialog is invoked from JavaScript it has a focus.
Create an applet's method which will show a dialog
Call this method from JavaScript.
Hope, it helps. By the way, web start samples from Java tutorial have the same issue http://docs.oracle.com/javase/tutorial/uiswing/components/textfield.html

I want to use the workaround above (to open dialog from the dialog), but without showing any dialog.
Here is a code for not visible dialog.
final JDialog dialog = new JDialog();
dialog.setUndecorated(true);
dialog.setSize(0, 0);
dialog.setModal(true);
dialog.pack();

I have found a solution.
GetDirectory varGetDirectory = new GetDirectory(new JFrame(),true);
varGetDirectory.setVisible(true);
GetDirectory is JDialog containing a JFileChooser.
The weird thing is that all JDialog object should be called using new JFrame() as parent, otherwise clicking from one parent window, will bring the top modal JDialog backwards in the zOrder and somehow it cannot be set on top anymore.
My problem was the same as above. When I have created the JDialog from another JDialog, the new dialog appeared behind the other.
To bring it to top I have set the parent of all JDialogs as described above and it worked according to what expected.

How does NetBeans' Splash Screen feature work?

New to NetBeans and just noticed that in the File >> Project Properties >> Application dialog there is a text field labeled Splash Screen that allows you to specify a path to an image that you would like displayed when your program is launching.
I want to customize the way my splash screen works (adding a progress bar, etc.) and would like to code it from the ground up but don't know where to start. What are the best practices for Java/Swing-based splash screens?
Thanks for any and all input!

The project properties -> Application -> Splash Screen allows you to add an image to an application. This property sets a value in the MANIFEST.MF called SplashScreen-Image: e.g. SplashScreen-Image: META-INF/GlassFish316x159.jpg This property will automatically cause the image to display as a splash screen. It does not work inside NetBeans, and must be run outside the IDE.
There is a tutorial Splash Screen Beginner Tutorial that details how to use it more detail. The tutorial was done for NetBeans 6.8, but will work on 7.2.1 which is the latest at the time of this post.

I'm not sure how NetBeans does it, but Splash Screens are supported by the JRE since version 6. See http://java.sun.com/developer/technicalArticles/J2SE/Desktop/javase6/splashscreen/

Splash screen is just a instance of java.awt.Window or undecorated javax.swing.JFrame.
To create window just say new Window(null), then set size and position (using tookit you can calculate where the screen center is) and then say window.setVisible(true)
Due to this is your own window you can do what you want: set layout, image, add process bar to the SOUTH etc.
You can also use JFrame: new JFrame().setUndecorated(true)`

There are a couple of ways to do this.
To do a simple splash screen (an image) you can specify this in the command line of you java application.
Here is a simple example
java -splash:<file name> <class name>
However, if you want a progress bar, you are going to have to do something a little more complicated, and write some code yourself. This is done in the following way.
Create a JWindow (or Window or undecorated JFrame) component with your splash screen elements
Set it to visible
Do the rest of your Swing GUI startup code
Set your JFrame to visible, then immediately follow with setting the JWindow to visible(false)
This should show the splash almost immediately, and then hide once the your application is fully loaded.
To see some splash screen code, take a look here. The implementation in the link only shows how to achieve what you can with the -splash command, but it will give you a good start to also include the progress bar that you requested.

I hope this helps you, it is a small example of how to create yourself a simple splash screen using a dummy Progress Bar:
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
class SplashScreen extends JWindow
{
private static JProgressBar progressBar = new JProgressBar();
private static SplashScreen execute;
private static int count;
private static Timer timer1;
public SplashScreen()
{
Container container = getContentPane();
container.setLayout(null);
JPanel panel = new JPanel();
panel.setBorder(new javax.swing.border.EtchedBorder());
panel.setBackground(new Color(255,255,255));
panel.setBounds(10,10,348,150);
panel.setLayout(null);
container.add(panel);
JLabel label = new JLabel("Hello World!");
label.setFont(new Font("Verdana",Font.BOLD,14));
label.setBounds(85,25,280,30);
panel.add(label);
progressBar.setMaximum(50);
progressBar.setBounds(55, 180, 250, 15);
container.add(progressBar);
loadProgressBar();
setSize(370,215);
setLocationRelativeTo(null);
setVisible(true);
}
public void loadProgressBar()
{
ActionListener al = new ActionListener()
{
public void actionPerformed(java.awt.event.ActionEvent evt)
{
count++;
progressBar.setValue(count);
if (count == 50){
timer1.stop();
execute.setVisible(false);
//load the rest of your application
}
}};
timer1 = new Timer(50, al);
timer1.start();
}
public static void main (String args[]){
execute = new SplashScreen();
}
}
Cheers!

Also consider to build your application on top of the NetBeans Platform (a Swing-based RCP). One of the many benefits: it comes with a customizable splash screen with progress bar.
Sample progress bar:
http://platform.netbeans.org/tutorials/nbm-paintapp.html#wrappingUp
Port a Swing application to the NetBeans Platform:
http://platform.netbeans.org/tutorials/60/nbm-porting-basic.html
Further links:
http://netbeans.org/features/platform/index.html
http://netbeans.org/features/platform/all-docs.html

If your application is build using NetBeans Platform, then here's a tutorial about splash screen customisation: http://wiki.netbeans.org/Splash_Screen_Beginner_Tutorial

There is a sample Javafx equivalent of Splash screen. However this splash screen is basically a java swing applet that is called from javafx to be displayed to the user and simulates more or less eclipse and netbeans splash screen using progress bar and titles for the loaded contents. This is the link.
You must be able to get the code and separate out the splash screen code written in java swings and use it for yourself.
This is a custom java swings splash screen. and hence to center the splash screen it uses the traditional
Dimension screenSize = Toolkit.getDefaultToolkit().getScreenSize();
Dimension labelSize = l.getPreferredSize();
setLocation(screenSize.width / 2 - (labelSize.width / 2),
screenSize.height / 2 - (labelSize.height / 2));