Develop Reference

Opening a new Window with Java RCP and SWT

I'm currently developing an app, and for this, I'm using Java RCP with SWT.
What I want :
I have a window, and when I click on a Button, i need a whole window to be opened. The window works perfectly and looks like this :
Window1
When I press it, a new window opens. It looks like this :
Window2 (Yup, the middle pic has its importance)
How it's currently done :
The Window 1 is a TrimmedWindow done with the Application.e4xmi, with some Parts in. The button is included in one of these parts. Here's its code :
#PostConstruct
public void postConstruct(Composite parent) {
Button b = new Button(parent, SWT.BORDER);
b.setText("Press me !");
b.addListener(SWT.Selection, new Listener() {
#Override
public void handleEvent(Event event) {
parent.getShell().dispose();
new Game(Display.getCurrent());
}
});
}
The Window 2, as you can see, is a new class called Game. Its constructor is as follows :
public Game(Display display) {
this.display = display;
this.shell = new Shell(this.display);
this.setData();
shell.setText("I don't work properly");
shell.setMinimumSize(800, 600);
this.buildUI();
shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!this.display.readAndDispatch ()) this.display.sleep ();
}
this.display.dispose ();
}
What's the problem ? :
When I launch the project with Eclipse, everything goes WELL. I mean, really. I click, it opens, it loads, yay ! But the idea after this is I export the project as an executable. So I do it. Here's my .exe file. And let's start. And it doesn't work. When I press the button, nothing happens. Not even an error message, nothing.
I've found some solution that says the problem comes from the display, because RCP is single threaded. So I followed the instructions, and here's another version of the Game constructor :
public Game() {
this.display = Display.getDefault();
this.display.asyncExec(new Runnable() {
#Override
public void run() {
shell = new Shell(display);
setData();
shell.setText("I work better but...");
shell.setMinimumSize(800, 600);
buildUI();
shell.pack();
shell.open();
while (!shell.isDisposed()) {
if (!display.readAndDispatch ()) display.sleep ();
}
display.dispose ();
}
});
}
And so here comes the new problem : I can't call an Image after this (hence the pic I showed on Window 2). Because Image (SWT) requires a display to be constructed, and because display doesn't work well without the Runnable instance, I can't use an image after this. And I need my Image here (and also somewhere else after this).
Edit : I have an error message in that case. It says :
org.eclipse.swt.SWTException : Failed to execute runnable
(java.lang.IllegalArgumentException : Argument cannot be null)
Any solutions anyone please ?
Thanks in advance.
Kosnyru.

If you add a Trimmed Window (or just a plain Window) to the 'Windows and Dialogs' section of the Application.e4xmi with 'To Be Rendered' turned off (leave Visible on) you can then show it using:
#Inject
EModelService modelService;
#Inject
MApplication app;
MUIElement window = modelService.find("window id", app);
window.setToBeRendered(true);

JOptionPane look and feel issue

When I run my application in Linux with Metal look and feel, the user can't be identitied whether the button is pressed or not. it look like button is not pressed though the buttton is in press mode. also the right hand side close button icon is not same as windows.
how can i resolve this two issues?
EDIT
I did following way.
try {
m_FrameBackground = new Color(Integer.parseInt((String)
Client.getClient().getProperty("BackgroundColor"),16));
m_TaskBackground = new Color(Integer.parseInt((String)
Client.getClient().getProperty("TaskBackground"),16));
} catch (Exception e) {
m_FrameBackground = new Color(Integer.parseInt("dfd3be",16));
m_TaskBackground = new Color(Integer.parseInt("dfd3be",16));
}
m_FuelTheme.secondary3 = new ColorUIResource(m_FrameBackground);
m_FuelTheme.secondary2 = new ColorUIResource(m_FrameBackground.darker());
m_FuelTheme.secondary1 = new ColorUIResource(m_FrameBackground.darker().darker());
MetalLookAndFeel.setCurrentTheme(m_FuelTheme);
UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel");
JDialog.setDefaultLookAndFeelDecorated(true);

Can't get keyboard focus on JTextField in JDialog

I have a Swing app that has a JDialog pop up and ask for a username and password. I thought it'd be good to have the keyboard focus already in the username field, but everything I've tried so far doesn't work (even though one solution I tried works for a different text field in the program), so....I need some help. Here's my code:
//JTextField usernameField = ...
JDialog dialog = pane.createDialog("Password:");
dialog.setVisible(true);
//Take 1
usernameField.requestFocusInWindow();
//Take 2
dialog.addWindowFocusListener(new WindowAdapter() {
public void windowGainedFocus(WindowEvent e) {
usernameField.requestFocusInWindow();
}
});
//Take 3 - This is what I used elsewhere quite successfully
dialog.addComponentListener(new ComponentAdapter() {
public void componentShown(ComponentEvent e ) {
SwingUtilities.invokeLater(new Runnable() {
public void run() {
usernameField.requestFocusInWindow();
}
});
}
});
For what it's worth, this is with Linux / X11 / Openbox. And when I use GTK, I have to press Tab once to select the appropriate field, but when I use Metal, I have to press it twice.
Thanks in advance.

See Dialog Focus for tips & strategies.

Hows to open an .bmp/.jpeg image using Java

I am working on a JFrame/panel that will contain a button. When the user clicks the button, I want an image (which will be stored in the computer hard disk beforehand) to open on the front screen.
button.addActionListener(new ActionListener(){
public void actionPerformed(ActionEvent e){
//here i want a code that will somehow open the image from a given directory
}});
Any suggestions on how to go about this ? I have to tell where the image is stored and trigger a virtual 'double click' for the image to pop up on the front screen. Is that even possible using java to synchronize such computer functions?

I don't know a very short way, but I would use something like this (as qick hack to get an impression):
try {
// this is a new frame, where the picture should be shown
final JFrame showPictureFrame = new JFrame("Title");
// we will put the picture into this label
JLabel pictureLabel = new JLabel();
/* The following will read the image */
// you should get your picture-path in another way. e.g. with a JFileChooser
String path = "C:\\Users\\Public\\Pictures\\Sample Pictures\\Koala.jpg";
URL url = new File(path).toURI().toURL();
BufferedImage img = ImageIO.read(url);
/* until here */
// add the image as ImageIcon to the label
pictureLabel.setIcon(new ImageIcon(img));
// add the label to the frame
showPictureFrame.add(pictureLabel);
// pack everything (does many stuff. e.g. resizes the frame to fit the image)
showPictureFrame.pack();
//this is how you should open a new Frame or Dialog, but only using showPictureFrame.setVisible(true); would also work.
java.awt.EventQueue.invokeLater(new Runnable() {
public void run() {
showPictureFrame.setVisible(true);
}
});
} catch (IOException ex) {
System.err.println("Some IOException accured (did you set the right path?): ");
System.err.println(ex.getMessage());
}

I think this will work ...
Code:
process = new ProcessBuilder("mspaint","yourFileName.jpeg").start();
This will open your image file with mspaint.....
and also use *Java Advanced Imaging (JAI)*

Try this code
try
{
// the line that reads the image file
BufferedImage image;
// work with the image here ...
image = ImageIO.read(new File("C://Users//Neo//Desktop//arduino.jpg"));
jLabel1.setIcon(new ImageIcon(image));
}
catch (IOException e)
{
// log the exception
// re-throw if desired
}

I'm not sure but try this...
try
{
JLabel picture=new JLabel();
ImageIcon ic=new ImageIcon(Toolkit.getDefaultToolkit().getImage(getClass().getResource("C:\\Users\\Desktop\\xyz.jpg")));
picture.setIcon(ic);
}
catch(Exception)
{
}

How to omit the "Cancel" button in Java ProgressMonitor?

My task is necessary and shouldn't be canceled, how do I ask ProgressMonitor not to display the "Cancel" button, so when it finishes, it will auto close the panel.
Frank

I was thinking maybe I can ask it to
return the components in it and delete
the button
Using the ProgressMonitorDemo from the Swing tutorial (linked to by BalusC) I made the following changes:
public void propertyChange(PropertyChangeEvent evt) {
if ("progress" == evt.getPropertyName() ) {
int progress = (Integer) evt.getNewValue();
progressMonitor.setProgress(progress);
// Added this
AccessibleContext ac = progressMonitor.getAccessibleContext();
JDialog dialog = (JDialog)ac.getAccessibleParent();
java.util.List<JButton> components =
SwingUtils.getDescendantsOfType(JButton.class, dialog, true);
JButton button = components.get(0);
button.setVisible(false);
// end of change
String message =
String.format("Completed %d%%.\n", progress);
progressMonitor.setNote(message);
taskOutput.append(message);
if (progressMonitor.isCanceled() || task.isDone()) {
Toolkit.getDefaultToolkit().beep();
if (progressMonitor.isCanceled()) {
task.cancel(true);
taskOutput.append("Task canceled.\n");
} else {
taskOutput.append("Task completed.\n");
}
startButton.setEnabled(true);
}
}
}
You will need to download the Swing Utils class as well.
The code should only be executed once, otherwise you get a NPE when the dialog closes. I'll let you tidy that up :).

That's not possible. You can however create a custom progress monitor as outlined in this tutorial.