how to pop up calendar when button is clicked in Java SWT? - swt

Question

I am trying to develop Java SWT application in eclipse.
I need to populate text box using DateTime Calendar in SWT when a button is clicked.
I tried the following code but not able to see the Calendar, though it is created.
Any help would be appreciated.
Thanks
public void createPartControl(final Composite parent) {
Button button;
Label label;
final Display dev = parent.getDisplay();
Image image = new Image(dev,"C:\\Users\\rm186021\\Desktop\\Calendar.gif");
GridLayout gridLayout = new GridLayout();
gridLayout.numColumns = 3;
parent.setLayout(gridLayout);
label = new Label(parent, SWT.NULL);
label.setText("Start date ");
final Text start = new Text(parent, SWT.SINGLE | SWT.BORDER);
Button calButton = new Button(parent, SWT.PUSH);
calButton.setImage(image);
calButton.addSelectionListener(new SelectionAdapter() {
#Override
public void widgetSelected(SelectionEvent e) {
final Display display = new Display();
final Shell shell2 = new Shell(display);
shell2.addListener(SWT.CALENDAR, new Listener() {
public void handleEvent(Event event) {
final DateTime calendar = new DateTime(shell2,SWT.CALENDAR | SWT.POP_UP);
calendar.addSelectionListener (new SelectionAdapter () {
public void widgetSelected (SelectionEvent e) {
start.setData(" " + calendar.getYear() + "-" + (calendar.getMonth() + 1) + "-" + calendar.getDay());
System.out.println(start.getData());
//calendar.dispose();
}
});
}
});
}
});

Answer 1

You're creating a Shell, but never even opening it. Try calling shell2.open().
You're adding an SWT.CALENDAR listener to the Shell. This isn't going to do what you want to do. Or anything, for that matter, since Shell doesn't fire SWT.CALENDAR events. Instead, you simply need to add the DateTime to a container and hook up selection listeners to the Calendar.
SWT.POP_UP is not an appropriate style bit for Calendar.
I would recommend subclassing Dialog (call it CalendarDialog, for example), setting a FillLayout on it, adding a Calendar to it and hooking up listeners that way. Then call CalendarDialog.open().

Answer 2

The DateTime really shouldn't be created with code like that :) Try this instead:
calButton.addSelectionListener(new SelectionAdapter() {
#Override
public void widgetSelected(SelectionEvent e) {
final Shell shell2 = new Shell(dev.getActiveShell());
// new Display() won't work on many platforms if one already exists
final DateTime calendar = new DateTime(shell2, SWT.CALENDAR);
// no need to add a listener to shell2, and POP_UP doesn't work for DateTime
calendar.addSelectionListener(...);
shell2.open();
// Edward Thomson noticed it wasn't called, I missed it
}
};