Using wizard and ScrolledForm(jface and forms api)

Question

I'm new to eclipse plugin - SWT development. I'm trying to create wizard page having number of text fields and combo boxes. For better look n feel I'm trying to use FormToolkit for creating components and add them in ScrolledForm. But with this nothing is rendered on wizard page at runtime and there is no error also. Questions:

1. Is it possible to have scrolled container inside wizard page?

2. Can we mix JFace and forms api? (removed unwanted code) Here is wizard page code:

   public class ContactWizardPage extends WizardPage { private static int counter; private Form form;

   public ContactWizardPage() {        
       super("New Contact Wizard" + ++counter, "New Contact Wizard" + counter, null);
       setMessage("Please enter contact info." + counter);
   }
   
   public void createControl(final Composite parent) {
       createControlWithoutToolkit(parent);
       // commenting out toolkit code
   

   // createControlWithToolkit(parent); }

   public void createControlWithoutToolkit(final Composite parent) {
   
       Composite composite = new Composite(parent, SWT.DEFAULT);
       composite.setLayout(new GridLayout(2, true));
   
   
       Label lblFirstName = new Label(composite, SWT.FLAT);
       lblFirstName.setText("First Name");
   
       Label lblLastName = new Label(composite, SWT.FLAT);
       lblLastName.setText("Last Name");
   
       Text txtFirstName = new Text(composite, SWT.FLAT);      
   
       Text txtLastName = new Text(composite, SWT.FLAT);
   
       Label lblEmail = new Label(composite, SWT.FLAT);
       lblEmail.setText("Email");
       GridDataFactory.swtDefaults().span(2, 1).align(
           SWT.FILL, 
           SWT.BEGINNING).applyTo(lblEmail); 
   
       Text txtEmail = new Text(composite, SWT.FLAT);
          GridDataFactory.swtDefaults().span(2, 1).align(
           SWT.FILL, 
           SWT.BEGINNING).applyTo(txtEmail); 
   
       setControl(composite);      
   }   
   
   public void createControlWithToolkit(final Composite parent) {
   
       FormToolkit toolkit = new FormToolkit(Display.getCurrent());
   
       ScrolledForm form = toolkit.createScrolledForm(parent);
   
       Composite composite = form.getBody();
       composite.setLayout(new GridLayout(2, true));
   
       Label lblFirstName = toolkit.createLabel(composite, "First Name");
   
       Label lblLastName = toolkit.createLabel(composite, "Last Name");
   
       Text txtFirstName = toolkit.createText(composite, "");
   
       Text txtLastName = toolkit.createText(composite, "");
   
       Label lblEmail = toolkit.createLabel(composite, "Email");
       GridDataFactory.swtDefaults().span(2, 1).align(
           SWT.FILL, 
           SWT.BEGINNING).applyTo(lblEmail); 
   
       Text txtEmail = toolkit.createText(composite, "");
          GridDataFactory.swtDefaults().span(2, 1).align(
           SWT.FILL, 
           SWT.BEGINNING).applyTo(txtEmail); 
   
       setControl(composite);      
   }
   

   }

Here is Wizard code:

public class SampleNewWizard extends Wizard implements INewWizard {

public SampleNewWizard() {
    super();
    setNeedsProgressMonitor(true);

}

@Override
public IWizardPage getNextPage(IWizardPage page) {
    return super.getNextPage(page); 
}   

public void addPages() {    
    addPage(new ContactWizardPage());
    addPage(new ContactWizardPage());
    addPage(new ContactWizardPage());
    addPage(new ContactWizardPage());               
}

public boolean performFinish() {
    return true;
}


public void init(IWorkbench workbench, IStructuredSelection selection) {

}

}

With this code first page of wizard shows fine but second page is never rendered properly. :( here are screenshots: first page:

second page:

Answer 1

The line

parent.getShell().setSize(240, 320);                    

is upsetting something (and is not something you should do in a wizard page as the Wizard class deals with sizing). Testing here it works fine without it (and I get your problem with it).

Answer 2

Make sure that you do not dispose the FormToolKit as long as the wizard is open. Paint events need the toolkit after createControl() has finished.

My solution is to create and dispose the FormToolKit in the wizard:

@Override
public void createPageControls(Composite pageContainer) {       
    toolkit = new FormToolkit(pageContainer.getDisplay());

    super.createPageControls(pageContainer);
}

@Override
public void dispose() {     
    super.dispose();

    if (toolkit != null) {
        try { toolkit.dispose(); } catch (Exception e) {}
    }
}

public FormToolkit getToolkit() {
    return toolkit;
}

In the wizard pages you can than use ((FormWizard) getWizard).getToolkit() to get a reference to the wizard's form toolkit.

@Override
public void createControl(Composite parent) {

    FormToolkit toolkit = ((FormWizard) getWizard()).getToolkit();

    ...

Hope this helps ...