Eclipse RCP get part instance

Question

I am trying to get reference to part which is connected to Java class. I can use

`@PostConstruct
public void createComposite(Composite parent) {

}`

and then "parent" variable is what I need. But I want to have another method. I am trying to add static variable to save it like that:

public class BibliotekaZmianyPart {
private static Label label;
private static Button button;
private static Composite part;

@PostConstruct
public void createComposite(Composite parent) {
    part = parent;
}

public static void editBook() {
    GridLayout layout = new GridLayout(2, false);
    part.setLayout(layout);
    label = new Label(part, SWT.NONE);
    label.setText("A label");
    button = new Button(part, SWT.PUSH);
    button.setText("Press Me");
}}

and then "part" should be variable which I need - but it doesn't work.

Answer 1

You can't have a static method like that referencing instance variables.

If you want to reference an existing part from another part you use the EPartService to find the part:

@Inject
EPartService partService;


MPart mpart = partService.findPart("part id");

BibliotekaZmianyPart part = (BibliotekaZmianyPart)mpart.getObject();

part.editBook();   // Using non-static 'editBook'

If the part is not already open you use the part service showPart method:

MPart mpart = partService.showPart("part id", PartState.ACTIVATE);

BibliotekaZmianyPart part = (BibliotekaZmianyPart)mpart.getObject();

part.editBook();

So your class would be:

public class BibliotekaZmianyPart {
private Label label;
private Button button;
private Composite part;

@PostConstruct
public void createComposite(Composite parent) {
    part = parent;
}

public void editBook() {
    GridLayout layout = new GridLayout(2, false);
    part.setLayout(layout);
    label = new Label(part, SWT.NONE);
    label.setText("A label");
    button = new Button(part, SWT.PUSH);
    button.setText("Press Me");

    // You probably need to call layout on the part
    part.layout();
}}