CODEWITHSUNDEEP
javaswtjface
forumfresser
forumfresser

Reputation: 471

Java SWT - Creating a new window from other class

Today I wanted to create a simple Java SWT GUI Application using Eclipse, but for better clarity I wanted to have every sub-window in a different class. Since I am very new to Java Programming, is there a way to make a different class do its thing just by calling a method? I looked everywhere on the internet, but couldn't find what I was looking for...

Here's what I have so far

Button foo = new Button(shell, SWT.PUSH);
foo.setText("Edit");
foo.addListener(SWT.Selection, new Listener() {
    public void handleEvent(Event e) {
        switch (e.type) {
            case SWT.Selection:
                // Call the other Class file here
                break;
        }
    }
});

Upvotes: 1

Views: 9545

Answers (1)

Georgian
Georgian

Reputation: 8960

Yes. It is possible. I wouldn't call it "calling a class" though, rather "opening another window" in SWT terms.

You simply wrap a Shell in your other class, then call the open() API from "outside".

If you want to edit something, you could even create wizards.

There are many ways to do what you want to do, I simply chose one of the simple versions. But this is not the only way to do it. Wait for Baz to answer, he'll come along with another cool example. ;)

I would recommend you read the Shell's javadoc, too.

Example:

ShellTest.class (run this as Java Application)

/**
 * 
 * @author ggrec
 *
 */
public class ShellTest
{

    // ==================== 2. Instance Fields ============================

    private AnotherShell anotherShell;


    // ==================== 3. Static Methods =============================

    public static void main(final String[] args)
    {
        new ShellTest();
    }


    // ==================== 4. Constructors ===============================

    private ShellTest()
    {
        final Display display = new Display();
        final Shell shell = new Shell(display);
        shell.setLayout(new GridLayout(1, false));

        anotherShell = new AnotherShell();

        createContents(shell);

        shell.pack();
        shell.open();
        while (!shell.isDisposed())
        {
            if ( !display.readAndDispatch() )
                display.sleep();
        }
        display.dispose();
    }


    // ==================== 5. Creators ===================================

    private void createContents(final Composite parent)
    {
        final Button buttonOpen = new Button(parent, SWT.PUSH);
        buttonOpen.setText("Open");

        buttonOpen.addSelectionListener(new SelectionAdapter()
        {
            @Override public void widgetSelected(final SelectionEvent e)
            {
                anotherShell.open();
            }
        });

        final Button buttonClose = new Button(parent, SWT.PUSH);
        buttonClose.setText("Close");

        buttonClose.addSelectionListener(new SelectionAdapter()
        {
            @Override public void widgetSelected(final SelectionEvent e)
            {
                anotherShell.close();
            }
        });
    }
}

AnotherShell.class (this would be your "other class")

/**
 * 
 * @author ggrec
 *
 */
public class AnotherShell
{

    // ==================== 2. Instance Fields ============================

    private Shell shell;


    // ==================== 4. Constructors ===============================

    public AnotherShell()
    {
        shell = new Shell(Display.getCurrent());
    }


    // ==================== 6. Action Methods =============================

    public void open()
    {
        shell.open();
    }

    public void close()
    {
               // Don't call shell.close(), because then
               // you'll have to re-create it
        shell.setVisible(false);
    }
}

Upvotes: 8

Related Questions