FocusTraversal.java Source code

Introduction

Here is the source code for FocusTraversal.java

Source

/******************************************************************************
 * Copyright (c) 1998, 2004 Jackwind Li Guojie
 * All right reserved. 
 * 
 * Created on Jan 24, 2004 10:22:42 PM by JACK
 * $Id$
 * 
 * visit: http://www.asprise.com/swt
 *****************************************************************************/

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.KeyEvent;
import org.eclipse.swt.events.KeyListener;
import org.eclipse.swt.events.TraverseEvent;
import org.eclipse.swt.events.TraverseListener;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.layout.RowLayout;
import org.eclipse.swt.widgets.Button;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.List;
import org.eclipse.swt.widgets.Shell;

public class FocusTraversal {
    Display display = new Display();
    Shell shell = new Shell(display);

    public FocusTraversal() {
        init();

        shell.pack();
        shell.open();
        //textUser.forceFocus();

        // Set up the event loop.
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch()) {
                // If no more entries in event queue
                display.sleep();
            }
        }

        display.dispose();
    }

    private void init() {
        shell.setLayout(new RowLayout());

        Composite composite1 = new Composite(shell, SWT.BORDER);
        composite1.setLayout(new RowLayout());
        composite1.setBackground(display.getSystemColor(SWT.COLOR_WHITE));

        Button button1 = new Button(composite1, SWT.PUSH);
        button1.setText("Button1");

        List list = new List(composite1, SWT.MULTI | SWT.BORDER);
        list.setItems(new String[] { "Item-1", "Item-2", "Item-3" });

        Button radioButton1 = new Button(composite1, SWT.RADIO);
        radioButton1.setText("radio-1");
        Button radioButton2 = new Button(composite1, SWT.RADIO);
        radioButton2.setText("radio-2");

        Composite composite2 = new Composite(shell, SWT.BORDER);
        composite2.setLayout(new RowLayout());
        composite2.setBackground(display.getSystemColor(SWT.COLOR_GREEN));

        Button button2 = new Button(composite2, SWT.PUSH);
        button2.setText("Button2");

        final Canvas canvas = new Canvas(composite2, SWT.NULL);
        canvas.setSize(50, 50);
        canvas.setBackground(display.getSystemColor(SWT.COLOR_YELLOW));

        Combo combo = new Combo(composite2, SWT.DROP_DOWN);
        combo.add("combo");
        combo.select(0);

        canvas.addKeyListener(new KeyListener() {
            public void keyPressed(KeyEvent e) {
                GC gc = new GC(canvas);
                // Erase background first. 
                Rectangle rect = canvas.getClientArea();
                gc.fillRectangle(rect.x, rect.y, rect.width, rect.height);

                Font font = new Font(display, "Arial", 32, SWT.BOLD);
                gc.setFont(font);

                gc.drawString("" + e.character, 15, 10);

                gc.dispose();
                font.dispose();
            }

            public void keyReleased(KeyEvent e) {
            }
        });

        canvas.addTraverseListener(new TraverseListener() {
            public void keyTraversed(TraverseEvent e) {
                if (e.detail == SWT.TRAVERSE_TAB_NEXT || e.detail == SWT.TRAVERSE_TAB_PREVIOUS)
                    e.doit = true;
            }
        });

        composite1.setTabList(new Control[] { button1, list });
        composite2.setTabList(new Control[] { button2, canvas, combo });

        shell.setTabList(new Control[] { composite2, composite1 });
    }

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