org.eclipse.swt.snippets.Snippet289.java Source code

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Here is the source code for org.eclipse.swt.snippets.Snippet289.java

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/*******************************************************************************
 * Copyright (c) 2000, 2016 IBM Corporation and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.swt.snippets;

/*
 * Combo example snippet: add a new number item to a combo box
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 */
import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;

public class Snippet289 {
    public static void main(String[] args) {
        Display display = new Display();
        Shell shell = new Shell(display);
        shell.setText("Snippet 289");
        shell.setLayout(new FillLayout());
        final Combo combo = new Combo(shell, SWT.NONE);
        combo.setItems("1111", "2222", "3333", "4444");
        combo.setText(combo.getItem(0));
        combo.addVerifyListener(e -> {
            String text = combo.getText();
            String newText = text.substring(0, e.start) + e.text + text.substring(e.end);
            try {
                if (newText.length() != 0)
                    Integer.parseInt(newText);
            } catch (NumberFormatException ex) {
                e.doit = false;
            }
        });
        combo.addTraverseListener(e -> {
            if (e.detail == SWT.TRAVERSE_RETURN) {
                e.doit = false;
                e.detail = SWT.TRAVERSE_NONE;
                String newText = combo.getText();
                try {
                    Integer.parseInt(newText);
                    combo.add(newText);
                    combo.setSelection(new Point(0, newText.length()));
                } catch (NumberFormatException ex) {
                }
            }
        });

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