org.eclipse.swt.snippets.Snippet310.java Source code

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Here is the source code for org.eclipse.swt.snippets.Snippet310.java

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/*******************************************************************************
 * Copyright (c) 2009, 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;

/*
 * Spinner example snippet: validate input in a spinner widget
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 *
 * @since 3.5
 */

import org.eclipse.swt.*;
import org.eclipse.swt.graphics.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;

public class Snippet310 {
    public static void main(String[] args) {
        final Display display = new Display();
        final Shell shell = new Shell(display);
        shell.setText("Snippet 310");
        shell.setLayout(new GridLayout());
        final Spinner spinner = new Spinner(shell, SWT.BORDER);
        spinner.setValues(0, -100, 100, 0, 1, 10);
        spinner.setLayoutData(new GridData(200, SWT.DEFAULT));
        final ToolTip toolTip = new ToolTip(shell, SWT.BALLOON | SWT.ICON_WARNING);
        spinner.addModifyListener(e -> {
            String string = spinner.getText();
            String message = null;
            try {
                int value = Integer.parseInt(string);
                int maximum = spinner.getMaximum();
                int minimum = spinner.getMinimum();
                if (value > maximum) {
                    message = "Current input is greater than the maximum limit (" + maximum + ")";
                } else if (value < minimum) {
                    message = "Current input is less than the minimum limit (" + minimum + ")";
                }
            } catch (Exception ex) {
                message = "Current input is not numeric";
            }
            if (message != null) {
                spinner.setForeground(display.getSystemColor(SWT.COLOR_RED));
                Rectangle rect = spinner.getBounds();
                GC gc = new GC(spinner);
                Point pt = gc.textExtent(string);
                gc.dispose();
                toolTip.setLocation(display.map(shell, null, rect.x + pt.x, rect.y + rect.height));
                toolTip.setMessage(message);
                toolTip.setVisible(true);
            } else {
                toolTip.setVisible(false);
                spinner.setForeground(null);
            }
        });
        shell.setSize(300, 100);
        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch()) {
                display.sleep();
            }
        }
        display.dispose();
    }
}