org.eclipse.swt.snippets.Snippet340.java Source code

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Here is the source code for org.eclipse.swt.snippets.Snippet340.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;

/*
 * Accessibility example snippet: tell a screen reader about updates
 * to a non-focused descriptive area
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 *
 * @since 3.6
 */
import org.eclipse.swt.*;
import org.eclipse.swt.accessibility.*;
import org.eclipse.swt.layout.*;
import org.eclipse.swt.widgets.*;

public class Snippet340 {

    public static void main(String[] args) {
        Display display = new Display();
        Shell shell = new Shell(display);
        shell.setText("Snippet 340");
        shell.setLayout(new GridLayout());
        shell.setText("Description Relation Example");

        // (works with either a Label or a READ_ONLY Text)
        final Label liveLabel = new Label(shell, SWT.BORDER | SWT.READ_ONLY);
        //   final Text liveLabel = new Text(shell, SWT.BORDER | SWT.READ_ONLY);
        liveLabel.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));
        liveLabel.setText("Live region messages go here");

        new Label(shell, SWT.NONE).setText("Type an integer from 1 to 4:");

        final Text textField = new Text(shell, SWT.SINGLE | SWT.BORDER);
        textField.setLayoutData(new GridData(SWT.FILL, SWT.CENTER, true, false));
        textField.addModifyListener(e -> {
            String textValue = textField.getText();
            String message = textValue + " is not valid input.";
            try {
                int value = Integer.parseInt(textValue);
                switch (value) {
                case 1:
                    message = "One for the money,";
                    break;
                case 2:
                    message = "Two for the show,";
                    break;
                case 3:
                    message = "Three to get ready,";
                    break;
                case 4:
                    message = "And four to go!";
                    break;
                }
            } catch (NumberFormatException ex) {
            }
            liveLabel.setText(message);
            textField.getAccessible().sendEvent(ACC.EVENT_DESCRIPTION_CHANGED, null);
            textField.setSelection(0, textField.getCharCount());
        });
        textField.getAccessible().addRelation(ACC.RELATION_DESCRIBED_BY, liveLabel.getAccessible());
        liveLabel.getAccessible().addRelation(ACC.RELATION_DESCRIPTION_FOR, textField.getAccessible());
        textField.getAccessible().addAccessibleListener(new AccessibleAdapter() {
            @Override
            public void getDescription(AccessibleEvent event) {
                event.result = liveLabel.getText();
            }
        });

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