org.eclipse.swt.snippets.Snippet69.java Source code

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Here is the source code for org.eclipse.swt.snippets.Snippet69.java

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/*******************************************************************************
 * Copyright (c) 2000, 2005 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;

/*
 * FormLayout example snippet: center a label and single line text using a form layout
 *
 * 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 Snippet69 {

    public static void main(String[] args) {
        Display display = new Display();
        Shell shell = new Shell(display);
        shell.setText("Snippet 69");
        Label label = new Label(shell, SWT.NONE | SWT.BORDER);
        label.setText("Name");
        Text text = new Text(shell, SWT.NONE);

        FormLayout layout = new FormLayout();
        layout.marginWidth = layout.marginHeight = 5;
        shell.setLayout(layout);

        GC gc = new GC(text);
        FontMetrics fm = gc.getFontMetrics();
        double charWidth = fm.getAverageCharacterWidth();
        int width = text.computeSize((int) (charWidth * 8), SWT.DEFAULT).x;
        gc.dispose();
        FormData data = new FormData(width, SWT.DEFAULT);
        text.setLayoutData(data);
        data.left = new FormAttachment(label, 5);
        data.top = new FormAttachment(label, 0, SWT.CENTER);

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