org.eclipse.swt.snippets.Snippet253.java Source code

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Here is the source code for org.eclipse.swt.snippets.Snippet253.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;

/*
 * Table example snippet: compute the number of visible rows in a table
 *
 * 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 Snippet253 {
    public static void main(String[] args) {
        final Display display = new Display();
        final Shell shell = new Shell(display);
        shell.setText("Snippet 253");
        FillLayout layout = new FillLayout(SWT.VERTICAL);
        shell.setLayout(layout);
        final Table table = new Table(shell, SWT.NONE);
        for (int i = 0; i < 32; i++) {
            TableItem item = new TableItem(table, SWT.NONE);
            item.setText("Item " + (i + 1) + " is quite long");
        }
        final Button button = new Button(shell, SWT.PUSH);
        button.setText("Visible Items []");
        button.addListener(SWT.Selection, e -> {
            Rectangle rect = table.getClientArea();
            int itemHeight = table.getItemHeight();
            int headerHeight = table.getHeaderHeight();
            int visibleCount = (rect.height - headerHeight + itemHeight - 1) / itemHeight;
            button.setText("Visible Items [" + visibleCount + "]");
        });
        shell.setSize(200, 250);
        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
        display.dispose();
    }
}