org.eclipse.swt.snippets.Snippet192.java Source code

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Here is the source code for org.eclipse.swt.snippets.Snippet192.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;

import java.util.*;

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

/*
 * Show a sort indicator in the column header
 *
 * For a list of all SWT example snippets see
 * http://www.eclipse.org/swt/snippets/
 *
 * @since 3.2
 */

public class Snippet192 {
    public static void main(String[] args) {
        // initialize data with keys and random values
        int size = 100;
        Random random = new Random();
        final int[][] data = new int[size][];
        for (int i = 0; i < data.length; i++) {
            data[i] = new int[] { i, random.nextInt() };
        }
        // create a virtual table to display data
        Display display = new Display();
        Shell shell = new Shell(display);
        shell.setText("Snippet 192");
        shell.setLayout(new FillLayout());
        final Table table = new Table(shell, SWT.VIRTUAL);
        table.setHeaderVisible(true);
        table.setLinesVisible(true);
        table.setItemCount(size);
        final TableColumn column1 = new TableColumn(table, SWT.NONE);
        column1.setText("Key");
        column1.setWidth(200);
        final TableColumn column2 = new TableColumn(table, SWT.NONE);
        column2.setText("Value");
        column2.setWidth(200);
        table.addListener(SWT.SetData, e -> {
            TableItem item = (TableItem) e.item;
            int index = table.indexOf(item);
            int[] datum = data[index];
            item.setText(new String[] { Integer.toString(datum[0]), Integer.toString(datum[1]) });
        });
        // Add sort indicator and sort data when column selected
        Listener sortListener = e -> {
            // determine new sort column and direction
            TableColumn sortColumn = table.getSortColumn();
            TableColumn currentColumn = (TableColumn) e.widget;
            int dir = table.getSortDirection();
            if (sortColumn == currentColumn) {
                dir = dir == SWT.UP ? SWT.DOWN : SWT.UP;
            } else {
                table.setSortColumn(currentColumn);
                dir = SWT.UP;
            }
            // sort the data based on column and direction
            final int index = currentColumn == column1 ? 0 : 1;
            final int direction = dir;
            Arrays.sort(data, (a, b) -> {
                if (a[index] == b[index])
                    return 0;
                if (direction == SWT.UP) {
                    return a[index] < b[index] ? -1 : 1;
                }
                return a[index] < b[index] ? 1 : -1;
            });
            // update data displayed in table
            table.setSortDirection(dir);
            table.clearAll();
        };
        column1.addListener(SWT.Selection, sortListener);
        column2.addListener(SWT.Selection, sortListener);
        table.setSortColumn(column1);
        table.setSortDirection(SWT.UP);
        shell.setSize(shell.computeSize(SWT.DEFAULT, SWT.DEFAULT).x, 300);
        shell.open();
        while (!shell.isDisposed()) {
            if (!display.readAndDispatch())
                display.sleep();
        }
        display.dispose();
    }
}