Sort table column in two direction with custom Comparator : Table Sort « SWT « Java Tutorial

1. Java Tutorial
2. SWT
3. Table Sort

/*******************************************************************************
 * Copyright (c) 2000, 2005 IBM Corporation and others. All rights reserved.
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 which accompanies this distribution,
 * and is available at http://www.eclipse.org/legal/epl-v10.html
 * 
 * Contributors: IBM Corporation - initial API and implementation
 ******************************************************************************/
// package org.eclipse.swt.snippets;
import java.util.Arrays;
import java.util.Comparator;
import java.util.Random;

import org.eclipse.swt.SWT;
import org.eclipse.swt.layout.FillLayout;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
import org.eclipse.swt.widgets.Shell;
import org.eclipse.swt.widgets.Table;
import org.eclipse.swt.widgets.TableColumn;
import org.eclipse.swt.widgets.TableItem;

/*
 * 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 TableSortTwoDirection {
  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.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, new Listener() {
      public void handleEvent(Event 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 = new Listener() {
      public void handleEvent(Event 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, new Comparator() {
          public int compare(Object arg0, Object arg1) {
            int[] a = (int[]) arg0;
            int[] b = (int[]) arg1;
            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();
  }
}

17.56.Table Sort
	17.56.1.	Sort a table by column
	17.56.2.	Sort table column in two direction with custom Comparator