Java Tutorial/SWT/Table Sort

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Sort a table by column

   <source lang="java">

/*******************************************************************************

* Copyright (c) 2000, 2004 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; /*

* Table example snippet: sort a table by column
* 
* For a list of all SWT example snippets see
* http://www.eclipse.org/swt/snippets/
* 
* @since 3.2
*/

import java.text.Collator; import java.util.Locale; 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; public class TableSortByColumn {

 public static void main(String[] args) {
   Display display = new Display();
   Shell shell = new Shell(display);
   shell.setLayout(new FillLayout());
   final Table table = new Table(shell, SWT.BORDER);
   table.setHeaderVisible(true);
   final TableColumn column1 = new TableColumn(table, SWT.NONE);
   column1.setText("Column 1");
   final TableColumn column2 = new TableColumn(table, SWT.NONE);
   column2.setText("Column 2");
   TableItem item = new TableItem(table, SWT.NONE);
   item.setText(new String[] { "a", "3" });
   item = new TableItem(table, SWT.NONE);
   item.setText(new String[] { "b", "2" });
   item = new TableItem(table, SWT.NONE);
   item.setText(new String[] { "c", "1" });
   column1.setWidth(100);
   column2.setWidth(100);
   Listener sortListener = new Listener() {
     public void handleEvent(Event e) {
       TableItem[] items = table.getItems();
       Collator collator = Collator.getInstance(Locale.getDefault());
       TableColumn column = (TableColumn) e.widget;
       int index = column == column1 ? 0 : 1;
       for (int i = 1; i < items.length; i++) {
         String value1 = items[i].getText(index);
         for (int j = 0; j < i; j++) {
           String value2 = items[j].getText(index);
           if (collator.rupare(value1, value2) < 0) {
             String[] values = { items[i].getText(0), items[i].getText(1) };
             items[i].dispose();
             TableItem item = new TableItem(table, SWT.NONE, j);
             item.setText(values);
             items = table.getItems();
             break;
           }
         }
       }
       table.setSortColumn(column);
     }
   };
   column1.addListener(SWT.Selection, sortListener);
   column2.addListener(SWT.Selection, sortListener);
   table.setSortColumn(column1);
   table.setSortDirection(SWT.UP);
   shell.setSize(shell.ruputeSize(SWT.DEFAULT, SWT.DEFAULT).x, 300);
   shell.open();
   while (!shell.isDisposed()) {
     if (!display.readAndDispatch())
       display.sleep();
   }
   display.dispose();
 }

}</source>





Sort table column in two direction with custom Comparator

   <source lang="java">

/*******************************************************************************

* 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.ruparator; 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.ruputeSize(SWT.DEFAULT, SWT.DEFAULT).x, 300);
   shell.open();
   while (!shell.isDisposed()) {
     if (!display.readAndDispatch())
       display.sleep();
   }
   display.dispose();
 }

}</source>