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 =
       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.compare(value1, value2) < 0) {
               String[] values = {items[i].getText(0), items[i].getText(1)};
               items[i].dispose();
               TableItem item1 = new TableItem(table, SWT.NONE, j);
               item1.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.computeSize(SWT.DEFAULT, SWT.DEFAULT).x, 300);
   shell.open();
   while (!shell.isDisposed()) {
     if (!display.readAndDispatch()) display.sleep();
   }
   display.dispose();
 }
  public Shell open(Display display) {
    shell = new Shell(display);
    shell.setLayout(new FillLayout());
    shell.addShellListener(
        new ShellAdapter() {
          @Override
          public void shellClosed(ShellEvent e) {
            e.doit = closeAddressBook();
          }
        });

    createMenuBar();

    searchDialog = new SearchDialog(shell);
    searchDialog.setSearchAreaNames(columnNames);
    searchDialog.setSearchAreaLabel(resAddressBook.getString("Column"));
    searchDialog.addFindListener(
        new FindListener() {
          public boolean find() {
            return findEntry();
          }
        });

    table = new Table(shell, SWT.SINGLE | SWT.BORDER | SWT.FULL_SELECTION);
    table.setHeaderVisible(true);
    table.setMenu(createPopUpMenu());
    table.addSelectionListener(
        new SelectionAdapter() {
          @Override
          public void widgetDefaultSelected(SelectionEvent e) {
            TableItem[] items = table.getSelection();
            if (items.length > 0) editEntry(items[0]);
          }
        });
    for (int i = 0; i < columnNames.length; i++) {
      TableColumn column = new TableColumn(table, SWT.NONE);
      column.setText(columnNames[i]);
      column.setWidth(150);
      final int columnIndex = i;
      column.addSelectionListener(
          new SelectionAdapter() {
            @Override
            public void widgetSelected(SelectionEvent e) {
              sort(columnIndex);
            }
          });
    }

    newAddressBook();

    shell.setSize(table.computeSize(SWT.DEFAULT, SWT.DEFAULT).x, 300);
    shell.open();
    return shell;
  }
  private void createComp(Composite group) {

    GridLayout layout = new GridLayout(1, false);
    layout.verticalSpacing = 10;
    group.setLayout(layout);

    // TableViewer是通过Table来布局的
    // 制作表格   MULTI可多选  H_SCROLL有水平 滚动条、V_SCROLL有垂直滚动条、BORDER有边框、FULL_SELECTION整行选择
    table = new Table(group, SWT.SINGLE | SWT.FULL_SELECTION | SWT.BORDER | SWT.VIRTUAL); // 注意此处的设置
    TableLayout tableLayout = new TableLayout();
    table.setLayout(tableLayout);

    // 指定Table单元格的宽度和高度
    table.addListener(
        SWT.MeasureItem,
        new Listener() { // 向表格增加一个SWT.MeasureItem监听器,每当需要单元内容的大小的时候就会被调用。
          public void handleEvent(Event event) {
            event.width = table.getGridLineWidth(); // 设置宽度
            event.height =
                (int) Math.floor(event.gc.getFontMetrics().getHeight() * 1.5); // 设置高度为字体高度的1.5倍
          }
        });

    // 表格的视图
    tableViewer = new TableViewer(table);
    // 标题和网格线可见
    tableViewer.getTable().setLinesVisible(true);
    tableViewer.getTable().setHeaderVisible(true);
    // 设置填充
    // GridData data = new GridData(SWT.LEFT,SWT.CENTER, true, false);//SWT.FILL, SWT.FILL, true,
    // false  xbm
    GridData data = new GridData(GridData.FILL_BOTH);
    data.widthHint = 350;
    data.heightHint = 295;
    data.grabExcessHorizontalSpace = true;
    tableViewer.getTable().setLayoutData(data); // 表格的布局

    // 创建表格列的标题
    int width = 1;
    for (int i = 0; i < stationData.getColumnCount(); i++) {
      width = stationData.getColumnWidth(i);
      TableColumn column = new TableColumn(table, SWT.NONE);
      column.setWidth((int) (width * 8));
      column.setText(stationData.getColumnHeads()[i]); // 设置表头
      column.setAlignment(SWT.LEFT); // 对齐方式SWT.LEFT
      if (i == 0) // 站名
      {
        // 列的选择事件  实现排序
        column.addSelectionListener(
            new SelectionAdapter() {
              boolean sortType = true; // sortType记录上一次的排序方式,默认为升序

              public void widgetSelected(SelectionEvent e) {
                sortType = !sortType; // 取反。下一次排序方式要和这一次的相反
                tableViewer.setSorter(new StationSorter(sortType, stationData.columnHeads[0]));
              }
            });
      }
    }

    /*tableLayout.addColumnData(new ColumnWeightData(8, 8, false));//设置列宽为8像素
     TableColumn column_one = new TableColumn(table, SWT.NONE);//SWT.LEFT
     column_one.setText(stationData.COLUMN_HEADINGS[0]);//设置表头
     column_one.setAlignment(SWT.LEFT);//对齐方式SWT.LEFT
     column.setWidth(10);//宽度
    */

    // 设置标题的提供者
    tableViewer.setLabelProvider(new TableLabelProvider());

    // 设置表格视图的内容提供者
    tableViewer.setContentProvider(new TableContentProvider());

    // 设置列的属性.
    tableViewer.setColumnProperties(stationData.columnHeads);

    // 定义每一列的别名
    tableViewer.setColumnProperties(new String[] {"name", "down", "up", "map"});

    // 设置每一列的单元格编辑组件CellEditor
    CellEditor[] celleditors = new CellEditor[5];
    // 文本编辑框
    celleditors[0] = null;
    celleditors[1] = new TextCellEditor(table);
    celleditors[2] = new TextCellEditor(table);
    // CheckboxCellEditor(table) 复选框
    celleditors[3] = new ComboBoxCellEditor(table, StationData.MAPS, SWT.READ_ONLY); // 下拉框

    Text text = (Text) celleditors[1].getControl(); // 设置第down列只能输入数值
    text.addVerifyListener(
        new VerifyListener() {
          public void verifyText(VerifyEvent e) {
            // 输入控制键,输入中文,输入字符,输入数字 正整数验证
            Pattern pattern = Pattern.compile("[0-9]\\d*"); // 正则表达式
            Matcher matcher = pattern.matcher(e.text);
            if (matcher.matches()) // 处理数字
            {
              /*if(Integer.parseInt(e.text) != 0)//确保输入的数字不是0
              			e.doit = true;
              		else
              			e.doit = false;
              */
              e.doit = true;
            } else if (e.text.length() > 0) // 字符: 包含中文、空格
            e.doit = false;
            else // 控制键
            e.doit = true;
          }
        });

    Text text1 = (Text) celleditors[2].getControl(); // 设置第up列只能输入数值
    text1.addVerifyListener(
        new VerifyListener() {
          public void verifyText(VerifyEvent e) {
            String inStr = e.text;
            if (inStr.length() > 0) {
              e.doit = NumberUtils.isDigits(inStr);
            }
          }
        });

    table.addMouseMoveListener(
        new MouseMoveListener() {
          public void mouseMove(MouseEvent e) {
            if (StationData.reloadFlag) {
              getStationInfo();
              openCurrentTable(row);
              StationData.reloadFlag = false;
              // System.out.println("entry");
            }
          }
        });
    /*table.addFocusListener(new FocusListener(){
    public void focusGained(FocusEvent e) {
    	getStationInfo();
    	openCurrentTable(row);
    }
    @Override
    public void focusLost(FocusEvent e) {
    }
      });
         */
    tableViewer.setCellEditors(celleditors);

    // 设置单元的更改器
    tableViewer.setCellModifier(new TableCellModifier());

    tableViewer.addFilter(new TableViewerFilter()); // 过滤器

    // 构造工具条
    Composite buttonComposite = new Composite(group, SWT.NONE);
    buttonComposite.setLayoutData(new GridData(SWT.CENTER, SWT.CENTER, false, false)); // 使工具条居中
    Action actionModify =
        new Action("更新") {
          public void run() {
            // 取得用户所选择的第一行, 若没有选择则为null
            IStructuredSelection selection = (IStructuredSelection) tableViewer.getSelection();
            // 获取选中的第一行数据
            Station station = (Station) selection.getFirstElement();
            if (station != null) {
              if (updateStationInfo(
                  station.getStation_downnumber(),
                  station.getStation_upnumber(),
                  station.getStation_graph(),
                  station.getStation_name())) {
                showMsg("成功更新!");
                // 表格的刷新方法,界面会重新读取数据并显示

                pushCommand();

                tableViewer.refresh(); // false
              } else {
                showMsg("更新失败!");
                // tableViewer.refresh();//false
              }
            } else {
              showMsg("请选取进行更新的行!");
            }
          }
        };

    Action actionDelete =
        new Action("删除") {
          public void run() {
            // 取得用户所选择的第一行, 若没有选择则为null
            IStructuredSelection selection = (IStructuredSelection) tableViewer.getSelection();
            // 获取选中的第一个数据
            Station station = (Station) selection.getFirstElement();
            if (station != null) {
              // 先预先移动到下一行
              Table table = tableViewer.getTable();

              // int i = table.getSelectionIndex(); //取得当前所选行的序号,如没有则返回-1
              // table.setSelection(i + 1); //当前选择行移下一行
              // 确认删除
              MessageBox messageBox =
                  new MessageBox(shell, SWT.YES | SWT.NO | SWT.ICON_INFORMATION);
              messageBox.setText("提示信息");
              messageBox.setMessage("确定要删除此记录吗?");
              // SWT.YES 是  // SWT.NO 否 // SWT.CANCEL 取消 // SWT.RETRY 重试// SWT.ABORT 放弃// SWT.IGNORE
              // 忽略
              if (messageBox.open() == SWT.YES) {
                if (deleteStationInfo(station.getStation_name())) // 从数据库中删除记录
                {
                  // showMsg("成功删除!");
                  ((List) tableViewer.getInput()).remove(station); // 数据模型的List容器中删除
                  stationData.remove(station.getStation_name());
                  openCurrentTable(row);
                  tableViewer.remove(station); // 从表格界面上删除

                  pushCommand();
                } else showMsg("删除失败!");
              }
            } else {
              showMsg("请选取要删除的纪录!");
            }
          }
        };

    Action actionClear = new Action("清空") { // 清除所显示内容,点击保存后更新库
          public void run() {
            if (clearStationInfo()) {
              showMsg("清空操作成功!");
              stationData.removeAll();
              openCurrentTable(row);

              pushCommand();
            } else showMsg("清空操作失败!");
          }
        };
    Action actionHelp =
        new Action("帮助") {
          public void run() {
            String str = "更新:\n\r" + "先对某行内容进行修改,然后点击更新进行保存\n\r" + "清空:\n\r" + "从库中物理删除所有记录";
            showMsg(str);
          }
        };

    Action nextPage =
        new Action("下一页") {
          public void run() {
            row++;
            if (row > stationData.getTotalPageNum()) {
              row--;
              return;
            }
            openCurrentTable(row);
          }
        };
    Action prevPage =
        new Action("上一页") {
          public void run() {
            row--;
            if (row < 1) {
              row++;
              return;
            }
            openCurrentTable(row);
          }
        };

    Action refresh =
        new Action("刷新") {
          public void run() {
            getStationInfo();
            openCurrentTable(row);
          }
        };

    // 工具条
    ToolBar toolBar = new ToolBar(buttonComposite, SWT.FLAT | SWT.RIGHT); // |SWT.BORDER

    // 工具条管理器
    ToolBarManager manager = new ToolBarManager(toolBar);

    // manager.add(refresh);
    // manager.add(new Separator());

    manager.add(nextPage);
    manager.add(prevPage);

    manager.add(new Separator());

    manager.add(actionModify);
    manager.add(actionDelete);
    manager.add(actionClear);
    manager.add(new Separator());
    manager.add(actionHelp);
    manager.update(true);

    // 选中某行时,改变行的颜色
    table.addListener(
        SWT.EraseItem,
        new Listener() {
          public void handleEvent(Event event) {
            event.detail &= ~SWT.HOT;
            if ((event.detail & SWT.SELECTED) == 0) return;
            int clientWidth = table.getClientArea().width;
            GC gc = event.gc;
            Color oldForeground = gc.getForeground();
            Color oldBackground = gc.getBackground();
            gc.setForeground(red);
            // gc.setBackground(yellow);
            gc.fillGradientRectangle(0, event.y, clientWidth, event.height, false);
            gc.setForeground(oldForeground);
            gc.setBackground(oldBackground);
            event.detail &= ~SWT.SELECTED;
          }
        });

    // 在tableviewer内部为数据记录和tableItem之间的映射创建一个hash表,这样可以加快tableItem的和记录间的查找速度
    // 必须保证存在要显示的数据,否则程序出错。所以这里不能用下面的语句
    // tableViewer.setUseHashlookup(true);//必须在setInput之前加入才有效
    // 从服务器获取数据
    getStationInfo();
    // 通过setInput为table添加了一个list后,只要对这个list里的元素进行添加和删除,
    // table中的数据就会自动添加和删除,当然每次操作后需要调用refresh方法对tableviewer进行刷新。
    // 打开界面所显示的内容
    tableViewer.setInput(stationData.getData()); // 自动输入数据   即将数据显示在表格中
    tableViewer.setItemCount(stationData.PAGE_SIZE); // 设置显示的Item数
  } //// createComp
  public Shell open(Display display) {

    // Window dressing - the icon
    windowIcon =
        new Image(display, getClass().getClassLoader().getResourceAsStream("icons/joanju.gif"));

    shell = new Shell(display);
    shell.setLayout(new FillLayout());
    shell.addShellListener(
        new ShellAdapter() {
          public void shellClosed(ShellEvent e) {
            e.doit = closeAddressBook();
          }
        });

    shell.setImage(windowIcon);

    createMenuBar();

    searchDialog = new SearchDialog(shell);
    searchDialog.setSearchAreaNames(columnNames);
    searchDialog.setSearchAreaLabel(resMessages.getString("Column"));
    searchDialog.addFindListener(
        new FindListener() {
          public boolean find() {
            return findEntry();
          }
        });

    table = new Table(shell, SWT.SINGLE | SWT.BORDER | SWT.FULL_SELECTION);
    table.setHeaderVisible(true);
    table.setMenu(createPopUpMenu());
    table.addSelectionListener(
        new SelectionAdapter() {
          public void widgetDefaultSelected(SelectionEvent e) {
            TableItem[] items = table.getSelection();
            if (items.length > 0) launchEditor(items[0]);
          }
        });
    int[] widths = {150, 50, 200, 200};
    for (int i = 0; i < columnNames.length; i++) {
      TableColumn column = new TableColumn(table, SWT.NONE);
      column.setText(columnNames[i]);
      column.setWidth(widths[i]);
      final int columnIndex = i;
      column.addSelectionListener(
          new SelectionAdapter() {
            public void widgetSelected(SelectionEvent e) {
              sort(columnIndex);
            }
          });
    }

    newAddressBook();

    shell.addDisposeListener(
        new DisposeListener() {
          public void widgetDisposed(DisposeEvent e) {
            windowIcon.dispose();
          }
        });

    shell.setSize(table.computeSize(SWT.DEFAULT, SWT.DEFAULT).x, 300);
    shell.open();
    return shell;
  }
  /** @see PreferencePage#createContents(Composite) */
  protected Control createContents(Composite ancestor) {
    Composite parent = new Composite(ancestor, SWT.NULL);
    GridLayout layout = new GridLayout();
    layout.numColumns = 2;
    layout.marginHeight = 0;
    layout.marginWidth = 0;
    parent.setLayout(layout);

    // layout the top table & its buttons
    Label label = new Label(parent, SWT.LEFT);
    label.setText(XMLCompareMessages.XMLComparePreference_topTableLabel);
    GridData data = new GridData();
    data.horizontalAlignment = GridData.FILL;
    data.horizontalSpan = 2;
    label.setLayoutData(data);

    fIdMapsTable = new Table(parent, SWT.SINGLE | SWT.BORDER | SWT.FULL_SELECTION);
    fIdMapsTable.setHeaderVisible(true);
    data = new GridData(GridData.FILL_BOTH);
    data.heightHint = fIdMapsTable.getItemHeight() * 4;
    fIdMapsTable.setLayoutData(data);
    fIdMapsTable.addSelectionListener(
        new SelectionAdapter() {
          public void widgetSelected(SelectionEvent e) {
            selectionChanged();
          }
        });

    String column2Text = XMLCompareMessages.XMLComparePreference_topTableColumn2;
    String column3Text = XMLCompareMessages.XMLComparePreference_topTableColumn3;
    ColumnLayoutData columnLayouts[] = {
      new ColumnWeightData(1),
      new ColumnPixelData(convertWidthInCharsToPixels(column2Text.length() + 2), true),
      new ColumnPixelData(convertWidthInCharsToPixels(column3Text.length() + 5), true)
    };
    TableLayout tablelayout = new TableLayout();
    fIdMapsTable.setLayout(tablelayout);
    for (int i = 0; i < 3; i++) tablelayout.addColumnData(columnLayouts[i]);
    TableColumn column = new TableColumn(fIdMapsTable, SWT.NONE);
    column.setText(XMLCompareMessages.XMLComparePreference_topTableColumn1);
    column = new TableColumn(fIdMapsTable, SWT.NONE);
    column.setText(column2Text);
    column = new TableColumn(fIdMapsTable, SWT.NONE);
    column.setText(column3Text);

    fillIdMapsTable();

    Composite buttons = new Composite(parent, SWT.NULL);
    buttons.setLayout(new GridLayout());
    data = new GridData();
    data.verticalAlignment = GridData.FILL;
    data.horizontalAlignment = GridData.FILL;
    buttons.setLayoutData(data);

    fAddIdMapButton = new Button(buttons, SWT.PUSH);
    fAddIdMapButton.setText(XMLCompareMessages.XMLComparePreference_topAdd);
    fAddIdMapButton.addSelectionListener(
        new SelectionAdapter() {
          public void widgetSelected(SelectionEvent e) {
            addIdMap(fAddIdMapButton.getShell());
          }
        });
    data = new GridData();
    data.horizontalAlignment = GridData.FILL;
    // data.heightHint = convertVerticalDLUsToPixels(IDialogConstants.BUTTON_HEIGHT);
    int widthHint = convertHorizontalDLUsToPixels(IDialogConstants.BUTTON_WIDTH);
    data.widthHint =
        Math.max(widthHint, fAddIdMapButton.computeSize(SWT.DEFAULT, SWT.DEFAULT, true).x);
    fAddIdMapButton.setLayoutData(data);

    fRenameIdMapButton = new Button(buttons, SWT.PUSH);
    fRenameIdMapButton.setText(XMLCompareMessages.XMLComparePreference_topRename);
    fRenameIdMapButton.addSelectionListener(
        new SelectionAdapter() {
          public void widgetSelected(SelectionEvent e) {
            renameIdMap(fRenameIdMapButton.getShell());
          }
        });
    data = new GridData();
    data.horizontalAlignment = GridData.FILL;
    // data.heightHint = convertVerticalDLUsToPixels(IDialogConstants.BUTTON_HEIGHT);
    widthHint = convertHorizontalDLUsToPixels(IDialogConstants.BUTTON_WIDTH);
    data.widthHint =
        Math.max(widthHint, fAddIdMapButton.computeSize(SWT.DEFAULT, SWT.DEFAULT, true).x);
    fRenameIdMapButton.setLayoutData(data);

    fRemoveIdMapButton = new Button(buttons, SWT.PUSH);
    fRemoveIdMapButton.setText(XMLCompareMessages.XMLComparePreference_topRemove);
    fRemoveIdMapButton.addSelectionListener(
        new SelectionAdapter() {
          public void widgetSelected(SelectionEvent e) {
            removeIdMap(fRemoveIdMapButton.getShell());
          }
        });
    data = new GridData();
    data.horizontalAlignment = GridData.FILL;
    // data.heightHint = convertVerticalDLUsToPixels(IDialogConstants.BUTTON_HEIGHT);
    widthHint = convertHorizontalDLUsToPixels(IDialogConstants.BUTTON_WIDTH);
    data.widthHint =
        Math.max(widthHint, fRemoveIdMapButton.computeSize(SWT.DEFAULT, SWT.DEFAULT, true).x);
    fRemoveIdMapButton.setLayoutData(data);

    createSpacer(buttons);

    fEditIdMapButton = new Button(buttons, SWT.PUSH);
    fEditIdMapButton.setText(XMLCompareMessages.XMLComparePreference_topEdit);
    fEditIdMapButton.addSelectionListener(
        new SelectionAdapter() {
          public void widgetSelected(SelectionEvent e) {
            editIdMap(fEditIdMapButton.getShell());
          }
        });
    data = new GridData();
    data.horizontalAlignment = GridData.FILL;
    // data.heightHint = convertVerticalDLUsToPixels(IDialogConstants.BUTTON_HEIGHT);
    widthHint = convertHorizontalDLUsToPixels(IDialogConstants.BUTTON_WIDTH);
    data.widthHint =
        Math.max(widthHint, fEditIdMapButton.computeSize(SWT.DEFAULT, SWT.DEFAULT, true).x);
    fEditIdMapButton.setLayoutData(data);

    // Spacer
    label = new Label(parent, SWT.LEFT);
    data = new GridData();
    data.horizontalAlignment = GridData.FILL;
    data.horizontalSpan = 2;
    label.setLayoutData(data);

    // layout the middle table & its buttons
    label = new Label(parent, SWT.LEFT);
    label.setText(XMLCompareMessages.XMLComparePreference_middleTableLabel);
    data = new GridData();
    data.horizontalAlignment = GridData.FILL;
    data.horizontalSpan = 2;
    label.setLayoutData(data);

    fMappingsTable = new Table(parent, SWT.SINGLE | SWT.BORDER | SWT.FULL_SELECTION);
    fMappingsTable.setHeaderVisible(true);
    data = new GridData(GridData.FILL_BOTH);
    data.heightHint = fMappingsTable.getItemHeight() * 4;
    data.widthHint = convertWidthInCharsToPixels(70);
    fMappingsTable.setLayoutData(data);

    column3Text = XMLCompareMessages.XMLComparePreference_middleTableColumn3;
    String column4Text = XMLCompareMessages.XMLComparePreference_middleTableColumn4;
    columnLayouts =
        new ColumnLayoutData[] {
          new ColumnWeightData(10),
          new ColumnWeightData(18),
          new ColumnPixelData(convertWidthInCharsToPixels(column3Text.length() + 1), true),
          new ColumnPixelData(convertWidthInCharsToPixels(column4Text.length() + 3), true)
        };
    tablelayout = new TableLayout();
    fMappingsTable.setLayout(tablelayout);
    for (int i = 0; i < 4; i++) tablelayout.addColumnData(columnLayouts[i]);
    column = new TableColumn(fMappingsTable, SWT.NONE);
    column.setText(XMLCompareMessages.XMLComparePreference_middleTableColumn1);
    column = new TableColumn(fMappingsTable, SWT.NONE);
    column.setText(XMLCompareMessages.XMLComparePreference_middleTableColumn2);
    column = new TableColumn(fMappingsTable, SWT.NONE);
    column.setText(column3Text);
    column = new TableColumn(fMappingsTable, SWT.NONE);
    column.setText(column4Text);

    buttons = new Composite(parent, SWT.NULL);
    buttons.setLayoutData(new GridData(GridData.VERTICAL_ALIGN_BEGINNING));
    layout = new GridLayout();
    layout.marginHeight = 0;
    layout.marginWidth = 0;
    buttons.setLayout(layout);

    fNewMappingsButton = new Button(buttons, SWT.PUSH);
    fNewMappingsButton.setLayoutData(getButtonGridData(fNewMappingsButton));
    fNewMappingsButton.setText(XMLCompareMessages.XMLComparePreference_middleNew);
    fNewMappingsButton.addSelectionListener(
        new SelectionAdapter() {
          public void widgetSelected(SelectionEvent e) {
            addMapping(fAddIdMapButton.getShell());
          }
        });

    fEditMappingsButton = new Button(buttons, SWT.PUSH);
    fEditMappingsButton.setLayoutData(getButtonGridData(fEditMappingsButton));
    fEditMappingsButton.setText(XMLCompareMessages.XMLComparePreference_middleEdit);
    fEditMappingsButton.addSelectionListener(
        new SelectionAdapter() {
          public void widgetSelected(SelectionEvent e) {
            editMapping(fEditMappingsButton.getShell());
          }
        });

    fRemoveMappingsButton = new Button(buttons, SWT.PUSH);
    fRemoveMappingsButton.setLayoutData(getButtonGridData(fRemoveMappingsButton));
    fRemoveMappingsButton.setText(XMLCompareMessages.XMLComparePreference_middleRemove);
    fRemoveMappingsButton.addSelectionListener(
        new SelectionAdapter() {
          public void widgetSelected(SelectionEvent e) {
            removeMapping(fRemoveMappingsButton.getShell());
          }
        });

    createSpacer(buttons);

    // layout the botton table & its buttons
    label = new Label(parent, SWT.LEFT);
    label.setText(XMLCompareMessages.XMLComparePreference_bottomTableLabel);
    data = new GridData();
    data.horizontalAlignment = GridData.FILL;
    data.horizontalSpan = 2;
    label.setLayoutData(data);

    fOrderedTable = new Table(parent, SWT.SINGLE | SWT.BORDER | SWT.FULL_SELECTION);
    fOrderedTable.setHeaderVisible(true);
    data = new GridData(GridData.FILL_BOTH);
    data.heightHint = fOrderedTable.getItemHeight() * 2;
    data.widthHint = convertWidthInCharsToPixels(70);
    fOrderedTable.setLayoutData(data);

    columnLayouts = new ColumnLayoutData[] {new ColumnWeightData(1), new ColumnWeightData(1)};
    tablelayout = new TableLayout();
    fOrderedTable.setLayout(tablelayout);
    for (int i = 0; i < 2; i++) tablelayout.addColumnData(columnLayouts[i]);
    column = new TableColumn(fOrderedTable, SWT.NONE);
    column.setText(XMLCompareMessages.XMLComparePreference_bottomTableColumn1);
    column = new TableColumn(fOrderedTable, SWT.NONE);
    column.setText(XMLCompareMessages.XMLComparePreference_bottomTableColumn2);

    buttons = new Composite(parent, SWT.NULL);
    buttons.setLayoutData(new GridData(GridData.VERTICAL_ALIGN_BEGINNING));
    layout = new GridLayout();
    layout.marginHeight = 0;
    layout.marginWidth = 0;
    buttons.setLayout(layout);

    fNewOrderedButton = new Button(buttons, SWT.PUSH);
    fNewOrderedButton.setLayoutData(getButtonGridData(fNewOrderedButton));
    fNewOrderedButton.setText(XMLCompareMessages.XMLComparePreference_bottomNew);
    fNewOrderedButton.addSelectionListener(
        new SelectionAdapter() {
          public void widgetSelected(SelectionEvent e) {
            addOrdered(fNewOrderedButton.getShell());
          }
        });

    fEditOrderedButton = new Button(buttons, SWT.PUSH);
    fEditOrderedButton.setLayoutData(getButtonGridData(fEditOrderedButton));
    fEditOrderedButton.setText(XMLCompareMessages.XMLComparePreference_bottomEdit);
    fEditOrderedButton.addSelectionListener(
        new SelectionAdapter() {
          public void widgetSelected(SelectionEvent e) {
            editOrdered(fEditOrderedButton.getShell());
          }
        });

    fRemoveOrderedButton = new Button(buttons, SWT.PUSH);
    fRemoveOrderedButton.setLayoutData(getButtonGridData(fRemoveOrderedButton));
    fRemoveOrderedButton.setText(XMLCompareMessages.XMLComparePreference_bottomRemove);
    fRemoveOrderedButton.addSelectionListener(
        new SelectionAdapter() {
          public void widgetSelected(SelectionEvent e) {
            removeOrdered(fRemoveOrderedButton.getShell());
          }
        });

    createSpacer(buttons);

    fIdMapsTable.setSelection(0);
    fIdMapsTable.setFocus();
    selectionChanged();

    return parent;
  }