/**
   * Creates the SWT controls for this workbench part.
   *
   * @param parent the parent control
   */
  public void createSection(Composite parent) {
    super.createSection(parent);
    FormToolkit toolkit = getFormToolkit(parent.getDisplay());

    Section section =
        toolkit.createSection(
            parent,
            ExpandableComposite.TWISTIE
                | ExpandableComposite.EXPANDED
                | ExpandableComposite.TITLE_BAR
                | Section.DESCRIPTION
                | ExpandableComposite.FOCUS_TITLE);
    section.setText(Messages.configurationEditorPortsSection);
    section.setDescription(Messages.configurationEditorPortsDescription);
    section.setLayoutData(new GridData(GridData.FILL_HORIZONTAL | GridData.VERTICAL_ALIGN_FILL));

    // ports
    Composite composite = toolkit.createComposite(section);
    GridLayout layout = new GridLayout();
    layout.marginHeight = 8;
    layout.marginWidth = 8;
    composite.setLayout(layout);
    composite.setLayoutData(new GridData(GridData.VERTICAL_ALIGN_FILL | GridData.FILL_HORIZONTAL));
    IWorkbenchHelpSystem whs = PlatformUI.getWorkbench().getHelpSystem();
    whs.setHelp(composite, ContextIds.CONFIGURATION_EDITOR_PORTS);
    toolkit.paintBordersFor(composite);
    section.setClient(composite);

    ports = toolkit.createTable(composite, SWT.V_SCROLL | SWT.H_SCROLL | SWT.FULL_SELECTION);
    ports.setHeaderVisible(true);
    ports.setLinesVisible(true);
    whs.setHelp(ports, ContextIds.CONFIGURATION_EDITOR_PORTS_LIST);

    TableLayout tableLayout = new TableLayout();

    TableColumn col = new TableColumn(ports, SWT.NONE);
    col.setText(Messages.configurationEditorPortNameColumn);
    ColumnWeightData colData = new ColumnWeightData(15, 150, true);
    tableLayout.addColumnData(colData);

    col = new TableColumn(ports, SWT.NONE);
    col.setText(Messages.configurationEditorPortValueColumn);
    colData = new ColumnWeightData(8, 80, true);
    tableLayout.addColumnData(colData);

    GridData data = new GridData(GridData.FILL_HORIZONTAL | GridData.VERTICAL_ALIGN_FILL);
    data.widthHint = 230;
    data.heightHint = 100;
    ports.setLayoutData(data);
    ports.setLayout(tableLayout);

    viewer = new TableViewer(ports);
    viewer.setColumnProperties(new String[] {"name", "port"});

    initialize();
  }
  /** @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;
  }