Ivor Williams

Java:SWT: click on table column header to sort table package ca.freewill.swt.test; import java.util.Arrays; import org.eclipse.jface.viewers.TableViewer; import org.eclipse.jface.viewers.Viewer; import org.eclipse.jface.viewers.ViewerComparator; import org.eclipse.swt.SWT; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.widgets.Table; import org.eclipse.swt.widgets.TableColumn; public class TableSorter { private final TableViewer tableViewer; public TableSorter(TableViewer tableViewer) { this.tableViewer = tableViewer; addColumnSelectionListeners(tableViewer); tableViewer.setComparator(new ViewerComparator() { public int compare(Viewer viewer, Object e1, Object e2) { return compareElements(e1, e2); } }); } private void addColumnSelectionListeners(TableViewer tableViewer) { TableColumn[] columns = tableViewer.getTable().getColumns(); for (int i = 0; i < columns.length; i++) { addColumnSelectionListener(columns[i]); } } private void addColumnSelectionListener(TableColumn column) { column.addSelectionListener(new SelectionAdapter() { public void widgetSelected(SelectionEvent e) { tableColumnClicked((TableColumn) e.widget); } }); } private void tableColumnClicked(TableColumn column) { Table table = column.getParent(); if (column.equals(table.getSortColumn())) { table.setSortDirection(table.getSortDirection() == SWT.UP ? SWT.DOWN : SWT.UP); } else { table.setSortColumn(column); table.setSortDirection(SWT.UP); } tableViewer.refresh(); } private int compareElements(Object e1, Object e2) { IColumnContentProvider columnValueProvider = (IColumnContentProvider) tableViewer.getContentProvider(); Table table = tableViewer.getTable(); int index = Arrays.asList(table.getColumns()).indexOf(table.getSortColumn()); int result = 0; if (index != -1) { Comparable c1 = columnValueProvider.getValue(e1, index); Comparable c2 = columnValueProvider.getValue(e2, index); result = c1.compareTo(c2); } return table.getSortDirection() == SWT.UP ? result : -result; } } // Content provider must implement this interface package ca.freewill.swt.test; public interface IColumnContentProvider { Comparable getValue(Object element, int column); }