Java tutorial
/******************************************************************************* * Copyright (c) 2006, 2014 Tom Schindl and others. * * This program and the accompanying materials * are made available under the terms of the Eclipse Public License 2.0 * which accompanies this distribution, and is available at * https://www.eclipse.org/legal/epl-2.0/ * * SPDX-License-Identifier: EPL-2.0 * * Contributors: * Tom Schindl - initial API and implementation * Lars Vogel (lars.vogel@gmail.com) - Bug 413427 * Jeanderson Candido (http://jeandersonbc.github.io) - Bug 414565 *******************************************************************************/ package org.eclipse.jface.snippets.viewers; import org.eclipse.jface.viewers.ArrayContentProvider; import org.eclipse.jface.viewers.CellEditor; import org.eclipse.jface.viewers.ColumnLabelProvider; import org.eclipse.jface.viewers.ColumnViewer; import org.eclipse.jface.viewers.EditingSupport; import org.eclipse.jface.viewers.TableViewer; import org.eclipse.jface.viewers.TableViewerColumn; import org.eclipse.jface.viewers.TextCellEditor; 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.layout.FillLayout; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Shell; import org.eclipse.swt.widgets.Table; /** * Example usage of ViewerComparator in tables to allow sorting * * @author Tom Schindl <tom.schindl@bestsolution.at> * */ public class Snippet040TableViewerSorting { public class Person { public String givenname; public String surname; public String email; public Person(String givenname, String surname, String email) { this.givenname = givenname; this.surname = surname; this.email = email; } } protected abstract class AbstractEditingSupport extends EditingSupport { private TextCellEditor editor; public AbstractEditingSupport(TableViewer viewer) { super(viewer); this.editor = new TextCellEditor(viewer.getTable()); } @Override protected boolean canEdit(Object element) { return true; } @Override protected CellEditor getCellEditor(Object element) { return editor; } @Override protected void setValue(Object element, Object value) { doSetValue(element, value); getViewer().update(element, null); } protected abstract void doSetValue(Object element, Object value); } public Snippet040TableViewerSorting(Shell shell) { TableViewer viewer = new TableViewer(shell, SWT.BORDER | SWT.FULL_SELECTION); viewer.setContentProvider(ArrayContentProvider.getInstance()); TableViewerColumn column = createColumnFor(viewer, "Givenname"); column.setLabelProvider(new ColumnLabelProvider() { @Override public String getText(Object element) { return ((Person) element).givenname; } }); column.setEditingSupport(new AbstractEditingSupport(viewer) { @Override protected Object getValue(Object element) { return ((Person) element).givenname; } @Override protected void doSetValue(Object element, Object value) { ((Person) element).givenname = value.toString(); } }); ColumnViewerComparator cSorter = new ColumnViewerComparator(viewer, column) { @Override protected int doCompare(Viewer viewer, Object e1, Object e2) { Person p1 = (Person) e1; Person p2 = (Person) e2; return p1.givenname.compareToIgnoreCase(p2.givenname); } }; column = createColumnFor(viewer, "Surname"); column.setLabelProvider(new ColumnLabelProvider() { @Override public String getText(Object element) { return ((Person) element).surname; } }); column.setEditingSupport(new AbstractEditingSupport(viewer) { @Override protected Object getValue(Object element) { return ((Person) element).surname; } @Override protected void doSetValue(Object element, Object value) { ((Person) element).surname = value.toString(); } }); new ColumnViewerComparator(viewer, column) { @Override protected int doCompare(Viewer viewer, Object e1, Object e2) { Person p1 = (Person) e1; Person p2 = (Person) e2; return p1.surname.compareToIgnoreCase(p2.surname); } }; column = createColumnFor(viewer, "E-Mail"); column.setLabelProvider(new ColumnLabelProvider() { @Override public String getText(Object element) { return ((Person) element).email; } }); column.setEditingSupport(new AbstractEditingSupport(viewer) { @Override protected Object getValue(Object element) { return ((Person) element).email; } @Override protected void doSetValue(Object element, Object value) { ((Person) element).email = value.toString(); } }); new ColumnViewerComparator(viewer, column) { @Override protected int doCompare(Viewer viewer, Object e1, Object e2) { Person p1 = (Person) e1; Person p2 = (Person) e2; return p1.email.compareToIgnoreCase(p2.email); } }; viewer.setInput(createModel()); viewer.getTable().setLinesVisible(true); viewer.getTable().setHeaderVisible(true); cSorter.setSorter(cSorter, ColumnViewerComparator.ASC); } private TableViewerColumn createColumnFor(TableViewer viewer, String label) { TableViewerColumn column = new TableViewerColumn(viewer, SWT.NONE); column.getColumn().setWidth(200); column.getColumn().setText(label); column.getColumn().setMoveable(true); return column; } private Person[] createModel() { return new Person[] { new Person("Tom", "Schindl", "tom.schindl@bestsolution.at"), new Person("Boris", "Bokowski", "Boris_Bokowski@ca.ibm.com"), new Person("Tod", "Creasey", "Tod_Creasey@ca.ibm.com"), new Person("Wayne", "Beaton", "wayne@eclipse.org"), new Person("Jeanderson", "Candido", "jeandersonbc@gmail.com"), new Person("Lars", "Vogel", "Lars.Vogel@gmail.com"), new Person("Hendrik", "Still", "hendrik.still@gammas.de") }; } private static abstract class ColumnViewerComparator extends ViewerComparator { public static final int ASC = 1; public static final int NONE = 0; public static final int DESC = -1; private int direction = 0; private TableViewerColumn column; private ColumnViewer viewer; public ColumnViewerComparator(ColumnViewer viewer, TableViewerColumn column) { this.column = column; this.viewer = viewer; SelectionAdapter selectionAdapter = createSelectionAdapter(); this.column.getColumn().addSelectionListener(selectionAdapter); } private SelectionAdapter createSelectionAdapter() { return new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent e) { if (ColumnViewerComparator.this.viewer.getComparator() != null) { if (ColumnViewerComparator.this.viewer.getComparator() == ColumnViewerComparator.this) { int tdirection = ColumnViewerComparator.this.direction; if (tdirection == ASC) { setSorter(ColumnViewerComparator.this, DESC); } else if (tdirection == DESC) { setSorter(ColumnViewerComparator.this, NONE); } } else { setSorter(ColumnViewerComparator.this, ASC); } } else { setSorter(ColumnViewerComparator.this, ASC); } } }; } public void setSorter(ColumnViewerComparator sorter, int direction) { Table columnParent = column.getColumn().getParent(); if (direction == NONE) { columnParent.setSortColumn(null); columnParent.setSortDirection(SWT.NONE); viewer.setComparator(null); } else { columnParent.setSortColumn(column.getColumn()); sorter.direction = direction; columnParent.setSortDirection(direction == ASC ? SWT.DOWN : SWT.UP); if (viewer.getComparator() == sorter) { viewer.refresh(); } else { viewer.setComparator(sorter); } } } @Override public int compare(Viewer viewer, Object e1, Object e2) { return direction * doCompare(viewer, e1, e2); } protected abstract int doCompare(Viewer viewer, Object e1, Object e2); } /** * @param args */ public static void main(String[] args) { Display display = new Display(); Shell shell = new Shell(display); shell.setLayout(new FillLayout()); new Snippet040TableViewerSorting(shell); shell.open(); while (!shell.isDisposed()) { if (!display.readAndDispatch()) display.sleep(); } display.dispose(); } }