Java tutorial
/////////////////////////////////////////////////////////////////////////////// // // PACKAGE : com.astra.ses.spell.gui.views.controls.watchvariables // // FILE : WatchVariablesMenuManager.java // // DATE : 2010-08-26 // // Copyright (C) 2008, 2011 SES ENGINEERING, Luxembourg S.A.R.L. // // By using this software in any way, you are agreeing to be bound by // the terms of this license. // // 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 // // NO WARRANTY // EXCEPT AS EXPRESSLY SET FORTH IN THIS AGREEMENT, THE PROGRAM IS PROVIDED // ON AN "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, EITHER // EXPRESS OR IMPLIED INCLUDING, WITHOUT LIMITATION, ANY WARRANTIES OR // CONDITIONS OF TITLE, NON-INFRINGEMENT, MERCHANTABILITY OR FITNESS FOR A // PARTICULAR PURPOSE. Each Recipient is solely responsible for determining // the appropriateness of using and distributing the Program and assumes all // risks associated with its exercise of rights under this Agreement , // including but not limited to the risks and costs of program errors, // compliance with applicable laws, damage to or loss of data, programs or // equipment, and unavailability or interruption of operations. // // DISCLAIMER OF LIABILITY // EXCEPT AS EXPRESSLY SET FORTH IN THIS AGREEMENT, NEITHER RECIPIENT NOR ANY // CONTRIBUTORS SHALL HAVE ANY LIABILITY FOR ANY DIRECT, INDIRECT, INCIDENTAL, // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING WITHOUT LIMITATION // LOST PROFITS), HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN // CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) // ARISING IN ANY WAY OUT OF THE USE OR DISTRIBUTION OF THE PROGRAM OR THE // EXERCISE OF ANY RIGHTS GRANTED HEREUNDER, EVEN IF ADVISED OF THE // POSSIBILITY OF SUCH DAMAGES. // // Contributors: // SES ENGINEERING - initial API and implementation and/or initial documentation // // PROJECT : SPELL // // SUBPROJECT: SPELL GUI Client // /////////////////////////////////////////////////////////////////////////////// package com.astra.ses.spell.gui.views.controls.watchvariables; import org.eclipse.jface.viewers.IStructuredContentProvider; import org.eclipse.jface.viewers.IStructuredSelection; import org.eclipse.jface.viewers.TableViewer; import org.eclipse.swt.SWT; import org.eclipse.swt.events.MenuEvent; import org.eclipse.swt.events.MenuListener; import org.eclipse.swt.events.SelectionAdapter; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.widgets.Menu; import org.eclipse.swt.widgets.MenuItem; import com.astra.ses.spell.gui.model.watchvariables.WatchVariablesSelection; /******************************************************************************* * * {@link WathcVariablesMenuManager} manages the tables's popup menu * ******************************************************************************/ public class WatchVariablesMenuManager { /** Viewer handle */ private TableViewer m_viewer; /** Watch page */ private WatchVariablesPage m_page; /** Menu */ private Menu m_menu; /*************************************************************************** * Constructor * * @param parent **************************************************************************/ public WatchVariablesMenuManager(TableViewer viewer, WatchVariablesPage page) { m_viewer = viewer; m_page = page; m_menu = new Menu(viewer.getTable()); m_menu.addMenuListener(new MenuListener() { @Override public void menuShown(MenuEvent e) { fillMenu(); } @Override public void menuHidden(MenuEvent e) { } }); viewer.getTable().setMenu(m_menu); } /************************************************************************** * Fill the menu with the appropiate actions *************************************************************************/ private void fillMenu() { /* * Remove current items from the menu */ for (MenuItem item : m_menu.getItems()) { item.dispose(); } // First thing, if there are no elements, do not build the menu IStructuredContentProvider provider = (IStructuredContentProvider) m_viewer.getContentProvider(); Object[] allElements = provider.getElements(null); if (allElements.length == 0) return; // See if there is an element registered in the whole table, no matter // if selected boolean atLeastOneRegistered = WatchVariablesSelection.anyRegistered(allElements); // Now check the selection IStructuredSelection sel = (IStructuredSelection) m_viewer.getSelection(); // Will be false if any of the items selected is not registered boolean allSelectedRegistered = WatchVariablesSelection.allRegistered(sel); // Will be false if any of the items selected is registered boolean noneSelectedRegistered = WatchVariablesSelection.noneRegistered(sel); if (sel.size() > 0) // At lease one item selected { if (allSelectedRegistered) { MenuItem unsubscribe = new MenuItem(m_menu, SWT.PUSH); unsubscribe.setText("Remove watch"); unsubscribe.addSelectionListener(new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent e) { m_page.unsubscribeSelected(); } }); } else if (noneSelectedRegistered) { MenuItem unsubscribe = new MenuItem(m_menu, SWT.PUSH); unsubscribe.setText("Add watch"); unsubscribe.addSelectionListener(new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent e) { m_page.subscribeSelected(); } }); } if (atLeastOneRegistered) { MenuItem unsubscribe = new MenuItem(m_menu, SWT.PUSH); unsubscribe.setText("Remove all watches"); unsubscribe.addSelectionListener(new SelectionAdapter() { @Override public void widgetSelected(SelectionEvent e) { m_page.unsubscribeAll(); } }); } } } }