Java tutorial
/******************************************************************************* * ALMA - Atacama Large Millimeter Array * Copyright (c) ESO - European Southern Observatory, 2013 * (in the framework of the ALMA collaboration). * All rights reserved. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA *******************************************************************************/ package alma.acs.eventbrowser.parts; import javax.annotation.PostConstruct; import javax.annotation.PreDestroy; import javax.inject.Inject; import org.eclipse.core.runtime.IStatus; import org.eclipse.e4.core.contexts.IEclipseContext; import org.eclipse.e4.core.di.annotations.Optional; import org.eclipse.e4.core.services.events.IEventBroker; import org.eclipse.e4.core.services.statusreporter.StatusReporter; import org.eclipse.e4.ui.di.Focus; import org.eclipse.e4.ui.di.UIEventTopic; import org.eclipse.e4.ui.model.application.ui.menu.MPopupMenu; import org.eclipse.e4.ui.workbench.modeling.ESelectionService; import org.eclipse.e4.ui.workbench.swt.modeling.EMenuService; import org.eclipse.jface.viewers.DoubleClickEvent; import org.eclipse.jface.viewers.IDoubleClickListener; import org.eclipse.jface.viewers.ISelectionChangedListener; import org.eclipse.jface.viewers.IStructuredSelection; import org.eclipse.jface.viewers.SelectionChangedEvent; import org.eclipse.jface.viewers.TreeViewer; import org.eclipse.swt.SWT; import org.eclipse.swt.widgets.Composite; import alma.acs.eventbrowser.handlers.NotifyServiceUpdateJob; import alma.acs.eventbrowser.model.EventModel; import alma.acs.eventbrowser.parts.ChannelTreeProviders.ChannelTreeContentProvider; import alma.acs.eventbrowser.parts.ChannelTreeProviders.ChannelTreeLabelProvider; import alma.acs.eventbrowser.status.StatusLineWriter; public class ChannelTreePart { private TreeViewer viewer; @Inject private ESelectionService selectionService; /** * Blocking (popup) status report. */ @Inject private StatusReporter statusReporter; private StatusLineWriter statusLineWriter; private EventModel eventModel; /** * The constructor. */ public ChannelTreePart() { } /** * See http://www.vogella.com/articles/EclipseJFaceTree/article.html */ @PostConstruct public void postConstruct(Composite parent, final IEclipseContext context, EMenuService menuService, IEventBroker eventBroker) { try { eventModel = EventModel.getInstance(); } catch (Throwable thr) { thr.printStackTrace(); IStatus someStatus = statusReporter.newStatus(IStatus.ERROR, "Connection with NCs failed.", thr); statusReporter.report(someStatus, StatusReporter.SHOW); throw new RuntimeException(thr); } // eventModel.getLogger().info("ChannelTreePart got EventModel instance."); statusLineWriter = new StatusLineWriter(eventBroker); viewer = new TreeViewer(parent, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL); viewer.setContentProvider(new ChannelTreeContentProvider()); viewer.setLabelProvider(new ChannelTreeLabelProvider()); // Expand the tree. '2' means to show only the visible top-level nodes. viewer.setAutoExpandLevel(2); viewer.setComparator(new ServiceViewerComparator()); // Provide the root node to the ContentProvider viewer.setInput(eventModel.getNotifyServicesRoot()); // Expand with doubleclick viewer.addDoubleClickListener(new IDoubleClickListener() { @Override public void doubleClick(DoubleClickEvent event) { IStructuredSelection thisSelection = (IStructuredSelection) event.getSelection(); Object selectedNode = thisSelection.getFirstElement(); viewer.setExpandedState(selectedNode, !viewer.getExpandedState(selectedNode)); } }); // Attach a selection listener to our tree that will post selections to the ESelectionService viewer.addSelectionChangedListener(new ISelectionChangedListener() { @Override public void selectionChanged(SelectionChangedEvent event) { IStructuredSelection selection = (IStructuredSelection) event.getSelection(); selectionService .setSelection(selection.size() == 1 ? selection.getFirstElement() : selection.toArray()); } }); // TODO: Take care of help system. Here's the E3 code: // // Create the help context id for the viewer's control // PlatformUI.getWorkbench().getHelpSystem().setHelp(viewer.getControl(), "alma.acs.eventbrowser.viewer"); hookContextMenu(menuService); // TODO: this could be used by handlers etc, currently it's not context.set(ChannelTreePart.class, this); } private void hookContextMenu(EMenuService menuService) { // For the case of popup (mouse) menues we must reference the menu ID from the file Application.e4xmi MPopupMenu menu = menuService.registerContextMenu(viewer.getTree(), "alma.acs.eventgui.popupmenu.channeltree"); if (menu == null) { System.out.println("Damn, failed to register popup menu for the ChannelTreePart tree."); } } @PreDestroy public void preDestroy() { //TODO Your code here } @Focus public void setFocus() { viewer.getTree().setFocus(); } @Inject @Optional private void refreshNotify(@UIEventTopic(NotifyServiceUpdateJob.REFRESH_UI_SIGNAL_NAME) String s) { // System.out.println("ChannelTreePart#refreshNotify() called via IEventBroker"); viewer.refresh(); } }