Java tutorial
/******************************************************************************* * Copyright (c) 2008, 2010 IBM Corporation and others. * 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 * * Contributors: * IBM Corporation - initial API and implementation *******************************************************************************/ package org.eclipse.e4.demo.e4photo; import java.util.Arrays; import java.util.HashMap; import java.util.Map; import javax.annotation.PreDestroy; import javax.inject.Inject; import org.eclipse.core.databinding.observable.IObservable; import org.eclipse.core.databinding.observable.Observables; import org.eclipse.core.databinding.observable.Realm; import org.eclipse.core.databinding.observable.masterdetail.IObservableFactory; import org.eclipse.core.databinding.observable.set.IObservableSet; import org.eclipse.core.databinding.observable.set.WritableSet; import org.eclipse.core.resources.IContainer; import org.eclipse.core.resources.IResource; import org.eclipse.core.resources.IResourceChangeEvent; import org.eclipse.core.resources.IResourceChangeListener; import org.eclipse.core.resources.IResourceDelta; import org.eclipse.core.resources.IResourceDeltaVisitor; import org.eclipse.core.resources.IWorkspace; import org.eclipse.core.resources.ResourcesPlugin; import org.eclipse.core.runtime.CoreException; import org.eclipse.core.runtime.preferences.IEclipsePreferences; import org.eclipse.core.runtime.preferences.InstanceScope; import org.eclipse.e4.ui.di.Focus; import org.eclipse.e4.ui.workbench.modeling.ESelectionService; import org.eclipse.jface.databinding.swt.SWTObservables; import org.eclipse.jface.databinding.viewers.ObservableSetTreeContentProvider; import org.eclipse.jface.databinding.viewers.TreeStructureAdvisor; import org.eclipse.jface.layout.GridLayoutFactory; import org.eclipse.jface.viewers.ISelectionChangedListener; import org.eclipse.jface.viewers.LabelProvider; import org.eclipse.jface.viewers.SelectionChangedEvent; import org.eclipse.jface.viewers.StructuredSelection; import org.eclipse.jface.viewers.TreeViewer; import org.eclipse.jface.viewers.ViewerSorter; import org.eclipse.swt.SWT; import org.eclipse.swt.widgets.Composite; import org.osgi.service.prefs.BackingStoreException; public class Library { Map<IContainer, IObservableSet> observableSets = new HashMap<IContainer, IObservableSet>(); private IResourceChangeListener listener = new IResourceChangeListener() { public void resourceChanged(IResourceChangeEvent event) { if (event.getType() == IResourceChangeEvent.POST_CHANGE) { try { event.getDelta().accept(new IResourceDeltaVisitor() { public boolean visit(IResourceDelta delta) throws CoreException { if (delta.getKind() == IResourceDelta.ADDED) { handleChange(delta.getResource(), delta.getResource().getParent(), true); } else if (delta.getKind() == IResourceDelta.REMOVED) { handleChange(delta.getResource(), delta.getResource().getParent(), false); } return true; } private void handleChange(final IResource resource, final IContainer parent, final boolean added) { final IObservableSet set = observableSets.get(parent); Realm realm = set != null ? set.getRealm() : null; if (realm != null) { realm.asyncExec(new Runnable() { public void run() { if (added) { set.add(resource); } else { set.remove(resource); } } }); } } }); } catch (CoreException e) { // TODO Auto-generated catch block e.printStackTrace(); } } } }; private final IWorkspace workspace; static int counter; @Inject private ESelectionService selectionService; private TreeViewer viewer; @Inject public Library(Composite parent, final IWorkspace workspace) { final Realm realm = SWTObservables.getRealm(parent.getDisplay()); this.workspace = workspace; initializeWorkspace(); viewer = new TreeViewer(parent, SWT.MULTI | SWT.H_SCROLL | SWT.V_SCROLL); viewer.getTree().setData("org.eclipse.e4.ui.css.id", "library"); viewer.addSelectionChangedListener(new ISelectionChangedListener() { public void selectionChanged(SelectionChangedEvent event) { StructuredSelection selection = (StructuredSelection) event.getSelection(); selectionService .setSelection(selection.size() == 1 ? selection.getFirstElement() : selection.toArray()); } }); IObservableFactory setFactory = new IObservableFactory() { public IObservable createObservable(Object element) { if (element instanceof IContainer && ((IContainer) element).exists()) { IObservableSet observableSet = observableSets.get(element); if (observableSet == null) { observableSet = new WritableSet(realm); try { observableSet.addAll(Arrays.asList(((IContainer) element).members())); } catch (CoreException e) { // TODO Auto-generated catch block e.printStackTrace(); } observableSets.put((IContainer) element, observableSet); } return observableSet; } return Observables.emptyObservableSet(); } }; viewer.setContentProvider(new ObservableSetTreeContentProvider(setFactory, new TreeStructureAdvisor() { public Boolean hasChildren(Object element) { return Boolean.valueOf(element instanceof IContainer); } })); viewer.setLabelProvider(new LabelProvider() { public String getText(Object element) { if (element instanceof IResource) return ((IResource) element).getName(); return element == null ? "" : element.toString(); } }); viewer.setSorter(new ViewerSorter()); viewer.setInput(workspace.getRoot()); // Button button = new Button(parent, SWT.PUSH); // button.setText("Create Project"); // button.addSelectionListener(new SelectionListener() { // public void widgetSelected(SelectionEvent e) { // String projectName = "Project" + (counter++); // final IProject project = workspace.getRoot().getProject( // projectName); // final IProjectDescription pd = workspace // .newProjectDescription(projectName); // try { // workspace.run(new IWorkspaceRunnable() { // public void run(IProgressMonitor monitor) // throws CoreException { // project.create(pd, monitor); // project.open(monitor); // } // }, new NullProgressMonitor()); // } catch (CoreException e1) { // // TODO Auto-generated catch block // e1.printStackTrace(); // } // } // // public void widgetDefaultSelected(SelectionEvent e) { // } // }); GridLayoutFactory.fillDefaults().generateLayout(parent); } private void initializeWorkspace() { workspace.addResourceChangeListener(listener); IEclipsePreferences node = new InstanceScope().getNode(ResourcesPlugin.PI_RESOURCES); node.putBoolean(ResourcesPlugin.PREF_AUTO_REFRESH, true); try { node.flush(); } catch (BackingStoreException e) { // TODO Auto-generated catch block e.printStackTrace(); } } @Focus void setFocus() { viewer.getControl().setFocus(); } @PreDestroy public void dispose() { workspace.removeResourceChangeListener(listener); } }