Java tutorial
/** * Copyright (c) 2002-2006 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 - Initial API and implementation */ package org.eclipse.e4mf.edit.ui.provider; import java.util.Collection; import org.eclipse.emf.common.notify.Notification; import org.eclipse.emf.ecore.ENamedElement; import org.eclipse.emf.ecore.EReference; import org.eclipse.jface.viewers.AbstractTreeViewer; import org.eclipse.jface.viewers.ListViewer; import org.eclipse.jface.viewers.StructuredViewer; import org.eclipse.jface.viewers.TableViewer; import org.eclipse.jface.viewers.TreeViewer; import org.eclipse.jface.viewers.Viewer; import org.eclipse.swt.widgets.Display; /** * This class calls optimized refresh APIs for all the standard Viewer subclasses. */ public class NotifyChangedToViewerRefresh { public static void handleNotifyChanged(final Viewer viewer, final Object object, final int eventType, final Object feature, final Object oldValue, final Object newValue, final int index) { if (viewer.getControl() == null || viewer.getControl().isDisposed()) return; Display d = viewer.getControl().getDisplay(); if (d != Display.getCurrent()) { d.asyncExec(new Runnable() { public void run() { if (viewer.getControl() != null && !viewer.getControl().isDisposed()) { new NotifyChangedToViewerRefresh().refresh(viewer, object, eventType, feature, oldValue, newValue, index); } } }); } else { new NotifyChangedToViewerRefresh().refresh(viewer, object, eventType, feature, oldValue, newValue, index); } } @SuppressWarnings("deprecation") public void refresh(Viewer viewer, Object object, int eventType, Object feature, Object oldValue, Object newValue, int index) { if (viewer instanceof TreeViewer) { refreshTreeViewer((TreeViewer) viewer, object, eventType, feature, oldValue, newValue, index); } else if (viewer instanceof org.eclipse.jface.viewers.TableTreeViewer) { refreshTableTreeViewer((org.eclipse.jface.viewers.TableTreeViewer) viewer, object, eventType, feature, oldValue, newValue, index); } else if (viewer instanceof TableViewer) { refreshTableViewer((TableViewer) viewer, object, eventType, feature, oldValue, newValue, index); } else if (viewer instanceof ListViewer) { refreshListViewer((ListViewer) viewer, object, eventType, feature, oldValue, newValue, index); } else { refreshViewer(viewer, object, eventType, feature, oldValue, newValue, index); } } public void refreshTreeViewer(TreeViewer viewer, Object object, int eventType, Object feature, Object oldValue, Object newValue, int index) { switch (eventType) { case Notification.ADD: case Notification.ADD_MANY: case Notification.REMOVE: case Notification.REMOVE_MANY: case Notification.MOVE: case Notification.UNSET: case Notification.SET: default: { refreshAbstractTreeViewer(viewer, object, eventType, feature, oldValue, newValue, index); break; } } } @Deprecated public void refreshTableTreeViewer(org.eclipse.jface.viewers.TableTreeViewer viewer, Object object, int eventType, Object feature, Object oldValue, Object newValue, int index) { switch (eventType) { case Notification.ADD: case Notification.ADD_MANY: case Notification.REMOVE: case Notification.REMOVE_MANY: case Notification.MOVE: case Notification.UNSET: case Notification.SET: default: { refreshAbstractTreeViewer(viewer, object, eventType, feature, oldValue, newValue, index); break; } } } public void refreshListViewer(ListViewer viewer, Object object, int eventType, Object feature, Object oldValue, Object newValue, int index) { switch (eventType) { case Notification.ADD: { viewer.add(newValue); break; } case Notification.ADD_MANY: { viewer.add(((Collection<?>) newValue).toArray()); break; } case Notification.REMOVE: { viewer.remove(oldValue); break; } case Notification.REMOVE_MANY: { viewer.remove(((Collection<?>) oldValue).toArray()); break; } case Notification.MOVE: { viewer.refresh(); // ??? } case Notification.UNSET: case Notification.SET: default: { refreshStructuredViewer(viewer, object, eventType, feature, oldValue, newValue, index); break; } } } public void refreshTableViewer(TableViewer viewer, Object object, int eventType, Object feature, Object oldValue, Object newValue, int index) { switch (eventType) { case Notification.ADD: { viewer.insert(newValue, index); break; } case Notification.ADD_MANY: { if (index == -1) { viewer.add(((Collection<?>) newValue).toArray()); } else { for (Object value : (Collection<?>) newValue) { viewer.insert(value, index++); } } break; } case Notification.REMOVE: { viewer.remove(oldValue); break; } case Notification.REMOVE_MANY: { viewer.remove(((Collection<?>) oldValue).toArray()); break; } case Notification.MOVE: case Notification.UNSET: case Notification.SET: default: { refreshStructuredViewer(viewer, object, eventType, feature, oldValue, newValue, index); break; } } } public void refreshAbstractTreeViewer(AbstractTreeViewer viewer, Object object, int eventType, Object feature, Object oldValue, Object newValue, int index) { switch (eventType) { case Notification.ADD: { if (newValue == null) { viewer.refresh(object); } else { viewer.add(object, newValue); } break; } case Notification.ADD_MANY: { viewer.add(object, ((Collection<?>) newValue).toArray()); break; } case Notification.REMOVE: { if (oldValue == null) { viewer.refresh(object); } else { viewer.remove(oldValue); } break; } case Notification.REMOVE_MANY: { viewer.remove(((Collection<?>) oldValue).toArray()); break; } case Notification.MOVE: case Notification.UNSET: case Notification.SET: default: { refreshStructuredViewer(viewer, object, eventType, feature, oldValue, newValue, index); break; } } } public void refreshStructuredViewer(StructuredViewer viewer, Object object, int eventType, Object feature, Object oldValue, Object newValue, int index) { switch (eventType) { case Notification.ADD: case Notification.ADD_MANY: case Notification.REMOVE: case Notification.REMOVE_MANY: case Notification.MOVE: { viewer.refresh(object); break; } case Notification.UNSET: case Notification.SET: { if (feature instanceof EReference) { viewer.refresh(object); } else { viewer.update(object, feature instanceof ENamedElement ? new String[] { ((ENamedElement) feature).getName() } : null); } break; } // case Notification.TOUCH: default: { refreshViewer(viewer, object, eventType, feature, oldValue, newValue, index); break; } } } public void refreshViewer(Viewer viewer, Object object, int eventType, Object feature, Object oldValue, Object newValue, int index) { switch (eventType) { case Notification.RESOLVE: { // We ignore non-changes for now. // break; } case Notification.ADD: case Notification.ADD_MANY: case Notification.REMOVE: case Notification.REMOVE_MANY: case Notification.MOVE: case Notification.UNSET: case Notification.SET: default: { viewer.refresh(); break; } } } }