| /******************************************************************************* |
| * Copyright (c) 2003, 2004 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.ui.navigator.internal.deferred; |
| |
| import java.util.Map; |
| import java.util.WeakHashMap; |
| |
| import org.eclipse.core.runtime.IProgressMonitor; |
| import org.eclipse.core.runtime.IStatus; |
| import org.eclipse.core.runtime.Status; |
| import org.eclipse.core.runtime.jobs.ISchedulingRule; |
| import org.eclipse.jface.viewers.AbstractTreeViewer; |
| import org.eclipse.swt.widgets.Control; |
| import org.eclipse.ui.PlatformUI; |
| import org.eclipse.ui.internal.progress.PendingUpdateAdapter; |
| import org.eclipse.ui.navigator.internal.InstanceSchedulingRule; |
| import org.eclipse.ui.progress.UIJob; |
| |
| |
| /** |
| * Elements of the following class were adapted from (@see |
| * org.eclipse.wst.common.navigator.views.DeferredTreeContentManager) |
| * |
| * @author Michael D. Elder <mdelder@us.ibm.com> |
| */ |
| public class TreeViewerElementCollector implements IPendingElementCollector { |
| |
| private Map instanceRuleCache = null; |
| |
| private AbstractTreeViewer treeViewer = null; |
| |
| public TreeViewerElementCollector(AbstractTreeViewer treeViewer) { |
| this.treeViewer = treeViewer; |
| } |
| |
| public synchronized void collectChildren(Object parent, Object[] children) { |
| getDefaultUIUpdateJob(parent, children).schedule(); |
| } |
| |
| public void done(PendingUpdateAdapter placeHolder) { |
| |
| //Only schedule if there is a workbench |
| if (!placeHolder.isRemoved() && PlatformUI.isWorkbenchRunning()) { |
| getDefaultUIComplete(placeHolder).schedule(); |
| } |
| } |
| |
| protected UIJob getDefaultUIUpdateJob(Object parent, Object[] children) { |
| return new TreeViewerUIUpdateJob(parent, children); |
| } |
| |
| /** |
| * @param placeHolder |
| * the placeHolder which needs to be removed from the TreeViewer |
| * @param monitor |
| * @return the default instance of the UI completion job for immediate scheduling |
| */ |
| protected UIJob getDefaultUIComplete(PendingUpdateAdapter placeHolder) { |
| return new ClearPlaceHolderJob(placeHolder); |
| } |
| |
| /** |
| * @return Returns the treeViewer. |
| */ |
| protected AbstractTreeViewer getTreeViewer() { |
| return treeViewer; |
| } |
| |
| protected Map getWrappedRuleCache() { |
| if (instanceRuleCache == null) |
| instanceRuleCache = new WeakHashMap(); |
| return instanceRuleCache; |
| } |
| |
| protected ISchedulingRule getCachedRule(Object ruleObject) { |
| ISchedulingRule rule = (ISchedulingRule) getWrappedRuleCache().get(ruleObject); |
| if (rule == null) { |
| rule = new InstanceSchedulingRule(ruleObject); |
| getWrappedRuleCache().put(ruleObject, rule); |
| } |
| return rule; |
| } |
| |
| public class TreeViewerUIUpdateJob extends UIJob { |
| |
| protected Object parent = null; |
| |
| protected Object[] children = null; |
| |
| public TreeViewerUIUpdateJob(Object parent, Object[] children) { |
| super("Updating tree"); |
| |
| this.parent = parent; |
| this.children = children; |
| |
| //this.setRule(TreeViewerElementCollector.this.getCachedRule(this.parent)); |
| this.setRule(new InstanceSchedulingRule(treeViewer)); |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see org.eclipse.wst.common.navigator.views.UIJob#runInUIThread(org.eclipse.core.runtime.IProgressMonitor) |
| */ |
| public IStatus runInUIThread(IProgressMonitor updateMonitor) { |
| if (children == null || children.length == 0) |
| return Status.OK_STATUS; |
| |
| synchronized (treeViewer) { |
| //Cancel the job if the tree viewer got closed |
| if (treeViewer.getControl().isDisposed()) |
| return Status.CANCEL_STATUS; |
| |
| //Prevent extra redraws on deletion and addition |
| treeViewer.getControl().setRedraw(false); |
| treeViewer.add(parent, children); |
| treeViewer.getControl().setRedraw(true); |
| } |
| |
| return Status.OK_STATUS; |
| } |
| } |
| |
| public class ClearPlaceHolderJob extends UIJob { |
| |
| private PendingUpdateAdapter placeHolder = null; |
| |
| public ClearPlaceHolderJob(PendingUpdateAdapter placeHolder) { |
| super("Remove placeholder"); |
| setSystem(true); |
| this.placeHolder = placeHolder; |
| |
| //this.setRule(TreeViewerElementCollector.this.getCachedRule(this.parent)); |
| this.setRule(new InstanceSchedulingRule(treeViewer)); |
| |
| } |
| |
| /* |
| * (non-Javadoc) |
| * |
| * @see org.eclipse.wst.common.navigator.views.UIJob#runInUIThread(org.eclipse.core.runtime.IProgressMonitor) |
| */ |
| public IStatus runInUIThread(IProgressMonitor monitor) { |
| synchronized (treeViewer) { |
| if (!placeHolder.isRemoved()) { |
| Control control = treeViewer.getControl(); |
| |
| if (control.isDisposed()) |
| return Status.CANCEL_STATUS; |
| |
| getTreeViewer().remove(placeHolder); |
| placeHolder.setRemoved(true); |
| } |
| return Status.OK_STATUS; |
| } |
| } |
| } |
| } |