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/*******************************************************************************
* Copyright (c) 2000, 2004 IBM Corporation and others.
* All rights reserved. This program and the accompanying materials
* are made available under the terms of the Common Public License v1.0
* which accompanies this distribution, and is available at
* http://www.eclipse.org/legal/cpl-v10.html
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.debug.internal.ui.views.launch;
import org.eclipse.core.runtime.IProgressMonitor;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.core.runtime.Status;
import org.eclipse.debug.internal.ui.views.DebugUIViewsMessages;
import org.eclipse.jface.viewers.ITreeContentProvider;
import org.eclipse.ui.IWorkbenchPartSite;
import org.eclipse.ui.internal.progress.PendingUpdateAdapter;
import org.eclipse.ui.progress.DeferredTreeContentManager;
import org.eclipse.ui.progress.IDeferredWorkbenchAdapter;
import org.eclipse.ui.progress.IElementCollector;
import org.eclipse.ui.progress.WorkbenchJob;
/**
* A deferred content manager that merges content into a tree rather then replacing
* it children with a "pending" node, and then the real children. This avoids
* collapsing the viewer when a refresh is performed. This implementation is
* currently tied to the LaunchViewer.
*
* @since 3.1
*/
public class IncrementalDeferredTreeContentManager extends DeferredTreeContentManager {
private LaunchViewer fViewer;
/**
* Contructs a new content manager.
*
* @param provider content provider
* @param viewer viewer
* @param site part site
*/
public IncrementalDeferredTreeContentManager(ITreeContentProvider provider, LaunchViewer viewer, IWorkbenchPartSite site) {
super(provider, viewer, site);
fViewer = viewer;
}
/**
* Create the element collector for the receiver.
*@param parent
* The parent object being filled in,
* @param placeholder
* The adapter that will be used to indicate that results are
* pending.
* @return IElementCollector
*/
protected IElementCollector createElementCollector(final Object parent, final PendingUpdateAdapter placeholder) {
return new IElementCollector() {
// number of children added to the tree
int offset = 0;
/*
* (non-Javadoc)
* @see org.eclipse.jface.progress.IElementCollector#add(java.lang.Object, org.eclipse.core.runtime.IProgressMonitor)
*/
public void add(Object element, IProgressMonitor monitor) {
add(new Object[] { element }, monitor);
}
/*
* (non-Javadoc)
* @see org.eclipse.jface.progress.IElementCollector#add(java.lang.Object[], org.eclipse.core.runtime.IProgressMonitor)
*/
public void add(Object[] elements, IProgressMonitor monitor) {
Object[] filtered = fViewer.filter(elements);
replaceChildren(parent, filtered, offset, monitor);
offset = offset + filtered.length;
}
/*
* (non-Javadoc)
*
* @see org.eclipse.jface.progress.IElementCollector#done()
*/
public void done() {
prune(parent, offset);
}
};
}
/**
* Returns the child elements of the given element, or in the case of a
* deferred element, returns a placeholder. If a deferred element is used, a
* job is created to fetch the children in the background.
*
* @param parent
* The parent object.
* @return Object[] or <code>null</code> if parent is not an instance of
* IDeferredWorkbenchAdapter.
*/
public Object[] getChildren(final Object parent) {
IDeferredWorkbenchAdapter element = getAdapter(parent);
if (element == null)
return null;
Object[] currentChildren = fViewer.getCurrentChildren(parent);
PendingUpdateAdapter placeholder = null;
if (currentChildren == null || currentChildren.length == 0) {
placeholder = new PendingUpdateAdapter();
}
startFetchingDeferredChildren(parent, element, placeholder);
if (placeholder == null) {
return currentChildren;
}
return new Object[] { placeholder };
}
/**
* Create a UIJob to replace the children of the parent in the tree viewer.
*
* @param parent
* @param children
* @param offset
* @param monitor
*/
protected void replaceChildren(final Object parent, final Object[] children, final int offset, IProgressMonitor monitor) {
WorkbenchJob updateJob = new WorkbenchJob(DebugUIViewsMessages.getString("IncrementalDeferredTreeContentManager.0")) { //$NON-NLS-1$
/*
* (non-Javadoc)
*
* @see org.eclipse.ui.progress.UIJob#runInUIThread(org.eclipse.core.runtime.IProgressMonitor)
*/
public IStatus runInUIThread(IProgressMonitor updateMonitor) {
//Cancel the job if the tree viewer got closed
if (fViewer.getControl().isDisposed())
return Status.CANCEL_STATUS;
//Prevent extra redraws on deletion and addition
fViewer.getControl().setRedraw(false);
fViewer.replace(parent, children, offset);
fViewer.getControl().setRedraw(true);
return Status.OK_STATUS;
}
};
updateJob.setSystem(true);
updateJob.schedule();
}
/**
* Create a UIJob to replace the children of the parent in the tree viewer.
*
* @param parent
* @param children
* @param offset
* @param monitor
*/
protected void prune(final Object parent, final int offset) {
WorkbenchJob updateJob = new WorkbenchJob(DebugUIViewsMessages.getString("IncrementalDeferredTreeContentManager.1")) { //$NON-NLS-1$
/*
* (non-Javadoc)
*
* @see org.eclipse.ui.progress.UIJob#runInUIThread(org.eclipse.core.runtime.IProgressMonitor)
*/
public IStatus runInUIThread(IProgressMonitor updateMonitor) {
//Cancel the job if the tree viewer got closed
if (fViewer.getControl().isDisposed())
return Status.CANCEL_STATUS;
//Prevent extra redraws on deletion and addition
fViewer.getControl().setRedraw(false);
fViewer.prune(parent, offset);
fViewer.getControl().setRedraw(true);
return Status.OK_STATUS;
}
};
updateJob.setSystem(true);
updateJob.schedule();
}
/* (non-Javadoc)
* @see org.eclipse.ui.progress.DeferredTreeContentManager#runClearPlaceholderJob(org.eclipse.ui.internal.progress.PendingUpdateAdapter)
*/
protected void runClearPlaceholderJob(PendingUpdateAdapter placeholder) {
if (placeholder != null) {
super.runClearPlaceholderJob(placeholder);
}
}
}
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