/*******************************************************************************
* Copyright (c) 2006, 2009 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
* Wind River Systems - Fix for viewer state save/restore [188704]
* Pawel Piech (Wind River) - added support for a virtual tree model viewer (Bug 242489)
*******************************************************************************/
package org.eclipse.debug.internal.ui.viewers.model;
import org.eclipse.debug.internal.ui.viewers.model.provisional.IElementContentProvider;
import org.eclipse.debug.internal.ui.viewers.model.provisional.IModelDelta;
import org.eclipse.debug.internal.ui.viewers.model.provisional.IModelDeltaVisitor;
import org.eclipse.debug.internal.ui.viewers.model.provisional.IPresentationContext;
import org.eclipse.debug.internal.ui.viewers.model.provisional.ModelDelta;
import org.eclipse.jface.viewers.TreePath;
import org.eclipse.jface.viewers.TreeSelection;
/**
* Content provider for a virtual tree.
*
* @since 3.3
*/
public class TreeModelContentProvider extends ModelContentProvider implements ITreeModelContentProvider {
/**
* Re-filters any filtered children of the given parent element.
*
* @param path parent element
*/
protected void refilterChildren(TreePath path) {
if (getViewer() != null) {
int[] filteredChildren = getFilteredChildren(path);
if (filteredChildren != null) {
for (int i = 0; i < filteredChildren.length; i++) {
doUpdateElement(path, filteredChildren[i]);
}
}
}
}
protected synchronized void doUpdateChildCount(TreePath path) {
Object element = getElement(path);
IElementContentProvider contentAdapter = ViewerAdapterService.getContentProvider(element);
if (contentAdapter != null) {
ChildrenCountUpdate request = new ChildrenCountUpdate(this, getViewer().getInput(), path, element, contentAdapter, getPresentationContext());
schedule(request);
}
}
protected synchronized void doUpdateElement(TreePath parentPath, int modelIndex) {
Object parent = getElement(parentPath);
IElementContentProvider contentAdapter = ViewerAdapterService.getContentProvider(parent);
if (contentAdapter != null) {
ChildrenUpdate request = new ChildrenUpdate(this, getViewer().getInput(), parentPath, parent, modelIndex, contentAdapter, getPresentationContext());
schedule(request);
}
}
protected synchronized void doUpdateHasChildren(TreePath path) {
Object element = getElement(path);
IElementContentProvider contentAdapter = ViewerAdapterService.getContentProvider(element);
if (contentAdapter != null) {
HasChildrenUpdate request = new HasChildrenUpdate(this, getViewer().getInput(), path, element, contentAdapter, getPresentationContext());
schedule(request);
}
}
/* (non-Javadoc)
* @see org.eclipse.debug.internal.ui.viewers.model.provisional.viewers.ModelContentProvider#getPresentationContext()
*/
protected IPresentationContext getPresentationContext() {
return ((ITreeModelViewer)getViewer()).getPresentationContext();
}
/* (non-Javadoc)
* @see org.eclipse.debug.internal.ui.viewers.model.provisional.viewers.ModelContentProvider#handleAdd(org.eclipse.debug.internal.ui.viewers.provisional.IModelDelta)
*/
protected void handleAdd(IModelDelta delta) {
IModelDelta parentDelta = delta.getParentDelta();
TreePath parentPath = getViewerTreePath(parentDelta);
Object element = delta.getElement();
int count = parentDelta.getChildCount();
if (count > 0) {
setModelChildCount(parentPath, count);
int viewCount = modelToViewChildCount(parentPath, count);
int modelIndex = count - 1;
int viewIndex = viewCount - 1;
if (shouldFilter(parentPath, element)) {
addFilteredIndex(parentPath, modelIndex, element);
if (DEBUG_CONTENT_PROVIDER && (DEBUG_PRESENTATION_ID == null || DEBUG_PRESENTATION_ID.equals(getPresentationContext().getId()))) {
System.out.println("[filtered] handleAdd(" + delta.getElement() + ")"); //$NON-NLS-1$ //$NON-NLS-2$
}
} else {
if (isFiltered(parentPath, modelIndex)) {
clearFilteredChild(parentPath, modelIndex);
}
if (DEBUG_CONTENT_PROVIDER && (DEBUG_PRESENTATION_ID == null || DEBUG_PRESENTATION_ID.equals(getPresentationContext().getId()))) {
System.out.println("handleAdd(" + delta.getElement() + ") viewIndex: " + viewCount + " modelIndex: " + modelIndex); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
}
getViewer().setChildCount(parentPath, viewCount);
getViewer().replace(parentPath, viewIndex, element);
TreePath childPath = parentPath.createChildPath(element);
updateHasChildren(childPath);
doRestore(childPath, modelIndex, false, false);
}
} else {
if (DEBUG_CONTENT_PROVIDER && (DEBUG_PRESENTATION_ID == null || DEBUG_PRESENTATION_ID.equals(getPresentationContext().getId()))) {
System.out.println("handleAdd(" + delta.getElement() + ")"); //$NON-NLS-1$ //$NON-NLS-2$
}
doUpdateChildCount(getViewerTreePath(delta.getParentDelta()));
}
}
/* (non-Javadoc)
* @see org.eclipse.debug.internal.ui.viewers.model.provisional.viewers.ModelContentProvider#handleContent(org.eclipse.debug.internal.ui.viewers.provisional.IModelDelta)
*/
protected void handleContent(IModelDelta delta) {
if (delta.getParentDelta() == null && delta.getChildCount() == 0) {
// if the delta is for the root, ensure the root still matches viewer input
if (!delta.getElement().equals(getViewer().getInput())) {
return;
}
}
TreePath treePath = getViewerTreePath(delta);
cancelSubtreeUpdates(treePath);
getViewer().refresh(getElement(treePath));
}
/* (non-Javadoc)
* @see org.eclipse.debug.internal.ui.viewers.model.ModelContentProvider#handleCollapse(org.eclipse.debug.internal.ui.viewers.model.provisional.IModelDelta)
*/
protected void handleCollapse(IModelDelta delta) {
TreePath elementPath = getViewerTreePath(delta);
getViewer().setExpandedState(elementPath, false);
}
/* (non-Javadoc)
* @see org.eclipse.debug.internal.ui.viewers.model.provisional.viewers.ModelContentProvider#handleExpand(org.eclipse.debug.internal.ui.viewers.provisional.IModelDelta)
*/
protected void handleExpand(IModelDelta delta) {
// expand each parent, then this node
IModelDelta parentDelta = delta.getParentDelta();
if (parentDelta != null) {
if ((parentDelta.getFlags() & IModelDelta.EXPAND) == 0) {
handleExpand(parentDelta);
}
expand(delta);
} else {
int childCount = delta.getChildCount();
TreePath elementPath = getViewerTreePath(delta);
if (childCount > 0) {
int viewCount = modelToViewChildCount(elementPath, childCount);
if (DEBUG_CONTENT_PROVIDER && (DEBUG_PRESENTATION_ID == null || DEBUG_PRESENTATION_ID.equals(getPresentationContext().getId()))) {
System.out.println("[expand] setChildCount(" + delta.getElement() + ", (model) " + childCount + " (view) " + viewCount); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
}
getViewer().setChildCount(elementPath, viewCount);
}
}
}
protected void expand(IModelDelta delta) {
int childCount = delta.getChildCount();
int modelIndex = delta.getIndex();
ITreeModelContentProviderTarget treeViewer = getViewer();
TreePath elementPath = getViewerTreePath(delta);
if (modelIndex >= 0) {
TreePath parentPath = elementPath.getParentPath();
if (parentPath == null) {
parentPath = TreePath.EMPTY;
}
int viewIndex = modelToViewIndex(parentPath, modelIndex);
if (viewIndex >= 0) {
if (DEBUG_CONTENT_PROVIDER && (DEBUG_PRESENTATION_ID == null || DEBUG_PRESENTATION_ID.equals(getPresentationContext().getId()))) {
System.out.println("[expand] replace(" + delta.getParentDelta().getElement() + ", (model) " + modelIndex + " (view) " + viewIndex + ", " + delta.getElement()); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
}
treeViewer.replace(parentPath, viewIndex, delta.getElement());
} else {
// Element is filtered - if no longer filtered, insert the element
viewIndex = unfilterElement(parentPath, delta.getElement(), modelIndex);
if (viewIndex < 0) {
// insert did not complete
return;
}
}
}
if (childCount > 0) {
int viewCount = modelToViewChildCount(elementPath, childCount);
if (DEBUG_CONTENT_PROVIDER && (DEBUG_PRESENTATION_ID == null || DEBUG_PRESENTATION_ID.equals(getPresentationContext().getId()))) {
System.out.println("[expand] setChildCount(" + delta.getElement() + ", (model) " + childCount + " (view) " + viewCount); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
}
treeViewer.setChildCount(elementPath, viewCount);
if (!treeViewer.getExpandedState(elementPath)) {
treeViewer.expandToLevel(elementPath, 1);
}
}
}
/**
* Inserts the given child element of the specified parent into the tree if the element
* should *no* longer be filtered. Returns the view index of the newly inserted element
* or -1 if not inserted.
*
* @param parentPath viewer tree path to parent element
* @param element element to insert
* @param modelIndex index of the element in the model
* @return
*/
protected int unfilterElement(TreePath parentPath, Object element, int modelIndex) {
// Element is filtered - if no longer filtered, insert the element
if (shouldFilter(parentPath, element)) {
if (DEBUG_CONTENT_PROVIDER && (DEBUG_PRESENTATION_ID == null || DEBUG_PRESENTATION_ID.equals(getPresentationContext().getId()))) {
System.out.println("[unfilter] abort unfilter element: " + element + ", (model) " + modelIndex); //$NON-NLS-1$ //$NON-NLS-2$
}
// still filtered, stop
return -1;
}
// clear the filter an insert the element
clearFilteredChild(parentPath, modelIndex);
int viewIndex = modelToViewIndex(parentPath, modelIndex);
if (viewIndex >= 0) {
if (DEBUG_CONTENT_PROVIDER && (DEBUG_PRESENTATION_ID == null || DEBUG_PRESENTATION_ID.equals(getPresentationContext().getId()))) {
System.out.println("[unfilter] insert(" + parentPath.getLastSegment() + ", (model) " + modelIndex + " (view) " + viewIndex + ", " + element); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
}
getViewer().insert(parentPath, element, viewIndex);
return viewIndex;
} else {
// still filtered - should not happen
return -1;
}
}
/* (non-Javadoc)
* @see org.eclipse.debug.internal.ui.viewers.model.provisional.viewers.ModelContentProvider#handleInsert(org.eclipse.debug.internal.ui.viewers.provisional.IModelDelta)
*/
protected void handleInsert(IModelDelta delta) {
// TODO: filters
getViewer().insert(getViewerTreePath(delta.getParentDelta()), delta.getElement(), delta.getIndex());
}
/* (non-Javadoc)
* @see org.eclipse.debug.internal.ui.viewers.model.provisional.viewers.ModelContentProvider#handleRemove(org.eclipse.debug.internal.ui.viewers.provisional.IModelDelta)
*/
protected void handleRemove(IModelDelta delta) {
if (DEBUG_CONTENT_PROVIDER && (DEBUG_PRESENTATION_ID == null || DEBUG_PRESENTATION_ID.equals(getPresentationContext().getId()))) {
System.out.println("handleRemove(" + delta.getElement() + ")"); //$NON-NLS-1$ //$NON-NLS-2$
}
IModelDelta parentDelta = delta.getParentDelta();
ITreeModelContentProviderTarget treeViewer = getViewer();
TreePath parentPath = getViewerTreePath(parentDelta);
Object element = delta.getElement();
if (removeElementFromFilters(parentPath, element)) {
// element was filtered - done
return;
}
int viewIndex = -1;
int modelIndex = delta.getIndex();
int unmappedIndex = -1;
int itemCount = -1;
if (modelIndex < 0) {
itemCount = treeViewer.getChildCount(parentPath);
if (itemCount == -1) {
clearFilters(parentPath);
}
viewIndex = treeViewer.findElementIndex(parentPath, element);
if (viewIndex >= 0) {
modelIndex = viewToModelIndex(parentPath, viewIndex);
} else {
unmappedIndex = treeViewer.findElementIndex(parentPath, null);
}
} else {
viewIndex = modelToViewIndex(parentPath, modelIndex);
}
if (modelIndex >= 0) {
// found the element
if (DEBUG_CONTENT_PROVIDER && (DEBUG_PRESENTATION_ID == null || DEBUG_PRESENTATION_ID.equals(getPresentationContext().getId()))) {
System.out.println(" - (found) remove(" + parentPath.getLastSegment() + ", viewIndex: " + viewIndex + " modelIndex: " + modelIndex); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
}
rescheduleUpdates(parentPath, modelIndex);
getViewer().remove(parentPath, viewIndex);
removeElementFromFilters(parentPath, modelIndex);
return;
}
if (unmappedIndex >= 0) {
// did not find the element, but found an unmapped item.
// remove the unmapped item in it's place and update filters
if (DEBUG_CONTENT_PROVIDER && (DEBUG_PRESENTATION_ID == null || DEBUG_PRESENTATION_ID.equals(getPresentationContext().getId()))) {
System.out.println(" - (not found) remove(" + parentPath.getLastSegment() + ", viewIndex: " + viewIndex + " modelIndex: " + modelIndex + " unmapped index: " + unmappedIndex); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
}
modelIndex = viewToModelIndex(parentPath, unmappedIndex);
rescheduleUpdates(parentPath, modelIndex);
getViewer().remove(parentPath, unmappedIndex);
removeElementFromFilters(parentPath, modelIndex);
return;
}
int modelCount = parentDelta.getChildCount();
if (itemCount >= 0 && modelCount >= 0) {
if (modelToViewChildCount(parentPath, modelCount) == itemCount) {
// item count matches the parent's child count, don't do anything
return;
}
}
// failing that, refresh the parent to properly update for non-visible/unmapped children
// and update filtered indexes
if (DEBUG_CONTENT_PROVIDER && (DEBUG_PRESENTATION_ID == null || DEBUG_PRESENTATION_ID.equals(getPresentationContext().getId()))) {
System.out.println(" - (not found) remove/refresh(" + delta.getElement()); //$NON-NLS-1$
}
getViewer().remove(getViewerTreePath(delta));
clearFilters(parentPath);
getViewer().refresh(parentDelta.getElement());
}
/* (non-Javadoc)
* @see org.eclipse.debug.internal.ui.viewers.model.provisional.viewers.ModelContentProvider#handleReplace(org.eclipse.debug.internal.ui.viewers.provisional.IModelDelta)
*/
protected void handleReplace(IModelDelta delta) {
TreePath parentPath = getViewerTreePath(delta.getParentDelta());
getViewer().replace(parentPath, delta.getIndex(), delta.getElement());
}
/* (non-Javadoc)
* @see org.eclipse.debug.internal.ui.viewers.model.provisional.viewers.ModelContentProvider#handleSelect(org.eclipse.debug.internal.ui.viewers.provisional.IModelDelta)
*/
protected void handleSelect(IModelDelta delta) {
int modelIndex = delta.getIndex();
ITreeModelContentProviderTarget treeViewer = getViewer();
if (modelIndex >= 0) {
IModelDelta parentDelta = delta.getParentDelta();
TreePath parentPath = getViewerTreePath(parentDelta);
int viewIndex = modelToViewIndex(parentPath, modelIndex);
if (viewIndex >= 0) {
// when viewIndex < 0, the element has been filtered - so we should not try to replace
int modelCount = parentDelta.getChildCount();
if (modelCount > 0) {
int viewCount = modelToViewChildCount(parentPath, modelCount);
if (DEBUG_CONTENT_PROVIDER && (DEBUG_PRESENTATION_ID == null || DEBUG_PRESENTATION_ID.equals(getPresentationContext().getId()))) {
System.out.println("[select] setChildCount(" + parentDelta.getElement() + ", (model) " + parentDelta.getChildCount() + " (view) " + viewCount ); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
}
treeViewer.setChildCount(parentPath, viewCount);
}
if (DEBUG_CONTENT_PROVIDER && (DEBUG_PRESENTATION_ID == null || DEBUG_PRESENTATION_ID.equals(getPresentationContext().getId()))) {
System.out.println("[select] replace(" + parentDelta.getElement() + ", (model) " + modelIndex + " (view) " + viewIndex + ", " + delta.getElement()); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
}
treeViewer.replace(parentPath, viewIndex, delta.getElement());
}
}
treeViewer.setSelection(new TreeSelection(getViewerTreePath(delta)), false, (delta.getFlags() & IModelDelta.FORCE) != 0);
}
/* (non-Javadoc)
* @see org.eclipse.debug.internal.ui.viewers.model.provisional.viewers.ModelContentProvider#handleState(org.eclipse.debug.internal.ui.viewers.provisional.IModelDelta)
*/
protected void handleState(IModelDelta delta) {
getViewer().update(delta.getElement());
}
/* (non-Javadoc)
* @see org.eclipse.debug.internal.ui.viewers.model.ModelContentProvider#handleReveal(org.eclipse.debug.internal.ui.viewers.model.provisional.IModelDelta)
*/
protected void handleReveal(IModelDelta delta) {
IModelDelta parentDelta = delta.getParentDelta();
if (parentDelta != null) {
handleExpand(parentDelta);
reveal(delta);
}
}
protected void reveal(IModelDelta delta) {
int modelIndex = delta.getIndex();
ITreeModelContentProviderTarget treeViewer = getViewer();
TreePath elementPath = getViewerTreePath(delta);
if (modelIndex >= 0) {
TreePath parentPath = elementPath.getParentPath();
if (parentPath == null) {
parentPath = TreePath.EMPTY;
}
int viewIndex = modelToViewIndex(parentPath, modelIndex);
if (viewIndex >= 0) {
if (DEBUG_CONTENT_PROVIDER && (DEBUG_PRESENTATION_ID == null || DEBUG_PRESENTATION_ID.equals(getPresentationContext().getId()))) {
System.out.println("[reveal] replace(" + delta.getParentDelta().getElement() + ", (model) " + modelIndex + " (view) " + viewIndex + ", " + delta.getElement()); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$ //$NON-NLS-4$
}
treeViewer.replace(parentPath, viewIndex, delta.getElement());
} else {
// Element is filtered - insert if filter state changed
viewIndex = unfilterElement(parentPath, delta.getElement(), modelIndex);
if (viewIndex < 0) {
// insert did not complete
return;
}
}
// only move tree based on force flag and selection policy
if ((delta.getFlags() & IModelDelta.FORCE) != 0 ||
treeViewer.overrideSelection(treeViewer.getSelection(), new TreeSelection(elementPath)))
{
treeViewer.reveal(parentPath, viewIndex);
}
}
}
/* (non-Javadoc)
* @see org.eclipse.debug.internal.ui.viewers.model.provisional.viewers.ModelContentProvider#buildViewerState(org.eclipse.debug.internal.ui.viewers.provisional.ModelDelta)
*/
protected void buildViewerState(ModelDelta delta) {
ITreeModelContentProviderTarget viewer = getViewer();
viewer.saveElementState(EMPTY_TREE_PATH, delta);
// Add memento for top item if it is mapped to an element. The reveal memento
// is in its own path to avoid requesting unnecessary data when restoring it.
if (viewer.getInput() != null) {
TreePath topElementPath = viewer.getTopElementPath();
if (topElementPath != null) {
ModelDelta parentDelta = delta;
TreePath parentPath = EMPTY_TREE_PATH;
for (int i = 0; i < topElementPath.getSegmentCount(); i++) {
Object element = topElementPath.getSegment(i);
int index = viewer.findElementIndex(parentPath, element);
ModelDelta childDelta = parentDelta.getChildDelta(element);
if (childDelta == null) {
parentDelta = parentDelta.addNode(element, index, IModelDelta.NO_CHANGE);
} else {
parentDelta = childDelta;
}
parentPath = parentPath.createChildPath(element);
}
parentDelta.setFlags(parentDelta.getFlags() | IModelDelta.REVEAL);
}
}
}
/* (non-Javadoc)
* @see org.eclipse.debug.internal.ui.viewers.model.provisional.viewers.ModelContentProvider#doInitialRestore()
*/
protected void doInitialRestore(ModelDelta delta) {
// Find the reveal delta and mark nodes on its path
// to reveal as elements are updated.
markRevealDelta(delta);
// Restore visible items.
// Note (Pawel Piech): the initial list of items is normally
// empty, so in most cases the code below does not do anything.
// Instead doRestore() is called when various updates complete.
int count = getViewer().getChildCount(TreePath.EMPTY);
for (int i = 0; i < count; i++) {
Object data = getViewer().getChildElement(TreePath.EMPTY, i);
if (data != null) {
doRestore(new TreePath(new Object[]{data}), i, false, false);
}
}
}
/**
* Finds the delta with the reveal flag, then it walks up this
* delta and marks all the parents of it with the reveal flag.
* These flags are then used by the restore logic to restore
* and reveal all the nodes leading up to the element that should
* be ultimately at the top.
* @return The node just under the rootDelta which contains
* the reveal flag. <code>null</code> if no reveal flag was found.
*/
private ModelDelta markRevealDelta(ModelDelta rootDelta) {
final ModelDelta[] revealDelta = new ModelDelta[1];
IModelDeltaVisitor visitor = new IModelDeltaVisitor() {
public boolean visit(IModelDelta delta, int depth) {
if ( (delta.getFlags() & IModelDelta.REVEAL) != 0) {
revealDelta[0] = (ModelDelta)delta;
}
// Keep recursing only if we haven't found our delta yet.
return revealDelta[0] == null;
}
};
rootDelta.accept(visitor);
if (revealDelta[0] != null) {
ModelDelta parentDelta = (ModelDelta)revealDelta[0].getParentDelta();
while(parentDelta.getParentDelta() != null) {
revealDelta[0] = parentDelta;
revealDelta[0].setFlags(revealDelta[0].getFlags() | IModelDelta.REVEAL);
parentDelta = (ModelDelta)parentDelta.getParentDelta();
}
}
return revealDelta[0];
}
/* (non-Javadoc)
* @see org.eclipse.jface.viewers.ILazyTreePathContentProvider#getParents(java.lang.Object)
*/
public TreePath[] getParents(Object element) {
return null;
}
/* (non-Javadoc)
* @see org.eclipse.jface.viewers.ILazyTreePathContentProvider#updateChildCount(org.eclipse.jface.viewers.TreePath, int)
*/
public synchronized void updateChildCount(TreePath treePath, int currentChildCount) {
if (DEBUG_CONTENT_PROVIDER && (DEBUG_PRESENTATION_ID == null || DEBUG_PRESENTATION_ID.equals(getPresentationContext().getId()))) {
System.out.println("updateChildCount(" + getElement(treePath) + ", " + currentChildCount + ")"); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
}
refilterChildren(treePath);
//re-filter children when asked to update the child count for an element (i.e.
// when refreshing, see if filtered children are still filtered)
doUpdateChildCount(treePath);
}
/* (non-Javadoc)
* @see org.eclipse.jface.viewers.ILazyTreePathContentProvider#updateElement(org.eclipse.jface.viewers.TreePath, int)
*/
public synchronized void updateElement(TreePath parentPath, int viewIndex) {
int modelIndex = viewToModelIndex(parentPath, viewIndex);
if (DEBUG_CONTENT_PROVIDER && (DEBUG_PRESENTATION_ID == null || DEBUG_PRESENTATION_ID.equals(getPresentationContext().getId()))) {
System.out.println("updateElement("+ getElement(parentPath) + ", " + viewIndex + ") > modelIndex = " + modelIndex); //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
}
doUpdateElement(parentPath, modelIndex);
}
/* (non-Javadoc)
* @see org.eclipse.jface.viewers.ILazyTreePathContentProvider#updateHasChildren(org.eclipse.jface.viewers.TreePath)
*/
public synchronized void updateHasChildren(TreePath path) {
if (DEBUG_CONTENT_PROVIDER && (DEBUG_PRESENTATION_ID == null || DEBUG_PRESENTATION_ID.equals(getPresentationContext().getId()))) {
System.out.println("updateHasChildren(" + getElement(path)); //$NON-NLS-1$
}
doUpdateHasChildren(path);
}
/**
* @param delta
*/
void doRestore(ModelDelta delta, boolean knowsHasChildren, boolean knowsChildCount) {
TreePath treePath = getViewerTreePath(delta);
ITreeModelContentProviderTarget viewer = getViewer();
// Attempt to expand the node only if the children are known.
if (knowsHasChildren && (delta.getFlags() & IModelDelta.EXPAND) != 0) {
viewer.expandToLevel(treePath, 1);
delta.setFlags(delta.getFlags() & ~IModelDelta.EXPAND);
}
if ((delta.getFlags() & IModelDelta.SELECT) != 0) {
viewer.setSelection(new TreeSelection(treePath), false, false);
delta.setFlags(delta.getFlags() & ~IModelDelta.SELECT);
}
if ((delta.getFlags() & IModelDelta.REVEAL) != 0) {
delta.setFlags(delta.getFlags() & ~IModelDelta.REVEAL);
// Look for the reveal flag in the child deltas. If
// A child delta has the reveal flag, do not set the
// top element yet.
boolean setTopItem = true;
IModelDelta[] childDeltas = delta.getChildDeltas();
for (int i = 0; i < childDeltas.length; i++) {
IModelDelta childDelta = childDeltas[i];
int modelIndex = childDelta.getIndex();
if (modelIndex >= 0 && (childDelta.getFlags() & IModelDelta.REVEAL) != 0) {
setTopItem = false;
}
}
if (setTopItem) {
TreePath parentPath = treePath.getParentPath();
int index = viewer.findElementIndex(parentPath, treePath.getLastSegment());
if (index >= 0) {
viewer.reveal(parentPath, index);
}
}
}
// If we know the child count of the element, look for the reveal
// flag in the child deltas. For the children with reveal flag start
// a new update.
// If the child delta's index is out of range, strip the reveal flag
// since it is no longer applicable.
if (knowsChildCount) {
int childCount = viewer.getChildCount(treePath);
if (childCount >= 0) {
ModelDelta[] childDeltas = (ModelDelta[])delta.getChildDeltas();
for (int i = 0; i < childDeltas.length; i++) {
ModelDelta childDelta = childDeltas[i];
int modelIndex = childDelta.getIndex();
if (modelIndex >= 0 && (childDelta.getFlags() & IModelDelta.REVEAL) != 0) {
if (modelIndex < childCount) {
doUpdateElement(treePath, modelIndex);
} else {
childDelta.setFlags(childDelta.getFlags() & ~IModelDelta.REVEAL);
}
}
}
}
}
checkIfRestoreComplete();
}
}
