/**
* Handles the expansionsion of an element in a tree viewer
*
* @param event
*/
public void treeExpanded(TreeExpansionEvent event) {
Object item = event.getElement();
// First see if the children need to be given their checked state at all. If they've
// already been realized then this won't be necessary
if (!fExpandedTreeNodes.contains(item)) {
fExpandedTreeNodes.add(item);
checkNewTreeElements(getTreeChildren(item));
}
}
/* (non-Javadoc)
* @see org.eclipse.jface.viewers.ITreeViewerListener#treeCollapsed(org.eclipse.jface.viewers.TreeExpansionEvent)
*/
public void treeCollapsed(final TreeExpansionEvent event) {
Object element = event.getElement();
if ((element instanceof IGridContainer) && ((IGridContainer) element).isLazy()) {
IGridContainer container = (IGridContainer) element;
this.progressNodes.remove(container);
container.setDirty();
try {
container.deleteAll();
} catch (ProblemException pExc) {
Activator.logException(pExc);
}
}
}
/* (non-Javadoc)
* @see org.eclipse.jface.viewers.ITreeViewerListener#treeExpanded(org.eclipse.jface.viewers.TreeExpansionEvent)
*/
@Override
public void treeExpanded(TreeExpansionEvent event) {
// Get the expanded element
Object element = event.getElement();
if (element instanceof IProcessContextNode) {
final IProcessContextNode node = (IProcessContextNode) element;
// Flag that tells if the node shall be refreshed
boolean needsRefresh = false;
// Get the asynchronous refresh context adapter
final IAsyncRefreshableCtx refreshable =
(IAsyncRefreshableCtx) node.getAdapter(IAsyncRefreshableCtx.class);
Assert.isNotNull(refreshable);
// The node needs to be refreshed if the child list query is not done
if (refreshable.getQueryState(QueryType.CHILD_LIST).equals(QueryState.PENDING)) {
needsRefresh = true;
} else if (refreshable.getQueryState(QueryType.CHILD_LIST).equals(QueryState.DONE)) {
// Our policy is that the current node and it's level 1 children are always
// fully refreshed. The child list query for the current node is not pending,
// so check the children nodes if they need a refresh
for (final IProcessContextNode candidate : node.getChildren(IProcessContextNode.class)) {
// Get the asynchronous refresh context adapter
final IAsyncRefreshableCtx r =
(IAsyncRefreshableCtx) candidate.getAdapter(IAsyncRefreshableCtx.class);
Assert.isNotNull(r);
// If the child list query state is still pending, set the flag and break out of the loop
if (r.getQueryState(QueryType.CHILD_LIST).equals(QueryState.PENDING)) {
needsRefresh = true;
break;
}
}
}
// If the node needs to be refreshed, refresh it now.
if (needsRefresh) {
// Mark the refresh as in progress
refreshable.setQueryState(QueryType.CHILD_LIST, QueryState.IN_PROGRESS);
// Create a new pending operation node and associate it with the refreshable
PendingOperationModelNode pendingNode = new PendingOperationNode();
pendingNode.setParent(node);
refreshable.setPendingOperationNode(pendingNode);
Runnable runnable =
new Runnable() {
@Override
public void run() {
// Trigger a refresh of the view content.
ChangeEvent ev =
new ChangeEvent(node, IContainerModelNode.NOTIFY_CHANGED, null, null);
EventManager.getInstance().fireEvent(ev);
// Get the parent model of the node
IModel model = node.getParent(IModel.class);
Assert.isNotNull(model);
// Don't send change events while refreshing
final boolean changed = node.setChangeEventsEnabled(false);
// Initiate the refresh
model
.getService(IModelRefreshService.class)
.refresh(
node,
new Callback() {
@Override
protected void internalDone(Object caller, IStatus status) {
// Mark the refresh as done
refreshable.setQueryState(QueryType.CHILD_LIST, QueryState.DONE);
// Reset the pending operation node
refreshable.setPendingOperationNode(null);
// Re-enable the change events if they had been enabled before
if (changed) node.setChangeEventsEnabled(true);
// Trigger a refresh of the view content
ChangeEvent event =
new ChangeEvent(
node, IContainerModelNode.NOTIFY_CHANGED, null, null);
EventManager.getInstance().fireEvent(event);
}
});
}
};
Protocol.invokeLater(runnable);
}
}
}
/*
* (non-Javadoc)
*
* @see org.eclipse.jface.viewers.ITreeViewerListener#treeExpanded(org.eclipse.jface.viewers.TreeExpansionEvent)
*/
public void treeExpanded(TreeExpansionEvent event) {
Object element = event.getElement();
internalExpand(element);
}
/*
* (non-Javadoc)
*
* @see org.eclipse.jface.viewers.ITreeViewerListener#treeCollapsed(org.eclipse.jface.viewers.TreeExpansionEvent)
*/
public void treeCollapsed(TreeExpansionEvent event) {
Object element = event.getElement();
internalCollapse(element);
}
