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/*******************************************************************************
* Copyright (c) 2012 Wind River Systems, Inc. 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:
* Wind River Systems - initial API and implementation
*******************************************************************************/
package org.eclipse.tcf.te.tcf.processes.ui.navigator.events;
import org.eclipse.core.runtime.Assert;
import org.eclipse.core.runtime.IStatus;
import org.eclipse.jface.viewers.ITreeViewerListener;
import org.eclipse.jface.viewers.TreeExpansionEvent;
import org.eclipse.tcf.protocol.Protocol;
import org.eclipse.tcf.te.runtime.callback.Callback;
import org.eclipse.tcf.te.runtime.events.ChangeEvent;
import org.eclipse.tcf.te.runtime.events.EventManager;
import org.eclipse.tcf.te.runtime.model.PendingOperationModelNode;
import org.eclipse.tcf.te.runtime.model.interfaces.IContainerModelNode;
import org.eclipse.tcf.te.runtime.model.interfaces.contexts.IAsyncRefreshableCtx;
import org.eclipse.tcf.te.runtime.model.interfaces.contexts.IAsyncRefreshableCtx.QueryState;
import org.eclipse.tcf.te.runtime.model.interfaces.contexts.IAsyncRefreshableCtx.QueryType;
import org.eclipse.tcf.te.tcf.core.model.interfaces.IModel;
import org.eclipse.tcf.te.tcf.core.model.interfaces.services.IModelRefreshService;
import org.eclipse.tcf.te.tcf.processes.core.model.interfaces.IProcessContextNode;
import org.eclipse.tcf.te.tcf.processes.core.model.nodes.PendingOperationNode;
/**
* Tree listener implementation.
*/
public class TreeViewerListener implements ITreeViewerListener {
/* (non-Javadoc)
* @see org.eclipse.jface.viewers.ITreeViewerListener#treeCollapsed(org.eclipse.jface.viewers.TreeExpansionEvent)
*/
@Override
public void treeCollapsed(TreeExpansionEvent event) {
}
/* (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;
// Get the asynchronous refresh context adapter
final IAsyncRefreshableCtx refreshable = (IAsyncRefreshableCtx)node.getAdapter(IAsyncRefreshableCtx.class);
// Don't do anything if refresh is IN_PROGRESS
if (refreshable != null && refreshable.getQueryState(QueryType.CHILD_LIST).equals(QueryState.IN_PROGRESS)) {
return;
}
// Trigger a refresh of the expanded node to get the children right
if (refreshable != null) {
// 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() {
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);
}
}
}
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