/*******************************************************************************
* Copyright (c) 2009 Red Hat, Inc.
* 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:
* Red Hat - initial API and implementation
*******************************************************************************/
package org.eclipse.linuxtools.internal.callgraph.treeviewer;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import org.eclipse.jface.viewers.ITreeViewerListener;
import org.eclipse.jface.viewers.TreeExpansionEvent;
import org.eclipse.linuxtools.internal.callgraph.StapData;
import org.eclipse.swt.widgets.ScrollBar;
public class StapTreeListener implements ITreeViewerListener{
private static final int INCREMENT = 15;
private int highestLevelOfExpansion;
private ScrollBar scrollbar;
private HashMap<Integer, List<Integer>> highestLevelNodes;
//Level of recursion, list of nodes at that level currently displayed in tree
/**
* Autoscroll the horizontal scrollbar when there is a collapse event.
*
*/
@Override
public void treeCollapsed(TreeExpansionEvent event) {
StapData data = (StapData) event.getElement();
if (highestLevelNodes.get(highestLevelOfExpansion) != null
&& highestLevelNodes.get(highestLevelOfExpansion).remove((Integer) data.id)) {
scrollbar.setSelection(scrollbar.getSelection() - INCREMENT);
highestLevelOfExpansion--;
}
}
/**
* Autoscroll the horizontal scrollbar when there is an expand event.
*
*/
@Override
public void treeExpanded(TreeExpansionEvent event) {
StapData d = ((StapData) event.getElement());
if (d.levelOfRecursion > highestLevelOfExpansion) {
scrollbar.setSelection(scrollbar.getSelection() + INCREMENT);
highestLevelOfExpansion = ((StapData) event.getElement()).levelOfRecursion;
}
int lvl = d.levelOfRecursion;
if (highestLevelNodes.get(lvl) == null) {
highestLevelNodes.put(lvl, new ArrayList<Integer>());
}
highestLevelNodes.get(lvl).add(d.id);
}
public StapTreeListener(ScrollBar bar) {
this.highestLevelOfExpansion=0;
this.scrollbar = bar;
highestLevelNodes = new HashMap<>();
}
}