/*******************************************************************************
 * 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.graphlisteners;

import org.eclipse.linuxtools.internal.callgraph.StapGraph;

public class AutoScrollHelper {

	public static void scrollUp(StapGraph graph) {

		if (graph.getDrawMode() == StapGraph.CONSTANT_DRAWMODE_LEVEL) {
			int parent = graph.getNodeData(graph.getRootVisibleNodeNumber()).parent;
			if (graph.isCollapseMode()) {
				parent = graph.getNodeData(graph.getRootVisibleNodeNumber()).collapsedParent;
			}

			if (graph.getNodeData(parent) != null && graph.getNodeData(parent).levelOfRecursion > 0 ) {
				int animMode = graph.getAnimationMode();
				graph.draw(graph.getDrawMode(), StapGraph.CONSTANT_ANIMATION_FASTEST, parent);
				graph.setAnimationMode(animMode);
			}
		} else if (graph.getDrawMode() == StapGraph.CONSTANT_DRAWMODE_TREE) {
			graph.shrinkTree();
		}
	}

	public static void scrollDown(StapGraph graph) {
		if (graph.getDrawMode() == StapGraph.CONSTANT_DRAWMODE_LEVEL) {
			if (graph.getTopLevel() + graph.levelBuffer <
					graph.getLowestLevelOfNodesAdded()) {
				int newLevel = graph.getTopLevel() + 1;
				if (graph.levels.get(newLevel).get(0) == null) {
					return;
				}

				graph.setTopLevelTo(newLevel);
				int animMode = graph.getAnimationMode();
				graph.setAnimationMode(StapGraph.CONSTANT_ANIMATION_FASTEST);
				graph.draw(graph.getDrawMode(), StapGraph.CONSTANT_ANIMATION_FASTEST,
						graph.levels.get(newLevel).get(0));
				graph.setAnimationMode(animMode);
			}
		} else if (graph.getDrawMode() == StapGraph.CONSTANT_DRAWMODE_TREE) {
			graph.extendTree();
		}

	}


}
