core/org.eclipse.stem.ui.grapheditor/src/org/eclipse/stem/ui/grapheditor/ComboSelectionListenerValue.java

package org.eclipse.stem.ui.grapheditor;

import java.util.List;

import org.eclipse.swt.events.SelectionEvent;
import org.eclipse.swt.events.SelectionListener;
import org.eclipse.swt.widgets.Combo;
import org.eclipse.swt.widgets.Label;
import org.eclipse.zest.core.widgets.Graph;
import org.eclipse.zest.core.widgets.GraphItem;
import org.eclipse.zest.core.widgets.GraphNode;


// when selection of label contents changes
public class ComboSelectionListenerValue implements SelectionListener {


	NodeData nodeData;
	Graph zestGraph;
	Label connectedLabel;
	Combo connectedCombo;
	int selectedValue = -1;
	
	ComboSelectionListenerValue(Graph zestGraph, Combo connectedCombo, Label connectedLabel)
	{
		
		this.zestGraph = zestGraph;
		this.connectedCombo = connectedCombo;
		this.connectedLabel = connectedLabel;
		
	}
	
	
	public void widgetDefaultSelected(final SelectionEvent e) {}
	

	public void widgetSelected(org.eclipse.swt.events.SelectionEvent e) {				
		Combo valueCombo = (Combo) e.widget;	
		//no idea but seems to be necessary in some cases
		if (valueCombo.getSelectionIndex() != -1)
		{ 
			this.selectedValue = valueCombo.getSelectionIndex(); 
		}
		int selectedType = connectedCombo.getSelectionIndex(); 
		
		List<GraphItem> selectedItems = zestGraph.getSelection();
		if (selectedItems.size() == 1)
		{
			if (selectedItems.get(0) instanceof GraphNode)
			{
				GraphNode selectedNode = (GraphNode) selectedItems.get(0);
				NodeData nodeData = (NodeData) selectedNode.getData();
				this.nodeData = nodeData;
				
			}			
		}
		
		if  (this.nodeData == null)
			return;
		
		
		if (selectedValue >= 0)
		{
			/*String oldValueString = valueCombo.getItem(selectedValue);						
			String newValueString = valueCombo.getText();
			
			EList<org.eclipse.stem.core.graph.NodeLabel> nodeLabels = nodeData.getNodeLabels();
			org.eclipse.stem.core.graph.NodeLabel nodeLabel = nodeLabels.get(selectedType);*/
			List<Integer> labelTypes = nodeData.getNodeLabelTypes();
				
			switch(labelTypes.get(selectedType))
			{
				case GraphDefs.AREA_LABEL:  
						connectedLabel.setText("Value (Area km^2): ");						
						break;
				
				case GraphDefs.POPULATION_LABEL: 	
					
										
					//order defined in other listener
					if (this.selectedValue == 0) // population name
					{
						connectedLabel.setText("Value (Population Name): ");	
					}
					if (this.selectedValue == 1) // pop size
					{
						connectedLabel.setText("Value (Population Size): ");	
					}
					if (this.selectedValue == 2) //population area
					{	
						connectedLabel.setText("Value (Population Area): ");	
					}						
					break;
			} //end switch

		} // selected value index in combo >= 0
						
	} // widget selected
} //end combo listener for Node Label Values