ui/src/main/java/net/sf/taverna/t2/lang/ui/treetable/TreeTableModelAdapter.java

/*
 * @(#)TreeTableModelAdapter.java	1.2 98/10/27
 *
 * Copyright 1997, 1998 by Sun Microsystems, Inc.,
 * 901 San Antonio Road, Palo Alto, California, 94303, U.S.A.
 * All rights reserved.
 *
 * This software is the confidential and proprietary information
 * of Sun Microsystems, Inc. ("Confidential Information").  You
 * shall not disclose such Confidential Information and shall use
 * it only in accordance with the terms of the license agreement
 * you entered into with Sun.
 */
package net.sf.taverna.t2.lang.ui.treetable;

import javax.swing.JTree;
import javax.swing.SwingUtilities;
import javax.swing.event.TreeExpansionEvent;
import javax.swing.event.TreeExpansionListener;
import javax.swing.event.TreeModelEvent;
import javax.swing.event.TreeModelListener;
import javax.swing.table.AbstractTableModel;
import javax.swing.tree.TreePath;

/**
 * This is a wrapper class takes a TreeTableModel and implements 
 * the table model interface. The implementation is trivial, with 
 * all of the event dispatching support provided by the superclass: 
 * the AbstractTableModel. 
 *
 * @version 1.2 10/27/98
 *
 * @author Philip Milne
 * @author Scott Violet
 */
@SuppressWarnings("serial")
public class TreeTableModelAdapter extends AbstractTableModel
{
    JTree tree;
    TreeTableModel treeTableModel;

    public TreeTableModelAdapter(TreeTableModel treeTableModel, JTree tree) {
        this.tree = tree;
        this.treeTableModel = treeTableModel;

	tree.addTreeExpansionListener(new TreeExpansionListener() {
	    // Don't use fireTableRowsInserted() here; the selection model
	    // would get updated twice. 
	    public void treeExpanded(TreeExpansionEvent event) {  
	      fireTableDataChanged(); 
	    }
            public void treeCollapsed(TreeExpansionEvent event) {  
	      fireTableDataChanged(); 
	    }
	});

	// Install a TreeModelListener that can update the table when
	// tree changes. We use delayedFireTableDataChanged as we can
	// not be guaranteed the tree will have finished processing
	// the event before us.
	treeTableModel.addTreeModelListener(new TreeModelListener() {
	    public void treeNodesChanged(TreeModelEvent e) {
		delayedFireTableDataChanged();
	    }

	    public void treeNodesInserted(TreeModelEvent e) {
		delayedFireTableDataChanged();
	    }

	    public void treeNodesRemoved(TreeModelEvent e) {
		delayedFireTableDataChanged();
	    }

	    public void treeStructureChanged(TreeModelEvent e) {
		delayedFireTableDataChanged();
	    }
	});
    }

    // Wrappers, implementing TableModel interface. 

    public int getColumnCount() {
	return treeTableModel.getColumnCount();
    }

    public String getColumnName(int column) {
	return treeTableModel.getColumnName(column);
    }

    public Class getColumnClass(int column) {
	return treeTableModel.getColumnClass(column);
    }

    public int getRowCount() {
	return tree.getRowCount();
    }

    protected Object nodeForRow(int row) {
    	TreePath treePath = tree.getPathForRow(row);
    	if (treePath == null) {
    		return null;
    	}
    	return treePath.getLastPathComponent();         
    }

    public Object getValueAt(int row, int column) {
    	return treeTableModel.getValueAt(nodeForRow(row), column);
    }

    public boolean isCellEditable(int row, int column) {
         return treeTableModel.isCellEditable(nodeForRow(row), column); 
    }

    public void setValueAt(Object value, int row, int column) {
	treeTableModel.setValueAt(value, nodeForRow(row), column);
    }

    /**
     * Invokes fireTableDataChanged after all the pending events have been
     * processed. SwingUtilities.invokeLater is used to handle this.
     */
    protected void delayedFireTableDataChanged() {
	SwingUtilities.invokeLater(new Runnable() {
	    public void run() {
	    TreePath[] selected = tree.getSelectionPaths();
		fireTableDataChanged();
		tree.setSelectionPaths(selected);
	    }
	});
    }
}