JTable Cell Color Follow Drag Event

[joeyvitoro]

I asked this before and mistakenly marked it as solved. Turns out I was wrong. The following code makes a simple table. If you drag the first column one spot to the right, the cell color follows the cells. If you move farther than 1 column, though, the color gets messed up. Any ideas? Thanks!

import java.awt.*;

import javax.swing.*;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.TableCellRenderer;


public class Table extends JFrame 
{
	public Table() 
	{
		initComponents();
	}

	private void initComponents() {
		scrollPane1 = new JScrollPane();
		table1 = new JTable();

		Container contentPane = getContentPane();
		contentPane.setLayout(null);

		{
			scrollPane1.setViewportView(table1);
		}
		contentPane.add(scrollPane1);
		scrollPane1.setBounds(new Rectangle(new Point(0, 0), scrollPane1.getPreferredSize()));

		{ 
			Dimension preferredSize = new Dimension();
			for(int i = 0; i < contentPane.getComponentCount(); i++) {
				Rectangle bounds = contentPane.getComponent(i).getBounds();
				preferredSize.width = Math.max(bounds.x + bounds.width, preferredSize.width);
				preferredSize.height = Math.max(bounds.y + bounds.height, preferredSize.height);
			}
			Insets insets = contentPane.getInsets();
			preferredSize.width += insets.right;
			preferredSize.height += insets.bottom;
			contentPane.setMinimumSize(preferredSize);
			contentPane.setPreferredSize(preferredSize);
		}
		pack();
		setLocationRelativeTo(getOwner());
	}

	private JScrollPane scrollPane1;
	private JTable table1;
	
	public static void main(String[] args) 
	{	
		Table myTable = new Table();
		myTable.setVisible(true);

		Object[][] data = new Object[3][4];
		Object[] headers = new Object[4];
		
		data[0][0]="1";
		data[1][0]="1";
		data[2][0]="1";
		data[0][1]="1";
		data[1][1]="2";
		data[2][1]="2";
		data[0][2]="1";
		data[1][2]="2";
		data[2][2]="2";
		data[0][3]="1";
		data[1][3]="2";
		data[2][3]="2";
		
		((DefaultTableModel)myTable.table1.getModel()).setDataVector(data,headers);
		TableCellRenderer renderer = new CustomTableCellRenderer();
		myTable.table1.setDefaultRenderer(Object.class, renderer);
		myTable.table1.repaint();
	}
}

class CustomTableCellRenderer extends DefaultTableCellRenderer 
{	
	public Component getTableCellRendererComponent(JTable table, Object value, boolean isSelected, boolean hasFocus, 
			int row, int column) 
	{
		Component c = super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
		int viewColumn = table.convertColumnIndexToView(column);
		if(row >0 && (!(table.getModel().getValueAt(row, viewColumn).equals(table.getModel().getValueAt(row-1, viewColumn)))))
		{
			c.setBackground(Color.PINK);
		}
		else
		{
			c.setBackground(Color.WHITE);
		}
		return c;
	}
}

[DarrylBurke]

Use the methods that convert between view and model index

db

[joeyvitoro]

How would I use them?

[DarrylBurke]

Cross posted
JTable cell background color move with column (Swing / AWT / SWT / JFace forum at JavaRanch)

db

[joeyvitoro]

I did, to one other site, 36 hours later when I was still stumped. I do appreciate the response you provided, but I'm not sure what it means. If you could provide a bit more explanation I would be very greatful.

[camickr]

Renderers always use the view indexes. The problem with the code is that sometimes you access the model and sometimes you access the view.

// int viewColumn = table.convertColumnIndexToView(column); // this already is the view index
// if(row >0 && (!(table.getModel().getValueAt(row, viewColumn).equals(table.getModel().getValueAt(row-1, viewColumn)))))

// access the data via the table and it will do the view/model conversions for you
if(row >0 && (!(table.getValueAt(row, column).equals(table.getValueAt(row-1, column)))))

[joeyvitoro]

That did it...thank you! I have been stuck on this for weeks.