Java Development Tools

Hi guys, I am here again!!!! I think a lot of about the problem commented before and fix somethings, but at each time I gotted some "bug problems"...

Just to comment, every time I press a addButton I add a row into my model

model.addRow(...)

and when I press the clearButton I remove all rows from my table. But some times neither all rows are removed and the rows are not add at a logical order, sometimes the rows jump from 0 to 3, and the clear just remove some rows.

I sure it is not a java languange bug, but I really are lost, because I don't find at any place how to understand how tables, models, renderer, editors, and anything else worlks....

Please help. Thanks

Use DefaultTableModel.setRowCount(0);
From my example below you could set the value of the cell to "". Then you could override the isCellEditable() method to return false when the "button cell" contains "".

Here is some example code I've been playing with that may (or may not) give you some ideas:

import java.awt.*;
import java.awt.event.*;
import java.util.*;
import javax.swing.*;
import javax.swing.table.*;

public class TableButton3 extends JFrame
{
    public TableButton3()
    {
        String[] columnNames = {"Date", "String", "Integer", "Decimal", ""};
        Object[][] data =
        {
            {new Date(), "A", new Integer(1), new Double(5.1), "Delete0"},
            {new Date(), "B", new Integer(2), new Double(6.2), "Delete1"},
            {new Date(), "C", new Integer(3), new Double(7.3), "Delete2"},
            {new Date(), "D", new Integer(4), new Double(8.4), "Delete3"}
        };

        DefaultTableModel model = new DefaultTableModel(data, columnNames);
        JTable table = new JTable( model )
        {
            //  Returning the Class of each column will allow different
            //  renderers to be used based on Class
            public Class getColumnClass(int column)
            {
                return getValueAt(0, column).getClass();
            }
        };

        JScrollPane scrollPane = new JScrollPane( table );
        getContentPane().add( scrollPane );

        //  Create button column
        ButtonColumn buttonColumn = new ButtonColumn(table, 4);
    }

    public static void main(String[] args)
    {
        TableButton3 frame = new TableButton3();
        frame.setDefaultCloseOperation( EXIT_ON_CLOSE );
        frame.pack();
        frame.setVisible(true);
    }

    class ButtonColumn extends AbstractCellEditor
        implements TableCellRenderer, TableCellEditor, ActionListener
    {
        JTable table;
        JButton renderButton;
        JButton editButton;
        String text;

        public ButtonColumn(JTable table, int column)
        {
            super();
            this.table = table;
            renderButton = new JButton();

            editButton = new JButton();
            editButton.setFocusPainted( false );
            editButton.addActionListener( this );

            TableColumnModel columnModel = table.getColumnModel();
            columnModel.getColumn(column).setCellRenderer( this );
            columnModel.getColumn(column).setCellEditor( this );
        }

        public Component getTableCellRendererComponent(
            JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column)
        {
            if (hasFocus)
            {
                renderButton.setForeground(table.getForeground());
                renderButton.setBackground(UIManager.getColor("Button.background"));
            }
            else if (isSelected)
            {
                renderButton.setForeground(table.getSelectionForeground());
                 renderButton.setBackground(table.getSelectionBackground());
            }
            else
            {
                renderButton.setForeground(table.getForeground());
                renderButton.setBackground(UIManager.getColor("Button.background"));
            }

            renderButton.setText( (value == null) ? "" : value.toString() );
            return renderButton;
        }

        public Component getTableCellEditorComponent(
            JTable table, Object value, boolean isSelected, int row, int column)
        {
            text = (value == null) ? "" : value.toString();
            editButton.setText( text );
            return editButton;
        }

        public Object getCellEditorValue()
        {
            return text;
        }

        public void actionPerformed(ActionEvent e)
        {
            fireEditingStopped();
            System.out.println( e.getActionCommand() + " : " + table.getSelectedRow());
        }
    }
}

Very thanks, Just to report another interested users, my big mistake was only implements the interfaces editor and renderer and don't extends any abstract model......

So without a default implementation I implement all method by myself and they had bugs.

Thanks.

I want to hide the buttons, so I used setVisible(false);
This doesn't worked out, could anyone help me?

did you try to refresh the JTable or to repaint the scrollpane (if you have any) ?

Message was edited by:
ProZ

I refreshed my scrollpane and it works!
Thanks a lot!

iam facing the same problem you faced regarding the Jbutton in Jtable.


I would like to made the button disappear after the user click on it (or force it do setEnabled(false)......

how did u fixed this ...will be more help full if you replied me .
thanks in advance.

sathish.

Just use:

button.setVisible(false);

to hide your button, then refresh your scroll pane and table and use:

this.repaint();

If it still doesn't work. If your problem is still unsolved, remove the scroll pane and JTable and make some new ones. (not a very good solution, this will slow down your program...)
I hope I helped you out a little bit!

thanks ,. i tried the option and it worked well.

I have some other problem also , for some time i am setting the "button.SetEnabled(false); ", but when the user click on another table row my old button becomes visible automatically. How can I fix this things?!!??. Until i click the another button in that column , the button should be in disable state..how to make this work. ???

and also the action performed is called only once and after that it is not getting called if i use the setEnable(false) for the button .

really i have tried several options ...nothing helped.

hi camickr,

First of all thanks! Your code helps me a lot! :) Clear and fast, as I love its!

Do know that it's an old topic, but I've got a simple question. I'm not a swing expert, so hope this question would not sound stupid...
I pay attention to your code, and here is what I've concluded: (do know that it was a simple example)

you are using two components, since the TableCellRenderer and TableCellEditor are implemented in the same class: an editButton and a renderButton (for each method)

If we're digging into a set of components, such as a JPanel in a cell that contains a lot of labels, buttons and so on, does it mean that we must have, actually, two instances of each component? (one by interface, since our class implements each of it)

If my preceding assertion is true, what do you think of this?

columnModel.getColumn(column).setCellRenderer( this );
columnModel.getColumn(column).setCellEditor( this );

// maybe this could do the trick (of course outside the ButtonColumn class
columnModel.getColumn(column).setCellRenderer( new  ButtonColumn());
columnModel.getColumn(column).setCellEditor( new ButtonColumn() );

Have a good day!

Mathieu.

This solution works beautifully - I only have one question:

I've modified some of my cells to support multi-line editing (as seen here: http://www.javaspecialists.co.za/archive/newsletter.do?issue=106&locale=en_US)

This now causes my button cells to expand to the full height of the row. I've tried setting the maximum size on the buttons, but that has no effect - it seems what the JTable does is take a snapshot of the renderer and expand the image to fill the cell, so setting the button size has no effect.

Anyone have any thoughts on how I can restrict the button height? If I happen to have a row with several lines, I don't want the button being any bigger than it thinks it should be (e.g., the button should only be one line).

All components use a renderers are set to the size of the cell. So you could try using a panel as the renderer. Then add your button to the panel. That was the panel gets resized to the size of the cell and the button should stay the correct size.

Perfect! I wrapped both the renderButton and editButton in a JPanel and returned those for the render/edit components instead, and I get a button in the cell that's the size I want.

Thanks again!!

I'm sorry but i can't seem to work this issue out.
I'll try to post some code without going over the top with unnecessary details like row height etc:

MAIN(the main class is called ProvaRendererCells and extends JFRAME):

	
public static void main(String[] args) {    	
                ProvaRendererCells frame = new ProvaRendererCells();;
    	frame.setDefaultCloseOperation( EXIT_ON_CLOSE );
    	frame.pack();
    	frame.setVisible(true);
}

constructor

  	
public ProvaRendererCells() {
    	super("JTableButton Demo");
	DefaultTableModel tableModel = makeTableModel();
	JTable table = new JTable(tableModel);
    	table.setDefaultRenderer(JButton.class, myRenderer);
  	JScrollPane scrollPane = new JScrollPane(table);
                setContentPane(scrollPane);
  }

the TableModel

	
private DefaultTableModel makeTableModel(){
		Vector rows = new Vector();
		Vector row1 = new Vector();
		Vector columns = new Vector();
		columns.addElement("");
		columns.addElement("");
		JButton bottoneA = new JButton("");
		bottoneA.setActionCommand("Button1");
		bottoneA.addActionListener((ActionListener)myRenderer);
                                row1.addElement(bottoneA);
		row1.addElement(bottoneA);
		rows.addElement(row1);
		DefaultTableModel tableModel = new DefaultTableModel(rows, columns){
                                @Override
                                public Class getColumnClass(int column){
                                return getValueAt(0, column).getClass();
                                }
                                };
		return tableModel;
	}

and at last, the renderer and actionListener class MyRenderer

class MyRenderer implements TableCellRenderer, ActionListener {
	public void actionPerformed(ActionEvent e) {
    	System.out.println("---->WORKS");
                }
    
	public Component getTableCellRendererComponent(JTable table, Object value,
						boolean isSelected, boolean hasFocus, int row, int column) {
		if(value instanceof Component){
			return (Component)value;
		}
	}
}

In the end, the buttons are displayed correctly since:
1) there is a renderer registered for them (using table.setDefaultRenderer(JButton.class, myRenderer);)
2) the tableModel DefaultTableModel returns the right class for the column cells so the rendered at 1) is used

What does not work, is the ActionListener, the ActionEvent is never triggered clicking the buttons in the cells.

I'm quite lost, i'd really appreciate a hand.

Thanks all and sorry for the english.
Roberto

TylerDurden83

Please don't post to old, dead threads. I'm locking this one, it's more than 3 years old.

db