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Re: Unexpected TableCellR

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  To: comp.lang.java.gui
Lorenzo wrote:
> hi all,
> 
> I wrote a customized renderer for a JTable but it is behaving
> differently from what I expected: even if I just acted on the
> BACKground color, when this render is selected the table does not show
> the content of the cells. Double-clicking on a cell shows the data
> correctly sorted in it but, as soon as the cell is de-selected, data
> re-become invisible.
> 
> Here is the code: can anybody please tell me what am I doing wrong?

The cell renderer is responsible for painting *everything* in the cell, including the contents.  Your renderer does 
nothing but set background and foreground colors, so no content is painted.  Since your renderer extends 
DefaultTableCellRenderer the solution is simple.  Just call the superclass getTableCellRendererComponent method before 
performing your work:

super.getTableCellRendererComponent(table,value,isSelected,hasFocus,row,column);
//do your stuff here
return this;

> 
> 
> lor
> 
> 
> 
> ****************************************************************************************************
> import java.awt.*;
> import java.awt.event.*;
> import java.awt.Transparency;
> import java.lang.Object.*;
> import javax.swing.*;
> import javax.swing.event.*;
> import javax.swing.table.*;
> 
> public class UDP_JTable extends JTable
> {
>     public UDP_JTable(int rows, int cols)
>     {
>         super(rows, cols);
>         for (int i=0; i<cols; i++)
>         {
>             getColumnModel().getColumn(i).setCellRenderer(new
> UDRenderer());
>         }
>     }
> 
>     class UDRenderer extends DefaultTableCellRenderer implements
> TableCellRenderer
>     {
>         public Component getTableCellRendererComponent(JTable table,
> Object value, boolean isSelected, boolean hasFocus, int row, int
> column)
>         {
>             setForeground(Color.BLACK);
>             if(row != column)
>             {
>                 if (row>column)
>                 {
>                     setBackground(Color.CYAN);
>                 }
>                 else
>                 {
>                     setBackground(Color.WHITE);
>                 }
>             }
>             else
>             {
>                 setBackground(Color.YELLOW);
>             }
>             return this;
>         }
>     }
> 
>     public static void main(String[] args)
>     {       
>     }
>     
> }
> 


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Unexpected TableCellRende "Lorenzo" <lorenzo@THRWHITE.remove-dii-this> - 2011-04-27 15:29 +0000
  Re: Unexpected TableCellR "Jim Sculley" <jim.sculley@THRWHITE.remove-dii-this> - 2011-04-27 15:29 +0000

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