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Trying to hide  columns while using Default table Model - JTable

Posted on 2001-06-07
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Last Modified: 2012-08-13
I have extended JTable as follows...

public class MyTable extends JTable
{
    public MyTable()
    {
        super();
    }
    public MyTable(java.lang.String resourceTag, javax.swing.table.TableModel tableModel)
    {
        super(resourceTag, tableModel);
    }

    public void createDefaultColumnsFromModel()
    {       super.createDefaultColumnsFromModel();
        TableColumnModel model = getColumnModel();
columnModel.getColumn(3);
            this.removeColumn(column);
        }
        model.removeColumn(model.getColumn(3));
       
    }
}

in my Dialog I am implementing...

protected MyTable m_tblSetMetric = null;

m_tblmdlSetMetric     =  new MDefaultTableModel("setMetricLis", dataOut);
m_tblSetMetric           =   new MyTable("setMetricLis", m_tblmdlSetMetric);
m_tblSetMetric.createDefaultColumnsFromModel();
MTablePane tp           =   new MTablePane(12, true, null, (MTable)m_tblSetMetric, m_tblmdlSetMetric);
......

I am not getting any exception but the dialog doesn't show me the column names that I am trying to pull from properties file. If I comment out

model.removeColumn(model.getColumn(3));


line then it shows all the columns...Am I missing somethign or doing wrong...
Appreciate any help...
thanks

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Question by:manishkp
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by:Ovi
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This example works on the user defined number of rows/columns. To modify the numbers, modify the line   SmartTable table = new SmartTable(60, 10); To load your custom columns names set the appropiate number in the above line and modify the method : SmartTableModel.createHeaders() to make a trivial read from properties files.


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

public class TableColumnCustomizer extends JFrame  {
      JPanel actions = new JPanel();
  JSplitPane spliter = new JSplitPane();
  JLabel status = new JLabel("Status :");
  SmartTable table = new SmartTable(60, 10);
  TableColumnModel colModel = table.getColumnModel();
 
      public TableColumnCustomizer()  {
            super();
    init();
      }
 
  private void init() {
        setLocation(150, 100);
    setSize(800, 600);
    getContentPane().setLayout(new BorderLayout());
    // init actions
    initActions();
    spliter.setLeftComponent(new JScrollPane(actions));
    spliter.setRightComponent(new JScrollPane(table));
    getContentPane().add(spliter, BorderLayout.CENTER);
    getContentPane().add(status, BorderLayout.SOUTH);
  }
 
  private void initActions()  {
        int c = table.getColumnCount();
    actions.setLayout(new GridLayout(c, 1));
    for(int i=0; i<c; i++) {
          JCheckBox cb = new JCheckBox("Hide/Show column " + (i));
      cb.addActionListener(new ActionAdapter(i));
          actions.add(cb);
    }
  }
 
  class ActionAdapter implements ActionListener {
        int pos;
        TableColumn column;
 
        public ActionAdapter(int col)  {
              pos = col;
      column = colModel.getColumn(pos);
        }
   
        public void actionPerformed(ActionEvent ae) {
              JCheckBox tmp = (JCheckBox) ae.getSource();
              String lbl = tmp.getLabel();
              boolean selected = tmp.isSelected();
              status.setText(lbl + " : " + selected);
              int idx = Integer.parseInt(lbl.substring(lbl.length() - 2).trim());
              if(!selected) {
                    colModel.addColumn(column);
        colModel.moveColumn(table.getColumnCount() - 1, pos);
              } else {
                    colModel.removeColumn(column);
              }
      table.sizeColumnsToFit(-1);
        }
  }

      class SmartTable extends JTable {
        SmartTableModel model;
   
            public SmartTable(int rows, int cols) {
                  model = new SmartTableModel(rows, cols);
                  createColumns();
                  setModel(model);
                  setForeground(Color.red);
                  setBackground(new Color(255, 239, 185));
                  setGridColor(Color.orange);
                  setSelectionMode(ListSelectionModel.SINGLE_SELECTION);
                  setSelectedRow(0);
                  setSelectedCol(0);
            }
            
            protected void createColumns() {
                  for(int i = 0; i<model.getColumnCount(); i++) {
                        DefaultTableCellRenderer renderer = new DefaultTableCellRenderer();
                        renderer.setHorizontalAlignment(model.cols[i].alignment);
                        TableColumn column = new TableColumn(i, model.cols[i].width, renderer, null);
                        addColumn(column);
                  }
            }
   
            public void setSelectedRow(int row) {
                  if(row == -1)
                        return;
                  else {
                        setRowSelectionInterval(row, row);
                  }
            }
            
            public void setSelectedCol(int col) {
                  if(col == -1)
                        return;
                  else {
                        setColumnSelectionInterval(col, col);
                  }
            }            
      }
 
      class SmartTableModel extends AbstractTableModel {
        int rows = 10;
    int columns = 10;
            protected ColumnDescriptor[] cols;
            protected Vector dObjects;

            public SmartTableModel(int maxRows, int maxCols) {
                  dObjects = new Vector();
      rows = maxRows;
      columns = maxCols;
      createHeaders();
      addData();
                  addTableModelListener(new ModelAdapter());
            }
   
    private void createHeaders() {
          cols = new ColumnDescriptor[columns];
          for(int i=0; i<columns; i++) {
            ColumnDescriptor c = new ColumnDescriptor("Field" + String.valueOf((i)), 40,
        JLabel.LEFT);
        cols[i] = c;
          }
    }


            public void addData() {
                  dObjects.removeAllElements();
                  Vector data = new Vector();
                  for(int i=0; i<rows; i++) {
                        SmartData[] sd = new SmartData[columns];
                        for(int j=0; j<columns; j++) {
                          String d = "Cell [" + i + ", " + j + "]";
                      sd[j] = new SmartData(d);
                        }
                    data.addElement(sd);
                  }
                  for(int i = 0; i<data.size(); i++) {
                        dObjects.addElement((SmartData[]) data.elementAt(i));
                  }
                  updateObjects();
            }
   
    public SmartData getSmartData(int row, int col) {
          return(((SmartData[])dObjects.elementAt(row))[col]);
    }

            protected void updateObjects() {
                  fireTableDataChanged();
            }

            public int getColumnCount() {
                  return(cols.length);
            }

            public int getRowCount() {
                  return(dObjects.size());
            }

            public String getColumnName(int c) {
                  return(cols[c].name);
            }

            public boolean isCellEditable(int row, int col) {
      return(false);
            }

            public Object getValueAt(int row, int col) {
                  if(getRowCount() <= 0)
                        return "";
                  if(row<0||row>=getRowCount())
                        return "";
                  SmartData[] sd = (SmartData[]) dObjects.elementAt(row);
      return(sd[col].data);
            }
            //*******************************************************************
            class ModelAdapter implements TableModelListener  {
                  public void tableChanged(TableModelEvent tme) {
                  }
            }

      }
 
      class ColumnDescriptor {
        public String name;
        public int width;
        public int alignment;
        
        public ColumnDescriptor(String n, int w, int a) {
          name = n;
          width = w;
          alignment = a;
        }
      }
      
  class SmartData {
        String data;
   
        public SmartData(String d) {
          data = d;
        }
  }
 
      public static void main(String[] args) {
            (new TableColumnCustomizer()).setVisible(true);
      }
}
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