What this is

This file is part of the Tame Swing collection that we have compiled. All of the Java source code in these examples was created by Nobuo Tamemasa. As these examples have become hard to find on the internet, we have put them in one place here, supported by minimal advertising. In time we will include images of each running sample Java/Swing application.

The intent of having these files here is to help you learn Java and Swing by example, and Tame certainly created some terrific examples of the power of the Swing framework.

Other links

Keywords/tags

java, swing, example, sample, source, custom, table, jtable, header, cell, renderer, editor, button, action, event, click, clickable

The source code

/* (swing1.1) */
package tame.examples;

import java.awt.BorderLayout;
import java.awt.Component;
import java.awt.Insets;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;

import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.table.DefaultTableModel;
import javax.swing.table.JTableHeader;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumnModel;

/**
@author Nobuo Tamemasa
@version 1.0 02/25/99
*/
public class PushableHeaderExample extends JPanel {

  public PushableHeaderExample(){
    setLayout(new BorderLayout());
    String[] headerStr = {"Push","me","here"};

    DefaultTableModel dm = new DefaultTableModel(headerStr, 4);
    JTable table = new JTable(dm);
    ButtonHeaderRenderer renderer = new ButtonHeaderRenderer();
    TableColumnModel model = table.getColumnModel();
    int n = headerStr.length;
    for (int i=0;i<n;i++) {
      model.getColumn(i).setHeaderRenderer(renderer);
    }

    JTableHeader header = table.getTableHeader();
    header.addMouseListener(new HeaderListener(header,renderer));
    JScrollPane pane = new JScrollPane(table);
    add(pane, BorderLayout.CENTER);
  }

  public static void main(String[] args) {
    JFrame f= new JFrame("PushableHeaderTable Example");
    f.getContentPane().add(new PushableHeaderExample(), BorderLayout.CENTER);
    f.setSize(400, 100);
    f.setVisible(true);
    f.addWindowListener(new WindowAdapter() {
      public void windowClosing(WindowEvent e) {System.exit(0);}
    });
  }

  class HeaderListener extends MouseAdapter {
    JTableHeader   header;
    ButtonHeaderRenderer renderer;

    HeaderListener(JTableHeader header,ButtonHeaderRenderer renderer) {
      this.header   = header;
      this.renderer = renderer;
    }

    public void mousePressed(MouseEvent e) {
      int col = header.columnAtPoint(e.getPoint());
      renderer.setPressedColumn(col);
      header.repaint();

      System.out.println("Ouch! " + col);
    }

    public void mouseReleased(MouseEvent e) {
      int col = header.columnAtPoint(e.getPoint());
      renderer.setPressedColumn(-1);                // clear
      header.repaint();
    }
  }

  class ButtonHeaderRenderer extends JButton implements TableCellRenderer {
    int pushedColumn;

    public ButtonHeaderRenderer() {
      pushedColumn   = -1;
      setMargin(new Insets(0,0,0,0));
    }

    public Component getTableCellRendererComponent(JTable table, Object value,
                   boolean isSelected, boolean hasFocus, int row, int column) {
      setText((value ==null) ? "" : value.toString());
      boolean isPressed = (column == pushedColumn);
      getModel().setPressed(isPressed);
      getModel().setArmed(isPressed);
      return this;
    }

    public void setPressedColumn(int col) {
      pushedColumn = col;
    }
  }
}