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JAVA JTable JButton in JTable header

The following code add JButtons in JTable header and header listens to mouse event.

//Example modified from http://www.crionics.com/products/opensource/faq/swing_ex/JTableExamples2.html
/**
* @version 1.0 12/03/98
*/


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

 

/**
* @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) {
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;
}
}
}

 

 


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Best books about JAVA programming from Amazon
Professional Java, JDK 5 Edition (Paperback Simply Java Programming: An Application-Driven Tutorial Approach (Paperback) Effective Java Programming Language Guide (Paperback) Head First Java, 2nd Edition (Paperback) Java : An Introduction to Problem Solving and Programming (4th Edition)

 

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