Listening for Clicks on a Column Header in a JTable Component : JTableHeader « Swing « Java Tutorial

1. Java Tutorial
2. Swing
3. JTableHeader

import java.awt.Rectangle;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

import javax.swing.JTable;
import javax.swing.table.JTableHeader;
import javax.swing.table.TableColumnModel;

public class Main {
  public static void main(String[] argv) throws Exception {
    JTable table = new JTable(5, 5);
    JTableHeader header = table.getTableHeader();
    header.addMouseListener(new ColumnHeaderListener());
  }
}
class ColumnHeaderListener extends MouseAdapter {
  public void mouseClicked(MouseEvent evt) {
    JTable table = ((JTableHeader) evt.getSource()).getTable();
    TableColumnModel colModel = table.getColumnModel();

    int index = colModel.getColumnIndexAtX(evt.getX());
    if (index == -1) {
      return;
    }
    Rectangle headerRect = table.getTableHeader().getHeaderRect(index);
    if (index == 0) {
      headerRect.width -= 10;
    } else {
      headerRect.grow(-10, 0);
    }
    if (!headerRect.contains(evt.getX(), evt.getY())) {
      int vLeftColIndex = index;
      if (evt.getX() < headerRect.x) {
        vLeftColIndex--;
      }
    }
  }
}

14.61.JTableHeader
	14.61.1.	Removing the Column Headers from a Scrollable in a JTable Component
	14.61.2.	Removing Column Headers: provide empty strings as the column header names.
	14.61.3.	Hiding column headers: table.setTableHeader(null);
	14.61.4.	Using Tooltips in Table Headers: Showing Tooltip Text in a Table Header
	14.61.5.	Customizing Column Headers with Icons
	14.61.6.	Creating a Custom Column Header Renderer in a JTable Component
	14.61.7.	Setting Column Header Tool Tips in a JTable Components
	14.61.8.	Customizing a JTableHeader Look and Feel
	14.61.9.	Showing the Table Header in a Non-Scrollable JTable Component
	14.61.10.	Implementing Variable-Height Column Headers in a JTable Component
	14.61.11.	Listening for Clicks on a Column Header in a JTable Component