Source Code : Setting Column Header Tool Tips in a JTable Components

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Setting Column Header Tool Tips in a JTable Components

 

import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionAdapter;
import java.util.HashMap;
import java.util.Map;

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

public class Main {
  public static void main(String[] argv) throws Exception {
    int rows = 10;
    int cols = 5;
    JTable table = new JTable(rows, cols);
    JTableHeader header = table.getTableHeader();

    ColumnHeaderToolTips tips = new ColumnHeaderToolTips();
    for (int c = 0; c < table.getColumnCount(); c++) {
      TableColumn col = table.getColumnModel().getColumn(c);
      tips.setToolTip(col, "Col " + c);
    }
    header.addMouseMotionListener(tips);
  }
}

class ColumnHeaderToolTips extends MouseMotionAdapter {
  TableColumn curCol;
  Map tips = new HashMap();
  public void setToolTip(TableColumn col, String tooltip) {
    if (tooltip == null) {
      tips.remove(col);
    } else {
      tips.put(col, tooltip);
    }
  }
  public void mouseMoved(MouseEvent evt) {
    JTableHeader header = (JTableHeader) evt.getSource();
    JTable table = header.getTable();
    TableColumnModel colModel = table.getColumnModel();
    int vColIndex = colModel.getColumnIndexAtX(evt.getX());
    TableColumn col = null;
    if (vColIndex >= 0) {
      col = colModel.getColumn(vColIndex);
    }
    if (col != curCol) {
      header.setToolTipText((String) tips.get(col));
      curCol = col;
    }
  }
}

   
  

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