Setting Column Header Tool Tips in a JTable Components : Table « Swing JFC « Java

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Java » Swing JFC » Table

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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