ColumnFitAdapter.java

//$Header: /cvsroot-fuse/mec-as2/39/mendelson/util/tables/ColumnFitAdapter.java,v 1.1 2012/04/18 14:10:47 heller Exp $
package de.mendelson.util.tables;
import java.awt.Point;
import java.awt.Rectangle;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;
import javax.swing.JTable;
import javax.swing.table.*;
/*
 * Copyright (C) mendelson-e-commerce GmbH Berlin Germany
 *
 * This software is subject to the license agreement set forth in the license.
 * Please read and agree to all terms before using this software.
 * Other product and brand names are trademarks of their respective owners.
 */

/**
 *Adapter that allows to fit the size of columns on click, use it in the following way:
 *table.getTableHeader().addMouseListener(new ColumnFitAdapter());
 *
 */
public class ColumnFitAdapter extends MouseAdapter{
    
    public void mouseClicked(MouseEvent e){
        if(e.getClickCount()==2){
            JTableHeader header = (JTableHeader)e.getSource();
            
            TableColumn tableColumn = getResizingColumn(header, e.getPoint());
            if(tableColumn==null)
                return;
            int col = header.getColumnModel().getColumnIndex(tableColumn.getIdentifier());
            JTable table = header.getTable();
            int rowCount = table.getRowCount();
            int width = (int)header.getDefaultRenderer()
            .getTableCellRendererComponent(table, tableColumn.getIdentifier()
            , false, false, -1, col).getPreferredSize().getWidth();
            for(int row = 0; row<rowCount; row++){
                int preferedWidth = (int)table.getCellRenderer(row, col).getTableCellRendererComponent(table,
                        table.getValueAt(row, col), false, false, row, col).getPreferredSize().getWidth();
                width = Math.max(width, preferedWidth);
            }
            header.setResizingColumn(tableColumn); // this line is very important
            tableColumn.setWidth(width+table.getIntercellSpacing().width);
        }
    }
    
    // copied from BasicTableHeader.MouseInputHandler.getResizingColumn
    private TableColumn getResizingColumn(JTableHeader header, Point p){
        return getResizingColumn(header, p, header.columnAtPoint(p));
    }
    
    // copied from BasicTableHeader.MouseInputHandler.getResizingColumn
    private TableColumn getResizingColumn(JTableHeader header, Point p, int column){
        if(column==-1){
            return null;
        }
        Rectangle r = header.getHeaderRect(column);
        r.grow(-3, 0);
        if(r.contains(p))
            return null;
        int midPoint = r.x+r.width/2;
        int columnIndex;
        if(header.getComponentOrientation().isLeftToRight())
            columnIndex = (p.x<midPoint) ? column-1 : column;
        else
            columnIndex = (p.x<midPoint) ? column : column-1;
        if(columnIndex==-1)
            return null;
        return header.getColumnModel().getColumn(columnIndex);
    }
}