Resizes the JTable columns based on the column and data preferred widths. - Java Swing

Java examples for Swing:JTable Column

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Description

Resizes the JTable columns based on the column and data preferred widths.

Demo Code

/*//w w  w  .java 2 s . c  o m
 * Copyright 2008-2014, David Karnok 
 * The file is part of the Open Imperium Galactica project.
 * 
 * The code should be distributed under the LGPL license.
 * See http://www.gnu.org/licenses/lgpl.html for details.
 */
//package com.java2s;
import java.awt.Component;

import javax.swing.JTable;
import javax.swing.SwingConstants;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.DefaultTableColumnModel;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;

public class Main {
    /**
     * Resizes the table columns based on the column and data preferred widths.
     * @param table the original table
     * @param model the data model
     * @return the table itself
     */
    public static JTable autoResizeColWidth(JTable table,
            AbstractTableModel model) {
        table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
        table.setModel(model);

        int margin = 5;

        for (int i = 0; i < table.getColumnCount(); i++) {
            int vColIndex = i;
            DefaultTableColumnModel colModel = (DefaultTableColumnModel) table
                    .getColumnModel();
            TableColumn col = colModel.getColumn(vColIndex);
            int width;

            // Get width of column header
            TableCellRenderer renderer = col.getHeaderRenderer();

            if (renderer == null) {
                renderer = table.getTableHeader().getDefaultRenderer();
            }

            Component comp = renderer.getTableCellRendererComponent(table,
                    col.getHeaderValue(), false, false, 0, 0);

            width = comp.getPreferredSize().width;

            // Get maximum width of column data
            for (int r = 0; r < table.getRowCount(); r++) {
                renderer = table.getCellRenderer(r, vColIndex);
                comp = renderer.getTableCellRendererComponent(table,
                        table.getValueAt(r, vColIndex), false, false, r,
                        vColIndex);
                width = Math.max(width, comp.getPreferredSize().width);
            }

            // Add margin
            width += 2 * margin;

            // Set the width
            col.setPreferredWidth(width);
        }

        ((DefaultTableCellRenderer) table.getTableHeader()
                .getDefaultRenderer())
                .setHorizontalAlignment(SwingConstants.LEFT);

        // table.setAutoCreateRowSorter(true);
        //        table.getTableHeader().setReorderingAllowed(false);

        //        for (int i = 0; i < table.getColumnCount(); i++) {
        //            TableColumn column = table.getColumnModel().getColumn(i);
        // 
        //            column.setCellRenderer(new DefaultTableColour());
        //        }

        return table;
    }
}

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