Java JTable Column Size Calculate calcColumnWidths(JTable table)

Description

calc Column Widths

License

Open Source License

Declaration

public static void calcColumnWidths(JTable table) 

Method Source Code

//package com.java2s;
/*/*from   w w w  .  j a v a 2 s. c o m*/
 * Copyright (C) 2014 DobinRutishauser@broken.ch
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

import java.awt.Component;
import javax.swing.JTable;
import javax.swing.table.JTableHeader;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;
import javax.swing.table.TableColumnModel;
import javax.swing.table.TableModel;

public class Main {
    public static void calcColumnWidths(JTable table) {
        JTableHeader header = table.getTableHeader();

        TableCellRenderer defaultHeaderRenderer = null;

        if (header != null) {
            defaultHeaderRenderer = header.getDefaultRenderer();
        }

        TableColumnModel columns = table.getColumnModel();
        TableModel data = table.getModel();

        int margin = columns.getColumnMargin(); // only JDK1.3
        int rowCount = data.getRowCount();
        int totalWidth = 0;

        for (int i = columns.getColumnCount() - 1; i >= 0; --i) {
            TableColumn column = columns.getColumn(i);

            int columnIndex = column.getModelIndex();
            int width = -1;

            TableCellRenderer h = column.getHeaderRenderer();
            if (h == null) {
                h = defaultHeaderRenderer;
            }

            if (h != null) // Not explicitly impossible
            {
                Component c = h.getTableCellRendererComponent(table,
                        column.getHeaderValue(), false, false, -1, i);
                width = c.getPreferredSize().width;
            }

            for (int row = rowCount - 1; row >= 0; --row) {
                TableCellRenderer r = table.getCellRenderer(row, i);
                Component c = r.getTableCellRendererComponent(table,
                        data.getValueAt(row, columnIndex), false, false,
                        row, i);
                width = Math.max(width, c.getPreferredSize().width);
            }

            if (width >= 0) {
                column.setPreferredWidth(width + margin); // <1.3: without margin
            } else
                ; // ???

            totalWidth += column.getPreferredWidth();
        }
    }
}

Related

1. autoSizeCols(JTable table)
2. autoSizeTableColumns(JTable table)
3. calcColumnWidth(JTable table, int col)
4. calcColumnWidths(final JTable table)
5. calcColumnWidths(final JTable table)
6. calcColumnWidths(JTable table)
7. calculateColumnWidth(JTable table, int columnIndex)
8. calculateColumnWidth(JTable table, int columnIndex)
9. calculateColumnWidth_1(JTable table, int pos)