calculate the optimal header width of the given JTable column - Java Swing

Java examples for Swing:JTable Column

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Description

calculate the optimal header width of the given JTable column

Demo Code

/*//from  w ww . j a  v  a 2 s.  co  m
 *   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 java.awt.Point;
import java.awt.Rectangle;
import javax.swing.JTable;
import javax.swing.JViewport;
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{
    private final JTable jtable;
    /**
     * calcs the optimal header width of the given column
     */
    public int calcHeaderWidth(int col) {
        return calcHeaderWidth(getJTable(), col);
    }
    /**
     * Calculates the optimal width for the header of the given table. The
     * calculation is based on the preferred width of the header renderer.
     * 
     * @param table the table to calculate the column width
     * @param col the column to calculate the widths
     * @return the width, -1 if error
     */
    public static int calcHeaderWidth(JTable table, int col) {
        if (table == null) {
            return -1;
        }

        if (col < 0 || col > table.getColumnCount()) {
            System.out.println("invalid col " + col);
            return -1;
        }

        JTableHeader header = table.getTableHeader();
        TableCellRenderer defaultHeaderRenderer = null;
        if (header != null) {
            defaultHeaderRenderer = header.getDefaultRenderer();
        }
        TableColumnModel columns = table.getColumnModel();
        table.getModel();
        TableColumn column = columns.getColumn(col);
        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, col);
            width = c.getPreferredSize().width + 5;
        }

        return width;
    }
    /**
     * returns the JTable
     */
    public JTable getJTable() {
        return jtable;
    }
}

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