Makes each column of the given JTable exactly the right size it needs but not greater than the maxColumnWidth provided. - Java Swing

Description

Makes each column of the given JTable exactly the right size it needs but not greater than the maxColumnWidth provided.

Demo Code

/*//from   w  ww.j a  v a2s  . co  m
 * Copyright (c) 2008, SQL Power Group Inc.
 *
 * This file is part of SQL Power Library.
 *
 * SQL Power Library 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.
 *
 * SQL Power Library 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/>. 
 */
//package com.java2s;
import java.awt.Component;

import javax.swing.JTable;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;

public class Main {
    /**
     * Makes each column of the given table exactly the right size it needs but
     * not greater than the maxColumnWidth provided.  To have no restraints on the 
     * maximum column size, pass in a negative number for maxColumnWidth.  Note that
     * this method turns the table auto resize off.
     * 
     * @param table the table that will have its columns adjust to appropiate size
     * @param maxColumnWidth specifies the maximum width of the column, if no
     * maximum size are needed to be specified, pass in a negative number
     * @param padding the number of pixels of extra space to leave (the actual column
     * width will be the maximum width of any value in the column, plus this padding amount)
     */
    public static void fitColumnWidths(JTable table, int maxColumnWidth,
            int padding) {
        fitColumnWidths(table, -1, maxColumnWidth, padding);
    }

    /**
     * Makes each column of the given table exactly the right size it needs but
     * not greater than the maxColumnWidth provided and no less than the
     * minColumnWidth provided. To have no restraints on the maximum or minimum
     * column size, pass in a negative number for maxColumnWidth or
     * minColumnWidth respectively. Note that this method turns the table auto
     * resize off.
     * 
     * @param table
     *            the table that will have its columns adjust to appropiate size
     * @param maxColumnWidth
     *            specifies the maximum width of the column, if no maximum size
     *            are needed to be specified, pass in a negative number
     * @param padding
     *            the number of pixels of extra space to leave (the actual
     *            column width will be the maximum width of any value in the
     *            column, plus this padding amount)
     */
    public static void fitColumnWidths(JTable table, int minColumnWidth,
            int maxColumnWidth, int padding) {
        table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
        int limit = table.getColumnCount() > 5 ? 5 : table.getColumnCount();
        for (int colIndex = 0; colIndex < limit; colIndex++) {
            fitColumnWidth(table, colIndex, minColumnWidth, maxColumnWidth,
                    padding);
        }
    }

    /**
     * Makes each column of the given table exactly the right size with no 
     * constraints on how big the column width would go
     * 
     * @param table the table that will have its columns adjust to appropiate size
     * @param padding the number of pixels of extra space to leave (the actual column
     * width will be the maximum width of any value in the column, plus this padding amount)
     */
    public static void fitColumnWidths(JTable table, int padding) {
        fitColumnWidths(table, -1, padding);
    }

    /**
     * Sets the given column of the given table to be exactly as
     * wide as it needs to be to fit its current contents.  The contents
     * of each body cell in this column, as well as the header component
     * is taken into account.
     * 
     * @param table The table whose column to resize
     * @param colIndex The index of the column to resize 
     */
    public static void fitColumnWidth(JTable table, int colIndex,
            int padding) {
        fitColumnWidth(table, colIndex, -1, padding);
    }

    /**
     * Sets the given column of the given table to be exactly as
     * wide as it needs to be to fit its current contents, but not exceeding
     * a specified maximum.  The contents
     * of each body cell in this column, as well as the header component
     * is taken into account.
     * 
     * @param table The table whose column to resize
     * @param colIndex The index of the column to resize 
     * @param maxWidth The maximum width, in pixels, that the column is allowed
     * to have.  Nonpositive values mean "no maximum."
     */
    public static void fitColumnWidth(JTable table, int colIndex,
            int maxWidth, int padding) {
        fitColumnWidths(table, -1, maxWidth, padding);
    }

    /**
     * Sets the given column of the given table to be exactly as wide as it
     * needs to be to fit its current contents, but not exceeding a specified
     * maximum. The contents of each body cell in this column, as well as the
     * header component is taken into account.
     * 
     * @param table
     *            The table whose column to resize
     * @param colIndex
     *            The index of the column to resize
     * @param minWidth
     *            The minimum width, in pixels, that the column takes.
     *            Non-positive values means no minimum.
     * @param maxWidth
     *            The maximum width, in pixels, that the column is allowed to
     *            have. Nonpositive values mean "no maximum."
     */
    public static void fitColumnWidth(JTable table, int colIndex,
            int minWidth, int maxWidth, int padding) {
        TableColumn column = null;
        Component comp = null;
        int cellWidth = 0;
        TableCellRenderer headerRenderer = table.getTableHeader()
                .getDefaultRenderer();
        column = table.getColumnModel().getColumn(colIndex);

        comp = headerRenderer.getTableCellRendererComponent(table,
                column.getHeaderValue(), false, false, 0, colIndex);

        // Headers need additional padding for some reason!
        cellWidth = comp.getPreferredSize().width + 2;

        int limit = table.getRowCount() > 100 ? 100 : table.getRowCount();

        for (int j = 0; j < limit; j++) {
            final TableCellRenderer cellRenderer = table.getCellRenderer(j,
                    colIndex);
            if (cellRenderer == null)
                continue;
            comp = cellRenderer.getTableCellRendererComponent(table,
                    table.getValueAt(j, colIndex), false, false, j,
                    colIndex);

            // we add a one-pixel fudge factor here because the result is often too short by a pixel
            cellWidth = Math.max(cellWidth,
                    comp.getPreferredSize().width + 1);

            if (maxWidth > 0 && cellWidth >= maxWidth) {
                cellWidth = maxWidth;
                break;
            }
        }
        if (minWidth >= 0 && cellWidth < minWidth) {
            cellWidth = minWidth;
        }
        column.setPreferredWidth(cellWidth + padding);
    }
}

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