001// License: GPL. For details, see LICENSE file.
002package org.openstreetmap.josm.gui.util;
003
004import java.awt.Component;
005
006import javax.swing.JTable;
007import javax.swing.table.TableCellRenderer;
008
009/**
010 * The class that provide common JTable customization methods
011 */
012public final class TableHelper {
013
014    private TableHelper() {
015        // Hide default constructor for utils classes
016    }
017
018    /**
019     * adjust the preferred width of column col to the maximum preferred width of the cells
020     * requires JTable.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
021     * @param tbl table
022     * @param col column index
023     * @param maxColumnWidth maximum column width
024     */
025    public static void adjustColumnWidth(JTable tbl, int col, int maxColumnWidth) {
026        int maxwidth = 0;
027        for (int row = 0; row < tbl.getRowCount(); row++) {
028            TableCellRenderer tcr = tbl.getCellRenderer(row, col);
029            Object val = tbl.getValueAt(row, col);
030            Component comp = tcr.getTableCellRendererComponent(tbl, val, false, false, row, col);
031            maxwidth = Math.max(comp.getPreferredSize().width, maxwidth);
032        }
033        tbl.getColumnModel().getColumn(col).setPreferredWidth(Math.min(maxwidth+10, maxColumnWidth));
034    }
035
036    /**
037     * adjust the table's columns to fit their content best
038     * requires JTable.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
039     * @param tbl table
040     * @since 14476
041     */
042    public static void computeColumnsWidth(JTable tbl) {
043        for (int column = 0; column < tbl.getColumnCount(); column++) {
044            adjustColumnWidth(tbl, column, Integer.MAX_VALUE);
045        }
046    }
047}