Set JTable columns minimal size to a size that always shows the complete header and content values. - Java Swing

Java examples for Swing:JTable Column

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Description

Set JTable columns minimal size to a size that always shows the complete header and content values.

Demo Code


//package com.java2s;
import java.awt.Component;
import javax.swing.JTable;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;
import javax.swing.table.TableColumnModel;

public class Main {
    /**/*from  ww  w . j  a  v  a2 s . c  o  m*/
     * Set columns minimal size to a size that always shows the complete header
     * and content values. HEAVY OPERATION !! Use the maxColumns field !!
     * 
     * @param table
     * @param maxRows
     *            the number of columns (starting at 0) that are used for
     *            width calculation. if <code><0</code> all columns will be used.
     * @param addToMinWidth
     *            this value will be added to the calculated minWidth
     * @param maxSize
     *            will be ignored if -1
     * 
     */
    public static void adjustColumnMinWidths(JTable table, int maxRows,
            int addToMinWidth, int maxSize) {
        TableColumnModel columnModel = table.getColumnModel();
        for (int col = 0; col < table.getColumnCount(); col++) {
            int maxwidth = 0;
            int lastRow;
            if ((maxRows > 0) && (maxRows < table.getRowCount())) {
                lastRow = maxRows;
            } else {
                lastRow = table.getRowCount();
            }

            for (int row = 0; row < lastRow; row++) {
                TableCellRenderer rend = table.getCellRenderer(row, col);
                Object value = null;
                try {
                    value = table.getValueAt(row, col);
                } catch (Exception e) {
                    e.printStackTrace();
                    table.getModel().getRowCount();
                    table.getValueAt(row, col);
                }
                Component comp = rend.getTableCellRendererComponent(table,
                        value, false, false, row, col);
                maxwidth = Math
                        .max(comp.getPreferredSize().width, maxwidth);
                String renderer = rend.getClass().getSimpleName();
            } // for row
            TableColumn column = columnModel.getColumn(col);
            TableCellRenderer headerRenderer = column.getHeaderRenderer();
            if (headerRenderer == null)

                headerRenderer = table.getTableHeader()
                        .getDefaultRenderer();
            Object headerValue = column.getHeaderValue();
            Component headerComp = headerRenderer
                    .getTableCellRendererComponent(table, headerValue,
                            false, false, 0, col);
            maxwidth = Math.max(maxwidth,
                    headerComp.getPreferredSize().width + 10);
            if (maxSize > 0 && maxwidth > maxSize) {
                maxwidth = maxSize;
            }
            column.setPreferredWidth(maxwidth + addToMinWidth);
        } // for col
    }
}

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