Java examples for Swing:JTable Column
Makes each column of the given JTable exactly the right width, so that the first and the last columns may have width values different from the middle ones.
/*/*from w w w . j a v a2 s.c om*/ * 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 width, so that the first and the last columns may have width * values different from the middle ones. * @param table the table that will have its columns adjust to appropriate size * @param firstColumnWidth specifies the width of the first column * @param middleColumnWidth specifies the width of the columns located between the first and the last ones * @param lastColumnWidth specifies the width of the last column * @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 adjustColWidth(JTable table, int firstColumnWidth, int middleColumnWidth, int lastColumnWidth, int padding) { int colCount = table.getColumnCount(); fitColumnWidth(table, 0, firstColumnWidth, firstColumnWidth, padding); for (int i = 1; i < colCount - 1; i++) { fitColumnWidth(table, i, middleColumnWidth, middleColumnWidth, padding); } fitColumnWidth(table, colCount - 1, lastColumnWidth, lastColumnWidth, padding); table.setAutoResizeMode(JTable.AUTO_RESIZE_OFF); } /** * 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); } /** * 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); } }