Here you can find the source of setPreferredColumnWidths(final JTable table, final float[] columnWeigths, final boolean includeHeader)
| Parameter | Description |
|---|---|
| table | The JTable to adapt, non-null. |
| includeHeader | whether or not the header should be included. |
public static void setPreferredColumnWidths(final JTable table, final float[] columnWeigths, final boolean includeHeader)
//package com.java2s; /**//w w w . ja v a2 s . c om * This class holds utility methods which may be useful when dealing with JTables. * <p/> * <hr/> Copyright 2006-2012 Torsten Heup * <p/> * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with * the License. You may obtain a copy of the License at * <p/> * http://www.apache.org/licenses/LICENSE-2.0 * <p/> * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the * specific language governing permissions and limitations under the License. */ import javax.swing.*; import javax.swing.table.TableCellRenderer; import javax.swing.table.TableColumn; import javax.swing.table.TableColumnModel; public class Main { /** * This method will iterate over the given table's columns and attempt to find the optimal width for each. You might * want to do so after displaying a table for the first time or after updating the underlying model to ensure that * as much information as possible is shown. * * @param table The JTable to adapt, non-null. */ public static void setPreferredColumnWidths(final JTable table) { setPreferredColumnWidths(table, true); } /** * This method will iterate over the given table's columns and attempt to find the optimal width for each. You might * want to do so after displaying a table for the first time or after updating the underlying model to ensure that * as much information as possible is shown. * * @param table The JTable to adapt, non-null. * @param includeHeader whether or not the header should be included. */ public static void setPreferredColumnWidths(final JTable table, final float[] columnWeigths, final boolean includeHeader) { if (table == null) throw new IllegalArgumentException("Parameter 'table' must not be null!"); if (columnWeigths == null) throw new IllegalArgumentException("Parameter 'columnWeigths' must not be null!"); final int columnCount = table.getColumnCount(); final int rowCount = table.getRowCount(); if (columnWeigths != null && columnWeigths.length != columnCount) throw new IllegalArgumentException( "Illegal number of column weights, has to be equal to column count."); final TableColumnModel columnModel = table.getColumnModel(); float totalWeight = 0; for (float weight : columnWeigths) totalWeight += weight; if (totalWeight == 0) totalWeight = 1; for (int col = 0; col < columnCount; col++) { int max = 0; if (includeHeader && table.getTableHeader() != null) { final TableColumn column = columnModel.getColumn(col); final TableCellRenderer columnRenderer = column.getCellRenderer(); final TableCellRenderer renderer = columnRenderer != null ? columnRenderer : table.getTableHeader().getDefaultRenderer(); final int width = renderer.getTableCellRendererComponent(table, column.getHeaderValue(), false, table.hasFocus(), -1, col).getMinimumSize().width; if (width > max) max = width; } for (int row = 0; row < rowCount; row++) { final int width = table.getCellRenderer(row, col).getTableCellRendererComponent(table, table.getValueAt(row, col), table.isCellSelected(row, col), table.hasFocus(), row, col) .getMinimumSize().width; if (width > max) max = width; } final TableColumn column = columnModel.getColumn(col); column.setMinWidth(max); column.setPreferredWidth(Math.round(Integer.MAX_VALUE * (columnWeigths[col] / totalWeight))); } } /** * This method will iterate over the given table's columns and attempt to find the optimal width for each. You might * want to do so after displaying a table for the first time or after updating the underlying model to ensure that * as much information as possible is shown. * * @param table The JTable to adapt, non-null. * @param includeHeader whether or not the header should be included. */ public static void setPreferredColumnWidths(final JTable table, final boolean includeHeader) { if (table == null) throw new IllegalArgumentException("Parameter 'table' must not be null!"); final int rowCount = table.getRowCount(); final int columnCount = table.getColumnCount(); final TableColumnModel columnModel = table.getColumnModel(); for (int col = 0; col < columnCount; col++) { int max = 0; if (includeHeader && table.getTableHeader() != null) { final TableColumn column = columnModel.getColumn(col); final TableCellRenderer columnRenderer = column.getCellRenderer(); final TableCellRenderer renderer = columnRenderer != null ? columnRenderer : table.getTableHeader().getDefaultRenderer(); final int width = renderer.getTableCellRendererComponent(table, column.getHeaderValue(), false, table.hasFocus(), -1, col).getPreferredSize().width; if (width > max) max = width; } for (int row = 0; row < rowCount; row++) { final int width = table.getCellRenderer(row, col) .getTableCellRendererComponent(table, table.getValueAt(row, col), table.isCellSelected(row, col), table.hasFocus(), row, col) .getPreferredSize().width; if (width > max) max = width; } columnModel.getColumn(col).setPreferredWidth(max); } } }