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The Waikato Environment for Knowledge Analysis (WEKA), a machine
learning workbench. This version represents the developer version, the
"bleeding edge" of development, you could say. New functionality gets added
to this version.
/*
* This program 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.
*
* This program 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
* Taken from the newsgoup de.comp.lang.java with some modifications.
* Taken from FOPPS/EnhancedTable - http://fopps.sourceforge.net/
*
* @param table the table to calculate the column width
* @param col the column to calculate the widths
* @return the width, -1 if error
*/
public static int calcColumnWidth(JTable table, int col) {
int width = calcHeaderWidth(table, col);
if (width == -1) {
return width;
}
TableColumnModel columns = table.getColumnModel();
TableModel data = table.getModel();
int rowCount = data.getRowCount();
columns.getColumn(col);
try {
for (int row = rowCount - 1; row >= 0; --row) {
Component c = table.prepareRenderer(table.getCellRenderer(row, col),
row, col);
width = Math.max(width, c.getPreferredSize().width + 10);
}
} catch (Exception e) {
e.printStackTrace();
}
return width;
}
/**
* calcs the optimal header width of the given column
*/
public int calcHeaderWidth(int col) {
return calcHeaderWidth(getJTable(), col);
}
/**
* Calculates the optimal width for the header of the given table. The
* calculation is based on the preferred width of the header renderer.
*
* @param table the table to calculate the column width
* @param col the column to calculate the widths
* @return the width, -1 if error
*/
public static int calcHeaderWidth(JTable table, int col) {
if (table == null) {
return -1;
}
if (col < 0 || col > table.getColumnCount()) {
System.out.println("invalid col " + col);
return -1;
}
JTableHeader header = table.getTableHeader();
TableCellRenderer defaultHeaderRenderer = null;
if (header != null) {
defaultHeaderRenderer = header.getDefaultRenderer();
}
TableColumnModel columns = table.getColumnModel();
table.getModel();
TableColumn column = columns.getColumn(col);
int width = -1;
TableCellRenderer h = column.getHeaderRenderer();
if (h == null) {
h = defaultHeaderRenderer;
}
if (h != null) {
// Not explicitly impossible
Component c = h.getTableCellRendererComponent(table,
column.getHeaderValue(), false, false, -1, col);
width = c.getPreferredSize().width + 5;
}
return width;
}
/**
* sets the optimal column width for the given column
*/
public void setOptimalColumnWidth(int col) {
setOptimalColumnWidth(getJTable(), col);
}
/**
* sets the optimal column width for the given column
*/
public static void setOptimalColumnWidth(JTable jtable, int col) {
int width;
TableColumn column;
JTableHeader header;
if ((col >= 0) && (col < jtable.getColumnModel().getColumnCount())) {
width = calcColumnWidth(jtable, col);
if (width >= 0) {
header = jtable.getTableHeader();
column = jtable.getColumnModel().getColumn(col);
column.setPreferredWidth(width);
jtable.sizeColumnsToFit(-1);
header.repaint();
}
}
}
/**
* sets the optimal column width for all columns
*/
public void setOptimalColumnWidth() {
setOptimalColumnWidth(getJTable());
}
/**
* sets the optimal column width for alls column if the given table
*/
public static void setOptimalColumnWidth(JTable jtable) {
int i;
for (i = 0; i < jtable.getColumnModel().getColumnCount(); i++) {
setOptimalColumnWidth(jtable, i);
}
}
/**
* sets the optimal header width for the given column
*/
public void setOptimalHeaderWidth(int col) {
setOptimalHeaderWidth(getJTable(), col);
}
/**
* sets the optimal header width for the given column
*/
public static void setOptimalHeaderWidth(JTable jtable, int col) {
int width;
TableColumn column;
JTableHeader header;
if ((col >= 0) && (col < jtable.getColumnModel().getColumnCount())) {
width = calcHeaderWidth(jtable, col);
if (width >= 0) {
header = jtable.getTableHeader();
column = jtable.getColumnModel().getColumn(col);
column.setPreferredWidth(width);
jtable.sizeColumnsToFit(-1);
header.repaint();
}
}
}
/**
* sets the optimal header width for all columns
*/
public void setOptimalHeaderWidth() {
setOptimalHeaderWidth(getJTable());
}
/**
* sets the optimal header width for alls column if the given table
*/
public static void setOptimalHeaderWidth(JTable jtable) {
int i;
for (i = 0; i < jtable.getColumnModel().getColumnCount(); i++) {
setOptimalHeaderWidth(jtable, i);
}
}
/**
* Assumes table is contained in a JScrollPane. Scrolls the cell (rowIndex,
* vColIndex) so that it is visible within the viewport.
*/
public void scrollToVisible(int row, int col) {
scrollToVisible(getJTable(), row, col);
}
/**
* Assumes table is contained in a JScrollPane. Scrolls the cell (rowIndex,
* vColIndex) so that it is visible within the viewport.
*/
public static void scrollToVisible(JTable table, int row, int col) {
if (!(table.getParent() instanceof JViewport)) {
return;
}
JViewport viewport = (JViewport) table.getParent();
// This rectangle is relative to the table where the
// northwest corner of cell (0,0) is always (0,0).
Rectangle rect = table.getCellRect(row, col, true);
// The location of the viewport relative to the table
Point pt = viewport.getViewPosition();
// Translate the cell location so that it is relative
// to the view, assuming the northwest corner of the
// view is (0,0)
rect.setLocation(rect.x - pt.x, rect.y - pt.y);
// Scroll the area into view
viewport.scrollRectToVisible(rect);
}
}