Highlight Currency Table
/*
Core SWING Advanced Programming
By Kim Topley
ISBN: 0 13 083292 8
Publisher: Prentice Hall
*/
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.event.WindowAdapter;
import java.awt.event.WindowEvent;
import java.text.NumberFormat;
import javax.swing.Icon;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JScrollPane;
import javax.swing.JTable;
import javax.swing.SwingConstants;
import javax.swing.UIManager;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.DefaultTableCellRenderer;
import javax.swing.table.TableCellRenderer;
import javax.swing.table.TableColumn;
import javax.swing.table.TableColumnModel;
public class HighlightCurrencyTable {
public static void main(String[] args) {
try {
UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
} catch (Exception evt) {}
JFrame f = new JFrame("Highlighted Currency Table");
JTable tbl = new JTable(new CurrencyTableModel());
tbl.setDefaultRenderer(java.lang.Number.class,
new FractionCellRenderer(10, 3, SwingConstants.RIGHT));
TableColumnModel tcm = tbl.getColumnModel();
tcm.getColumn(0).setPreferredWidth(150);
tcm.getColumn(0).setMinWidth(150);
TextWithIconCellRenderer renderer = new TextWithIconCellRenderer();
tcm.getColumn(0).setCellRenderer(renderer);
tbl.setShowHorizontalLines(false);
tbl.setIntercellSpacing(new Dimension(1, 0));
// Add the stipe renderer.
StripedTableCellRenderer.installInTable(tbl, Color.lightGray,
Color.white, null, null);
// Add the highlight renderer to the last column.
// The following comparator makes it highlight
// cells with negative numeric values.
Comparator cmp = new Comparator() {
public boolean shouldHighlight(JTable tbl, Object value, int row,
int column) {
if (value instanceof Number) {
double columnValue = ((Number) value).doubleValue();
return columnValue < (double) 0.0;
}
return false;
}
};
tcm.getColumn(3).setCellRenderer(
new HighlightRenderer(cmp, null, Color.pink, Color.black,
Color.pink.darker(), Color.white));
tbl.setAutoResizeMode(JTable.AUTO_RESIZE_OFF);
tbl.setPreferredScrollableViewportSize(tbl.getPreferredSize());
JScrollPane sp = new JScrollPane(tbl);
f.getContentPane().add(sp, "Center");
f.pack();
f.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent evt) {
System.exit(0);
}
});
f.setVisible(true);
}
}
class DataWithIcon {
public DataWithIcon(Object data, Icon icon) {
this.data = data;
this.icon = icon;
}
public Icon getIcon() {
return icon;
}
public Object getData() {
return data;
}
public String toString() {
return data.toString();
}
protected Icon icon;
protected Object data;
}
class CurrencyTableModel extends AbstractTableModel {
protected String[] columnNames = { "Currency", "Yesterday", "Today",
"Change" };
// Constructor: calculate currency change to create the last column
public CurrencyTableModel() {
for (int i = 0; i < data.length; i++) {
data[i][DIFF_COLUMN] = new Double(
((Double) data[i][NEW_RATE_COLUMN]).doubleValue()
- ((Double) data[i][OLD_RATE_COLUMN]).doubleValue());
}
}
// Implementation of TableModel interface
public int getRowCount() {
return data.length;
}
public int getColumnCount() {
return COLUMN_COUNT;
}
public Object getValueAt(int row, int column) {
return data[row][column];
}
public Class getColumnClass(int column) {
return (data[0][column]).getClass();
}
public String getColumnName(int column) {
return columnNames[column];
}
protected static final int OLD_RATE_COLUMN = 1;
protected static final int NEW_RATE_COLUMN = 2;
protected static final int DIFF_COLUMN = 3;
protected static final int COLUMN_COUNT = 4;
protected static final Class thisClass = CurrencyTableModel.class;
protected Object[][] data = new Object[][] {
{
new DataWithIcon("Belgian Franc", new ImageIcon(thisClass
.getResource("belgium.gif"))),
new Double(37.6460110), new Double(37.6508921), null },
{
new DataWithIcon("British Pound", new ImageIcon(thisClass
.getResource("gb.gif"))), new Double(0.6213051),
new Double(0.6104102), null },
{
new DataWithIcon("Canadian Dollar", new ImageIcon(thisClass
.getResource("canada.gif"))),
new Double(1.4651209), new Double(1.5011104), null },
{
new DataWithIcon("French Franc", new ImageIcon(thisClass
.getResource("france.gif"))),
new Double(6.1060001), new Double(6.0100101), null },
{
new DataWithIcon("Italian Lire", new ImageIcon(thisClass
.getResource("italy.gif"))),
new Double(1181.3668977), new Double(1182.104), null },
{
new DataWithIcon("German Mark", new ImageIcon(thisClass
.getResource("germany.gif"))),
new Double(1.8191804), new Double(1.8223421), null },
{
new DataWithIcon("Japanese Yen", new ImageIcon(thisClass
.getResource("japan.gif"))),
new Double(141.0815412), new Double(121.0040432), null } };
}
class FractionCellRenderer extends DefaultTableCellRenderer {
public FractionCellRenderer(int integer, int fraction, int align) {
this.integer = integer; // maximum integer digits
this.fraction = fraction; // exact number of fraction digits
this.align = align; // alignment (LEFT, CENTER, RIGHT)
}
protected void setValue(Object value) {
if (value != null && value instanceof Number) {
formatter.setMaximumIntegerDigits(integer);
formatter.setMaximumFractionDigits(fraction);
formatter.setMinimumFractionDigits(fraction);
setText(formatter.format(((Number) value).doubleValue()));
} else {
super.setValue(value);
}
setHorizontalAlignment(align);
}
protected int integer;
protected int fraction;
protected int align;
protected static NumberFormat formatter = NumberFormat.getInstance();
}
class StripedTableCellRenderer implements TableCellRenderer {
public StripedTableCellRenderer(TableCellRenderer targetRenderer,
Color evenBack, Color evenFore, Color oddBack, Color oddFore) {
this.targetRenderer = targetRenderer;
this.evenBack = evenBack;
this.evenFore = evenFore;
this.oddBack = oddBack;
this.oddFore = oddFore;
}
// Implementation of TableCellRenderer interface
public Component getTableCellRendererComponent(JTable table, Object value,
boolean isSelected, boolean hasFocus, int row, int column) {
TableCellRenderer renderer = targetRenderer;
if (renderer == null) {
// Get default renderer from the table
renderer = table.getDefaultRenderer(table.getColumnClass(column));
}
// Let the real renderer create the component
Component comp = renderer.getTableCellRendererComponent(table, value,
isSelected, hasFocus, row, column);
// Now apply the stripe effect
if (isSelected == false && hasFocus == false) {
if ((row & 1) == 0) {
comp.setBackground(evenBack != null ? evenBack : table
.getBackground());
comp.setForeground(evenFore != null ? evenFore : table
.getForeground());
} else {
comp.setBackground(oddBack != null ? oddBack : table
.getBackground());
comp.setForeground(oddFore != null ? oddFore : table
.getForeground());
}
}
return comp;
}
// Convenience method to apply this renderer to single column
public static void installInColumn(JTable table, int columnIndex,
Color evenBack, Color evenFore, Color oddBack, Color oddFore) {
TableColumn tc = table.getColumnModel().getColumn(columnIndex);
// Get the cell renderer for this column, if any
TableCellRenderer targetRenderer = tc.getCellRenderer();
// Create a new StripedTableCellRenderer and install it
tc.setCellRenderer(new StripedTableCellRenderer(targetRenderer,
evenBack, evenFore, oddBack, oddFore));
}
// Convenience method to apply this renderer to an entire table
public static void installInTable(JTable table, Color evenBack,
Color evenFore, Color oddBack, Color oddFore) {
StripedTableCellRenderer sharedInstance = null;
int columns = table.getColumnCount();
for (int i = 0; i < columns; i++) {
TableColumn tc = table.getColumnModel().getColumn(i);
TableCellRenderer targetRenderer = tc.getCellRenderer();
if (targetRenderer != null) {
// This column has a specific renderer
tc.setCellRenderer(new StripedTableCellRenderer(targetRenderer,
evenBack, evenFore, oddBack, oddFore));
} else {
// This column uses a class renderer - use a shared renderer
if (sharedInstance == null) {
sharedInstance = new StripedTableCellRenderer(null,
evenBack, evenFore, oddBack, oddFore);
}
tc.setCellRenderer(sharedInstance);
}
}
}
protected TableCellRenderer targetRenderer;
protected Color evenBack;
protected Color evenFore;
protected Color oddBack;
protected Color oddFore;
}
class TextWithIconCellRenderer extends DefaultTableCellRenderer {
protected void setValue(Object value) {
if (value instanceof DataWithIcon) {
if (value != null) {
DataWithIcon d = (DataWithIcon) value;
Object dataValue = d.getData();
setText(dataValue == null ? "" : dataValue.toString());
setIcon(d.getIcon());
setHorizontalTextPosition(SwingConstants.RIGHT);
setVerticalTextPosition(SwingConstants.CENTER);
setHorizontalAlignment(SwingConstants.LEFT);
setVerticalAlignment(SwingConstants.CENTER);
} else {
setText("");
setIcon(null);
}
} else {
super.setValue(value);
}
}
}
class HighlightRenderer implements TableCellRenderer {
public HighlightRenderer(Comparator cmp, TableCellRenderer targetRenderer,
Color backColor, Color foreColor, Color highlightBack,
Color highlightFore) {
this.cmp = cmp;
this.targetRenderer = targetRenderer;
this.backColor = backColor;
this.foreColor = foreColor;
this.highlightBack = highlightBack;
this.highlightFore = highlightFore;
}
public Component getTableCellRendererComponent(JTable tbl, Object value,
boolean isSelected, boolean hasFocus, int row, int column) {
TableCellRenderer renderer = targetRenderer;
if (renderer == null) {
renderer = tbl.getDefaultRenderer(tbl.getColumnClass(column));
}
Component comp = renderer.getTableCellRendererComponent(tbl, value,
isSelected, hasFocus, row, column);
if (isSelected == false && hasFocus == false && value != null) {
if (cmp.shouldHighlight(tbl, value, row, column)) {
comp.setForeground(highlightFore);
comp.setBackground(highlightBack);
} else {
comp.setForeground(foreColor);
comp.setBackground(backColor);
}
}
return comp;
}
protected Comparator cmp;
protected TableCellRenderer targetRenderer;
protected Color backColor;
protected Color foreColor;
protected Color highlightBack;
protected Color highlightFore;
}
interface Comparator {
public abstract boolean shouldHighlight(JTable tbl, Object value, int row,
int column);
}
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