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| import java.awt.BorderLayout;
import java.awt.Color;
import java.util.Arrays;
import java.util.Iterator;
import java.util.Map;
import java.util.NoSuchElementException;
import java.util.Objects;
import java.util.OptionalDouble;
import java.util.concurrent.ThreadLocalRandom;
import java.util.function.Function;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import java.util.stream.StreamSupport;
import javax.swing.BorderFactory;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTable;
import javax.swing.event.TableModelEvent;
import javax.swing.event.TableModelListener;
import javax.swing.table.AbstractTableModel;
import javax.swing.table.DefaultTableModel;
import com.jidesoft.swing.JideScrollPane;
public class JTableWithFooterExemple {
public static void main(String[] args) {
JFrame frame = new JFrame("Exemple");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
String[] cols = {"Col1","Col2","Col3"};
Object[][] datas = new Object[30][cols.length];
for(int i=0; i<datas.length; i++) {
datas[i][0]=i%2==0?"toto":null;
for(int j=1; j<datas[i].length; j++) {
datas[i][j]=ThreadLocalRandom.current().nextDouble(-100,100);
}
}
DefaultTableModel model = new DefaultTableModel(datas, cols) {
public java.lang.Class<?> getColumnClass(int columnIndex) {
switch(columnIndex) {
case 0:
return String.class;
default:
return Double.class;
}
}
};
JTable table = new JTable(model);
table.setFillsViewportHeight(true);
JideScrollPane scrollPane = new JideScrollPane(table);
scrollPane.setColumnHeaderView(table.getTableHeader());
JTable footer = new JTable(new FooterTableModel(model,
new FooterTableModel.ColumnFooter<String, Long>(0, String.class, s-> s.filter(Objects::nonNull).filter(x->!x.isEmpty()).count()),
new FooterTableModel.ColumnFooter<Double, Double>(1, Double.class, s-> s.mapToDouble(d->d.doubleValue()).sum()),
new FooterTableModel.ColumnFooter<Double, Double>(2, Double.class, s-> {
OptionalDouble od = s.mapToDouble(d->d.doubleValue()).average();
if ( od.isPresent() ) {
return od.getAsDouble();
}
return null;
})
));
footer.setFillsViewportHeight(false);
footer.setRowSelectionAllowed(false);
footer.setColumnSelectionAllowed(false);
footer.setBorder(BorderFactory.createEmptyBorder(3,0,0,0));
JPanel panelFooter = new JPanel(new BorderLayout());
panelFooter.setBorder(BorderFactory.createMatteBorder(3, 0, 0, 0, Color.RED));
panelFooter.add(footer);
scrollPane.setColumnFooterView(panelFooter);
footer.setColumnModel(table.getColumnModel());
frame.add(scrollPane);
frame.setSize(640, 400);
frame.setLocationRelativeTo(null);
frame.setVisible(true);
}
public static class FooterTableModel extends AbstractTableModel implements TableModelListener {
final private AbstractTableModel tableModel;
final private Map<Integer, ColumnFooter<?,?>> columnFooters;
private Object[] data;
public FooterTableModel(AbstractTableModel tableModel, ColumnFooter<?,?>...footers) {
this.tableModel=tableModel;
this.columnFooters=Arrays.stream(footers).collect(Collectors.toMap(ColumnFooter::getColumnIndex, Function.identity()));
init();
tableModel.addTableModelListener(this);
}
private void init() {
data = new Object[tableModel.getRowCount()];
updateAllColumns();
}
private void updateAllColumns() {
columnFooters.values().forEach(this::updateColumn);
}
@SuppressWarnings({ "rawtypes", "unchecked" })
private void updateColumn(ColumnFooter footer) {
columnAsStream(footer.getColumnIndex()).forEach(System.out::println);
setValueAt(footer.compute(columnAsStream(footer.getColumnIndex()).map(footer::cast)), 0, footer.getColumnIndex());
}
public void updateColumn(int columnIndex) {
ColumnFooter<?, ?> footer = columnFooters.get(columnIndex);
if ( footer==null ) {
setValueAt(null, 0, columnIndex);
}
else {
updateColumn(footer);
}
}
private Stream<?> columnAsStream(final int columnIndex) {
Iterable<?> iter = new Iterable<Object>() {
@Override
public Iterator<Object> iterator() {
return new Iterator<Object>() {
private int rowIndex=0;
@Override
public boolean hasNext() {
return rowIndex<tableModel.getRowCount();
}
@Override
public Object next() {
if ( hasNext() ) {
return tableModel.getValueAt(rowIndex++, columnIndex);
}
throw new NoSuchElementException();
}
};
}
};
return StreamSupport.stream(iter.spliterator(), false);
}
@Override
public int getColumnCount() {
return tableModel.getColumnCount();
}
@Override
public int getRowCount() {
return 1;
}
@Override
public Object getValueAt(int rowIndex, int columnIndex) {
if ( rowIndex!=0 ) {
throw new IndexOutOfBoundsException();
}
return data[columnIndex];
}
@Override
public void setValueAt(Object value, int rowIndex, int columnIndex) {
if ( rowIndex!=0 ) {
throw new IndexOutOfBoundsException();
}
data[columnIndex]=value;
fireTableCellUpdated(rowIndex, columnIndex);
}
@Override
public void tableChanged(TableModelEvent event) {
switch (event.getType()) {
case TableModelEvent.ALL_COLUMNS:
init();
break;
case TableModelEvent.INSERT:
updateAllColumns();
break;
case TableModelEvent.UPDATE:
int columnIndex = event.getColumn();
updateColumn(columnIndex);
default:
break;
}
}
public static class ColumnFooter<T, R> {
private final Class<T> c;
private final Function<Stream<T>, R> function;
private final int columnIndex;
public ColumnFooter(int columnIndex, Class<T> c, Function<Stream<T>,R> function) {
this.columnIndex=columnIndex;
this.c=Objects.requireNonNull(c);
this.function=Objects.requireNonNull(function);
}
public R compute(Stream<T> values) {
return function.apply(values);
}
public int getColumnIndex() {
return columnIndex;
}
public T cast(Object value) {
return c.cast(value);
}
}
} |
Calcul de total en bas de colonne d'un Jtable
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