1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
| 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);
}
}
} |
