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Posted on 2010-08-24 11:55 TWaver 閱讀(1147) 評論(0) 編輯 收藏
上文實現了renderer復用editor的功能，那么反過來editor是否也可以復用renderer的功能呢?而且第一篇提到“通過Java2D來繪制各種天花亂墜的效果”如何實現?這倆個疑問在以下代碼中都有了很好的解答，里面有不少技術細節，我就不多說了大家自己仔細看看。
其實Flex也有同樣的機制，可參見Example: Using an item renderer as an item editor
1  /** *//**
2 * A flag that indicates that the item renderer is also an item editor.
3 * If this property is <code>true</code>, Flex
4 * ignores the <code>itemEditor</code> property and uses the item
5 * renderer for that item as the editor.
6 *
7 * @default false
8 */
9 public var rendererIsEditor:Boolean = false;
1import java.awt.*;
2import java.awt.geom.*;
3import java.awt.event.*;
4import javax.swing.*;
5import javax.swing.border.*;
6import javax.swing.table.*;
7public class TableTest3 extends JFrame  {
8 JTable table;
9  Double[] values = new Double[]{new Double(0.1), new Double(0.3), new Double(0.8)};
10
11 // model
12 class TableModel extends AbstractTableModel{
13 public int getColumnCount() {
14 return 2;
15 }
16 public int getRowCount() {
17 return values.length;
18 }
19 public Object getValueAt(int rowIndex, int columnIndex) {
20 return values[rowIndex];
21 }
22 public void setValueAt(Object value, int rowIndex, int columnIndex) {
23 values[rowIndex] = (Double)value;
24 this.fireTableCellUpdated(rowIndex, 0);
25 }
26 public String getColumnName(int columnIndex) {
27 if(columnIndex == 0){
28 return "plain";
29 }else{
30 return "beauty";
31 }
32 }
33 public boolean isCellEditable(int rowIndex, int columnIndex) {
34 if(columnIndex == 0){
35 return false;
36 }else{
37 return true;
38 }
39 }
40 }
41
42 // cell editor
43 class Editor extends AbstractCellEditor implements TableCellEditor, ActionListener {
44 JSlider slider = new JSlider(JSlider.HORIZONTAL, 0, 100, 50);
45 TableCellRenderer renderer;
46 JButton actionButton;
47
48 Object value;
49 JTable table;
50 int row;
51 int column;
52
53 JPanel panel = new JPanel(new BorderLayout());
54
55 public Editor(TableCellRenderer renderer){
56 this.renderer = renderer;
57 actionButton = new JButton(new ImageIcon(TableTest3.class.getResource("dotdotdot.gif")));
58 actionButton.addActionListener(this);
59 actionButton.setFocusable(false);
60 actionButton.setFocusPainted(false);
61 actionButton.setMargin(new Insets(0, 0, 0, 0));
62 panel.add(actionButton, BorderLayout.EAST);
63 }
64
65 public Component getTableCellEditorComponent(JTable table, Object value, boolean isSelected, int row, int column){
66 this.value = value;
67 this.table = table;
68 this.row = row;
69 this.column = column;
70 panel.add(renderer.getTableCellRendererComponent(table, value, true, isSelected, row, column));
71 return panel;
72 }
73
74 public Object getCellEditorValue(){
75 return value;
76 }
77 public void actionPerformed(ActionEvent e) {
78 int intValue = (int)(((Number)value).doubleValue() * 100);
79 slider.setValue(intValue);
80
81 int result = JOptionPane.showOptionDialog(TableTest3.this,
82 slider, "change value",
83 JOptionPane.OK_CANCEL_OPTION, JOptionPane.PLAIN_MESSAGE, null, null, null);
84
85 if(result==JOptionPane.OK_OPTION) {
86 this.value = new Double(slider.getValue()/100.0);
87 this.fireEditingStopped();
88 }else{
89 this.fireEditingCanceled();
90 }
91 }
92 }
93
94 // cell render
95 class Renderer extends JComponent implements TableCellRenderer{
96 Border noFocusBorder = new EmptyBorder(1, 1, 1, 1);
97 Border focusBorder = UIManager.getBorder("Table.focusCellHighlightBorder");
98
99 private boolean hasFocus;
100 private Double value;
101
102 public void paintComponent(Graphics g) {
103 super.paintComponent(g);
104
105 if(hasFocus){
106 this.setBorder(focusBorder);
107 }else{
108 this.setBorder(noFocusBorder);
109 }
110 Dimension size = this.getSize();
111
112 Graphics2D g2 = (Graphics2D) g;
113 g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
114 GradientPaint gp = new GradientPaint(0, 0, Color.BLUE, size.width, 0, Color.YELLOW, true);
115 g2.setPaint(gp);
116 g2.fillRect(0, 0, size.width, size.height);
117
118 g2.setColor(Color.GREEN);
119 double r = (size.height - <IMG class=wp-smiley alt=8) src="http://twaver.servasoft.com/wp-includes/images/smilies/icon_cool.gif"> / 2.0;
120 int centerX = (int)(size.width * value.doubleValue());
121 int centerY = (int)r;
122 g2.fill(new Ellipse2D.Double(centerX-r, centerY-r+4, r * 2, r * 2));
123 }
124
125 public Component getTableCellRendererComponent(JTable table, Object value,
126 boolean isSelected, boolean hasFocus, int row, int column) {
127 this.hasFocus = hasFocus;
128 this.value = (Double)value;
129 this.setToolTipText(value + "");
130 return this;
131 }
132 }
133
134 public TableTest3(){
135 super("renderer used by editor");
136 table = new JTable(new TableModel());
137 TableColumn tableColumn = table.getColumnModel().getColumn(1);
138 tableColumn.setCellRenderer(new Renderer());
139 tableColumn.setCellEditor(new Editor(new Renderer()));
140
141 this.getContentPane().setLayout(new BorderLayout());
142 this.getContentPane().add(new JScrollPane(table), BorderLayout.CENTER);
143 this.setSize(500, 300);
144 this.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
145 }
146 public static void main(String[] args) {
147 new TableTest3().show();
148 }
149}
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