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1 package org.sapia.gumby.view.binding;
2
3 import java.util.ArrayList  ;
4 import java.util.Collection ;
5 import java.util.Iterator ;
6 import java.util.Vector ;
7
8 import javax.swing.JList ;
9
10 import org.apache.commons.jxpath.JXPathContext;
11 import org.sapia.gumby.view.View;
12
13
28 public class ListBinding extends AbstractJXPathBinding {
29
30 private Collection _options;
31
32 public void onBound(View owner, Object model) {
33 JList list = (JList ) acquireWidget(owner);
34 initList(list, model);
35 }
36
37 public void onChanged(View owner, Object model) {
38 onBound(owner, model);
39 }
40
41 public void onUpdated(View owner, Object model) {
42 onBound(owner, model);
43 }
44
45 public void updateModel(View owner, Object model) {
46 JXPathContext ctx = JXPathContext.newContext(model);
47 ctx.setLenient(false);
48 JList list = (JList ) acquireWidget(owner);
49 Collection newValues = new ArrayList ();
50 if(list.getSelectedIndex() >= 0) {
51 Object [] selected = list.getSelectedValues();
52 for(int i = 0; i < selected.length; i++) {
53 newValues.add(selected[i]);
54 }
55 try {
56 _expr.setValue(ctx, newValues);
57 } catch(RuntimeException e) {
58 Collection currentValues = (Collection ) _expr.getValue(ctx);
59 if(currentValues != null) {
60 currentValues.clear();
61 currentValues.addAll(newValues);
62 }
63 }
64 }
65 }
66
67 public void setOptions(Collection options) {
68 _options = options;
69 }
70
71 public void addOption(Object option) {
72 if(_options == null) {
73 _options = new ArrayList ();
74 }
75 _options.add(option);
76 }
77
78 private void initList(JList comp, Object model) {
79 JXPathContext ctx = JXPathContext.newContext(model);
80 ctx.setLenient(true);
81 Collection values = (Collection ) _expr.getValue(ctx);
82 Vector data = new Vector ();
83 if(values != null) {
84 if(_options != null) {
85 Iterator valuesItr = values.iterator();
86 while(valuesItr.hasNext()) {
87 Object value = valuesItr.next();
88 Iterator options = _options.iterator();
89 int count = 0;
90 while(options.hasNext()) {
91 Object current = options.next();
92 data.add(current);
93 if(current.equals(value)) {
94 comp.setSelectedIndex(count);
95 }
96 count++;
97 }
98 }
99 }
100 } else if(_options != null) {
101 Iterator options = _options.iterator();
102 while(options.hasNext()) {
103 data.add(options.next());
104 }
105 }
106 comp.setListData(data);
107 }
108 }
109 |
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