blob: b824c1cb65bbd2441567cb17bb3e1852e591774a (
plain)
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
|
/*
@VaadinApache2LicenseForJavaFiles@
*/
/**
*
*/
package com.vaadin.terminal.gwt.client.ui.dd;
import java.util.HashSet;
import com.vaadin.terminal.gwt.client.UIDL;
/**
*
*/
final public class VLazyInitItemIdentifiers extends VAcceptCriterion {
private boolean loaded = false;
private HashSet<String> hashSet;
private VDragEvent lastDragEvent;
@Override
public void accept(final VDragEvent drag, UIDL configuration,
final VAcceptCallback callback) {
if (lastDragEvent == null || lastDragEvent != drag) {
loaded = false;
lastDragEvent = drag;
}
if (loaded) {
Object object = drag.getDropDetails().get("itemIdOver");
if (hashSet.contains(object)) {
callback.accepted(drag);
}
} else {
VDragEventServerCallback acceptCallback = new VDragEventServerCallback() {
public void handleResponse(boolean accepted, UIDL response) {
hashSet = new HashSet<String>();
String[] stringArrayAttribute = response
.getStringArrayAttribute("allowedIds");
for (int i = 0; i < stringArrayAttribute.length; i++) {
hashSet.add(stringArrayAttribute[i]);
}
loaded = true;
if (accepted) {
callback.accepted(drag);
}
}
};
VDragAndDropManager.get().visitServer(acceptCallback);
}
}
@Override
public boolean needsServerSideCheck(VDragEvent drag, UIDL criterioUIDL) {
return loaded;
}
@Override
protected boolean accept(VDragEvent drag, UIDL configuration) {
return false; // not used is this implementation
}
}
|
