/**
* Adds values to list of {@link UserItem}s which are above the first shown {@link UserItem}.
*
* @param values list of {@link UserItem}s
*/
public void prependValues(List<UserItem> values) {
if (values.size() > 0) {
List<UserItem> newItems = new ArrayList<UserItem>();
Set<Key> newKeys = new HashSet<Key>();
for (UserItem ui : values) {
RowWidget rowWidget = rows.get(ui.getKey());
boolean add = true;
if (rowWidget != null) {
setValue(ui);
add = false;
}
if (add) {
if (headKeys.contains(ui.getKey())) {
add = false;
int index = head.indexOf(ui);
head.set(index, ui);
}
}
if (add) {
newItems.add(ui);
newKeys.add(ui.getKey());
}
}
if (!newItems.isEmpty()) {
head.addAll(0, newItems);
headKeys.addAll(newKeys);
NewDataEvent.fire(this, NewDataType.NEW_DATA_AVAILABLE);
}
}
}
/** Does the actual addition of {@link UserItem}s to the top of the list. */
public void addTail() {
List<UserItem> l = tail;
if (l.size() > 0) {
tail = new ArrayList<UserItem>();
tailKeys = new HashSet<Key>();
for (UserItem e : l) {
RowWidget row = createRow(e);
flowPanel.add(row);
rows.put(row.getKey(), row);
}
rowsAdded();
NewDataEvent.fire(this, NewDataType.NEW_DATA_SHOWN);
}
}
/** Does the actual addition of {@link UserItem}s to the top of the list. */
private void addHead() {
List<UserItem> l = head;
if (l.size() > 0) {
head = new ArrayList<UserItem>();
headKeys = new HashSet<Key>();
int offsetHeight = flowPanel.getOffsetHeight();
for (int i = l.size() - 1; i >= 0; i--) {
UserItem e = l.get(i);
RowWidget row = createRow(e);
flowPanel.insert(row, 0);
rows.put(row.getKey(), row);
}
int deltaHeight = flowPanel.getOffsetHeight() - offsetHeight;
scrollPanel.setVerticalScrollPosition(scrollPanel.getVerticalScrollPosition() + deltaHeight);
rowsAdded();
NewDataEvent.fire(this, NewDataType.NEW_DATA_SHOWN);
}
}
public HandlerRegistration addNewDataHandler(NewDataHandler handler) {
return addHandler(handler, NewDataEvent.getType());
}