public void doListDataChange(ListDataEvent event) {
// when this is called _model is never null
final ListModel _model = _listbox.getModel();
final int newsz = _model.getSize(), oldsz = _listbox.getItemCount();
int min = event.getIndex0(), max = event.getIndex1(), cnt;
switch (event.getType()) {
case ListDataEvent.INTERVAL_ADDED:
cnt = newsz - oldsz;
if (cnt <= 0) throw new UiException("Adding causes a smaller list?");
if ((oldsz <= 0 || cnt > INVALIDATE_THRESHOLD) && !inPagingMold()) _listbox.invalidate();
// Bug 3147518: avoid memory leak
// Also better performance (outer better than remove a lot)
if (min < 0)
if (max < 0) min = 0;
else min = max - cnt + 1;
if (min > oldsz) min = oldsz;
ListitemRenderer renderer = null;
final Component next = min < oldsz ? _listbox.getItemAtIndex(min) : null;
while (--cnt >= 0) {
if (renderer == null) renderer = (ListitemRenderer) getRealRenderer();
_listbox.insertBefore(newUnloadedItem(renderer, min++), next);
}
break;
case ListDataEvent.INTERVAL_REMOVED:
cnt = oldsz - newsz;
if (cnt <= 0) throw new UiException("Removal causes a larger list?");
if (min >= 0) max = min + cnt - 1;
else if (max < 0) max = cnt - 1; // 0 ~ cnt - 1
if (max > oldsz - 1) max = oldsz - 1;
if ((newsz <= 0 || cnt > INVALIDATE_THRESHOLD) && !inPagingMold()) _listbox.invalidate();
// Bug 3147518: avoid memory leak
// Also better performance (outer better than remove a lot)
// detach from end (due to groopfoot issue)
Component comp = _listbox.getItemAtIndex(max);
while (--cnt >= 0) {
Component p = comp.getPreviousSibling();
comp.detach();
comp = p;
}
break;
default: // CONTENTS_CHANGED
syncModel(min, max);
}
}
public void render(final Comboitem item, final Object data, final int index) throws Exception {
final Combobox cb = (Combobox) item.getParent();
final ListModel<?> model = cb.getModel();
final int size = model.getSize();
final Template tm = resoloveTemplate(cb, item, data, index, size, "model");
if (tm == null) {
item.setLabel(Objects.toString(data));
item.setValue(data);
} else {
final ForEachStatus iterStatus =
new AbstractForEachStatus() { // provide iteration status in this context
private static final long serialVersionUID = 1L;
public int getIndex() {
return index;
}
public Object getEach() {
return data;
}
public Integer getEnd() {
return size;
}
};
final String var = (String) tm.getParameters().get(EACH_ATTR);
final String varnm = var == null ? EACH_VAR : var; // var is not specified, default to "each"
final String itervar = (String) tm.getParameters().get(STATUS_ATTR);
final String itervarnm =
itervar == null
? (var == null ? EACH_STATUS_VAR : varnm + STATUS_POST_VAR)
: itervar; // provide default value if not specified
// bug 1188, EL when nested var and itervar
Object oldVar = cb.getAttribute(varnm);
Object oldIter = cb.getAttribute(itervarnm);
cb.setAttribute(varnm, data);
cb.setAttribute(itervarnm, iterStatus);
final Component[] items = tm.create(cb, item, null, null);
cb.setAttribute(varnm, oldVar);
cb.setAttribute(itervarnm, oldIter);
if (items.length != 1)
throw new UiException("The model template must have exactly one item, not " + items.length);
final Comboitem nci = (Comboitem) items[0];
nci.setAttribute(BinderImpl.VAR, varnm); // for the converter to get the value
if (model instanceof ListSubModel) {
// ZK-992 wrong item when binding to combbox with submodel implementation
// combobox has a internal model as the submodel,
// I don't have way to access the submodel, and user doesn't has info to notify model[index]
// changed.
// so I set the value directly.
nci.setAttribute(varnm, data);
} else {
addItemReference(
cb, nci, index, varnm); // kept the reference to the data, before ON_BIND_INIT
}
nci.setAttribute(itervarnm, iterStatus);
// add template dependency
addTemplateTracking(cb, nci, data, index, size);
if (nci.getValue() == null) // template might set it
nci.setValue(data);
item.setAttribute("org.zkoss.zul.model.renderAs", nci);
// indicate a new item is created to replace the existent one
item.detach();
// bug #ZK-677: combobox selection is lost after reload model
// binding Comboitem immediately, @see BindUiLifeCycle#afterComponentAttached
Events.sendEvent(new Event(BinderImpl.ON_BIND_INIT, nci));
}
}
public int getTotalSize() {
final ListModel model = _listbox.getModel();
return model != null ? model.getSize() : _listbox.getVisibleItemCount();
}
private void syncModel0(int offset, int limit) {
int min = offset;
int max = offset + limit - 1;
final ListModel _model = _listbox.getModel();
final int newsz = _model.getSize();
final int oldsz = _listbox.getItemCount();
final Paginal _pgi = _listbox.getPaginal();
final boolean inPaging = inPagingMold();
final boolean shallInvalidated = // Bug 3147518: avoid memory leak
(min < 0 || min == 0) && (max < 0 || max >= newsz || max >= oldsz);
int newcnt = newsz - oldsz;
int atg = _pgi != null ? _listbox.getActivePage() : 0;
ListitemRenderer renderer = null;
Component next = null;
if (oldsz > 0) {
if (min < 0) min = 0;
else if (min > oldsz - 1) min = oldsz - 1;
if (max < 0) max = oldsz - 1;
else if (max > oldsz - 1) max = oldsz - 1;
if (min > max) {
int t = min;
min = max;
max = t;
}
int cnt = max - min + 1; // # of affected
if (_model instanceof GroupsListModel) {
// detach all from end to front since groupfoot
// must be detached before group
newcnt += cnt; // add affected later
if ((shallInvalidated || newcnt > INVALIDATE_THRESHOLD) && !inPaging) _listbox.invalidate();
// Bug 3147518: avoid memory leak
// Also better performance (outer better than remove a lot)
Component comp = _listbox.getItemAtIndex(max);
next = comp.getNextSibling();
while (--cnt >= 0) {
Component p = comp.getPreviousSibling();
comp.detach();
comp = p;
}
} else { // ListModel
int addcnt = 0;
Component item = _listbox.getItemAtIndex(min);
while (--cnt >= 0) {
next = item.getNextSibling();
if (cnt < -newcnt) { // if shrink, -newcnt > 0
item.detach(); // remove extra
} else if (((Listitem) item).isLoaded()) {
if (renderer == null) renderer = (ListitemRenderer) getRealRenderer();
item.detach(); // always detach
_listbox.insertBefore(newUnloadedItem(renderer, min), next);
++addcnt;
}
++min;
item = next; // B2100338.,next item could be Paging, don't use Listitem directly
}
if ((shallInvalidated
|| addcnt > INVALIDATE_THRESHOLD
|| addcnt + newcnt > INVALIDATE_THRESHOLD)
&& !inPagingMold()) _listbox.invalidate();
// Bug 3147518: avoid memory leak
// Also better performance (outer better than remove a lot)
}
} else {
min = 0;
}
for (; --newcnt >= 0; ++min) {
if (renderer == null) renderer = (ListitemRenderer) getRealRenderer();
_listbox.insertBefore(newUnloadedItem(renderer, min), next);
}
if (_pgi != null) {
if (atg >= _pgi.getPageCount()) atg = _pgi.getPageCount() - 1;
_pgi.setActivePage(atg);
}
}
