/** Builds view for measuring */
private void buildViewForMeasuring() {
// clear all items
if (itemsLayout != null) {
recycle.recycleItems(itemsLayout, firstItem, new ItemsRange());
} else {
createItemsLayout();
}
// add views
int addItems = visibleItems / 2;
for (int i = currentItem + addItems; i >= currentItem - addItems; i--) {
if (addViewItem(i, true)) {
firstItem = i;
}
}
}
/**
* Rebuilds wheel items if necessary. Caches all unused items.
*
* @return true if items are rebuilt
*/
private boolean rebuildItems() {
boolean updated = false;
ItemsRange range = getItemsRange();
if (itemsLayout != null) {
int first = recycle.recycleItems(itemsLayout, firstItem, range);
updated = firstItem != first;
firstItem = first;
} else {
createItemsLayout();
updated = true;
}
if (!updated) {
updated = firstItem != range.getFirst() || itemsLayout.getChildCount() != range.getCount();
}
if (firstItem > range.getFirst() && firstItem <= range.getLast()) {
for (int i = firstItem - 1; i >= range.getFirst(); i--) {
if (!addViewItem(i, true)) {
break;
}
firstItem = i;
}
} else {
firstItem = range.getFirst();
}
int first = firstItem;
for (int i = itemsLayout.getChildCount(); i < range.getCount(); i++) {
if (!addViewItem(firstItem + i, false) && itemsLayout.getChildCount() == 0) {
first++;
}
}
firstItem = first;
return updated;
}