public boolean fillInCommonPrefix(boolean explicitlyInvoked) {
if (explicitlyInvoked) {
setFocusDegree(FocusDegree.FOCUSED);
}
if (explicitlyInvoked && myCalculating) return false;
if (!explicitlyInvoked && mySelectionTouched) return false;
ListModel listModel = getListModel();
if (listModel.getSize() <= 1) return false;
if (listModel.getSize() == 0) return false;
final LookupElement firstItem = (LookupElement) listModel.getElementAt(0);
if (listModel.getSize() == 1 && firstItem instanceof EmptyLookupItem) return false;
final PrefixMatcher firstItemMatcher = itemMatcher(firstItem);
final String oldPrefix = firstItemMatcher.getPrefix();
final String presentPrefix = oldPrefix + getAdditionalPrefix();
String commonPrefix = getCaseCorrectedLookupString(firstItem);
for (int i = 1; i < listModel.getSize(); i++) {
LookupElement item = (LookupElement) listModel.getElementAt(i);
if (item instanceof EmptyLookupItem) return false;
if (!oldPrefix.equals(itemMatcher(item).getPrefix())) return false;
final String lookupString = getCaseCorrectedLookupString(item);
final int length = Math.min(commonPrefix.length(), lookupString.length());
if (length < commonPrefix.length()) {
commonPrefix = commonPrefix.substring(0, length);
}
for (int j = 0; j < length; j++) {
if (commonPrefix.charAt(j) != lookupString.charAt(j)) {
commonPrefix = lookupString.substring(0, j);
break;
}
}
if (commonPrefix.length() == 0 || commonPrefix.length() < presentPrefix.length()) {
return false;
}
}
if (commonPrefix.equals(presentPrefix)) {
return false;
}
for (int i = 0; i < listModel.getSize(); i++) {
LookupElement item = (LookupElement) listModel.getElementAt(i);
if (!itemMatcher(item).cloneWithPrefix(commonPrefix).prefixMatches(item)) {
return false;
}
}
myOffsets.setInitialPrefix(presentPrefix, explicitlyInvoked);
replacePrefix(presentPrefix, commonPrefix);
return true;
}
private void updateListHeight(ListModel model) {
myList.setFixedCellHeight(
myCellRenderer
.getListCellRendererComponent(myList, model.getElementAt(0), 0, false, false)
.getPreferredSize()
.height);
myList.setVisibleRowCount(
Math.min(model.getSize(), UISettings.getInstance().MAX_LOOKUP_LIST_HEIGHT));
}