// License: GPL. For details, see LICENSE file.
package org.openstreetmap.josm.gui.widgets;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import javax.swing.DefaultComboBoxModel;
import org.openstreetmap.josm.gui.tagging.ac.AutoCompletionListItem;
public class ComboBoxHistory extends DefaultComboBoxModel<AutoCompletionListItem> implements Iterable<AutoCompletionListItem> {
private int maxSize = 10;
private List<HistoryChangedListener> listeners = new ArrayList<>();
public ComboBoxHistory(int size) {
maxSize = size;
}
public void addElement(String s) {
addElement(new AutoCompletionListItem(s));
}
/**
* Adds or moves an element to the top of the history
*/
@Override
public void addElement(AutoCompletionListItem o) {
String newEntry = o.getValue();
// if history contains this object already, delete it,
// so that it looks like a move to the top
for (int i = 0; i < getSize(); i++) {
String oldEntry = getElementAt(i).getValue();
if(oldEntry.equals(newEntry)) {
removeElementAt(i);
}
}
// insert element at the top
insertElementAt(o, 0);
// remove an element, if the history gets too large
if(getSize()> maxSize) {
removeElementAt(getSize()-1);
}
// set selected item to the one just added
setSelectedItem(o);
fireHistoryChanged();
}
@Override
public Iterator<AutoCompletionListItem> iterator() {
return new Iterator<AutoCompletionListItem>() {
private int position = -1;
@Override
public void remove() {
removeElementAt(position);
}
@Override
public boolean hasNext() {
if(position < getSize()-1 && getSize()>0)
return true;
return false;
}
@Override
public AutoCompletionListItem next() {
position++;
return getElementAt(position);
}
};
}
public void setItemsAsString(List<String> items) {
removeAllElements();
for (int i = items.size()-1; i>=0; i--) {
addElement(new AutoCompletionListItem(items.get(i)));
}
}
public List<String> asStringList() {
List<String> list = new ArrayList<>(maxSize);
for (AutoCompletionListItem item : this) {
list.add(item.getValue());
}
return list;
}
public void addHistoryChangedListener(HistoryChangedListener l) {
listeners.add(l);
}
public void removeHistoryChangedListener(HistoryChangedListener l) {
listeners.remove(l);
}
private void fireHistoryChanged() {
for (HistoryChangedListener l : listeners) {
l.historyChanged(asStringList());
}
}
}