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| /**
* A sorted model for combo boxes, from the oracle jdk 1.7 code .
*
* @param <E> the type of the elements of this model
*
*/
public class SortedComboBoxModel<E> extends AbstractListModel<E> implements MutableComboBoxModel<E>, Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
Vector<E> objects;
Object selectedObject;
private Comparator<? super E> comparator;
/**
* Constructs an empty DefaultComboBoxModel object.
*/
public SortedComboBoxModel() {
objects = new Vector<E>();
}
/**
* Constructs a DefaultComboBoxModel object initialized with
* an array of objects.
*
* @param items an array of Object objects
*/
public SortedComboBoxModel(final E items[]) {
objects = new Vector<E>(items.length);
int i,c;
for ( i=0,c=items.length;i<c;i++ )
objects.addElement(items[i]);
if ( getSize() > 0 ) {
selectedObject = getElementAt( 0 );
}
}
/**
* Constructs a DefaultComboBoxModel object initialized with
* a vector.
*
* @param v a Vector object ...
*/
public SortedComboBoxModel(Vector<E> v) {
objects = v;
if ( getSize() > 0 ) {
selectedObject = getElementAt( 0 );
}
}
/**
* Constructs an empty DefaultComboBoxModel object.
*/
public SortedComboBoxModel(Comparator<? super E> comparator) {
this.comparator=comparator;
objects = new Vector<E>();
}
/**
* Constructs a DefaultComboBoxModel object initialized with
* an array of objects.
*
* @param items an array of Object objects
*/
public SortedComboBoxModel(final E items[], Comparator<? super E> comparator) {
this.comparator=comparator;
objects = new Vector<E>(items.length);
int i,c;
for ( i=0,c=items.length;i<c;i++ )
objects.addElement(items[i]);
if ( comparator!=null ) {
Collections.sort(objects, comparator);
}
if ( getSize() > 0 ) {
selectedObject = getElementAt( 0 );
}
}
/**
* Constructs a DefaultComboBoxModel object initialized with
* a vector.
*
* @param v a Vector object ...
*/
public SortedComboBoxModel(Vector<E> v, Comparator<? super E> comparator) {
this.comparator=comparator;
objects = v;
if ( comparator!=null ) {
Collections.sort(objects, comparator);
}
if ( getSize() > 0 ) {
selectedObject = getElementAt( 0 );
}
}
// implements javax.swing.ComboBoxModel
/**
* Set the value of the selected item. The selected item may be null.
* <p>
* @param anObject The combo box value or null for no selection.
*/
public void setSelectedItem(Object anObject) {
if ((selectedObject != null && !selectedObject.equals( anObject )) ||
selectedObject == null && anObject != null) {
selectedObject = anObject;
fireContentsChanged(this, -1, -1);
}
}
// implements javax.swing.ComboBoxModel
public Object getSelectedItem() {
return selectedObject;
}
// implements javax.swing.ListModel
public int getSize() {
return objects.size();
}
// implements javax.swing.ListModel
public E getElementAt(int index) {
if ( index >= 0 && index < objects.size() )
return objects.elementAt(index);
else
return null;
}
/**
* Returns the index-position of the specified object in the list.
*
* @param anObject
* @return an int representing the index position, where 0 is
* the first position
*/
public int getIndexOf(Object anObject) {
return objects.indexOf(anObject);
}
// implements javax.swing.MutableComboBoxModel
public void addElement(E anObject) {
if ( comparator!=null ) {
int index = insertSortedElement(anObject);
if ( objects.size() == 1 && selectedObject == null && anObject != null ) {
setSelectedItem( anObject );
}
}
else {
objects.addElement(anObject);
fireIntervalAdded(this,objects.size()-1, objects.size()-1);
if ( objects.size() == 1 && selectedObject == null && anObject != null ) {
setSelectedItem( anObject );
}
}
}
private int insertSortedElement(E anObject) {
int size = getSize();
int index;
for (index = 0; index < size; index++) {
E o = getElementAt( index );
if (comparator.compare(o, anObject) > 0) {
break;
}
}
objects.add(index, anObject);
fireIntervalAdded(this, index, index);
return index;
}
// implements javax.swing.MutableComboBoxModel
public void insertElementAt(E anObject,int index) {
if ( comparator!=null ) {
insertSortedElement(anObject);
}
else {
objects.insertElementAt(anObject,index);
fireIntervalAdded(this, index, index);
}
}
// implements javax.swing.MutableComboBoxModel
public void removeElementAt(int index) {
if ( getElementAt( index ) == selectedObject ) {
if ( index == 0 ) {
setSelectedItem( getSize() == 1 ? null : getElementAt( index + 1 ) );
}
else {
setSelectedItem( getElementAt( index - 1 ) );
}
}
objects.removeElementAt(index);
fireIntervalRemoved(this, index, index);
}
// implements javax.swing.MutableComboBoxModel
public void removeElement(Object anObject) {
int index = objects.indexOf(anObject);
if ( index != -1 ) {
removeElementAt(index);
}
}
/**
* Empties the list.
*/
public void removeAllElements() {
if ( objects.size() > 0 ) {
int firstIndex = 0;
int lastIndex = objects.size() - 1;
objects.removeAllElements();
selectedObject = null;
fireIntervalRemoved(this, firstIndex, lastIndex);
} else {
selectedObject = null;
}
}
} |
