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| import java.awt.event.FocusEvent;
import java.awt.event.FocusListener;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Collections;
import java.util.List;
import java.util.function.BiPredicate;
import java.util.function.Function;
import java.util.stream.Collectors;
import javax.swing.ComboBoxEditor;
import javax.swing.JComboBox;
import javax.swing.SwingUtilities;
import javax.swing.event.DocumentEvent;
import javax.swing.event.DocumentListener;
import javax.swing.text.AbstractDocument;
import javax.swing.text.JTextComponent;
import org.w3c.dom.Element;
public class AutoCompleteDecorator {
public static <T> void decorate(JComboBox<T> combo, boolean emptyByDefault, Collection<T> items) {
decorate(combo, emptyByDefault, items, (i,t)->i==null?false:i.toString().toUpperCase().startsWith(t.toUpperCase()), null);
}
public static <T> void decorate(JComboBox<T> combo, boolean emptyByDefault, Collection<T> items, BiPredicate<T,String> filter) {
decorate(combo, emptyByDefault, items, filter, null);
}
public static <T> void decorate(JComboBox<T> combo, boolean emptyByDefault, Collection<T> items, BiPredicate<T,String> filter, Function<T,String> toStringFunction) {
if ( combo==null ) throw new NullPointerException();
ComboBoxEditor editor = combo.getEditor();
if ( !(editor.getEditorComponent() instanceof JTextComponent) ) {
throw new IllegalArgumentException();
}
JTextComponent component = (JTextComponent) editor.getEditorComponent();
boolean strict = !combo.isEditable();
component.setEditable(true);
if ( !(component.getDocument() instanceof AbstractDocument) ) {
throw new IllegalArgumentException();
}
AbstractDocument document = (AbstractDocument) component.getDocument();
undecorate(combo);
AutoCompleteDecorator.Decorator<T> decorator = new AutoCompleteDecorator.Decorator<>(combo, strict, emptyByDefault, items, filter, toStringFunction, component, document);
combo.putClientProperty(KEY, decorator);
}
public static <T> void undecorate(JComboBox<T> combo) {
Object decorator = combo.getClientProperty(KEY);
if ( decorator instanceof AutoCompleteDecorator.Decorator ) {
((AutoCompleteDecorator.Decorator<?>)decorator).undecorate();
combo.putClientProperty(KEY, null);
}
}
private static final Object KEY = AutoCompleteDecorator.class.getName();
private static class Decorator<T> implements FocusListener, DocumentListener {
private final boolean strict;
private final JTextComponent component;
private final AbstractDocument document;
private final JComboBox<T> combo;
private final BiPredicate<T, String> filter;
private final List<T> data;
private final boolean emptyByDefault;
private final Function<T, String> toStringFunction;
private boolean reset;
private Decorator(JComboBox<T> combo, boolean strict, boolean emptyByDefault, Collection<T> items, BiPredicate<T, String> filter, Function<T,String> toStringFunction, JTextComponent component,
AbstractDocument document) {
this.combo=combo;
this.strict=strict;
this.emptyByDefault=emptyByDefault;
this.component=component;
this.document=document;
this.filter=filter;
this.toStringFunction = toStringFunction==null?String::valueOf:toStringFunction;
combo.setEditable(true);
component.addFocusListener(this);
document.addDocumentListener(this);
this.data = items==null?Collections.<T>emptyList():new ArrayList<T>(items);
filterCombo("",0);
}
public boolean isStrict() {
return strict;
}
public void undecorate() {
if ( isStrict() ) {
combo.setEditable(false);
}
component.removeFocusListener(this);
document.removeDocumentListener(this);
combo.removeAllItems();
data.forEach(combo::addItem);
}
public void filterCombo(String text, int offset) {
reset=true;
try {
combo.setEditable(false);
combo.removeAllItems();
List<T> filtered;
if ( !text.isEmpty() ) {
filtered = data.stream().filter(i-> filter.test(i, text)).collect(Collectors.toList());
}
else if ( !emptyByDefault ) {
filtered = data;
}
else {
filtered = Collections.emptyList();
}
filtered.forEach(combo::addItem);
combo.setEditable(true);
if ( strict ) {
if ( filtered.isEmpty() ) {
combo.setSelectedItem(text);
}
else if ( filtered.size()==1 ) {
combo.setSelectedItem(filtered.stream().iterator().next());
component.setSelectionStart(0);
component.setSelectionEnd(component.getText().length());
}
else {
combo.setSelectedItem(filtered.stream().iterator().next());
if ( offset!=component.getText().length() ) {
component.setCaretPosition(offset);
component.setSelectionStart(offset);
component.setSelectionEnd(component.getText().length());
}
else {
component.setSelectionStart(0);
component.setSelectionEnd(component.getText().length());
}
}
}
else {
combo.setSelectedItem(text);
}
}
finally {
reset=false;
}
}
@Override
public void focusGained(FocusEvent e) {
if ( !component.getText().isEmpty() || combo.getEditor().getEditorComponent().hasFocus() ){
combo.setPopupVisible(true);
}
}
@Override
public void focusLost(FocusEvent e) {
}
@Override
public void insertUpdate(DocumentEvent e) {
update();
}
@Override
public void removeUpdate(DocumentEvent e) {
update();
}
@Override
public void changedUpdate(DocumentEvent e) {
update();
}
private void update() {
if ( reset ) return;
String text = component.getText();
SwingUtilities.invokeLater(()-> {
filterCombo(text, component.getCaretPosition());
if ( combo.isShowing() ) {
combo.setPopupVisible(true);
}
});
}
}
} |
