public class AutoCompleteComboBoxListener implements EventHandler<KeyEvent> {
private ComboBox comboBox;
private StringBuilder sb;
private int lastLength;
public AutoCompleteComboBoxListener(ComboBox comboBox) {
this.comboBox = comboBox;
sb = new StringBuilder();
this.comboBox.setEditable(true);
this.comboBox.setOnKeyReleased(AutoCompleteComboBoxListener.this);
// add a focus listener such that if not in focus, reset the filtered typed keys
this.comboBox.getEditor().focusedProperty().addListener(new ChangeListener<Boolean>() {
@Override
public void changed(ObservableValue observable, Boolean oldValue, Boolean newValue) {
if (newValue) {
// in focus
}
else {
lastLength = 0;
sb.delete(0, sb.length());
selectClosestResultBasedOnTextFieldValue(false, false);
}
}
});
this.comboBox.setOnMouseClicked(new EventHandler<MouseEvent>() {
@Override
public void handle(MouseEvent event) {
selectClosestResultBasedOnTextFieldValue(true, true);
}
});
}
@Override
public void handle(KeyEvent event) {
// this variable is used to bypass the auto complete process if the length is the same.
// this occurs if user types fast, the length of textfield will record after the user
// has typed after a certain delay.
if (lastLength != (comboBox.getEditor().getLength() - comboBox.getEditor().getSelectedText().length()))
lastLength = comboBox.getEditor().getLength() - comboBox.getEditor().getSelectedText().length();
if (event.isControlDown() || event.getCode() == KeyCode.BACK_SPACE ||
event.getCode() == KeyCode.RIGHT || event.getCode() == KeyCode.LEFT ||
event.getCode() == KeyCode.DELETE || event.getCode() == KeyCode.HOME ||
event.getCode() == KeyCode.END || event.getCode() == KeyCode.TAB
)
return;
IndexRange ir = comboBox.getEditor().getSelection();
sb.delete(0, sb.length());
sb.append(comboBox.getEditor().getText());
// remove selected string index until end so only unselected text will be recorded
try {
sb.delete(ir.getStart(), sb.length());
} catch (Exception e) { }
ObservableList items = comboBox.getItems();
for (int i=0; i<items.size(); i++) {
if (items.get(i).toString().toLowerCase().startsWith(comboBox.getEditor().getText().toLowerCase())
)
{
try {
comboBox.getEditor().setText(sb.toString() + items.get(i).toString().substring(sb.toString().length()));
} catch (Exception e) {
comboBox.getEditor().setText(sb.toString());
}
comboBox.getEditor().positionCaret(sb.toString().length());
comboBox.getEditor().selectEnd();
break;
}
}
}
/*
* selectClosestResultBasedOnTextFieldValue() - selects the item and scrolls to it when
* the popup is shown.
*
* parameters:
* affect - true if combobox is clicked to show popup so text and caret position will be readjusted.
* inFocus - true if combobox has focus. If not, programmatically press enter key to add new entry to list.
*
*/
private void selectClosestResultBasedOnTextFieldValue(boolean affect, boolean inFocus) {
ObservableList items = AutoCompleteComboBoxListener.this.comboBox.getItems();
boolean found = false;
for (int i=0; i<items.size(); i++) {
if (AutoCompleteComboBoxListener.this.comboBox.getEditor().getText().toLowerCase().equals(items.get(i).toString().toLowerCase())) {
try {
ListView lv = ((ComboBoxListViewSkin) AutoCompleteComboBoxListener.this.comboBox.getSkin()).getListView();
lv.getSelectionModel().clearAndSelect(i);
lv.scrollTo(lv.getSelectionModel().getSelectedIndex());
found = true;
break;
} catch (Exception e) { }
}
}
String s = comboBox.getEditor().getText();
if (!found && affect) {
comboBox.getSelectionModel().clearSelection();
comboBox.getEditor().setText(s);
comboBox.getEditor().end();
}
if (!inFocus && comboBox.getEditor().getText() != null && comboBox.getEditor().getText().trim().length() > 0) {
// press enter key programmatically to have this entry added
KeyEvent ke = KeyEvent.impl_keyEvent(comboBox, KeyCode.ENTER.toString(), KeyCode.ENTER.getName(), KeyCode.ENTER.impl_getCode(), false, false, false, false, KeyEvent.KEY_RELEASED);
comboBox.fireEvent(ke);
}
}
}
