javafx.scene.control.cell.ComboBoxListCell Maven / Gradle / Ivy
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* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
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*
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package javafx.scene.control.cell;
import static javafx.scene.control.cell.CellUtils.createComboBox;
import javafx.beans.property.BooleanProperty;
import javafx.beans.property.ObjectProperty;
import javafx.beans.property.SimpleBooleanProperty;
import javafx.beans.property.SimpleObjectProperty;
import javafx.collections.FXCollections;
import javafx.collections.ObservableList;
import javafx.scene.control.*;
import javafx.util.Callback;
import javafx.util.StringConverter;
/**
* A class containing a {@link ListCell} implementation that draws a
* {@link ComboBox} node inside the cell.
*
* By default, the ComboBoxListCell is rendered as a {@link Label} when not
* being edited, and as a ComboBox when in editing mode. The ComboBox will, by
* default, stretch to fill the entire list cell.
*
*
To create a ComboBoxListCell, it is necessary to provide zero or more
* items that will be shown to the user when the {@link ComboBox} menu is
* showing. These items must be of the same type as the ListView items sequence,
* such that upon selection, they replace the existing value in the
* {@link ListView#itemsProperty() items} list.
*
* @param The type of the elements contained within the ListView.
* @since JavaFX 2.2
*/
public class ComboBoxListCell extends ListCell {
/* *************************************************************************
* *
* Static cell factories *
* *
**************************************************************************/
/**
* Creates a ComboBox cell factory for use in {@link ListView} controls. By
* default, the ComboBoxCell is rendered as a {@link Label} when not being
* edited, and as a ComboBox when in editing mode. The ComboBox will, by
* default, stretch to fill the entire list cell.
*
* @param The type of the elements contained within the ListView.
* @param items Zero or more items that will be shown to the user when the
* {@link ComboBox} menu is showing. These items must be of the same
* type as the ListView items list, such that upon selection, they
* replace the existing value in the
* {@link ListView#itemsProperty() items} list.
* @return A {@link Callback} that will return a ListCell that is able to
* work on the type of element contained within the ListView.
*/
@SafeVarargs
public static Callback, ListCell> forListView(final T... items) {
return forListView(FXCollections.observableArrayList(items));
}
/**
* Creates a ComboBox cell factory for use in {@link ListView} controls. By
* default, the ComboBoxCell is rendered as a {@link Label} when not being
* edited, and as a ComboBox when in editing mode. The ComboBox will, by
* default, stretch to fill the entire list cell.
*
* @param The type of the elements contained within the ListView.
* @param converter A {@link StringConverter} to convert the given item (of
* type T) to a String for displaying to the user.
* @param items Zero or more items that will be shown to the user when the
* {@link ComboBox} menu is showing. These items must be of the same
* type as the ListView items list, such that
* upon selection, they replace the existing value in the
* {@link ListView#itemsProperty() items} list.
* @return A {@link Callback} that will return a ListCell that is able to
* work on the type of element contained within the ListView.
*/
@SafeVarargs
public static Callback, ListCell> forListView(
final StringConverter converter,
final T... items) {
return forListView(converter, FXCollections.observableArrayList(items));
}
/**
* Creates a ComboBox cell factory for use in {@link ListView} controls. By
* default, the ComboBoxCell is rendered as a {@link Label} when not being
* edited, and as a ComboBox when in editing mode. The ComboBox will, by
* default, stretch to fill the entire list cell.
*
* @param The type of the elements contained within the ListView.
* @param items An {@link ObservableList} containing zero or more items that
* will be shown to the user when the {@link ComboBox} menu is showing.
* These items must be of the same type as the ListView items sequence,
* such that upon selection, they replace the existing value in the
* {@link ListView#itemsProperty() items} list.
* @return A {@link Callback} that will return a ListCell that is able to
* work on the type of element contained within the ListView.
*/
public static Callback, ListCell> forListView(
final ObservableList items) {
return forListView(null, items);
}
/**
* Creates a ComboBox cell factory for use in {@link ListView} controls. By
* default, the ComboBoxCell is rendered as a {@link Label} when not being
* edited, and as a ComboBox when in editing mode. The ComboBox will, by
* default, stretch to fill the entire list cell.
*
* @param The type of the elements contained within the ListView.
* @param converter A {@link StringConverter} to convert the given item (of
* type T) to a String for displaying to the user.
* @param items An {@link ObservableList} containing zero or more items that
* will be shown to the user when the {@link ComboBox} menu is showing.
* These items must be of the same type as the ListView items sequence,
* such that upon selection, they replace the existing value in the
* {@link ListView#itemsProperty() items} list.
* @return A {@link Callback} that will return a ListCell that is able to
* work on the type of element contained within the ListView.
*/
public static Callback, ListCell> forListView(
final StringConverter converter,
final ObservableList items) {
return list -> new ComboBoxListCell(converter, items);
}
/* *************************************************************************
* *
* Fields *
* *
**************************************************************************/
private final ObservableList items;
private ComboBox comboBox;
/* *************************************************************************
* *
* Constructors *
* *
**************************************************************************/
/**
* Creates a default ComboBoxListCell with an empty items list.
*/
public ComboBoxListCell() {
this(FXCollections.observableArrayList());
}
/**
* Creates a default {@link ComboBoxListCell} instance with the given items
* being used to populate the {@link ComboBox} when it is shown.
*
* @param items The items to show in the ComboBox popup menu when selected
* by the user.
*/
@SafeVarargs
public ComboBoxListCell(T... items) {
this(FXCollections.observableArrayList(items));
}
/**
* Creates a {@link ComboBoxListCell} instance with the given items
* being used to populate the {@link ComboBox} when it is shown, and the
* {@link StringConverter} being used to convert the item in to a
* user-readable form.
*
* @param converter A {@link StringConverter} that can convert an item of
* type T into a user-readable string so that it may then be shown in
* the ComboBox popup menu.
* @param items The items to show in the ComboBox popup menu when selected
* by the user.
*/
@SafeVarargs
public ComboBoxListCell(StringConverter converter, T... items) {
this(converter, FXCollections.observableArrayList(items));
}
/**
* Creates a default {@link ComboBoxListCell} instance with the given items
* being used to populate the {@link ComboBox} when it is shown.
*
* @param items The items to show in the ComboBox popup menu when selected
* by the user.
*/
public ComboBoxListCell(ObservableList items) {
this(null, items);
}
/**
* Creates a {@link ComboBoxListCell} instance with the given items
* being used to populate the {@link ComboBox} when it is shown, and the
* {@link StringConverter} being used to convert the item in to a
* user-readable form.
*
* @param converter A {@link StringConverter} that can convert an item of
* type T into a user-readable string so that it may then be shown in
* the ComboBox popup menu.
* @param items The items to show in the ComboBox popup menu when selected
* by the user.
*/
public ComboBoxListCell(StringConverter converter, ObservableList items) {
this.getStyleClass().add("combo-box-list-cell");
this.items = items;
setConverter(converter != null ? converter : CellUtils.defaultStringConverter());
}
/* *************************************************************************
* *
* Properties *
* *
**************************************************************************/
// --- converter
private ObjectProperty> converter =
new SimpleObjectProperty>(this, "converter");
/**
* The {@link StringConverter} property.
* @return the {@link StringConverter} property
*/
public final ObjectProperty> converterProperty() {
return converter;
}
/**
* Sets the {@link StringConverter} to be used in this cell.
* @param value the {@link StringConverter} to be used in this cell
*/
public final void setConverter(StringConverter value) {
converterProperty().set(value);
}
/**
* Returns the {@link StringConverter} used in this cell.
* @return the {@link StringConverter} used in this cell
*/
public final StringConverter getConverter() {
return converterProperty().get();
}
// --- comboBox editable
private BooleanProperty comboBoxEditable =
new SimpleBooleanProperty(this, "comboBoxEditable");
/**
* A property representing whether the ComboBox, when shown to the user,
* is editable or not.
* @return the property representing whether the ComboBox, when shown to
* the user, is editable or not
*/
public final BooleanProperty comboBoxEditableProperty() {
return comboBoxEditable;
}
/**
* Configures the ComboBox to be editable (to allow user input outside of the
* options provide in the dropdown list).
* @param value the editable value for this ComboBox
*/
public final void setComboBoxEditable(boolean value) {
comboBoxEditableProperty().set(value);
}
/**
* Returns true if the ComboBox is editable.
* @return true if the ComboBox is editable
*/
public final boolean isComboBoxEditable() {
return comboBoxEditableProperty().get();
}
/* *************************************************************************
* *
* Public API *
* *
**************************************************************************/
/**
* Returns the items to be displayed in the ChoiceBox when it is showing.
* @return the items to be displayed in the ChoiceBox when it is showing
*/
public ObservableList getItems() {
return items;
}
/** {@inheritDoc} */
@Override public void startEdit() {
if (! isEditable() || ! getListView().isEditable()) {
return;
}
if (comboBox == null) {
comboBox = createComboBox(this, items, converterProperty());
comboBox.editableProperty().bind(comboBoxEditableProperty());
}
comboBox.getSelectionModel().select(getItem());
super.startEdit();
if (isEditing()) {
setText(null);
setGraphic(comboBox);
}
}
/** {@inheritDoc} */
@Override public void cancelEdit() {
super.cancelEdit();
setText(getConverter().toString(getItem()));
setGraphic(null);
}
/** {@inheritDoc} */
@Override public void updateItem(T item, boolean empty) {
super.updateItem(item, empty);
CellUtils.updateItem(this, getConverter(), null, null, comboBox);
}
}