Module javafx.controls

Package javafx.scene.control.cell

Class ComboBoxTreeTableCell<S,T>

java.lang.Object

javafx.scene.Node

javafx.scene.Parent

javafx.scene.layout.Region

javafx.scene.control.Control

javafx.scene.control.Labeled

javafx.scene.control.Cell<T>

javafx.scene.control.IndexedCell<T>

javafx.scene.control.TreeTableCell<S,T>

javafx.scene.control.cell.ComboBoxTreeTableCell<S,T>

Type Parameters:

S - The type of the TreeTableView generic type

T - The type of the elements contained within the TreeTableColumn.

All Implemented Interfaces:

Styleable, EventTarget, Skinnable

public class ComboBoxTreeTableCell<S,T>
extends TreeTableCell<S,T>

A class containing a TreeTableCell implementation that draws a ComboBox node inside the cell.

By default, the ComboBoxTreeTableCell is rendered as a Label when not being edited, and as a ComboBox when in editing mode. The ComboBox will, by default, stretch to fill the entire table cell.

To create a ComboBoxTreeTableCell, it is necessary to provide zero or more items that will be shown to the user when the ComboBox menu is showing. These items must be of the same type as the TreeTableColumn.

Since:

JavaFX 8.0

Property Summary

Properties

Type	Property	Description
final BooleanProperty	comboBoxEditable	A property representing whether the ComboBox, when shown to the user, is editable or not.
final ObjectProperty<StringConverter<T>>	converter	The StringConverter property.

Properties declared in class javafx.scene.control.TreeTableCell

tableColumn, tableRow, treeTableView

Properties declared in class javafx.scene.control.IndexedCell

index

Properties declared in class javafx.scene.control.Cell

editable, editing, empty, item, selected

Properties declared in class javafx.scene.control.Labeled

alignment, contentDisplay, ellipsisString, font, graphic, graphicTextGap, labelPadding, lineSpacing, mnemonicParsing, textAlignment, textFill, textOverrun, text, textTruncated, underline, wrapText

Properties declared in class javafx.scene.control.Control

contextMenu, skin, tooltip

Properties declared in class javafx.scene.layout.Region

background, border, cacheShape, centerShape, height, insets, maxHeight, maxWidth, minHeight, minWidth, opaqueInsets, padding, prefHeight, prefWidth, scaleShape, shape, snapToPixel, width

Properties declared in class javafx.scene.Parent

needsLayout

Properties declared in class javafx.scene.Node

accessibleHelp, accessibleRoleDescription, accessibleRole, accessibleText, blendMode, boundsInLocal, boundsInParent, cacheHint, cache, clip, cursor, depthTest, disabled, disable, effectiveNodeOrientation, effect, eventDispatcher, focused, focusTraversable, focusVisible, focusWithin, hover, id, inputMethodRequests, layoutBounds, layoutX, layoutY, localToParentTransform, localToSceneTransform, managed, mouseTransparent, nodeOrientation, onContextMenuRequested, onDragDetected, onDragDone, onDragDropped, onDragEntered, onDragExited, onDragOver, onInputMethodTextChanged, onKeyPressed, onKeyReleased, onKeyTyped, onMouseClicked, onMouseDragEntered, onMouseDragExited, onMouseDragged, onMouseDragOver, onMouseDragReleased, onMouseEntered, onMouseExited, onMouseMoved, onMousePressed, onMouseReleased, onRotate, onRotationFinished, onRotationStarted, onScrollFinished, onScroll, onScrollStarted, onSwipeDown, onSwipeLeft, onSwipeRight, onSwipeUp, onTouchMoved, onTouchPressed, onTouchReleased, onTouchStationary, onZoomFinished, onZoom, onZoomStarted, opacity, parent, pickOnBounds, pressed, rotate, rotationAxis, scaleX, scaleY, scaleZ, scene, style, translateX, translateY, translateZ, viewOrder, visible

Field Summary

Fields declared in class javafx.scene.layout.Region

USE_COMPUTED_SIZE, USE_PREF_SIZE

Fields declared in class javafx.scene.Node

BASELINE_OFFSET_SAME_AS_HEIGHT

Constructor Summary

Constructors

Constructor	Description
ComboBoxTreeTableCell()	Creates a default ComboBoxTreeTableCell with an empty items list.
ComboBoxTreeTableCell(ObservableList<T> items)	Creates a default ComboBoxTreeTableCell instance with the given items being used to populate the ComboBox when it is shown.
ComboBoxTreeTableCell(StringConverter<T> converter, ObservableList<T> items)	Creates a ComboBoxTreeTableCell instance with the given items being used to populate the ComboBox when it is shown, and the StringConverter being used to convert the item in to a user-readable form.
ComboBoxTreeTableCell(StringConverter<T> converter, T... items)	Creates a ComboBoxTreeTableCell instance with the given items being used to populate the ComboBox when it is shown, and the StringConverter being used to convert the item in to a user-readable form.
ComboBoxTreeTableCell(T... items)	Creates a default ComboBoxTreeTableCell instance with the given items being used to populate the ComboBox when it is shown.

Method Summary

Modifier and Type	Method	Description
final BooleanProperty	comboBoxEditableProperty()	A property representing whether the ComboBox, when shown to the user, is editable or not.
final ObjectProperty<StringConverter<T>>	converterProperty()	The StringConverter property.
static <S, T> Callback<TreeTableColumn<S,T>,TreeTableCell<S,T>>	forTreeTableColumn(ObservableList<T> items)	Creates a ComboBox cell factory for use in TreeTableColumn controls.
static <S, T> Callback<TreeTableColumn<S,T>,TreeTableCell<S,T>>	forTreeTableColumn(StringConverter<T> converter, ObservableList<T> items)	Creates a ComboBox cell factory for use in TreeTableColumn controls.
static <S, T> Callback<TreeTableColumn<S,T>,TreeTableCell<S,T>>	forTreeTableColumn(StringConverter<T> converter, T... items)	Creates a ComboBox cell factory for use in TreeTableColumn controls.
static <S, T> Callback<TreeTableColumn<S,T>,TreeTableCell<S,T>>	forTreeTableColumn(T... items)	Creates a ComboBox cell factory for use in TreeTableColumn controls.
final StringConverter<T>	getConverter()	Returns the StringConverter used in this cell.
ObservableList<T>	getItems()	Returns the items to be displayed in the ComboBox when it is showing.
final boolean	isComboBoxEditable()	Returns true if the ComboBox is editable.
final void	setComboBoxEditable(boolean value)	Configures the ComboBox to be editable (to allow user input outside of the options provide in the dropdown list).
final void	setConverter(StringConverter<T> value)	Sets the StringConverter to be used in this cell.
void	updateItem(T item, boolean empty)	The updateItem method should not be called by developers, but it is the best method for developers to override to allow for them to customise the visuals of the cell.

Methods declared in class javafx.scene.control.TreeTableCell

getTableColumn, getTableRow, getTreeTableRow, getTreeTableView, tableColumnProperty, tableRowProperty, treeTableViewProperty, updateTableColumn, updateTableRow, updateTreeTableColumn, updateTreeTableRow, updateTreeTableView

Methods declared in class javafx.scene.control.IndexedCell

getIndex, indexProperty, updateIndex

Methods declared in class javafx.scene.control.Cell

cancelEdit, commitEdit, editableProperty, editingProperty, emptyProperty, getInitialFocusTraversable, getItem, isEditable, isEditing, isEmpty, isItemChanged, isSelected, itemProperty, selectedProperty, setEditable, setItem, startEdit, updateSelected

Methods declared in class javafx.scene.control.Labeled

alignmentProperty, contentDisplayProperty, ellipsisStringProperty, fontProperty, getAlignment, getClassCssMetaData, getContentBias, getContentDisplay, getControlCssMetaData, getEllipsisString, getFont, getGraphic, getGraphicTextGap, getInitialAlignment, getLabelPadding, getLineSpacing, getText, getTextAlignment, getTextFill, getTextOverrun, graphicProperty, graphicTextGapProperty, isMnemonicParsing, isTextTruncated, isUnderline, isWrapText, labelPaddingProperty, lineSpacingProperty, mnemonicParsingProperty, setAlignment, setContentDisplay, setEllipsisString, setFont, setGraphic, setGraphicTextGap, setLineSpacing, setMnemonicParsing, setText, setTextAlignment, setTextFill, setTextOverrun, setUnderline, setWrapText, textAlignmentProperty, textFillProperty, textOverrunProperty, textProperty, textTruncatedProperty, underlineProperty, wrapTextProperty

Methods declared in class javafx.scene.control.Control

computeMaxHeight, computeMaxWidth, computeMinHeight, computeMinWidth, contextMenuProperty, createDefaultSkin, getContextMenu, getCssMetaData, getSkin, getTooltip, isResizable, setContextMenu, setSkin, setTooltip, skinProperty, tooltipProperty

Methods declared in class javafx.scene.layout.Region

backgroundProperty, borderProperty, cacheShapeProperty, centerShapeProperty, computePrefHeight, computePrefWidth, getBackground, getBorder, getHeight, getInsets, getMaxHeight, getMaxWidth, getMinHeight, getMinWidth, getOpaqueInsets, getPadding, getPrefHeight, getPrefWidth, getShape, getUserAgentStylesheet, getWidth, heightProperty, insetsProperty, isCacheShape, isCenterShape, isScaleShape, isSnapToPixel, layoutInArea, layoutInArea, layoutInArea, layoutInArea, maxHeight, maxHeightProperty, maxWidth, maxWidthProperty, minHeight, minHeightProperty, minWidth, minWidthProperty, opaqueInsetsProperty, paddingProperty, positionInArea, positionInArea, prefHeight, prefHeightProperty, prefWidth, prefWidthProperty, resize, scaleShapeProperty, setBackground, setBorder, setCacheShape, setCenterShape, setHeight, setMaxHeight, setMaxSize, setMaxWidth, setMinHeight, setMinSize, setMinWidth, setOpaqueInsets, setPadding, setPrefHeight, setPrefSize, setPrefWidth, setScaleShape, setShape, setSnapToPixel, setWidth, shapeProperty, snappedBottomInset, snappedLeftInset, snappedRightInset, snappedTopInset, snapPosition, snapPositionX, snapPositionY, snapSize, snapSizeX, snapSizeY, snapSpace, snapSpaceX, snapSpaceY, snapToPixelProperty, widthProperty

Methods declared in class javafx.scene.Parent

getBaselineOffset, getChildren, getChildrenUnmodifiable, getManagedChildren, getStylesheets, isNeedsLayout, layout, layoutChildren, needsLayoutProperty, requestLayout, requestParentLayout, setNeedsLayout, updateBounds

Methods declared in class javafx.scene.Node

accessibleHelpProperty, accessibleRoleDescriptionProperty, accessibleRoleProperty, accessibleTextProperty, addEventFilter, addEventHandler, applyCss, autosize, blendModeProperty, boundsInLocalProperty, boundsInParentProperty, buildEventDispatchChain, cacheHintProperty, cacheProperty, clipProperty, computeAreaInScreen, contains, contains, cursorProperty, depthTestProperty, disabledProperty, disableProperty, effectiveNodeOrientationProperty, effectProperty, eventDispatcherProperty, executeAccessibleAction, fireEvent, focusedProperty, focusTraversableProperty, focusVisibleProperty, focusWithinProperty, getAccessibleHelp, getAccessibleRole, getAccessibleRoleDescription, getAccessibleText, getBlendMode, getBoundsInLocal, getBoundsInParent, getCacheHint, getClip, getCursor, getDepthTest, getEffect, getEffectiveNodeOrientation, getEventDispatcher, getId, getInitialCursor, getInputMethodRequests, getLayoutBounds, getLayoutX, getLayoutY, getLocalToParentTransform, getLocalToSceneTransform, getNodeOrientation, getOnContextMenuRequested, getOnDragDetected, getOnDragDone, getOnDragDropped, getOnDragEntered, getOnDragExited, getOnDragOver, getOnInputMethodTextChanged, getOnKeyPressed, getOnKeyReleased, getOnKeyTyped, getOnMouseClicked, getOnMouseDragEntered, getOnMouseDragExited, getOnMouseDragged, getOnMouseDragOver, getOnMouseDragReleased, getOnMouseEntered, getOnMouseExited, getOnMouseMoved, getOnMousePressed, getOnMouseReleased, getOnRotate, getOnRotationFinished, getOnRotationStarted, getOnScroll, getOnScrollFinished, getOnScrollStarted, getOnSwipeDown, getOnSwipeLeft, getOnSwipeRight, getOnSwipeUp, getOnTouchMoved, getOnTouchPressed, getOnTouchReleased, getOnTouchStationary, getOnZoom, getOnZoomFinished, getOnZoomStarted, getOpacity, getParent, getProperties, getPseudoClassStates, getRotate, getRotationAxis, getScaleX, getScaleY, getScaleZ, getScene, getStyle, getStyleableParent, getStyleClass, getTransforms, getTranslateX, getTranslateY, getTranslateZ, getTypeSelector, getUserData, getViewOrder, hasProperties, hoverProperty, idProperty, inputMethodRequestsProperty, intersects, intersects, isCache, isDisable, isDisabled, isFocused, isFocusTraversable, isFocusVisible, isFocusWithin, isHover, isManaged, isMouseTransparent, isPickOnBounds, isPressed, isVisible, layoutBoundsProperty, layoutXProperty, layoutYProperty, localToParent, localToParent, localToParent, localToParent, localToParent, localToParentTransformProperty, localToScene, localToScene, localToScene, localToScene, localToScene, localToScene, localToScene, localToScene, localToScene, localToScene, localToSceneTransformProperty, localToScreen, localToScreen, localToScreen, localToScreen, localToScreen, lookup, lookupAll, managedProperty, mouseTransparentProperty, nodeOrientationProperty, notifyAccessibleAttributeChanged, onContextMenuRequestedProperty, onDragDetectedProperty, onDragDoneProperty, onDragDroppedProperty, onDragEnteredProperty, onDragExitedProperty, onDragOverProperty, onInputMethodTextChangedProperty, onKeyPressedProperty, onKeyReleasedProperty, onKeyTypedProperty, onMouseClickedProperty, onMouseDragEnteredProperty, onMouseDragExitedProperty, onMouseDraggedProperty, onMouseDragOverProperty, onMouseDragReleasedProperty, onMouseEnteredProperty, onMouseExitedProperty, onMouseMovedProperty, onMousePressedProperty, onMouseReleasedProperty, onRotateProperty, onRotationFinishedProperty, onRotationStartedProperty, onScrollFinishedProperty, onScrollProperty, onScrollStartedProperty, onSwipeDownProperty, onSwipeLeftProperty, onSwipeRightProperty, onSwipeUpProperty, onTouchMovedProperty, onTouchPressedProperty, onTouchReleasedProperty, onTouchStationaryProperty, onZoomFinishedProperty, onZoomProperty, onZoomStartedProperty, opacityProperty, parentProperty, parentToLocal, parentToLocal, parentToLocal, parentToLocal, parentToLocal, pickOnBoundsProperty, pressedProperty, pseudoClassStateChanged, queryAccessibleAttribute, relocate, removeEventFilter, removeEventHandler, requestFocus, resizeRelocate, rotateProperty, rotationAxisProperty, scaleXProperty, scaleYProperty, scaleZProperty, sceneProperty, sceneToLocal, sceneToLocal, sceneToLocal, sceneToLocal, sceneToLocal, sceneToLocal, sceneToLocal, sceneToLocal, screenToLocal, screenToLocal, screenToLocal, setAccessibleHelp, setAccessibleRole, setAccessibleRoleDescription, setAccessibleText, setBlendMode, setCache, setCacheHint, setClip, setCursor, setDepthTest, setDisable, setDisabled, setEffect, setEventDispatcher, setEventHandler, setFocused, setFocusTraversable, setHover, setId, setInputMethodRequests, setLayoutX, setLayoutY, setManaged, setMouseTransparent, setNodeOrientation, setOnContextMenuRequested, setOnDragDetected, setOnDragDone, setOnDragDropped, setOnDragEntered, setOnDragExited, setOnDragOver, setOnInputMethodTextChanged, setOnKeyPressed, setOnKeyReleased, setOnKeyTyped, setOnMouseClicked, setOnMouseDragEntered, setOnMouseDragExited, setOnMouseDragged, setOnMouseDragOver, setOnMouseDragReleased, setOnMouseEntered, setOnMouseExited, setOnMouseMoved, setOnMousePressed, setOnMouseReleased, setOnRotate, setOnRotationFinished, setOnRotationStarted, setOnScroll, setOnScrollFinished, setOnScrollStarted, setOnSwipeDown, setOnSwipeLeft, setOnSwipeRight, setOnSwipeUp, setOnTouchMoved, setOnTouchPressed, setOnTouchReleased, setOnTouchStationary, setOnZoom, setOnZoomFinished, setOnZoomStarted, setOpacity, setPickOnBounds, setPressed, setRotate, setRotationAxis, setScaleX, setScaleY, setScaleZ, setStyle, setTranslateX, setTranslateY, setTranslateZ, setUserData, setViewOrder, setVisible, snapshot, snapshot, startDragAndDrop, startFullDrag, styleProperty, toBack, toFront, toString, translateXProperty, translateYProperty, translateZProperty, usesMirroring, viewOrderProperty, visibleProperty

Methods declared in class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Methods declared in interface javafx.css.Styleable

getStyleableNode

Property Details

converter

public final ObjectProperty<StringConverter<T>> converterProperty

The StringConverter property.

See Also:

• getConverter()
• setConverter(StringConverter)
• converterProperty()

comboBoxEditable

public final BooleanProperty comboBoxEditableProperty

A property representing whether the ComboBox, when shown to the user, is editable or not.

See Also:

• isComboBoxEditable()
• setComboBoxEditable(boolean)
• comboBoxEditableProperty()

Constructor Details

ComboBoxTreeTableCell

public ComboBoxTreeTableCell()

Creates a default ComboBoxTreeTableCell with an empty items list.

ComboBoxTreeTableCell

@SafeVarargs
public ComboBoxTreeTableCell(T... items)

Creates a default ComboBoxTreeTableCell instance with the given items being used to populate the ComboBox when it is shown.

Parameters:

items - The items to show in the ComboBox popup menu when selected by the user.

ComboBoxTreeTableCell

@SafeVarargs
public ComboBoxTreeTableCell(StringConverter<T> converter,
 T... items)

Creates a ComboBoxTreeTableCell instance with the given items being used to populate the ComboBox when it is shown, and the StringConverter being used to convert the item in to a user-readable form.

Parameters:

converter - A 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.

items - The items to show in the ComboBox popup menu when selected by the user.

ComboBoxTreeTableCell

public ComboBoxTreeTableCell(ObservableList<T> items)

Creates a default ComboBoxTreeTableCell instance with the given items being used to populate the ComboBox when it is shown.

Parameters:

items - The items to show in the ComboBox popup menu when selected by the user.

ComboBoxTreeTableCell

public ComboBoxTreeTableCell(StringConverter<T> converter,
 ObservableList<T> items)

Creates a ComboBoxTreeTableCell instance with the given items being used to populate the ComboBox when it is shown, and the StringConverter being used to convert the item in to a user-readable form.

Parameters:

converter - A 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.

items - The items to show in the ComboBox popup menu when selected by the user.

Method Details

forTreeTableColumn

@SafeVarargs
public static <S,
T>
Callback<TreeTableColumn<S,T>,TreeTableCell<S,T>> forTreeTableColumn(T... items)

Creates a ComboBox cell factory for use in TreeTableColumn controls. By default, the ComboBoxCell is rendered as a 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.

Type Parameters:

S - The type of the TreeTableView generic type

T - The type of the elements contained within the TreeTableColumn.

Parameters:

items - Zero or more items that will be shown to the user when the ComboBox menu is showing. These items must be of the same type as the TreeTableColumn. Note that it is up to the developer to set event handlers to listen to edit events in the TreeTableColumn, and react accordingly. Methods of interest include setOnEditStart, setOnEditCommit, and setOnEditCancel.

Returns:

A Callback that will return a TreeTableCell that is able to work on the type of element contained within the TreeTableColumn.

forTreeTableColumn

@SafeVarargs
public static <S,
T>
Callback<TreeTableColumn<S,T>,TreeTableCell<S,T>> forTreeTableColumn(StringConverter<T> converter,
 T... items)

Creates a ComboBox cell factory for use in TreeTableColumn controls. By default, the ComboBoxCell is rendered as a 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.

Type Parameters:

S - The type of the TreeTableView generic type

T - The type of the elements contained within the TreeTableColumn.

Parameters:

converter - A StringConverter to convert the given item (of type T) to a String for displaying to the user.

items - Zero or more items that will be shown to the user when the ComboBox menu is showing. These items must be of the same type as the TreeTableColumn. Note that it is up to the developer to set event handlers to listen to edit events in the TreeTableColumn, and react accordingly. Methods of interest include setOnEditStart, setOnEditCommit, and setOnEditCancel.

Returns:

A Callback that will return a TreeTableCell that is able to work on the type of element contained within the TreeTableColumn.

forTreeTableColumn

public static <S,
T>
Callback<TreeTableColumn<S,T>,TreeTableCell<S,T>> forTreeTableColumn(ObservableList<T> items)

Creates a ComboBox cell factory for use in TreeTableColumn controls. By default, the ComboBoxCell is rendered as a 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.

Type Parameters:

S - The type of the TreeTableView generic type

T - The type of the elements contained within the TreeTableColumn.

Parameters:

items - Zero or more items that will be shown to the user when the ComboBox menu is showing. These items must be of the same type as the TreeTableColumn. Note that it is up to the developer to set event handlers to listen to edit events in the TreeTableColumn, and react accordingly. Methods of interest include setOnEditStart, setOnEditCommit, and setOnEditCancel.

Returns:

A Callback that will return a TreeTableCell that is able to work on the type of element contained within the TreeTableColumn.

forTreeTableColumn

public static <S,
T>
Callback<TreeTableColumn<S,T>,TreeTableCell<S,T>> forTreeTableColumn(StringConverter<T> converter,
 ObservableList<T> items)

Creates a ComboBox cell factory for use in TreeTableColumn controls. By default, the ComboBoxCell is rendered as a 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.

Type Parameters:

S - The type of the TreeTableView generic type

T - The type of the elements contained within the TreeTableColumn.

Parameters:

converter - A StringConverter to convert the given item (of type T) to a String for displaying to the user.

items - Zero or more items that will be shown to the user when the ComboBox menu is showing. These items must be of the same type as the TreeTableColumn. Note that it is up to the developer to set event handlers to listen to edit events in the TreeTableColumn, and react accordingly. Methods of interest include setOnEditStart, setOnEditCommit, and setOnEditCancel.

Returns:

A Callback that will return a TreeTableCell that is able to work on the type of element contained within the TreeTableColumn.

converterProperty

public final ObjectProperty<StringConverter<T>> converterProperty()

The StringConverter property.

Returns:

the string converter property

See Also:

• getConverter()
• setConverter(StringConverter)

setConverter

public final void setConverter(StringConverter<T> value)

Sets the StringConverter to be used in this cell.

Parameters:

value - the string converter

getConverter

public final StringConverter<T> getConverter()

Returns the StringConverter used in this cell.

Returns:

the string converter

comboBoxEditableProperty

public final BooleanProperty comboBoxEditableProperty()

A property representing whether the ComboBox, when shown to the user, is editable or not.

Returns:

the property representing whether the ComboBox, when shown to the user, is editable or not

See Also:

• isComboBoxEditable()
• setComboBoxEditable(boolean)

setComboBoxEditable

public final void setComboBoxEditable(boolean value)

Configures the ComboBox to be editable (to allow user input outside of the options provide in the dropdown list).

Parameters:

value - the editable value to be set for this ComboBox

isComboBoxEditable

public final boolean isComboBoxEditable()

Returns true if the ComboBox is editable.

Returns:

true if the ComboBox is editable

getItems

public ObservableList<T> getItems()

Returns the items to be displayed in the ComboBox when it is showing.

Returns:

the items to be displayed in this ComboBox when it is showing

updateItem

public void updateItem(T item,
 boolean empty)

The updateItem method should not be called by developers, but it is the best method for developers to override to allow for them to customise the visuals of the cell. To clarify, developers should never call this method in their code (they should leave it up to the UI control, such as the ListView control) to call this method. However, the purpose of having the updateItem method is so that developers, when specifying custom cell factories (again, like the ListView cell factory), the updateItem method can be overridden to allow for complete customisation of the cell.

It is very important that subclasses of Cell override the updateItem method properly, as failure to do so will lead to issues such as blank cells or cells with unexpected content appearing within them. Here is an example of how to properly override the updateItem method:

 protected void updateItem(T item, boolean empty) {
     super.updateItem(item, empty);

     if (empty || item == null) {
         setText(null);
         setGraphic(null);
     } else {
         setText(item.toString());
     }
 }
 

Note in this code sample two important points:

1. We call the super.updateItem(T, boolean) method. If this is not done, the item and empty properties are not correctly set, and you are likely to end up with graphical issues.
2. We test for the empty condition, and if true, we set the text and graphic properties to null. If we do not do this, it is almost guaranteed that end users will see graphical artifacts in cells unexpectedly.

Overrides:

updateItem in class Cell<T>

Parameters:

item - The new item for the cell.

empty - whether or not this cell represents data from the list. If it is empty, then it does not represent any domain data, but is a cell being used to render an "empty" row.