Class CheckBoxTableCell<S,T>

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

Type Parameters:: T - The type of the elements contained within the TableColumn.

All Implemented Interfaces:: Styleable, EventTarget, Skinnable

public class CheckBoxTableCell<S,T> extends TableCell<S,T>

A class containing a TableCell implementation that draws a CheckBox node inside the cell, optionally with a label to indicate what the checkbox represents.

By default, the CheckBoxTableCell is rendered with a CheckBox centred in the TableColumn. If a label is required, it is necessary to provide a non-null StringConverter instance to the CheckBoxTableCell(Callback, StringConverter) constructor.

To construct an instance of this class, it is necessary to provide a Callback that, given an object of type T, will return an ObservableProperty<Boolean> that represents whether the given item is selected or not. This ObservableValue will be bound bidirectionally (meaning that the CheckBox in the cell will set/unset this property based on user interactions, and the CheckBox will reflect the state of the ObservableValue, if it changes externally).

Note that the CheckBoxTableCell renders the CheckBox 'live', meaning that the CheckBox is always interactive and can be directly toggled by the user. This means that it is not necessary that the cell enter its editing state (usually by the user double-clicking on the cell). A side-effect of this is that the usual editing callbacks (such as on edit commit) will not be called. If you want to be notified of changes, it is recommended to directly observe the boolean properties that are manipulated by the CheckBox.

Since:: JavaFX 2.2

Property Summary

Type	Property	Description
`final ObjectProperty<StringConverter<T>>`	`converter`	The `StringConverter` property.
`final ObjectProperty<Callback<Integer,ObservableValue<Boolean>>>`	`selectedStateCallback`	Property representing the `Callback` that is bound to by the CheckBox shown on screen.

Properties declared in class javafx.scene.control.TableCell

tableColumn, tableRow, tableView

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, 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

Constructor	Description
`CheckBoxTableCell()`	Creates a default CheckBoxTableCell.
`CheckBoxTableCell(Callback<Integer,ObservableValue<Boolean>> getSelectedProperty)`	Creates a default CheckBoxTableCell with a custom `Callback` to retrieve an ObservableValue for a given cell index.
`CheckBoxTableCell(Callback<Integer,ObservableValue<Boolean>> getSelectedProperty, StringConverter<T> converter)`	Creates a CheckBoxTableCell with a custom string converter.

Method Summary

Modifier and Type	Method	Description
`final ObjectProperty<StringConverter<T>>`	`converterProperty()`	The `StringConverter` property.
`static <S> Callback<TableColumn<S,Boolean>,TableCell<S,Boolean>>`	`forTableColumn(TableColumn<S,Boolean> column)`	Creates a cell factory for use in a `TableColumn` cell factory.
`static <S, T> Callback<TableColumn<S,T>,TableCell<S,T>>`	`forTableColumn(Callback<Integer,ObservableValue<Boolean>> getSelectedProperty)`	Creates a cell factory for use in a `TableColumn` cell factory.
`static <S, T> Callback<TableColumn<S,T>,TableCell<S,T>>`	`forTableColumn(Callback<Integer,ObservableValue<Boolean>> getSelectedProperty, boolean showLabel)`	Creates a cell factory for use in a `TableColumn` cell factory.
`static <S, T> Callback<TableColumn<S,T>,TableCell<S,T>>`	`forTableColumn(Callback<Integer,ObservableValue<Boolean>> getSelectedProperty, StringConverter<T> converter)`	Creates a cell factory for use in a `TableColumn` cell factory.
`final StringConverter<T>`	`getConverter()`	Returns the `StringConverter` used in this cell.
`final Callback<Integer,ObservableValue<Boolean>>`	`getSelectedStateCallback()`	Returns the `Callback` that is bound to by the CheckBox shown on screen.
`final ObjectProperty<Callback<Integer,ObservableValue<Boolean>>>`	`selectedStateCallbackProperty()`	Property representing the `Callback` that is bound to by the CheckBox shown on screen.
`final void`	`setConverter(StringConverter<T> value)`	Sets the `StringConverter` to be used in this cell.
`final void`	`setSelectedStateCallback(Callback<Integer,ObservableValue<Boolean>> value)`	Sets the `Callback` that is bound to by the CheckBox shown on screen.
`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.TableCell

getTableColumn, getTableRow, getTableView, tableColumnProperty, tableRowProperty, tableViewProperty, updateTableColumn, updateTableRow, updateTableView

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, isUnderline, isWrapText, labelPaddingProperty, lineSpacingProperty, mnemonicParsingProperty, setAlignment, setContentDisplay, setEllipsisString, setFont, setGraphic, setGraphicTextGap, setLineSpacing, setMnemonicParsing, setText, setTextAlignment, setTextFill, setTextOverrun, setUnderline, setWrapText, textAlignmentProperty, textFillProperty, textOverrunProperty, textProperty, 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()

selectedStateCallback

public final ObjectProperty<Callback<Integer,ObservableValue<Boolean>>> selectedStateCallbackProperty

Property representing the Callback that is bound to by the CheckBox shown on screen.

See Also:

getSelectedStateCallback()
setSelectedStateCallback(Callback)
selectedStateCallbackProperty()

Constructor Details

CheckBoxTableCell

public CheckBoxTableCell()

Creates a default CheckBoxTableCell.

CheckBoxTableCell

public CheckBoxTableCell(Callback<Integer,ObservableValue<Boolean>> getSelectedProperty)

Creates a default CheckBoxTableCell with a custom Callback to retrieve an ObservableValue for a given cell index.

Parameters:: getSelectedProperty - A Callback that will return an ObservableValue given an index from the TableColumn.

CheckBoxTableCell

public CheckBoxTableCell(Callback<Integer,ObservableValue<Boolean>> getSelectedProperty, StringConverter<T> converter)

Creates a CheckBoxTableCell with a custom string converter.

Parameters:: getSelectedProperty - A Callback that will return a ObservableValue given an index from the TableColumn.; converter - A StringConverter that, given an object of type T, will return a String that can be used to represent the object visually.

Method Details

forTableColumn

public static <S> Callback<TableColumn<S,Boolean>,TableCell<S,Boolean>> forTableColumn(TableColumn<S,Boolean> column)

Creates a cell factory for use in a TableColumn cell factory. This method requires that the TableColumn be of type Boolean.

When used in a TableColumn, the CheckBoxCell is rendered with a CheckBox centered in the column.

The ObservableValue<Boolean> contained within each cell in the column will be bound bidirectionally. This means that the CheckBox in the cell will set/unset this property based on user interactions, and the CheckBox will reflect the state of the ObservableValue<Boolean>, if it changes externally).

Type Parameters:: S - The type of the TableView generic type
Parameters:: column - The TableColumn of type Boolean
Returns:: A Callback that will return a TableCell that is able to work on the type of element contained within the TableColumn.

forTableColumn

public static <S, T> Callback<TableColumn<S,T>,TableCell<S,T>> forTableColumn(Callback<Integer,ObservableValue<Boolean>> getSelectedProperty)

Creates a cell factory for use in a TableColumn cell factory. This method requires that the TableColumn be of type ObservableValue<Boolean>.

When used in a TableColumn, the CheckBoxCell is rendered with a CheckBox centered in the column.

Type Parameters:: S - The type of the TableView generic type; T - The type of the elements contained within the TableColumn instance.
Parameters:: getSelectedProperty - A Callback that, given an object of type TableColumn<S,T>, will return an ObservableValue<Boolean> that represents whether the given item is selected or not. This ObservableValue<Boolean> will be bound bidirectionally (meaning that the CheckBox in the cell will set/unset this property based on user interactions, and the CheckBox will reflect the state of the ObservableValue<Boolean>, if it changes externally).
Returns:: A Callback that will return a TableCell that is able to work on the type of element contained within the TableColumn.

forTableColumn

public static <S, T> Callback<TableColumn<S,T>,TableCell<S,T>> forTableColumn(Callback<Integer,ObservableValue<Boolean>> getSelectedProperty, boolean showLabel)

Creates a cell factory for use in a TableColumn cell factory. This method requires that the TableColumn be of type ObservableValue<Boolean>.

When used in a TableColumn, the CheckBoxCell is rendered with a CheckBox centered in the column.

Type Parameters:: S - The type of the TableView generic type; T - The type of the elements contained within the TableColumn instance.
Parameters:: getSelectedProperty - A Callback that, given an object of type TableColumn<S,T>, will return an ObservableValue<Boolean> that represents whether the given item is selected or not. This ObservableValue<Boolean> will be bound bidirectionally (meaning that the CheckBox in the cell will set/unset this property based on user interactions, and the CheckBox will reflect the state of the ObservableValue<Boolean>, if it changes externally).; showLabel - In some cases, it may be desirable to show a label in the TableCell beside the CheckBox. By default a label is not shown, but by setting this to true the item in the cell will also have toString() called on it. If this is not the desired behavior, consider using forTableColumn(javafx.util.Callback, javafx.util.StringConverter), which allows for you to provide a callback that specifies the label for a given row item.
Returns:: A Callback that will return a TableCell that is able to work on the type of element contained within the TableColumn.

forTableColumn

public static <S, T> Callback<TableColumn<S,T>,TableCell<S,T>> forTableColumn(Callback<Integer,ObservableValue<Boolean>> getSelectedProperty, StringConverter<T> converter)

Creates a cell factory for use in a TableColumn cell factory. This method requires that the TableColumn be of type ObservableValue<Boolean>.

When used in a TableColumn, the CheckBoxCell is rendered with a CheckBox centered in the column.

Type Parameters:: S - The type of the TableView generic type; T - The type of the elements contained within the TableColumn instance.
Parameters:: getSelectedProperty - A Callback that, given an object of type TableColumn<S,T>, will return an ObservableValue<Boolean> that represents whether the given item is selected or not. This ObservableValue<Boolean> will be bound bidirectionally (meaning that the CheckBox in the cell will set/unset this property based on user interactions, and the CheckBox will reflect the state of the ObservableValue<Boolean>, if it changes externally).; converter - A StringConverter that, give an object of type T, will return a String that can be used to represent the object visually. The default implementation in forTableColumn(Callback, boolean) (when showLabel is true) is to simply call .toString() on all non-null items (and to just return an empty string in cases where the given item is null).
Returns:: A Callback that will return a TableCell that is able to work on the type of element contained within the TableColumn.

converterProperty

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

The StringConverter property.

Returns:

the StringConverter 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 StringConverter to be used in this cell

getConverter

public final StringConverter<T> getConverter()

Returns the StringConverter used in this cell.

Returns:: the StringConverter used in this cell

selectedStateCallbackProperty

public final ObjectProperty<Callback<Integer,ObservableValue<Boolean>>> selectedStateCallbackProperty()

Property representing the Callback that is bound to by the CheckBox shown on screen.

Returns:

the property representing the Callback that is bound to by the CheckBox shown on screen

See Also:

getSelectedStateCallback()
setSelectedStateCallback(Callback)

setSelectedStateCallback

public final void setSelectedStateCallback(Callback<Integer,ObservableValue<Boolean>> value)

Sets the Callback that is bound to by the CheckBox shown on screen.

Parameters:: value - the Callback that is bound to by the CheckBox shown on screen

getSelectedStateCallback

public final Callback<Integer,ObservableValue<Boolean>> getSelectedStateCallback()

Returns the Callback that is bound to by the CheckBox shown on screen.

Returns:: the Callback that is bound to by the CheckBox shown on screen

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:

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.
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.

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Documentation extracted from JavaFX API Documentation.
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