Class CheckBoxTreeCell<T>

public class CheckBoxTreeCell<T>
extends TreeCell<T>

• Property Summary

  All MethodsInstance MethodsConcrete Methods

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

  • Properties inherited from class javafx.scene.control.TreeCell

    disclosureNode, treeItem, treeView

  • Properties inherited from class javafx.scene.control.IndexedCell

    index

  • Properties inherited from class javafx.scene.control.Cell

    editable, editing, empty, item, selected

  • Properties inherited from class javafx.scene.control.Labeled

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

  • Properties inherited from class javafx.scene.control.Control

    contextMenu, skin, tooltip

  • Properties inherited from class javafx.scene.layout.Region

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

  • Properties inherited from class javafx.scene.Parent

    needsLayout

  • Properties inherited from class javafx.scene.Node

    accessibleHelp, accessibleRoleDescription, accessibleRole, accessibleText, blendMode, boundsInLocal, boundsInParent, cacheHint, cache, clip, cursor, depthTest, disabled, disable, effectiveNodeOrientation, effect, eventDispatcher, focused, focusTraversable, 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, visible

• Field Summary

  • Fields inherited from class javafx.scene.layout.Region

    USE_COMPUTED_SIZE, USE_PREF_SIZE

  • Fields inherited from class javafx.scene.Node

    BASELINE_OFFSET_SAME_AS_HEIGHT

• Constructor Summary

  Constructors

  Constructor and Description
  CheckBoxTreeCell() Creates a default CheckBoxTreeCell that assumes the TreeView is constructed with CheckBoxTreeItem instances, rather than the default TreeItem.
  CheckBoxTreeCell(Callback<TreeItem<T>,ObservableValue<Boolean>> getSelectedProperty) Creates a CheckBoxTreeCell for use in a TreeView control via a cell factory.
  CheckBoxTreeCell(Callback<TreeItem<T>,ObservableValue<Boolean>> getSelectedProperty, StringConverter<TreeItem<T>> converter) Creates a CheckBoxTreeCell for use in a TreeView control via a cell factory.

• Method Summary

  All MethodsStatic MethodsInstance MethodsConcrete Methods

  Modifier and Type	Method and Description
  ObjectProperty<StringConverter<TreeItem<T>>>	converterProperty() The StringConverter property.
  static <T> Callback<TreeView<T>,TreeCell<T>>	forTreeView() Creates a cell factory for use in a TreeView control, although there is a major assumption when used in a TreeView: this cell factory assumes that the TreeView root, and all children are instances of CheckBoxTreeItem, rather than the default TreeItem class that is used normally.
  static <T> Callback<TreeView<T>,TreeCell<T>>	forTreeView(Callback<TreeItem<T>,ObservableValue<Boolean>> getSelectedProperty) Creates a cell factory for use in a TreeView control.
  static <T> Callback<TreeView<T>,TreeCell<T>>	forTreeView(Callback<TreeItem<T>,ObservableValue<Boolean>> getSelectedProperty, StringConverter<TreeItem<T>> converter) Creates a cell factory for use in a TreeView control.
  StringConverter<TreeItem<T>>	getConverter() Returns the StringConverter used in this cell.
  Callback<TreeItem<T>,ObservableValue<Boolean>>	getSelectedStateCallback() Returns the Callback that is bound to by the CheckBox shown on screen.
  ObjectProperty<Callback<TreeItem<T>,ObservableValue<Boolean>>>	selectedStateCallbackProperty() Property representing the Callback that is bound to by the CheckBox shown on screen.
  void	setConverter(StringConverter<TreeItem<T>> value) Sets the StringConverter to be used in this cell.
  void	setSelectedStateCallback(Callback<TreeItem<T>,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 inherited from class javafx.scene.control.TreeCell

    cancelEdit, commitEdit, createDefaultSkin, disclosureNodeProperty, executeAccessibleAction, getDisclosureNode, getTreeItem, getTreeView, queryAccessibleAttribute, setDisclosureNode, startEdit, treeItemProperty, treeViewProperty, updateTreeItem, updateTreeView

  • Methods inherited from class javafx.scene.control.IndexedCell

    getIndex, indexProperty, updateIndex

  • Methods inherited from class javafx.scene.control.Cell

    editableProperty, editingProperty, emptyProperty, getItem, isEditable, isEditing, isEmpty, isItemChanged, isSelected, itemProperty, selectedProperty, setEditable, setItem, updateSelected

  • Methods inherited from class javafx.scene.control.Labeled

    alignmentProperty, contentDisplayProperty, ellipsisStringProperty, fontProperty, getAlignment, getClassCssMetaData, getContentBias, getContentDisplay, getControlCssMetaData, getEllipsisString, getFont, getGraphic, getGraphicTextGap, 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, toString, underlineProperty, wrapTextProperty

  • Methods inherited from class javafx.scene.control.Control

    computeMaxHeight, computeMaxWidth, computeMinHeight, computeMinWidth, computePrefHeight, computePrefWidth, contextMenuProperty, getBaselineOffset, getContextMenu, getCssMetaData, getSkin, getTooltip, isResizable, layoutChildren, setContextMenu, setSkin, setTooltip, skinProperty, tooltipProperty

  • Methods inherited from class javafx.scene.layout.Region

    backgroundProperty, borderProperty, cacheShapeProperty, centerShapeProperty, 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, snapSize, snapSpace, snapToPixelProperty, widthProperty

  • Methods inherited from class javafx.scene.Parent

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

  • Methods inherited from 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, fireEvent, focusedProperty, focusTraversableProperty, getAccessibleHelp, getAccessibleRole, getAccessibleRoleDescription, getAccessibleText, getBlendMode, getBoundsInLocal, getBoundsInParent, getCacheHint, getClip, getCursor, getDepthTest, getEffect, getEffectiveNodeOrientation, getEventDispatcher, getId, 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, hasProperties, hoverProperty, idProperty, inputMethodRequestsProperty, intersects, intersects, isCache, isDisable, isDisabled, isFocused, isFocusTraversable, 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, 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, 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, setVisible, snapshot, snapshot, startDragAndDrop, startFullDrag, styleProperty, toBack, toFront, translateXProperty, translateYProperty, translateZProperty, usesMirroring, visibleProperty

  • Methods inherited from class java.lang.Object

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

• Property Detail

  • converter

    public final ObjectProperty<StringConverter<TreeItem<T>>> converterProperty

    The StringConverter property.

  • selectedStateCallback

    public final ObjectProperty<Callback<TreeItem<T>,ObservableValue<Boolean>>> selectedStateCallbackProperty

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

    See Also:

    getSelectedStateCallback(), setSelectedStateCallback(Callback)

• Constructor Detail

  • CheckBoxTreeCell

    public CheckBoxTreeCell()

    Creates a default CheckBoxTreeCell that assumes the TreeView is constructed with CheckBoxTreeItem instances, rather than the default TreeItem. By using CheckBoxTreeItem, it will internally manage the selected and indeterminate state of each item in the tree.

  • CheckBoxTreeCell

    public CheckBoxTreeCell(Callback<TreeItem<T>,ObservableValue<Boolean>> getSelectedProperty)

    Creates a CheckBoxTreeCell for use in a TreeView control via a cell factory. Unlike CheckBoxTreeCell(), this method does not assume that all TreeItem instances in the TreeView are CheckBoxTreeItem.

    To call this method, it is necessary to provide a Callback that, given an object of type TreeItem, 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).

    If the items are not CheckBoxTreeItem instances, it becomes the developers responsibility to handle updating the state of parent and children TreeItems. This means that, given a TreeItem, this class will simply toggles the ObservableValue<Boolean> that is provided, and no more. Of course, this functionality can then be implemented externally by adding observers to the ObservableValue<Boolean>, and toggling the state of other properties as necessary.

    Parameters:

    getSelectedProperty - A Callback that will return an ObservableValue<Boolean> that represents whether the given item is selected or not.

  • CheckBoxTreeCell

    public CheckBoxTreeCell(Callback<TreeItem<T>,ObservableValue<Boolean>> getSelectedProperty,
                            StringConverter<TreeItem<T>> converter)

    Creates a CheckBoxTreeCell for use in a TreeView control via a cell factory. Unlike CheckBoxTreeCell(), this method does not assume that all TreeItem instances in the TreeView are CheckBoxTreeItem.

    To call this method, it is necessary to provide a Callback that, given an object of type TreeItem, 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).

    If the items are not CheckBoxTreeItem instances, it becomes the developers responsibility to handle updating the state of parent and children TreeItems. This means that, given a TreeItem, this class will simply toggles the ObservableValue<Boolean> that is provided, and no more. Of course, this functionality can then be implemented externally by adding observers to the ObservableValue<Boolean>, and toggling the state of other properties as necessary.

    Parameters:

    getSelectedProperty - A Callback that will return an ObservableValue<Boolean> that represents whether the given item is selected or not.

• Method Detail

  • forTreeView

    public static <T> Callback<TreeView<T>,TreeCell<T>> forTreeView()

    Creates a cell factory for use in a TreeView control, although there is a major assumption when used in a TreeView: this cell factory assumes that the TreeView root, and all children are instances of CheckBoxTreeItem, rather than the default TreeItem class that is used normally.

    When used in a TreeView, the CheckBoxCell is rendered with a CheckBox to the right of the 'disclosure node' (i.e. the arrow). The item stored in TreeItem.getValue() will then have the StringConverter called on it, and this text will take all remaining horizontal space. Additionally, by using CheckBoxTreeItem, the TreeView will automatically handle situations such as:

    • Clicking on the CheckBox beside an item that has children will result in all children also becoming selected/unselected.
    • Clicking on the CheckBox beside an item that has a parent will possibly toggle the state of the parent. For example, if you select a single child, the parent will become indeterminate (indicating partial selection of children). If you proceed to select all children, the parent will then show that it too is selected. This is recursive, with all parent nodes updating as expected.

    Unfortunately, due to limitations in Java, it is necessary to provide an explicit cast when using this method. For example:

    final TreeView<String> treeView = new TreeView<String>();
     treeView.setCellFactory(CheckBoxCell.<String>forTreeView());

    Type Parameters:

    T - The type of the elements contained within the CheckBoxTreeItem instances.

    Returns:

    A Callback that will return a TreeCell that is able to work on the type of element contained within the TreeView root, and all of its children (recursively).

  • forTreeView

    public static <T> Callback<TreeView<T>,TreeCell<T>> forTreeView(Callback<TreeItem<T>,ObservableValue<Boolean>> getSelectedProperty)

    Creates a cell factory for use in a TreeView control. Unlike forTreeView(), this method does not assume that all TreeItem instances in the TreeView are CheckBoxTreeItem instances.

    When used in a TreeView, the CheckBoxCell is rendered with a CheckBox to the right of the 'disclosure node' (i.e. the arrow). The item stored in TreeItem.getValue() will then have the StringConverter called on it, and this text will take all remaining horizontal space.

    Unlike forTreeView(), this cell factory does not handle updating the state of parent or children TreeItems - it simply toggles the ObservableValue<Boolean> that is provided, and no more. Of course, this functionality can then be implemented externally by adding observers to the ObservableValue<Boolean>, and toggling the state of other properties as necessary.

    Type Parameters:

    T - The type of the elements contained within the TreeItem instances.

    Parameters:

    getSelectedProperty - A Callback that, given an object of type TreeItem, 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 TreeCell that is able to work on the type of element contained within the TreeView root, and all of its children (recursively).

  • forTreeView

    public static <T> Callback<TreeView<T>,TreeCell<T>> forTreeView(Callback<TreeItem<T>,ObservableValue<Boolean>> getSelectedProperty,
                                                                    StringConverter<TreeItem<T>> converter)

    Creates a cell factory for use in a TreeView control. Unlike forTreeView(), this method does not assume that all TreeItem instances in the TreeView are CheckBoxTreeItem.

    When used in a TreeView, the CheckBoxCell is rendered with a CheckBox to the right of the 'disclosure node' (i.e. the arrow). The item stored in TreeItem.getValue() will then have the the StringConverter called on it, and this text will take all remaining horizontal space.

    Unlike forTreeView(), this cell factory does not handle updating the state of parent or children TreeItems - it simply toggles the ObservableValue<Boolean> that is provided, and no more. Of course, this functionality can then be implemented externally by adding observers to the ObservableValue<Boolean>, and toggling the state of other properties as necessary.

    Type Parameters:

    T - The type of the elements contained within the TreeItem instances.

    Parameters:

    getSelectedProperty - A Callback that, given an object of type TreeItem, 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 TreeCell that is able to work on the type of element contained within the TreeView root, and all of its children (recursively).

  • converterProperty

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

    The StringConverter property.

  • setConverter

    public final void setConverter(StringConverter<TreeItem<T>> value)

    Sets the StringConverter to be used in this cell.

  • getConverter

    public final StringConverter<TreeItem<T>> getConverter()

    Returns the StringConverter used in this cell.

  • selectedStateCallbackProperty

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

    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<TreeItem<T>,ObservableValue<Boolean>> value)

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

  • getSelectedStateCallback

    public final Callback<TreeItem<T>,ObservableValue<Boolean>> getSelectedStateCallback()

    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:

    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.

    Parameters:

    item - The new item for the cell.