TreeCell (JavaFX 25)
Description: declaration: module: javafx.controls, package: javafx.scene.control, class: TreeCell

# Class TreeCell<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.TreeCell<T>

Type Parameters:
  `T` - The type of the value contained within the `TreeItem` property.

All Implemented Interfaces:
  `Styleable, EventTarget, Skinnable`

Direct Known Subclasses:
  `CheckBoxTreeCell, ChoiceBoxTreeCell, ComboBoxTreeCell, TextFieldTreeCell`

public class TreeCell<T> extends IndexedCell<T>
The `Cell` type used with the `TreeView` control. In addition to the API defined on `IndexedCell`, the TreeCell exposes additional states and pseudo classes for use by CSS.

A TreeCell watches the selection model of the TreeView for which it is associated, ensuring that it visually indicates to the user whether it is selected. When a TreeCell is selected, this is exposed both via the `selected` property, as well as via the 'selected' CSS pseudo class state.

Due to the fact that TreeCell extends from `IndexedCell`, each TreeCell also provides an `index` property. The index will be updated as cells are expanded and collapsed, and therefore should be considered a view index rather than a model index.

Finally, each TreeCell also has a reference back to the TreeView that it is being used with. Each TreeCell belongs to one and only one TreeView.

Since:
  JavaFX 2.0
See Also:
  - `TreeView`
  - `TreeItem`

- ## Property Summary

  Properties
  Type
  Property
  Description
  `final ObjectProperty<Node>`
  `disclosureNode`
  The disclosure node is commonly seen represented as a triangle that rotates on screen to indicate whether or not the TreeItem that it is placed beside is expanded or collapsed.
  `final ReadOnlyObjectProperty<TreeItem<T>>`
  `treeItem`
  Each TreeCell represents at most a single `TreeItem`, which is represented by this property.
  `final ReadOnlyObjectProperty<TreeView<T>>`
  `treeView`
  A TreeCell is explicitly linked to a single `TreeView` instance, which is represented by this property.

  ### Properties declared in class IndexedCell

  `index`

  ### Properties declared in class Cell

  `editable, editing, empty, item, selected`

  ### Properties declared in class Labeled

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

  ### Properties declared in class Control

  `contextMenu, skin, tooltip`

  ### Properties declared in class Region

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

  ### Properties declared in class Parent

  `needsLayout`

  ### Properties declared in class 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 Region

  `USE_COMPUTED_SIZE, USE_PREF_SIZE`

  ### Fields declared in class Node

  `BASELINE_OFFSET_SAME_AS_HEIGHT`

- ## Constructor Summary

  Constructors
  Constructor
  Description
  `TreeCell()`
  Creates a default TreeCell instance.

- ## Method Summary

  Modifier and Type
  Method
  Description
  `final ObjectProperty<Node>`
  `disclosureNodeProperty()`
  The disclosure node is commonly seen represented as a triangle that rotates on screen to indicate whether or not the TreeItem that it is placed beside is expanded or collapsed.
  `final Node`
  `getDisclosureNode()`
  Returns the current disclosure node set in this TreeCell.
  `final TreeItem<T>`
  `getTreeItem()`
  Returns the TreeItem currently set in this TreeCell.
  `final TreeView<T>`
  `getTreeView()`
  Returns the TreeView associated with this TreeCell.
  `final void`
  `setDisclosureNode(Node value)`
  The node to use as the "disclosure" triangle, or toggle, used for expanding and collapsing items.
  `final ReadOnlyObjectProperty<TreeItem<T>>`
  `treeItemProperty()`
  Each TreeCell represents at most a single `TreeItem`, which is represented by this property.
  `final ReadOnlyObjectProperty<TreeView<T>>`
  `treeViewProperty()`
  A TreeCell is explicitly linked to a single `TreeView` instance, which is represented by this property.
  `final void`
  `updateTreeItem(TreeItem<T> treeItem)`
  Updates the TreeItem associated with this TreeCell.
  `final void`
  `updateTreeView(TreeView<T> tree)`
  Updates the TreeView associated with this TreeCell.

  ### Methods declared in class IndexedCell

  `getIndex, indexProperty, updateIndex`

  ### Methods declared in class Cell

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

  ### Methods declared in class 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 Control

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

  ### Methods declared in class 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 Parent

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

  ### Methods declared in class 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, requestFocusTraversal, 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 Object

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

  ### Methods declared in interface Styleable

  `getStyleableNode`

- ## Property Details

  - ### treeItem

    public final ReadOnlyObjectProperty<TreeItem<T>> treeItemProperty
    Each TreeCell represents at most a single `TreeItem`, which is represented by this property.
    See Also:
      - `getTreeItem()`
      - `treeItemProperty()`

  - ### disclosureNode

    public final ObjectProperty<Node> disclosureNodeProperty
    The disclosure node is commonly seen represented as a triangle that rotates on screen to indicate whether or not the TreeItem that it is placed beside is expanded or collapsed.
    See Also:
      - `getDisclosureNode()`
      - `setDisclosureNode(Node)`
      - `disclosureNodeProperty()`

  - ### treeView

    public final ReadOnlyObjectProperty<TreeView<T>> treeViewProperty
    A TreeCell is explicitly linked to a single `TreeView` instance, which is represented by this property.
    See Also:
      - `getTreeView()`
      - `treeViewProperty()`

- ## Constructor Details

  - ### TreeCell

    public TreeCell()
    Creates a default TreeCell instance.

- ## Method Details

  - ### getTreeItem

    public final TreeItem<T> getTreeItem()
    Returns the TreeItem currently set in this TreeCell.
    Returns:
      the TreeItem currently set in this TreeCell

  - ### treeItemProperty

    public final ReadOnlyObjectProperty<TreeItem<T>> treeItemProperty()
    Each TreeCell represents at most a single `TreeItem`, which is represented by this property.
    Returns:
      the TreeItem property representing this TreeCell
    See Also:
      - `getTreeItem()`

  - ### setDisclosureNode

    public final void setDisclosureNode(Node value)
    The node to use as the "disclosure" triangle, or toggle, used for expanding and collapsing items. This is only used in the case of an item in the tree which contains child items. If not specified, the TreeCell's Skin implementation is responsible for providing a default disclosure node.
    Parameters:
      `value` - the disclosure node

  - ### getDisclosureNode

    public final Node getDisclosureNode()
    Returns the current disclosure node set in this TreeCell.
    Returns:
      the current disclosure node set in this TreeCell

  - ### disclosureNodeProperty

    public final ObjectProperty<Node> disclosureNodeProperty()
    The disclosure node is commonly seen represented as a triangle that rotates on screen to indicate whether or not the TreeItem that it is placed beside is expanded or collapsed.
    Returns:
      the disclosure node
    See Also:
      - `getDisclosureNode()`
      - `setDisclosureNode(Node)`

  - ### getTreeView

    public final TreeView<T> getTreeView()
    Returns the TreeView associated with this TreeCell.
    Returns:
      the TreeView associated with this TreeCell

  - ### treeViewProperty

    public final ReadOnlyObjectProperty<TreeView<T>> treeViewProperty()
    A TreeCell is explicitly linked to a single `TreeView` instance, which is represented by this property.
    Returns:
      the TreeView property of this TreeCell
    See Also:
      - `getTreeView()`

  - ### updateTreeView

    public final void updateTreeView(TreeView<T> tree)
    Updates the TreeView associated with this TreeCell.
    Parameters:
      `tree` - The new TreeView that should be associated with this TreeCell. Note: This function is intended to be used by experts, primarily by those implementing new Skins. It is not common for developers or designers to access this function directly.

  - ### updateTreeItem

    public final void updateTreeItem(TreeItem<T> treeItem)
    Updates the TreeItem associated with this TreeCell.
    Parameters:
      `treeItem` - The new TreeItem that should be associated with this TreeCell. Note: This function is intended to be used by experts, primarily by those implementing new Skins. It is not common for developers or designers to access this function directly.