Module javafx.controls
Package javafx.scene.control

# Class SkinBase<C extends Control>

java.lang.Object
javafx.scene.control.SkinBase<C>

All Implemented Interfaces:
  `Skin<C>`

Direct Known Subclasses:
  `AccordionSkin`, `ButtonBarSkin`, `ChoiceBoxSkin`, `ComboBoxBaseSkin`, `HTMLEditorSkin`, `LabeledSkinBase`, `MenuBarSkin`, `MenuButtonSkinBase`, `PaginationSkin`, `ProgressIndicatorSkin`, `ScrollBarSkin`, `ScrollPaneSkin`, `SeparatorSkin`, `SliderSkin`, `SpinnerSkin`, `SplitPaneSkin`, `TabPaneSkin`, `TextInputControlSkin`, `ToolBarSkin`, `VirtualContainerBase`

    public abstract class SkinBase<C extends Control>
    extends Object
    implements Skin<C>

Base implementation class for defining the visual representation of user interface controls by defining a scene graph of nodes to represent the `skin`. A user interface control is abstracted behind the `Skinnable` interface.

Since:
  JavaFX 8.0

- ## Constructor Summary

  Constructors
  Modifier | Constructor | Description
  --- | --- | ---
  `protected` | `SkinBase​(C control)` | Constructor for all SkinBase instances.

- ## Method Summary

  Modifier and Type | Method | Description
  --- | --- | ---
  `protected double` | `computeBaselineOffset​(double topInset, double rightInset, double bottomInset, double leftInset)` | Calculates the baseline offset based on the first managed child.
  `protected double` | `computeMaxHeight​(double width, double topInset, double rightInset, double bottomInset, double leftInset)` | Computes the maximum allowable height of the Skin, based on the provided width.
  `protected double` | `computeMaxWidth​(double height, double topInset, double rightInset, double bottomInset, double leftInset)` | Computes the maximum allowable width of the Skin, based on the provided height.
  `protected double` | `computeMinHeight​(double width, double topInset, double rightInset, double bottomInset, double leftInset)` | Computes the minimum allowable height of the Skin, based on the provided width.
  `protected double` | `computeMinWidth​(double height, double topInset, double rightInset, double bottomInset, double leftInset)` | Computes the minimum allowable width of the Skin, based on the provided height.
  `protected double` | `computePrefHeight​(double width, double topInset, double rightInset, double bottomInset, double leftInset)` | Calculates the preferred height of this `SkinBase`.
  `protected double` | `computePrefWidth​(double height, double topInset, double rightInset, double bottomInset, double leftInset)` | Calculates the preferred width of this `SkinBase`.
  `protected void` | `consumeMouseEvents​(boolean value)` | Determines whether all mouse events should be automatically consumed.
  `protected void` | `executeAccessibleAction​(AccessibleAction action, Object... parameters)` | This method is called by the assistive technology to request the action indicated by the argument should be executed.
  `ObservableList<Node>` | `getChildren()` | Returns the children of the skin.
  `static List<CssMetaData<? extends Styleable,​?>>` | `getClassCssMetaData()` | Returns the CssMetaData associated with this class, which may include the CssMetaData of its superclasses.
  `List<CssMetaData<? extends Styleable,​?>>` | `getCssMetaData()` | This method should delegate to `Node.getClassCssMetaData()` so that a Node's CssMetaData can be accessed without the need for reflection.
  `protected void` | `layoutChildren​(double contentX, double contentY, double contentWidth, double contentHeight)` | Called during the layout pass of the scenegraph.
  `protected void` | `layoutInArea​(Node child, double areaX, double areaY, double areaWidth, double areaHeight, double areaBaselineOffset, HPos halignment, VPos valignment)` | Utility method which lays out the child within an area of this skin defined by `areaX`, `areaY`, `areaWidth` x `areaHeight`, with a baseline offset relative to that area.
  `protected void` | `layoutInArea​(Node child, double areaX, double areaY, double areaWidth, double areaHeight, double areaBaselineOffset, Insets margin, boolean fillWidth, boolean fillHeight, HPos halignment, VPos valignment)` | Utility method which lays out the child within an area of this skin defined by `areaX`, `areaY`, `areaWidth` x `areaHeight`, with a baseline offset relative to that area.
  `protected void` | `layoutInArea​(Node child, double areaX, double areaY, double areaWidth, double areaHeight, double areaBaselineOffset, Insets margin, HPos halignment, VPos valignment)` | Utility method which lays out the child within an area of this skin defined by `areaX`, `areaY`, `areaWidth` x `areaHeight`, with a baseline offset relative to that area.
  `protected void` | `positionInArea​(Node child, double areaX, double areaY, double areaWidth, double areaHeight, double areaBaselineOffset, HPos halignment, VPos valignment)` | Utility method which positions the child within an area of this skin defined by `areaX`, `areaY`, `areaWidth` x `areaHeight`, with a baseline offset relative to that area.
  `protected void` | `positionInArea​(Node child, double areaX, double areaY, double areaWidth, double areaHeight, double areaBaselineOffset, Insets margin, HPos halignment, VPos valignment)` | Utility method which positions the child within an area of this skin defined by `areaX`, `areaY`, `areaWidth` x `areaHeight`, with a baseline offset relative to that area.
  `void` | `pseudoClassStateChanged​(PseudoClass pseudoClass, boolean active)` | Used to specify that a pseudo-class of this Node has changed.
  `protected Object` | `queryAccessibleAttribute​(AccessibleAttribute attribute, Object... parameters)` | This method is called by the assistive technology to request the value for an attribute.
  `protected void` | `registerChangeListener​(ObservableValue<?> observable, Consumer<ObservableValue<?>> operation)` | Registers an operation to perform when the given `observable` sends a change event.
  `protected void` | `registerInvalidationListener​(Observable observable, Consumer<Observable> operation)` | Registers an operation to perform when the given `observable` sends an invalidation event.
  `protected void` | `registerListChangeListener​(ObservableList<?> observableList, Consumer<ListChangeListener.Change<?>> operation)` | Registers an operation to perform when the given `observableList` sends a list change event.
  `protected double` | `snappedBottomInset()` | Utility method to get the bottom inset which includes padding and border inset.
  `protected double` | `snappedLeftInset()` | Utility method to get the left inset which includes padding and border inset.
  `protected double` | `snappedRightInset()` | Utility method to get the right inset which includes padding and border inset.
  `protected double` | `snappedTopInset()` | Utility method to get the top inset which includes padding and border inset.
  `protected double` | `snapPosition​(double value)` | Deprecated. replaced by `snapPositionX()` and `snapPositionY()`
  `protected double` | `snapPositionX​(double value)` | Convenience method for accessing the `snapPositionX()` method on the skinnable.
  `protected double` | `snapPositionY​(double value)` | Convenience method for accessing the `snapPositionY()` method on the skinnable.
  `protected double` | `snapSize​(double value)` | Deprecated. replaced by `snapSizeX()` and `snapSizeY()`
  `protected double` | `snapSizeX​(double value)` | Convenience method for accessing the `snapSizeX()` method on the skinnable.
  `protected double` | `snapSizeY​(double value)` | Convenience method for accessing the `snapSizeY()` method on the skinnable.
  `protected double` | `snapSpace​(double value)` | Deprecated. replaced by `snapSpaceX()` and `snapSpaceY()`
  `protected double` | `snapSpaceX​(double value)` | Convenience method for accessing the `snapSpaceX()` method on the skinnable.
  `protected double` | `snapSpaceY​(double value)` | Convenience method for accessing the `snapSpaceY()` method on the skinnable.
  `protected Consumer<ObservableValue<?>>` | `unregisterChangeListeners​(ObservableValue<?> observable)` | Unregisters all operations that have been registered using `registerChangeListener(ObservableValue, Consumer)` for the given `observable`.
  `protected Consumer<Observable>` | `unregisterInvalidationListeners​(Observable observable)` | Unregisters all operations that have been registered using `registerInvalidationListener(Observable, Consumer)` for the given `observable`.
  `protected Consumer<ListChangeListener.Change<?>>` | `unregisterListChangeListeners​(ObservableList<?> observableList)` | Unregisters all operations that have been registered using `registerListChangeListener(ObservableList, Consumer)` for the given `observableList`.

  ### Methods declared in class java.lang.Object

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

  ### Methods declared in interface javafx.scene.control.Skin

  `dispose, getNode, getSkinnable`

- ## Constructor Details

  - ### SkinBase

    protected SkinBase​(C control)
    Constructor for all SkinBase instances.
    Parameters:
      `control` - The control for which this Skin should attach to.

- ## Method Details

  - ### getChildren

    public final ObservableList<Node> getChildren()
    Returns the children of the skin.
    Returns:
      the children of the skin

  - ### layoutChildren

    protected void layoutChildren​(double contentX, double contentY, double contentWidth, double contentHeight)
    Called during the layout pass of the scenegraph.
    Parameters:
      `contentX` - the x position
      `contentY` - the y position
      `contentWidth` - the width
      `contentHeight` - the height

  - ### consumeMouseEvents

    protected final void consumeMouseEvents​(boolean value)
    Determines whether all mouse events should be automatically consumed.
    Parameters:
      `value` - the consume mouse events flag

  - ### registerChangeListener

    protected final void registerChangeListener​(ObservableValue<?> observable, Consumer<ObservableValue<?>> operation)
    Registers an operation to perform when the given `observable` sends a change event. Does nothing if either `observable` or `operation` are `null`. If multiple operations are registered on the same observable, they will be performed in the order in which they were registered.
    Parameters:
      `observable` - the observable to observe for change events, may be `null`
      `operation` - the operation to perform when the observable sends a change event, may be `null`
    Since:
      9

  - ### unregisterChangeListeners

    protected final Consumer<ObservableValue<?>> unregisterChangeListeners​(ObservableValue<?> observable)
    Unregisters all operations that have been registered using `registerChangeListener(ObservableValue, Consumer)` for the given `observable`. Does nothing if `observable` is `null`.
    Parameters:
      `observable` - the observable for which the registered operations should be removed, may be `null`
    Returns:
      a composed consumer representing all previously registered operations, or `null` if none have been registered or the observable is `null`
    Since:
      9

  - ### registerInvalidationListener

    protected final void registerInvalidationListener​(Observable observable, Consumer<Observable> operation)
    Registers an operation to perform when the given `observable` sends an invalidation event. Does nothing if either `observable` or `operation` are `null`. If multiple operations are registered on the same observable, they will be performed in the order in which they were registered.
    Parameters:
      `observable` - the observable to observe for invalidation events, may be `null`
      `operation` - the operation to perform when the observable sends an invalidation event, may be `null`
    Since:
      17

  - ### unregisterInvalidationListeners

    protected final Consumer<Observable> unregisterInvalidationListeners​(Observable observable)
    Unregisters all operations that have been registered using `registerInvalidationListener(Observable, Consumer)` for the given `observable`. Does nothing if `observable` is `null`.
    Parameters:
      `observable` - the observable for which the registered operations should be removed, may be `null`
    Returns:
      a composed consumer representing all previously registered operations, or `null` if none have been registered or the observable is `null`
    Since:
      17

  - ### registerListChangeListener

    protected final void registerListChangeListener​(ObservableList<?> observableList, Consumer<ListChangeListener.Change<?>> operation)
    Registers an operation to perform when the given `observableList` sends a list change event. Does nothing if either `observableList` or `operation` are `null`. If multiple operations are registered on the same observable list, they will be performed in the order in which they were registered.
    Parameters:
      `observableList` - the observableList to observe for list change events, may be `null`
      `operation` - the operation to perform when the observableList sends a list change event, may be `null`
    Since:
      17

  - ### unregisterListChangeListeners

    protected final Consumer<ListChangeListener.Change<?>> unregisterListChangeListeners​(ObservableList<?> observableList)
    Unregisters all operations that have been registered using `registerListChangeListener(ObservableList, Consumer)` for the given `observableList`. Does nothing if `observableList` is `null`.
    Parameters:
      `observableList` - the observableList for which the registered operations should be removed, may be `null`
    Returns:
      a composed consumer representing all previously registered operations, or `null` if none have been registered or the observableList is `null`
    Since:
      17

  - ### computeMinWidth

    protected double computeMinWidth​(double height, double topInset, double rightInset, double bottomInset, double leftInset)
    Computes the minimum allowable width of the Skin, based on the provided height.
    Parameters:
      `height` - The height of the Skin, in case this value might dictate the minimum width.
      `topInset` - the pixel snapped top inset
      `rightInset` - the pixel snapped right inset
      `bottomInset` - the pixel snapped bottom inset
      `leftInset` - the pixel snapped left inset
    Returns:
      A double representing the minimum width of this Skin.

  - ### computeMinHeight

    protected double computeMinHeight​(double width, double topInset, double rightInset, double bottomInset, double leftInset)
    Computes the minimum allowable height of the Skin, based on the provided width.
    Parameters:
      `width` - The width of the Skin, in case this value might dictate the minimum height.
      `topInset` - the pixel snapped top inset
      `rightInset` - the pixel snapped right inset
      `bottomInset` - the pixel snapped bottom inset
      `leftInset` - the pixel snapped left inset
    Returns:
      A double representing the minimum height of this Skin.

  - ### computeMaxWidth

    protected double computeMaxWidth​(double height, double topInset, double rightInset, double bottomInset, double leftInset)
    Computes the maximum allowable width of the Skin, based on the provided height.
    Parameters:
      `height` - The height of the Skin, in case this value might dictate the maximum width.
      `topInset` - the pixel snapped top inset
      `rightInset` - the pixel snapped right inset
      `bottomInset` - the pixel snapped bottom inset
      `leftInset` - the pixel snapped left inset
    Returns:
      A double representing the maximum width of this Skin.

  - ### computeMaxHeight

    protected double computeMaxHeight​(double width, double topInset, double rightInset, double bottomInset, double leftInset)
    Computes the maximum allowable height of the Skin, based on the provided width.
    Parameters:
      `width` - The width of the Skin, in case this value might dictate the maximum height.
      `topInset` - the pixel snapped top inset
      `rightInset` - the pixel snapped right inset
      `bottomInset` - the pixel snapped bottom inset
      `leftInset` - the pixel snapped left inset
    Returns:
      A double representing the maximum height of this Skin.

  - ### computePrefWidth

    protected double computePrefWidth​(double height, double topInset, double rightInset, double bottomInset, double leftInset)
    Calculates the preferred width of this `SkinBase`. The default implementation calculates this width as the width of the area occupied by its managed children when they are positioned at their current positions at their preferred widths.
    Parameters:
      `height` - the height that should be used if preferred width depends on it
      `topInset` - the pixel snapped top inset
      `rightInset` - the pixel snapped right inset
      `bottomInset` - the pixel snapped bottom inset
      `leftInset` - the pixel snapped left inset
    Returns:
      the calculated preferred width

  - ### computePrefHeight

    protected double computePrefHeight​(double width, double topInset, double rightInset, double bottomInset, double leftInset)
    Calculates the preferred height of this `SkinBase`. The default implementation calculates this height as the height of the area occupied by its managed children when they are positioned at their current positions at their preferred heights.
    Parameters:
      `width` - the width that should be used if preferred height depends on it
      `topInset` - the pixel snapped top inset
      `rightInset` - the pixel snapped right inset
      `bottomInset` - the pixel snapped bottom inset
      `leftInset` - the pixel snapped left inset
    Returns:
      the calculated preferred height

  - ### computeBaselineOffset

    protected double computeBaselineOffset​(double topInset, double rightInset, double bottomInset, double leftInset)
    Calculates the baseline offset based on the first managed child. If there is no such child, returns `Node.getBaselineOffset()`.
    Parameters:
      `topInset` - the pixel snapped top inset
      `rightInset` - the pixel snapped right inset
      `bottomInset` - the pixel snapped bottom inset
      `leftInset` - the pixel snapped left inset
    Returns:
      baseline offset

  - ### snappedTopInset

    protected double snappedTopInset()
    Utility method to get the top inset which includes padding and border inset. Then snapped to whole pixels if getSkinnable().isSnapToPixel() is true.
    Returns:
      Rounded up insets top

  - ### snappedBottomInset

    protected double snappedBottomInset()
    Utility method to get the bottom inset which includes padding and border inset. Then snapped to whole pixels if getSkinnable().isSnapToPixel() is true.
    Returns:
      Rounded up insets bottom

  - ### snappedLeftInset

    protected double snappedLeftInset()
    Utility method to get the left inset which includes padding and border inset. Then snapped to whole pixels if getSkinnable().isSnapToPixel() is true.
    Returns:
      Rounded up insets left

  - ### snappedRightInset

    protected double snappedRightInset()
    Utility method to get the right inset which includes padding and border inset. Then snapped to whole pixels if getSkinnable().isSnapToPixel() is true.
    Returns:
      Rounded up insets right

  - ### snapSpace

    @Deprecated(since="9") protected double snapSpace​(double value)
    Deprecated.
    replaced by `snapSpaceX()` and `snapSpaceY()`
    If `getSkinnable().isSnapToPixel()` is false, this method returns the same value, else it tries to return a value rounded to the nearest pixel, but since there is no indication if the value is a vertical or horizontal measurement then it may be snapped to the wrong pixel size metric on screens with different horizontal and vertical scales.
    Parameters:
      `value` - the space value to be snapped
    Returns:
      value rounded to nearest pixel

  - ### snapSpaceX

    protected double snapSpaceX​(double value)
    Convenience method for accessing the `snapSpaceX()` method on the skinnable. It is equivalent to calling `getSkinnable().snapSpaceX(value)`.
    Parameters:
      `value` - the space value to be snapped
    Returns:
      value rounded to nearest pixel
    Since:
      9
    See Also:
      `Region.snapSpaceX(double)`

  - ### snapSpaceY

    protected double snapSpaceY​(double value)
    Convenience method for accessing the `snapSpaceY()` method on the skinnable. It is equivalent to calling `getSkinnable().snapSpaceY(value)`.
    Parameters:
      `value` - the space value to be snapped
    Returns:
      value rounded to nearest pixel
    Since:
      9
    See Also:
      `Region.snapSpaceY(double)`

  - ### snapSize

    @Deprecated(since="9") protected double snapSize​(double value)
    Deprecated.
    replaced by `snapSizeX()` and `snapSizeY()`
    If `getSkinnable().isSnapToPixel()` is false, this method returns the same value, else it tries to return a value ceiled to the nearest pixel, but since there is no indication if the value is a vertical or horizontal measurement then it may be snapped to the wrong pixel size metric on screens with different horizontal and vertical scales.
    Parameters:
      `value` - the size value to be snapped
    Returns:
      value ceiled to nearest pixel

  - ### snapSizeX

    protected double snapSizeX​(double value)
    Convenience method for accessing the `snapSizeX()` method on the skinnable. It is equivalent to calling `getSkinnable().snapSizeX(value)`.
    Parameters:
      `value` - the size value to be snapped
    Returns:
      value ceiled to nearest pixel
    Since:
      9
    See Also:
      `Region.snapSizeX(double)`

  - ### snapSizeY

    protected double snapSizeY​(double value)
    Convenience method for accessing the `snapSizeY()` method on the skinnable. It is equivalent to calling `getSkinnable().snapSizeY(value)`.
    Parameters:
      `value` - the size value to be snapped
    Returns:
      value ceiled to nearest pixel
    Since:
      9
    See Also:
      `Region.snapSizeY(double)`

  - ### snapPosition

    @Deprecated(since="9") protected double snapPosition​(double value)
    Deprecated.
    replaced by `snapPositionX()` and `snapPositionY()`
    If `getSkinnable().isSnapToPixel()` is false, this method returns the same value, else it tries to return a value rounded to the nearest pixel, but since there is no indication if the value is a vertical or horizontal measurement then it may be snapped to the wrong pixel size metric on screens with different horizontal and vertical scales.
    Parameters:
      `value` - the position value to be snapped
    Returns:
      value rounded to nearest pixel

  - ### snapPositionX

    protected double snapPositionX​(double value)
    Convenience method for accessing the `snapPositionX()` method on the skinnable. It is equivalent to calling `getSkinnable().snapPositionX(value)`.
    Parameters:
      `value` - the position value to be snapped
    Returns:
      value rounded to nearest pixel
    Since:
      9
    See Also:
      `Region.snapPositionX(double)`

  - ### snapPositionY

    protected double snapPositionY​(double value)
    Convenience method for accessing the `snapPositionY()` method on the skinnable. It is equivalent to calling `getSkinnable().snapPositionY(value)`.
    Parameters:
      `value` - the position value to be snapped
    Returns:
      value rounded to nearest pixel
    Since:
      9
    See Also:
      `Region.snapPositionY(double)`

  - ### positionInArea

    protected void positionInArea​(Node child, double areaX, double areaY, double areaWidth, double areaHeight, double areaBaselineOffset, HPos halignment, VPos valignment)
    Utility method which positions the child within an area of this skin defined by `areaX`, `areaY`, `areaWidth` x `areaHeight`, with a baseline offset relative to that area.

    This function does not resize the node and uses the node's layout bounds width and height to determine how it should be positioned within the area.

    If the vertical alignment is `VPos.BASELINE` then it will position the node so that its own baseline aligns with the passed in `baselineOffset`, otherwise the baseline parameter is ignored.

    If `snapToPixel` is `true` for this skin, then the x/y position values will be rounded to their nearest pixel boundaries.

    Parameters:
      `child` - the child being positioned within this skin
      `areaX` - the horizontal offset of the layout area relative to this skin
      `areaY` - the vertical offset of the layout area relative to this skin
      `areaWidth` - the width of the layout area
      `areaHeight` - the height of the layout area
      `areaBaselineOffset` - the baseline offset to be used if VPos is BASELINE
      `halignment` - the horizontal alignment for the child within the area
      `valignment` - the vertical alignment for the child within the area

  - ### positionInArea

    protected void positionInArea​(Node child, double areaX, double areaY, double areaWidth, double areaHeight, double areaBaselineOffset, Insets margin, HPos halignment, VPos valignment)
    Utility method which positions the child within an area of this skin defined by `areaX`, `areaY`, `areaWidth` x `areaHeight`, with a baseline offset relative to that area.

    This function does not resize the node and uses the node's layout bounds width and height to determine how it should be positioned within the area.

    If the vertical alignment is `VPos.BASELINE` then it will position the node so that its own baseline aligns with the passed in `baselineOffset`, otherwise the baseline parameter is ignored.

    If `snapToPixel` is `true` for this skin, then the x/y position values will be rounded to their nearest pixel boundaries.

    If `margin` is non-null, then that space will be allocated around the child within the layout area. margin may be null.

    Parameters:
      `child` - the child being positioned within this skin
      `areaX` - the horizontal offset of the layout area relative to this skin
      `areaY` - the vertical offset of the layout area relative to this skin
      `areaWidth` - the width of the layout area
      `areaHeight` - the height of the layout area
      `areaBaselineOffset` - the baseline offset to be used if VPos is BASELINE
      `margin` - the margin of space to be allocated around the child
      `halignment` - the horizontal alignment for the child within the area
      `valignment` - the vertical alignment for the child within the area
    Since:
      JavaFX 8.0

  - ### layoutInArea

    protected void layoutInArea​(Node child, double areaX, double areaY, double areaWidth, double areaHeight, double areaBaselineOffset, HPos halignment, VPos valignment)
    Utility method which lays out the child within an area of this skin defined by `areaX`, `areaY`, `areaWidth` x `areaHeight`, with a baseline offset relative to that area.

    If the child is resizable, this method will resize it to fill the specified area unless the node's maximum size prevents it. If the node's maximum size preference is less than the area size, the maximum size will be used. If node's maximum is greater than the area size, then the node will be resized to fit within the area, unless its minimum size prevents it.

    If the child has a non-null contentBias, then this method will use it when resizing the child. If the contentBias is horizontal, it will set its width first to the area's width (up to the child's max width limit) and then pass that value to compute the child's height. If child's contentBias is vertical, then it will set its height to the area height (up to child's max height limit) and pass that height to compute the child's width. If the child's contentBias is null, then it's width and height have no dependencies on each other.

    If the child is not resizable (Shape, Group, etc) then it will only be positioned and not resized.

    If the child's resulting size differs from the area's size (either because it was not resizable or it's sizing preferences prevented it), then this function will align the node relative to the area using horizontal and vertical alignment values. If valignment is `VPos.BASELINE` then the node's baseline will be aligned with the area baseline offset parameter, otherwise the baseline parameter is ignored.

    If `snapToPixel` is `true` for this skin, then the resulting x,y values will be rounded to their nearest pixel boundaries and the width/height values will be ceiled to the next pixel boundary.

    Parameters:
      `child` - the child being positioned within this skin
      `areaX` - the horizontal offset of the layout area relative to this skin
      `areaY` - the vertical offset of the layout area relative to this skin
      `areaWidth` - the width of the layout area
      `areaHeight` - the height of the layout area
      `areaBaselineOffset` - the baseline offset to be used if VPos is BASELINE
      `halignment` - the horizontal alignment for the child within the area
      `valignment` - the vertical alignment for the child within the area

  - ### layoutInArea

    protected void layoutInArea​(Node child, double areaX, double areaY, double areaWidth, double areaHeight, double areaBaselineOffset, Insets margin, HPos halignment, VPos valignment)
    Utility method which lays out the child within an area of this skin defined by `areaX`, `areaY`, `areaWidth` x `areaHeight`, with a baseline offset relative to that area.

    If the child is resizable, this method will resize it to fill the specified area unless the node's maximum size prevents it. If the node's maximum size preference is less than the area size, the maximum size will be used. If node's maximum is greater than the area size, then the node will be resized to fit within the area, unless its minimum size prevents it.

    If the child has a non-null contentBias, then this method will use it when resizing the child. If the contentBias is horizontal, it will set its width first to the area's width (up to the child's max width limit) and then pass that value to compute the child's height. If child's contentBias is vertical, then it will set its height to the area height (up to child's max height limit) and pass that height to compute the child's width. If the child's contentBias is null, then it's width and height have no dependencies on each other.

    If the child is not resizable (Shape, Group, etc) then it will only be positioned and not resized.

    If the child's resulting size differs from the area's size (either because it was not resizable or it's sizing preferences prevented it), then this function will align the node relative to the area using horizontal and vertical alignment values. If valignment is `VPos.BASELINE` then the node's baseline will be aligned with the area baseline offset parameter, otherwise the baseline parameter is ignored.

    If `margin` is non-null, then that space will be allocated around the child within the layout area. margin may be null.

    If `snapToPixel` is `true` for this skin, then the resulting x,y values will be rounded to their nearest pixel boundaries and the width/height values will be ceiled to the next pixel boundary.

    Parameters:
      `child` - the child being positioned within this skin
      `areaX` - the horizontal offset of the layout area relative to this skin
      `areaY` - the vertical offset of the layout area relative to this skin
      `areaWidth` - the width of the layout area
      `areaHeight` - the height of the layout area
      `areaBaselineOffset` - the baseline offset to be used if VPos is BASELINE
      `margin` - the margin of space to be allocated around the child
      `halignment` - the horizontal alignment for the child within the area
      `valignment` - the vertical alignment for the child within the area

  - ### layoutInArea

    protected void layoutInArea​(Node child, double areaX, double areaY, double areaWidth, double areaHeight, double areaBaselineOffset, Insets margin, boolean fillWidth, boolean fillHeight, HPos halignment, VPos valignment)
    Utility method which lays out the child within an area of this skin defined by `areaX`, `areaY`, `areaWidth` x `areaHeight`, with a baseline offset relative to that area.

    If the child is resizable, this method will use `fillWidth` and `fillHeight` to determine whether to resize it to fill the area or keep the child at its preferred dimension. If fillWidth/fillHeight are true, then this method will only resize the child up to its max size limits. If the node's maximum size preference is less than the area size, the maximum size will be used. If node's maximum is greater than the area size, then the node will be resized to fit within the area, unless its minimum size prevents it.

    If the child has a non-null contentBias, then this method will use it when resizing the child. If the contentBias is horizontal, it will set its width first and then pass that value to compute the child's height. If child's contentBias is vertical, then it will set its height first and pass that value to compute the child's width. If the child's contentBias is null, then it's width and height have no dependencies on each other.

    If the child is not resizable (Shape, Group, etc) then it will only be positioned and not resized.

    If the child's resulting size differs from the area's size (either because it was not resizable or it's sizing preferences prevented it), then this function will align the node relative to the area using horizontal and vertical alignment values. If valignment is `VPos.BASELINE` then the node's baseline will be aligned with the area baseline offset parameter, otherwise the baseline parameter is ignored.

    If `margin` is non-null, then that space will be allocated around the child within the layout area. margin may be null.

    If `snapToPixel` is `true` for this skin, then the resulting x,y values will be rounded to their nearest pixel boundaries and the width/height values will be ceiled to the next pixel boundary.

    Parameters:
      `child` - the child being positioned within this skin
      `areaX` - the horizontal offset of the layout area relative to this skin
      `areaY` - the vertical offset of the layout area relative to this skin
      `areaWidth` - the width of the layout area
      `areaHeight` - the height of the layout area
      `areaBaselineOffset` - the baseline offset to be used if VPos is BASELINE
      `margin` - the margin of space to be allocated around the child
      `fillWidth` - whether or not the child should be resized to fill the area width or kept to its preferred width
      `fillHeight` - whether or not the child should e resized to fill the area height or kept to its preferred height
      `halignment` - the horizontal alignment for the child within the area
      `valignment` - the vertical alignment for the child within the area

  - ### getClassCssMetaData

    public static List<CssMetaData<? extends Styleable,​?>> getClassCssMetaData()
    Returns the CssMetaData associated with this class, which may include the CssMetaData of its superclasses.
    Returns:
      the CssMetaData associated with this class, which may include the CssMetaData of its superclasses

  - ### getCssMetaData

    public List<CssMetaData<? extends Styleable,​?>> getCssMetaData()
    This method should delegate to `Node.getClassCssMetaData()` so that a Node's CssMetaData can be accessed without the need for reflection.
    Returns:
      The CssMetaData associated with this node, which may include the CssMetaData of its superclasses.

  - ### pseudoClassStateChanged

    public final void pseudoClassStateChanged​(PseudoClass pseudoClass, boolean active)
    Used to specify that a pseudo-class of this Node has changed. If the pseudo-class is used in a CSS selector that matches this Node, CSS will be reapplied. Typically, this method is called from the `invalidated` method of a property that is used as a pseudo-class. For example:

             private static final PseudoClass MY_PSEUDO_CLASS_STATE = PseudoClass.getPseudoClass("my-state");

             BooleanProperty myPseudoClassState = new BooleanPropertyBase(false) {

                   @Override public void invalidated() {
                        pseudoClassStateChanged(MY_PSEUDO_CLASS_STATE, get());
                   }

                   @Override public Object getBean() {
                       return MyControl.this;
                   }

                   @Override public String getName() {
                       return "myPseudoClassState";
                   }
               };

    Parameters:
      `pseudoClass` - the pseudo-class that has changed state
      `active` - whether or not the state is active
    Since:
      JavaFX 8.0
    See Also:
      `Node.pseudoClassStateChanged(javafx.css.PseudoClass, boolean)`

  - ### queryAccessibleAttribute

    protected Object queryAccessibleAttribute​(AccessibleAttribute attribute, Object... parameters)
    This method is called by the assistive technology to request the value for an attribute.

    This method is commonly overridden by subclasses to implement attributes that are required for a specific role.
    If a particular attribute is not handled, the superclass implementation must be called.

    Parameters:
      `attribute` - the requested attribute
      `parameters` - optional list of parameters
    Returns:
      the value for the requested attribute
    Since:
      JavaFX 8u40
    See Also:
      `AccessibleAttribute`, `Node.queryAccessibleAttribute(javafx.scene.AccessibleAttribute, java.lang.Object...)`

  - ### executeAccessibleAction

    protected void executeAccessibleAction​(AccessibleAction action, Object... parameters)
    This method is called by the assistive technology to request the action indicated by the argument should be executed.

    This method is commonly overridden by subclasses to implement action that are required for a specific role.
    If a particular action is not handled, the superclass implementation must be called.

    Parameters:
      `action` - the action to execute
      `parameters` - optional list of parameters
    Since:
      JavaFX 8u40
    See Also:
      `AccessibleAction`, `Node.executeAccessibleAction(javafx.scene.AccessibleAction, java.lang.Object...)`