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.
  `void` | `dispose()` | Called by a Skinnable when the Skin is replaced on the Skinnable.
  `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.
  `Node` | `getNode()` | Gets the Node which represents this Skin.
  `C` | `getSkinnable()` | Gets the Skinnable to which this Skin is assigned.
  `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<?> property, Consumer<ObservableValue<?>> consumer)` | Subclasses can invoke this method to register that they want to listen to property change events for the given property.
  `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<?> property)` | Unregisters all change listeners that have been registered using `registerChangeListener(ObservableValue, Consumer)` for the given property.

  ### Methods inherited from class java.lang.Object

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

- ## 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

  - ### getSkinnable

    public final C getSkinnable()
    Gets the Skinnable to which this Skin is assigned. A Skin must be created for one and only one Skinnable. This value will only ever go from a non-null to null value when the Skin is removed from the Skinnable, and only as a consequence of a call to `Skin.dispose()`.

    The caller who constructs a Skinnable must also construct a Skin and properly establish the relationship between the Control and its Skin.

    Specified by:
      `getSkinnable` in interface `Skin<C extends Control>`
    Returns:
      A non-null Skinnable, or null value if disposed.

  - ### getNode

    public final Node getNode()
    Gets the Node which represents this Skin. This must never be null, except after a call to `Skin.dispose()`, and must never change except when changing to null.
    Specified by:
      `getNode` in interface `Skin<C extends Control>`
    Returns:
      A non-null Node, except when the Skin has been disposed.

  - ### dispose

    public void dispose()
    Called by a Skinnable when the Skin is replaced on the Skinnable. This method allows a Skin to implement any logic necessary to clean up itself after the Skin is no longer needed. It may be used to release native resources. The methods `Skin.getSkinnable()` and `Skin.getNode()` should return null following a call to dispose. Calling dispose twice has no effect.
    Specified by:
      `dispose` in interface `Skin<C extends Control>`

  - ### 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<?> property, Consumer<ObservableValue<?>> consumer)
    Subclasses can invoke this method to register that they want to listen to property change events for the given property. Registered `Consumer` instances will be executed in the order in which they are registered.
    Parameters:
      `property` - the property
      `consumer` - the consumer

  - ### unregisterChangeListeners

    protected final Consumer<ObservableValue<?>> unregisterChangeListeners​(ObservableValue<?> property)
    Unregisters all change listeners that have been registered using `registerChangeListener(ObservableValue, Consumer)` for the given property. The end result is that the given property is no longer observed by any of the change listeners, but it may still have additional listeners registered on it through means outside of `registerChangeListener(ObservableValue, Consumer)`.
    Parameters:
      `property` - The property for which all listeners should be removed.
    Returns:
      A single chained `Consumer` consisting of all `consumers` registered through `registerChangeListener(ObservableValue, Consumer)`. If no consumers have been registered on this property, null will be returned.
    Since:
      9

  - ### 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...)`