ComboBoxBaseSkin

java.lang.Object
- javafx.scene.control.SkinBase<ComboBoxBase<T>>
- - javafx.scene.control.skin.ComboBoxBaseSkin<T>

Type Parameters:

T - The type of the ComboBox-like control.

All Implemented Interfaces:

Skin<ComboBoxBase<T>>

Direct Known Subclasses:

ComboBoxPopupControl
```
public abstract class ComboBoxBaseSkin<T>
extends SkinBase<ComboBoxBase<T>>
```
An abstract class intended to be used as the base skin for ComboBox-like controls that are based on ComboBoxBase. Most users of this skin class would be well-advised to also look at ComboBoxPopupControl for additional useful API.

Since:

9

See Also:

ComboBoxBase, ComboBoxPopupControl

Constructor Summary

Constructors
Constructor	Description
`ComboBoxBaseSkin(ComboBoxBase<T> control)`	Creates a new instance of ComboBoxBaseSkin, although note that this instance does not handle any behavior / input mappings - this needs to be handled appropriately by subclasses.

Method Summary

All MethodsInstance MethodsAbstract MethodsConcrete Methods
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`	`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`.
`abstract Node`	`getDisplayNode()`	This method should return a Node that will be positioned within the ComboBox 'button' area.
`abstract void`	`hide()`	This method will be called when the ComboBox popup should be hidden.
`protected void`	`layoutChildren(double x, double y, double w, double h)`	Called during the layout pass of the scenegraph.
`abstract void`	`show()`	This method will be called when the ComboBox popup should be displayed.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail
- ComboBoxBaseSkin
```
public ComboBoxBaseSkin(ComboBoxBase<T> control)
```
  Creates a new instance of ComboBoxBaseSkin, although note that this instance does not handle any behavior / input mappings - this needs to be handled appropriately by subclasses.
  
  Parameters:
  
  control - The control that this skin should be installed onto.

Method Detail
- getDisplayNode
```
public abstract Node getDisplayNode()
```
  This method should return a Node that will be positioned within the ComboBox 'button' area.
  
  Returns:
  
  the node that will be positioned within the ComboBox 'button' area
- show
```
public abstract void show()
```
  This method will be called when the ComboBox popup should be displayed. It is up to specific skin implementations to determine how this is handled.
- hide
```
public abstract void hide()
```
  This method will be called when the ComboBox popup should be hidden. It is up to specific skin implementations to determine how this is handled.
- layoutChildren
```
protected void layoutChildren(double x,
                              double y,
                              double w,
                              double h)
```
  Called during the layout pass of the scenegraph.
  
  Overrides:
  
  layoutChildren in class SkinBase<ComboBoxBase<T>>
  
  Parameters:
  
  x - the x position
  
  y - the y position
  
  w - the width
  
  h - the height
- 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.
  
  Overrides:
  
  computePrefWidth in class SkinBase<ComboBoxBase<T>>
  
  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.
  
  Overrides:
  
  computePrefHeight in class SkinBase<ComboBoxBase<T>>
  
  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
- 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.
  
  Overrides:
  
  computeMaxWidth in class SkinBase<ComboBoxBase<T>>
  
  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.
  
  Overrides:
  
  computeMaxHeight in class SkinBase<ComboBoxBase<T>>
  
  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.
- 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().
  
  Overrides:
  
  computeBaselineOffset in class SkinBase<ComboBoxBase<T>>
  
  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

© 2008, 2025, Oracle and/or its affiliates. All rights reserved.
Documentation extracted from JavaFX API Documentation.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
Java, JavaFX and OpenJDK are trademarks or registered trademarks of Oracle and/or its affiliates.

Class ComboBoxBaseSkin<T>

Constructor Summary

Method Summary

Methods inherited from class javafx.scene.control.SkinBase

Methods inherited from class java.lang.Object

Constructor Detail

Method Detail

getDisplayNode

show

hide

layoutChildren

computePrefWidth

computePrefHeight

computeMaxWidth

computeMaxHeight

computeBaselineOffset