Module javafx.controls

Package javafx.scene.control.skin

Class TreeViewSkin<T>

java.lang.Object

javafx.scene.control.SkinBase<C>

javafx.scene.control.skin.VirtualContainerBase<TreeView<T>,TreeCell<T>>

javafx.scene.control.skin.TreeViewSkin<T>

All Implemented Interfaces:

Skin<TreeView<T>>

public class TreeViewSkin<T>
extends VirtualContainerBase<TreeView<T>,TreeCell<T>>

Default skin implementation for the TreeView control.

Since:

9

See Also:

TreeView

Constructor Summary

Constructors

Constructor	Description
TreeViewSkin(TreeView control)	Creates a new TreeViewSkin instance, installing the necessary child nodes into the Control children list, as well as the necessary input mappings for handling key, mouse, etc events.

Method Summary

Modifier and Type	Method	Description
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.
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.
protected int	getItemCount()	Returns the total number of items in this container, including those that are currently hidden because they are out of view.
protected void	layoutChildren(double x, double y, double w, double h)	Called during the layout pass of the scenegraph.
protected Object	queryAccessibleAttribute(AccessibleAttribute attribute, Object... parameters)	This method is called by the assistive technology to request the value for an attribute.
protected void	updateItemCount()	This method is called when it is possible that the item count has changed (i.e.

Methods inherited from class javafx.scene.control.skin.VirtualContainerBase

createVirtualFlow, getVirtualFlow, markItemCountDirty

Methods inherited from class javafx.scene.control.SkinBase

computeBaselineOffset, computeMaxHeight, computeMaxWidth, computeMinHeight, computeMinWidth, consumeMouseEvents, getChildren, getClassCssMetaData, getCssMetaData, getNode, getSkinnable, layoutInArea, layoutInArea, layoutInArea, positionInArea, positionInArea, pseudoClassStateChanged, registerChangeListener, snappedBottomInset, snappedLeftInset, snappedRightInset, snappedTopInset, snapPosition, snapPositionX, snapPositionY, snapSize, snapSizeX, snapSizeY, snapSpace, snapSpaceX, snapSpaceY, unregisterChangeListeners

Methods inherited from class java.lang.Object

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

Constructor Detail

TreeViewSkin

public TreeViewSkin(TreeView control)

Creates a new TreeViewSkin instance, installing the necessary child nodes into the Control children list, as well as the necessary input mappings for handling key, mouse, etc events.

Parameters:

control - The control that this skin should be installed onto.

Method Detail

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<T>

Overrides:

dispose in class SkinBase<TreeView<T>>

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<TreeView<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<TreeView<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

layoutChildren

protected void layoutChildren(double x,
                              double y,
                              double w,
                              double h)

Called during the layout pass of the scenegraph.

Overrides:

layoutChildren in class VirtualContainerBase<TreeView<T>,TreeCell<T>>

Parameters:

x - the x position

y - the y position

w - the width

h - the height

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.

Overrides:

queryAccessibleAttribute in class SkinBase<TreeView<T>>

Parameters:

attribute - the requested attribute

parameters - optional list of parameters

Returns:

the value for the requested attribute

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.

Overrides:

executeAccessibleAction in class SkinBase<TreeView<T>>

Parameters:

action - the action to execute

parameters - optional list of parameters

See Also:

AccessibleAction, Node.executeAccessibleAction(javafx.scene.AccessibleAction, java.lang.Object...)

getItemCount

protected int getItemCount()

Returns the total number of items in this container, including those that are currently hidden because they are out of view.

Specified by:

getItemCount in class VirtualContainerBase<TreeView<T>,TreeCell<T>>

Returns:

the total number of items in this container

updateItemCount

protected void updateItemCount()

This method is called when it is possible that the item count has changed (i.e. scrolling has occurred, the control has resized, etc). This method should recalculate the item count and store that for future use by the VirtualContainerBase.getItemCount() method.

Specified by:

updateItemCount in class VirtualContainerBase<TreeView<T>,TreeCell<T>>