AbstractDocument.BranchElement (Java 2 Platform SE v1.4.1) - JDK 5 Documentation v1.4.1, Java 2 SDK 英文文档

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Java^TM 2 Platform
Std. Ed. v1.4.1

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javax.swing.text
Class AbstractDocument.BranchElement

java.lang.Object
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  +--javax.swing.text.AbstractDocument.AbstractElement
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        +--javax.swing.text.AbstractDocument.BranchElement

All Implemented Interfaces:: AttributeSet, Element, MutableAttributeSet, Serializable, TreeNode

Direct Known Subclasses:: DefaultStyledDocument.SectionElement, HTMLDocument.BlockElement

Enclosing class:: AbstractDocument

public class AbstractDocument.BranchElement
extends AbstractDocument.AbstractElement

Implements a composite element that contains other elements.

Warning: Serialized objects of this class will not be compatible with future Swing releases. The current serialization support is appropriate for short term storage or RMI between applications running the same version of Swing. As of 1.4, support for long term storage of all JavaBeans^TM has been added to the java.beans package. Please see XMLEncoder.

Nested Class Summary

Nested classes inherited from class javax.swing.text.AttributeSet

AttributeSet.CharacterAttribute, AttributeSet.ColorAttribute, AttributeSet.FontAttribute, AttributeSet.ParagraphAttribute

Field Summary

Fields inherited from interface javax.swing.text.AttributeSet

NameAttribute, ResolveAttribute

Constructor Summary

AbstractDocument.BranchElement(Element parent, AttributeSet a)
          Constructs a composite element that initially contains no children.

Method Summary

Enumeration children()
          Returns the children of the receiver as an Enumeration.

boolean getAllowsChildren()
          Returns true if the receiver allows children.

Element getElement(int index)
          Gets a child element.

int getElementCount()
          Gets the number of children for the element.

int getElementIndex(int offset)
          Gets the child element index closest to the given model offset.

int getEndOffset()
          Gets the ending offset in the model for the element.

String getName()
          Gets the element name.

int getStartOffset()
          Gets the starting offset in the model for the element.

boolean isLeaf()
          Checks whether the element is a leaf.

Element positionToElement(int pos)
          Gets the child element that contains the given model position.

void replace(int offset, int length, Element[] elems)
          Replaces content with a new set of elements.

String toString()
          Converts the element to a string.

Methods inherited from class javax.swing.text.AbstractDocument.AbstractElement

addAttribute, addAttributes, containsAttribute, containsAttributes, copyAttributes, dump, finalize, getAttribute, getAttributeCount, getAttributeNames, getAttributes, getChildAt, getChildCount, getDocument, getIndex, getParent, getParentElement, getResolveParent, isDefined, isEqual, removeAttribute, removeAttributes, removeAttributes, setResolveParent

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractDocument.BranchElement

public AbstractDocument.BranchElement(Element parent,
                                      AttributeSet a)

Constructs a composite element that initially contains no children.
Parameters:: parent - The parent element; a - the attributes for the element

Method Detail

positionToElement

public Element positionToElement(int pos)

Gets the child element that contains the given model position.

Parameters:: pos - the position >= 0
Returns:: the element, null if none

replace

public void replace(int offset,
                    int length,
                    Element[] elems)

Replaces content with a new set of elements.

Parameters:: offset - the starting offset >= 0; length - the length to replace >= 0; elems - the new elements

toString

public String toString()

Converts the element to a string.

Overrides:: toString in class Object

Returns:: the string

getName

public String getName()

Gets the element name.

Specified by:: getName in interface Element
Overrides:: getName in class AbstractDocument.AbstractElement

Returns:: the element name

getStartOffset

public int getStartOffset()

Gets the starting offset in the model for the element.

Specified by:: getStartOffset in interface Element
Specified by:: getStartOffset in class AbstractDocument.AbstractElement

Returns:: the offset >= 0

getEndOffset

public int getEndOffset()

Gets the ending offset in the model for the element.

Specified by:: getEndOffset in interface Element
Specified by:: getEndOffset in class AbstractDocument.AbstractElement

Returns:: the offset >= 0

getElement

public Element getElement(int index)

Gets a child element.

Specified by:: getElement in interface Element
Specified by:: getElement in class AbstractDocument.AbstractElement

Parameters:: index - the child index, >= 0 && < getElementCount()
Returns:: the child element, null if none

getElementCount

public int getElementCount()

Gets the number of children for the element.

Specified by:: getElementCount in interface Element
Specified by:: getElementCount in class AbstractDocument.AbstractElement

Returns:: the number of children >= 0

getElementIndex

public int getElementIndex(int offset)

Gets the child element index closest to the given model offset.

Specified by:: getElementIndex in interface Element
Specified by:: getElementIndex in class AbstractDocument.AbstractElement

Parameters:: offset - the offset >= 0
Returns:: the element index >= 0

isLeaf

public boolean isLeaf()

Checks whether the element is a leaf.

Specified by:: isLeaf in interface Element
Specified by:: isLeaf in class AbstractDocument.AbstractElement

Returns:: true if a leaf

getAllowsChildren

public boolean getAllowsChildren()

Returns true if the receiver allows children.

Specified by:: getAllowsChildren in interface TreeNode
Specified by:: getAllowsChildren in class AbstractDocument.AbstractElement

Returns:: true if the receiver allows children, otherwise false

children

public Enumeration children()

Returns the children of the receiver as an Enumeration.

Specified by:: children in interface TreeNode
Specified by:: children in class AbstractDocument.AbstractElement

Returns:: the children of the receiver