Java javax.swing.text Class AbstractDocument.DefaultDocumentEvent（JDK8）

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Java™ Platform
Standard Ed. 8

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Method

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Constr |
Method

java.lang.Object
- javax.swing.undo.AbstractUndoableEdit
- - javax.swing.undo.CompoundEdit
  - - javax.swing.text.AbstractDocument.DefaultDocumentEvent

All Implemented Interfaces:

Serializable, DocumentEvent, UndoableEdit

Enclosing class:

AbstractDocument
```
public class AbstractDocument.DefaultDocumentEvent
extends CompoundEdit
implements DocumentEvent
```
Stores document changes as the document is being modified. Can subsequently be used for change notification when done with the document modification transaction. This is used by the AbstractDocument class and its extensions for broadcasting change information to the document listeners.

Nested Class Summary
- Nested classes/interfaces inherited from interface javax.swing.event.DocumentEvent
  DocumentEvent.ElementChange, DocumentEvent.EventType

Field Summary
- Fields inherited from class javax.swing.undo.CompoundEdit
  edits
- Fields inherited from class javax.swing.undo.AbstractUndoableEdit
  RedoName, UndoName

Constructor Summary

Constructors
Constructor and Description
`DefaultDocumentEvent(int offs, int len, DocumentEvent.EventType type)` Constructs a change record.

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`boolean`	`addEdit(UndoableEdit anEdit)` Adds a document edit.
`DocumentEvent.ElementChange`	`getChange(Element elem)` Gets the changes for an element.
`Document`	`getDocument()` Gets the document that sourced the change event.
`int`	`getLength()` Returns the length of the change.
`int`	`getOffset()` Returns the offset within the document of the start of the change.
`String`	`getPresentationName()` Provides a localized, human readable description of this edit suitable for use in, say, a change log.
`String`	`getRedoPresentationName()` Provides a localized, human readable description of the redoable form of this edit, e.g.
`DocumentEvent.EventType`	`getType()` Returns the type of event.
`String`	`getUndoPresentationName()` Provides a localized, human readable description of the undoable form of this edit, e.g.
`boolean`	`isSignificant()` DefaultDocument events are significant.
`void`	`redo()` Redoes a change.
`String`	`toString()` Returns a string description of the change event.
`void`	`undo()` Undoes a change.

Methods inherited from class javax.swing.undo.CompoundEdit
canRedo, canUndo, die, end, isInProgress, lastEdit

Methods inherited from class javax.swing.undo.AbstractUndoableEdit
replaceEdit

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

- Constructor Detail
  - DefaultDocumentEvent
```
public DefaultDocumentEvent(int offs,
                            int len,
                            DocumentEvent.EventType type)
```
    Constructs a change record.
    
    Parameters:
    
    offs - the offset into the document of the change >= 0
    
    len - the length of the change >= 0
    
    type - the type of event (DocumentEvent.EventType)
    
    Since:
    
    1.4
- Method Detail
  - toString
```
public String toString()
```
    Returns a string description of the change event.
    
    Overrides:
    
    toString in class CompoundEdit
    
    Returns:
    
    a string
  - addEdit
```
public boolean addEdit(UndoableEdit anEdit)
```
    Adds a document edit. If the number of edits crosses a threshold, this switches on a hashtable lookup for ElementChange implementations since access of these needs to be relatively quick.
    
    Specified by:
    
    addEdit in interface UndoableEdit
    
    Overrides:
    
    addEdit in class CompoundEdit
    
    Parameters:
    
    anEdit - a document edit record
    
    Returns:
    
    true if the edit was added
    
    See Also:
    
    UndoableEdit.addEdit(javax.swing.undo.UndoableEdit)
  - redo
```
public void redo()
          throws CannotRedoException
```
    Redoes a change.
    
    Specified by:
    
    redo in interface UndoableEdit
    
    Overrides:
    
    redo in class CompoundEdit
    
    Throws:
    
    CannotRedoException - if the change cannot be redone
    
    See Also:
    
    AbstractUndoableEdit.canRedo()
  - undo
```
public void undo()
          throws CannotUndoException
```
    Undoes a change.
    
    Specified by:
    
    undo in interface UndoableEdit
    
    Overrides:
    
    undo in class CompoundEdit
    
    Throws:
    
    CannotUndoException - if the change cannot be undone
    
    See Also:
    
    AbstractUndoableEdit.canUndo()
  - isSignificant
```
public boolean isSignificant()
```
    DefaultDocument events are significant. If you wish to aggregate DefaultDocumentEvents to present them as a single edit to the user place them into a CompoundEdit.
    
    Specified by:
    
    isSignificant in interface UndoableEdit
    
    Overrides:
    
    isSignificant in class CompoundEdit
    
    Returns:
    
    whether the event is significant for edit undo purposes
    
    See Also:
    
    UndoableEdit.isSignificant()
  - getPresentationName
```
public String getPresentationName()
```
    Provides a localized, human readable description of this edit suitable for use in, say, a change log.
    
    Specified by:
    
    getPresentationName in interface UndoableEdit
    
    Overrides:
    
    getPresentationName in class CompoundEdit
    
    Returns:
    
    the description
    
    See Also:
    
    AbstractUndoableEdit.getUndoPresentationName(), AbstractUndoableEdit.getRedoPresentationName()
  - getUndoPresentationName
```
public String getUndoPresentationName()
```
    Provides a localized, human readable description of the undoable form of this edit, e.g. for use as an Undo menu item. Typically derived from getDescription();
    
    Specified by:
    
    getUndoPresentationName in interface UndoableEdit
    
    Overrides:
    
    getUndoPresentationName in class CompoundEdit
    
    Returns:
    
    the description
    
    See Also:
    
    AbstractUndoableEdit.getPresentationName()
  - getRedoPresentationName
```
public String getRedoPresentationName()
```
    Provides a localized, human readable description of the redoable form of this edit, e.g. for use as a Redo menu item. Typically derived from getPresentationName();
    
    Specified by:
    
    getRedoPresentationName in interface UndoableEdit
    
    Overrides:
    
    getRedoPresentationName in class CompoundEdit
    
    Returns:
    
    the description
    
    See Also:
    
    AbstractUndoableEdit.getPresentationName()
  - getType
```
public DocumentEvent.EventType getType()
```
    Returns the type of event.
    
    Specified by:
    
    getType in interface DocumentEvent
    
    Returns:
    
    the event type as a DocumentEvent.EventType
    
    See Also:
    
    DocumentEvent.getType()
  - getOffset
```
public int getOffset()
```
    Returns the offset within the document of the start of the change.
    
    Specified by:
    
    getOffset in interface DocumentEvent
    
    Returns:
    
    the offset >= 0
    
    See Also:
    
    DocumentEvent.getOffset()
  - getLength
```
public int getLength()
```
    Returns the length of the change.
    
    Specified by:
    
    getLength in interface DocumentEvent
    
    Returns:
    
    the length >= 0
    
    See Also:
    
    DocumentEvent.getLength()
  - getDocument
```
public Document getDocument()
```
    Gets the document that sourced the change event.
    
    Specified by:
    
    getDocument in interface DocumentEvent
    
    Returns:
    
    the document
    
    See Also:
    
    DocumentEvent.getDocument()
  - getChange
```
public DocumentEvent.ElementChange getChange(Element elem)
```
    Gets the changes for an element.
    
    Specified by:
    
    getChange in interface DocumentEvent
    
    Parameters:
    
    elem - the element
    
    Returns:
    
    the changes

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Java javax.swing.text Class AbstractDocument.DefaultDocumentEvent（JDK8）

Class AbstractDocument.DefaultDocumentEvent

Nested Class Summary

Nested classes/interfaces inherited from interface javax.swing.event.DocumentEvent

Field Summary

Fields inherited from class javax.swing.undo.CompoundEdit

Fields inherited from class javax.swing.undo.AbstractUndoableEdit

Constructor Summary

Method Summary

Methods inherited from class javax.swing.undo.CompoundEdit

Methods inherited from class javax.swing.undo.AbstractUndoableEdit

Methods inherited from class java.lang.Object

Constructor Detail

DefaultDocumentEvent

Method Detail

toString

addEdit

redo

undo

isSignificant

getPresentationName

getUndoPresentationName

getRedoPresentationName

getType

getOffset

getLength

getDocument

getChange