Module java.desktop
Package javax.swing.text

# Class AbstractDocument.DefaultDocumentEvent

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 declared in interface javax.swing.event.DocumentEvent

`DocumentEvent.ElementChange, DocumentEvent.EventType`

## Field Summary

### Fields declared in class javax.swing.undo.CompoundEdit

`edits`

### Fields declared in class javax.swing.undo.AbstractUndoableEdit

`RedoName, UndoName`

## Constructor Summary

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

## Method Summary

Modifier and Type
Method
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. for use as a Redo menu item.
`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. for use as an Undo menu item.
`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 declared in class javax.swing.undo.CompoundEdit

`canRedo, canUndo, die, end, isInProgress, lastEdit`

### Methods declared in class javax.swing.undo.AbstractUndoableEdit

`replaceEdit`

### Methods declared in class java.lang.Object

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

## Constructor Details

### 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 Details

### 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