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 Classes

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

DocumentEvent.ElementChange, DocumentEvent.EventType

Fields

Fields inherited from class javax.swing.undo.CompoundEdit

edits

Fields inherited from class javax.swing.undo.AbstractUndoableEdit

RedoName, UndoName

Constructors

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

Methods

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