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Eclipse Platform
Release 3.5

org.eclipse.jface.text
Class TextViewerUndoManager

java.lang.Object
  extended by 
org.eclipse.jface.text.TextViewerUndoManager
All Implemented Interfaces:
IUndoManager, IUndoManagerExtension

public class TextViewerUndoManager
extends Object
implements IUndoManager, IUndoManagerExtension

Implementation of IUndoManager using the shared document undo manager.

It registers with the connected text viewer as text input listener, and obtains its undo manager from the current document. It also monitors mouse and keyboard activities in order to partition the stream of text changes into undo-able edit commands.

This class is not intended to be subclassed.

Since:
3.2
See Also:
ITextViewer, ITextInputListener, IDocumentUndoManager, MouseListener, KeyListener, DocumentUndoManager
Restriction:
This class is not intended to be subclassed by clients.

Constructor Summary
TextViewerUndoManager (int undoLevel)
          Creates a new undo manager who remembers the specified number of edit commands.
 
Method Summary
 void beginCompoundChange ()
          Signals the undo manager that all subsequent changes until endCompoundChange is called are to be undone in one piece.
 void connect ( ITextViewer textViewer)
          Connects this undo manager to the given text viewer.
 void disconnect ()
          Disconnects this undo manager from its text viewer.
 void endCompoundChange ()
          Signals the undo manager that the sequence of changes which started with beginCompoundChange has been finished.
  IUndoContext getUndoContext ()
          Returns this undo manager's undo context.
 void redo ()
          Repeats the most recently rolled back text change.
 boolean redoable ()
          Returns whether at least one text change can be repeated.
 void reset ()
          Resets the history of the undo manager.
 void setMaximalUndoLevel (int undoLevel)
          The given parameter determines the maximal length of the history remembered by the undo manager.
 void undo ()
          Rolls back the most recently executed text change.
 boolean undoable ()
          Returns whether at least one text change can be rolled back.
 
Methods inherited from class java.lang. Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

TextViewerUndoManager

public TextViewerUndoManager(int undoLevel)
Creates a new undo manager who remembers the specified number of edit commands.

Parameters:
undoLevel - the length of this manager's history
Method Detail

beginCompoundChange

public void beginCompoundChange()
Description copied from interface: IUndoManager
Signals the undo manager that all subsequent changes until endCompoundChange is called are to be undone in one piece.

Specified by:
beginCompoundChange in interface IUndoManager

endCompoundChange

public void endCompoundChange()
Description copied from interface: IUndoManager
Signals the undo manager that the sequence of changes which started with beginCompoundChange has been finished. All subsequent changes are considered to be individually undo-able.

Specified by:
endCompoundChange in interface IUndoManager

setMaximalUndoLevel

public void setMaximalUndoLevel(int undoLevel)
Description copied from interface: IUndoManager
The given parameter determines the maximal length of the history remembered by the undo manager.

Specified by:
setMaximalUndoLevel in interface IUndoManager
Parameters:
undoLevel - the length of this undo manager's history

connect

public void connect(
ITextViewer textViewer)
Description copied from interface: IUndoManager
Connects this undo manager to the given text viewer.

Specified by:
connect in interface IUndoManager
Parameters:
textViewer - the viewer the undo manager is connected to

disconnect

public void disconnect()
Description copied from interface: IUndoManager
Disconnects this undo manager from its text viewer. If this undo manager hasn't been connected before this operation has no effect.

Specified by:
disconnect in interface IUndoManager

reset

public void reset()
Description copied from interface: IUndoManager
Resets the history of the undo manager. After that call, there aren't any undo-able or redo-able text changes.

Specified by:
reset in interface IUndoManager

redoable

public boolean redoable()
Description copied from interface: IUndoManager
Returns whether at least one text change can be repeated. A text change can be repeated only if it was executed and rolled back.

Specified by:
redoable in interface IUndoManager
Returns:
true if at least on text change can be repeated

undoable

public boolean undoable()
Description copied from interface: IUndoManager
Returns whether at least one text change can be rolled back.

Specified by:
undoable in interface IUndoManager
Returns:
true if at least one text change can be rolled back

redo

public void redo()
Description copied from interface: IUndoManager
Repeats the most recently rolled back text change.

Specified by:
redo in interface IUndoManager

undo

public void undo()
Description copied from interface: IUndoManager
Rolls back the most recently executed text change.

Specified by:
undo in interface IUndoManager

getUndoContext

public 
IUndoContext getUndoContext()
Description copied from interface: IUndoManagerExtension
Returns this undo manager's undo context.

Specified by:
getUndoContext in interface IUndoManagerExtension
Returns:
the undo context or null if the undo manager is not connected
See Also:
IUndoContext

Eclipse Platform
Release 3.5

Guidelines for using Eclipse APIs.

Copyright (c) Eclipse contributors and others 2000, 2008. All rights reserved.


 
 
  Published under the terms of the Eclipse Public License Version 1.0 ("EPL") Design by Interspire