public class TextViewerUndoManager extends Object implements IUndoManager, IUndoManagerExtension
IUndoManager using the shared
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.
ITextViewer,
ITextInputListener,
IDocumentUndoManager,
MouseListener,
KeyListener,
DocumentUndoManager| Constructor and Description |
|---|
TextViewerUndoManager(int undoLevel)
Creates a new undo manager who remembers the specified number of edit commands.
|
| Modifier and Type | Method and Description |
|---|---|
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.
|
public TextViewerUndoManager(int undoLevel)
undoLevel - the length of this manager's historypublic void beginCompoundChange()
IUndoManagerendCompoundChange is called are to be undone in one piece.beginCompoundChange in interface IUndoManagerpublic void endCompoundChange()
IUndoManagerbeginCompoundChange has been finished. All subsequent changes
are considered to be individually undo-able.endCompoundChange in interface IUndoManagerpublic void setMaximalUndoLevel(int undoLevel)
IUndoManagersetMaximalUndoLevel in interface IUndoManagerundoLevel - the length of this undo manager's historypublic void connect(ITextViewer textViewer)
IUndoManagerconnect in interface IUndoManagertextViewer - the viewer the undo manager is connected topublic void disconnect()
IUndoManagerdisconnect in interface IUndoManagerpublic void reset()
IUndoManagerreset in interface IUndoManagerpublic boolean redoable()
IUndoManagerredoable in interface IUndoManagertrue if at least on text change can be repeatedpublic boolean undoable()
IUndoManagerundoable in interface IUndoManagertrue if at least one text change can be rolled backpublic void redo()
IUndoManagerredo in interface IUndoManagerpublic void undo()
IUndoManagerundo in interface IUndoManagerpublic IUndoContext getUndoContext()
IUndoManagerExtensiongetUndoContext in interface IUndoManagerExtensionnull if the undo manager is not connectedIUndoContextGuidelines for using Eclipse APIs. Copyright (c) IBM Corp. and others 2000, 2006. All rights reserved.