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java.lang.Objectorg.eclipse.jface.text.DefaultUndoManager
Standard implementation of IUndoManager
.
It registers with the connected text viewer as text input listener and document listener and logs all changes. It also monitors mouse and keyboard activities in order to partition the stream of text changes into undo-able edit commands.
Since 3.1 this undo manager is a facade to the global operation history.
The usage of IAdaptable
in the JFace
layer has been approved by Platform UI, see: https://bugs.eclipse.org/bugs/show_bug.cgi?id=87669#c9
This class is not intended to be subclassed.
ITextViewer
,
ITextInputListener
,
IDocumentListener
,
IUndoableOperation
,
IOperationHistory
,
MouseListener
,
KeyListener
Field Summary | |
---|---|
protected long |
fPreservedRedoModificationStamp
The document modification stamp for redo. |
protected long |
fPreservedUndoModificationStamp
The document modification stamp for undo. |
Constructor Summary | |
---|---|
DefaultUndoManager(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. |
protected void |
selectAndReveal(int offset,
int length)
Selects and reveals the specified range. |
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 |
Field Detail |
protected long fPreservedUndoModificationStamp
protected long fPreservedRedoModificationStamp
Constructor Detail |
public DefaultUndoManager(int undoLevel)
undoLevel
- the length of this manager's historyMethod Detail |
public void beginCompoundChange()
IUndoManager
endCompoundChange
is called are to be undone in one piece.
beginCompoundChange
in interface IUndoManager
public void endCompoundChange()
IUndoManager
beginCompoundChange
has been finished. All subsequent changes
are considered to be individually undo-able.
endCompoundChange
in interface IUndoManager
public void setMaximalUndoLevel(int undoLevel)
IUndoManager
setMaximalUndoLevel
in interface IUndoManager
undoLevel
- the length of this undo manager's historypublic void connect(ITextViewer textViewer)
IUndoManager
connect
in interface IUndoManager
textViewer
- the viewer the undo manager is connected topublic void disconnect()
IUndoManager
disconnect
in interface IUndoManager
public void reset()
IUndoManager
reset
in interface IUndoManager
public boolean redoable()
IUndoManager
redoable
in interface IUndoManager
true
if at least on text change can be repeatedpublic boolean undoable()
IUndoManager
undoable
in interface IUndoManager
true
if at least one text change can be rolled backpublic void redo()
IUndoManager
redo
in interface IUndoManager
public void undo()
IUndoManager
undo
in interface IUndoManager
protected void selectAndReveal(int offset, int length)
offset
- the offset of the rangelength
- the length of the rangepublic IUndoContext getUndoContext()
IUndoManagerExtension
getUndoContext
in interface IUndoManagerExtension
null
if the undo manager is not connectedIUndoContext
|
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