Class: UndoSupport

• Inheritance
• Description
• Related information
• Class protocol
  • instance creation
• Instance protocol
  • accessing
  • initialization
  • queries
  • undo & again
• Private classes
• Examples

Inheritance:

   Object
   |
   +--UndoSupport

Package:

stx:libbasic2

Category:

Views-Text

Version:

rev: 1.13 date: 2017/05/22 10:48:18

user: mawalch

file: UndoSupport.st directory: libbasic2

module: stx stc-classLibrary: libbasic2

Author:

(cg@betti)

Description:

Framework for undo & redo.
See concrete usage in EditTextView.


[instance variables:]

[class variables:]

Related information:

Class protocol:

 for: anActionPerformer

 new

Instance protocol:

 actionInfo: aString

 undoLimit

 undoLimit: something

 actionPerformer: something

 initialize

undoLimit := 1000.

 resetHistories

 isInTransaction

 transactionNotEmpty

 addUndo: action

 addUndoFirst: action

 closeTransactionAndAddTo: anUndoList

at the end of an operation, check the individual undo actions
and add them to the given undoList.
(either individually or as a compound undo action).
Check if the new action(s) can be combined with the previous undo action into one
(this is done for individual keystrokes and character-deletions)

 executeActionFrom: doList addUndoTo: unDoList

 hasRedoAction

 hasUndoAction

 lastRedoAction

 lastUndoAction

 nonUndoableDo: aBlock

 redo

 redoActionInfo

 undo

 undoActionInfo

 undoableDo: aBlock

 undoableDo: aBlock info: aString

Private classes:

    CompoundAction

Examples: