CODEWITHSUNDEEP
javaswingjtextarea
Tomasz Waszczyk
Tomasz Waszczyk

Reputation: 3169

Get a whole history of changes from JTextArea

There is a possibility to get a list of changes in JTextArea in simple way?

I mean that I want to retrieve all text which were typed/showed in JTextArea, something like ReDo/UnDo. Have the possibility to back, like "CTRL + Z"

Upvotes: 2

Views: 259

Answers (2)

Bolesław Denk
Bolesław Denk

Reputation: 573

Back in the days I have used UndoManager to manage swing text component changes.

You can find api here: Oracle JavaDoc UndoManager

And usage example here: Java2s example UndoManager

HTH

Update:

UndoManager extends CompoundEdit which declares a protected Vector "edits" of UndoableEdit objects.

You could get access to that Vector, for listing changes, by writing a class that extends UndoManager and provides public getter metod list getChangesVecor.

Upvotes: 6

Levenal
Levenal

Reputation: 3806

If you are after changes in the text of the area you could try one of the following:

Add some form of listener to the JTextArea and each time the text changes store the information as a String in an arrayList, although if you are expecting anything more than a small amount of changes this solution will likely be highly inefficient.

Probably the better option, store the information in a text file/database. This creates a permanent record/log of the information, and could then be read by future programs if required.

Good luck!

Upvotes: 1

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