Here are some rough examples/explanations of how to implement undo/ redo on an SWT StyledText control:
http://www.java2s.com/Code/Java/SWT-JFace-Eclipse/SWTUndoRedo.htmhttp://java-gui.info/Apress-The.Definitive.Guide.to.SWT.and.JFace/8886final/LiB0099.html (search for the word "undo"
and a simple editor that implements undo/redo: http://www.java2s.com/Tutorial/Java/0280__SWT/Asimpleeditor.htm Cheers Chris On Jun 10, 2011, at 9:03 AM, John J. Boyer wrote:
Susan,Lots of information and good points. BrailleBlaster will have algorithms for making an xml or utd (Universal tactile document) file from the twoviews.The lack of undo in StyledText could be a problem. I am not sure how itcould be added. I think we would have to copy the code and then modify it. This would be a new BrailleBlaster class. I'm not sure what if any problems there would be with doing this. We may have other reasons for doing it, however. We might even contribute the new class back to Eclipse. John On Fri, Jun 10, 2011 at 09:31:14AM -0600, Susan Jolly wrote:I'm not sure this is the right question to be asking at this point. Based on the discussion a few days ago, it seemed that you wanted to somehow associate the text that a StyledText widget edits to what Chris called theother day your "backing store."With its default use, StyledText makes a copy of your input and manages it with its default Content model. Any changes are made to this copy. You can, of course, obtain this possibly changed copy via getText() and do anything you want with it.(The SWT TextEditor example shows how to save it to a file.) However, the copy, changed or not, is obviously not connected to any "backing store." Styled Text also allows you to define your ownContent model by using its setContent().You can add various Listeners including ModifyListener so the StyledText widget will inform you when it makes changes. StyledText doesn't support undo, although you could add it. Of course, if you do allow undo then you might want to add logic to see whether there are any net changes although this would probably be too hard. In my experience, most text editors think you've changed a document if you've done any editing even if in fact you'veeffectively undone all the changes. I've found two articles that are of some help in using the StyledText widget but it's definitely not easy to understand. http://www.eclipse.org/articles/StyledText%201/article1.html http://www.eclipse.org/articles/StyledText%202/article2.html HTH, Susan-- John J. Boyer; President, Chief Software Developer Abilitiessoft, Inc. http://www.abilitiessoft.com Madison, Wisconsin USA Developing software for people with disabilities
