[jira] [Updated] (UIMA-769) AnnotationEditor should support undo and redo

["Jörn Kottmann (JIRA)" <de...@uima.apache.org>]

     [ https://issues.apache.org/jira/browse/UIMA-769?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jörn Kottmann updated UIMA-769:
-------------------------------

    Description: 
Modifications in the Annotation Editor should be undone and redone.

To support undo and redo the Annotation Editor needs to track all modifications done to the CAS. That is only possible if the changed event is not triggered, which does not specify what changed. When this event is triggered the history (and redo list) can just be cleaned.

A user might add an annotation accidentally and quickly wants to remove it again. In many tools undo is a commonly used command for this.

  was:Modifications in the Annotation Editor should be undone and redone.


> AnnotationEditor should support undo and redo
> ---------------------------------------------
>
>                 Key: UIMA-769
>                 URL: https://issues.apache.org/jira/browse/UIMA-769
>             Project: UIMA
>          Issue Type: Improvement
>          Components: CasEditor
>    Affects Versions: 2.3
>            Reporter: Jörn Kottmann
>            Assignee: Jörn Kottmann
>            Priority: Minor
>
> Modifications in the Annotation Editor should be undone and redone.
> To support undo and redo the Annotation Editor needs to track all modifications done to the CAS. That is only possible if the changed event is not triggered, which does not specify what changed. When this event is triggered the history (and redo list) can just be cleaned.
> A user might add an annotation accidentally and quickly wants to remove it again. In many tools undo is a commonly used command for this.

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