Interface ICustomUndoRedoFeature

    • Method Summary

      All Methods Instance Methods Abstract Methods 
      Modifier and Type Method Description
      boolean canRedo​(IContext context)
      Decides if the processed feature can be re-done.
      boolean canUndo​(IContext context)
      Decides if the changes done by a processed feature can be undone.
      void postRedo​(IContext context)
      This method will be called by the Graphiti framework after the EMF undo has finished.
      void postUndo​(IContext context)
      This method will be called by the Graphiti framework after the EMF undo is finished.
      void preRedo​(IContext context)
      This method will be called by the Graphiti framework before the EMF undo has triggered.
      void preUndo​(IContext context)
      This method will be called by the Graphiti framework before the EMF undo is triggered.
    • Method Detail

      • canUndo

        boolean canUndo​(IContext context)
        Decides if the changes done by a processed feature can be undone. This method is called once by the Graphiti framework just before any undo work is started, e.g. before preUndo(IContext).

        Note that as soon as any feature reports false here, also all previous entries in the command stack are no longer reachable for undo.

        Note: this method with exactly the same signature is also already part of the IFeature contract. It is repeated here for transparency purposes only.

        Parameters:
        context - this is the instance of the IContext object that was in use when executing the feature.
        Returns:
        true if the feature can be undone, false if not
      • preUndo

        void preUndo​(IContext context)
        This method will be called by the Graphiti framework before the EMF undo is triggered. Customers may revert their non-EMF changes done by the feature here or in postUndo(IContext).
        Parameters:
        context - this is the instance of the IContext object that was in use when executing the feature
      • postUndo

        void postUndo​(IContext context)
        This method will be called by the Graphiti framework after the EMF undo is finished. Customers may revert their non-EMF changes done by the feature here or in preUndo(IContext).
        Parameters:
        context - this is the instance of the IContext object that was in use when executing the feature
      • canRedo

        boolean canRedo​(IContext context)
        Decides if the processed feature can be re-done. This method is called once by the Graphiti framework just before any redo work is started, e.g. before preRedo(IContext).

        Note that as soon as any feature reports false here, also all consecutive entries in the command stack are no longer reachable for redo.

        Parameters:
        context - this is the instance of the IContext object that was in use when executing the feature
        Returns:
        true if the feature can be re-done, false if not
      • preRedo

        void preRedo​(IContext context)
        This method will be called by the Graphiti framework before the EMF undo has triggered. Customers may re-apply their non-EMF changes done by the feature here or in postRedo(IContext). (Usually it might be sufficient to delegate to the execution method of the feature.)
        Parameters:
        context - this is the instance of the IContext object that was in use when executing the feature
      • postRedo

        void postRedo​(IContext context)
        This method will be called by the Graphiti framework after the EMF undo has finished. Customers may re-apply their non-EMF changes done by the feature here or in preRedo(IContext). (Usually it might be sufficient to delegate to the execution method of the feature.)
        Parameters:
        context - this is the instance of the IContext object that was in use when executing the feature