Examples of ptolemy.moml.MoMLUndoEntry

ptolemy.moml.MoMLUndoEntry

This is an undo action on the undo/redo stack. The undo/redo stack is stored in an instance of UndoInfoAttribute associated with the top-level of a model. If undo/redo is enabled, a MoMLParser will create entries automatically and put them on the stack whenever it parses MoML. So the easiest mechanism to perform undoable actions is to specify those actions in MoML and issue a MoMLChangeRequest to execute them. An alternative, however, is to create an instance of this class with no MoML, using the single argument constructor, and to override execute() to directly perform the undo. @see MoMLParser @see ptolemy.kernel.undo.UndoStackAttribute @see MoMLChangeRequest @author Neil Smyth and Edward A. Lee @version $Id: MoMLUndoEntry.java,v 1.22 2005/07/08 19:35:40 cxh Exp $ @since Ptolemy II 2.1 @Pt.ProposedRating Yellow (eal) @Pt.AcceptedRating Red (cxh)

                // workspace is required to push an entry
                // on the undo stack. If this is done outside
                // the change request, there is a race condition
                // on the undo, and a deadlock could result if
                // the model is running.
                MoMLUndoEntry newEntry = new MoMLUndoEntry(toplevel,
                        finalUndoMoML);
                UndoStackAttribute undoInfo = UndoStackAttribute
                        .getUndoInfo(toplevel);
                undoInfo.push(newEntry);
            }

            }


            moml.append("</group>\n");


            // Push the undo entry onto the stack
            MoMLUndoEntry undoEntry = new MoMLUndoEntry(composite, moml
                    .toString());
            UndoStackAttribute undoInfo = UndoStackAttribute
                    .getUndoInfo(composite);
            undoInfo.push(undoEntry);
        } catch (Throwable throwable) {

Examples of ptolemy.moml.MoMLUndoEntry

Related Classes of ptolemy.moml.MoMLUndoEntry