public UndoEngine(EditingContext context)
{
this.context = context;
undoBuffer = new List<UndoUnit>(capacity);
redoBuffer = new List<UndoUnit>(capacity);
this.undoEngineImpl = this;
}
public UndoEngine(EditingContext context)
{
this.context = context;
undoBuffer = new List <UndoUnit>(capacity);
redoBuffer = new List <UndoUnit>(capacity);
this.undoEngineImpl = this;
}
// CreateImmediateEditingScope - creates a new ImmediateEditingScope which gatters all edits in its
// undo unit list. all changes in ImmediateEditingScope appear as a one change and can be
// undoned or redoned as a one set.
internal ImmediateEditingScope CreateImmediateEditingScope(string bookmarkName, ModelTreeManager modelTreeManager)
{
Fx.Assert(modelTreeManager != null, "modelTreeManager should not be null.");
//only one bookmark is supported
Fx.Assert(this.bookmark == null, "Nested bookmarks are not supported.");
//create bookmark undo unit, and give it a description
BookmarkUndoUnit unit = new BookmarkUndoUnit(this.context, modelTreeManager)
{
Description = bookmarkName ?? string.Empty,
};
//create bookmark, and pass bookmark undo unit to it.
this.bookmark = new Bookmark(this, unit);
//switch implementation of AddUndoUnit, Undo, Redo to be delegated through bookmark
this.undoEngineImpl = bookmark;
return new ImmediateEditingScope(modelTreeManager, this.bookmark);
}
// CreateImmediateEditingScope - creates a new ImmediateEditingScope which gatters all edits in its
// undo unit list. all changes in ImmediateEditingScope appear as a one change and can be
// undoned or redoned as a one set.
internal ImmediateEditingScope CreateImmediateEditingScope(string bookmarkName, ModelTreeManager modelTreeManager)
{
Fx.Assert(modelTreeManager != null, "modelTreeManager should not be null.");
//only one bookmark is supported
Fx.Assert(this.bookmark == null, "Nested bookmarks are not supported.");
//create bookmark undo unit, and give it a description
BookmarkUndoUnit unit = new BookmarkUndoUnit(this.context, modelTreeManager)
{
Description = bookmarkName ?? string.Empty,
};
//create bookmark, and pass bookmark undo unit to it.
this.bookmark = new Bookmark(this, unit);
//switch implementation of AddUndoUnit, Undo, Redo to be delegated through bookmark
this.undoEngineImpl = bookmark;
return(new ImmediateEditingScope(modelTreeManager, this.bookmark));
}