Cancel / Undo Method and System for Editing Tree Structure Data by Hierarchical Menu Inquiry

摘要

PURPOSE:To remarkably reduce memory consumption and a processing time by compressing an undoing data quantity at the time of changing tree structure and furthermore, fusing canceling operation and andoing operation. CONSTITUTION:A cancel data list 600 and an undo data list 700 are prepared and undo data is divided into a cancel type 701 and an uncancel type 702. Changing contents information of tree structure data 500 is set to be difference information of a changing node position, its slave side tree structure, etc. At the time of doing operation, changing contents are added to the cancel data list as cancel data 601 and the cancell type is added to the undo data list. When the cancel type is an object in canceling operation and undoing operation, tree structure is undone by last data in the canceling data list and the piece of data and the changing contents by means of this operation are added to the undo data list. When the uncancel type is an object in undoing operation, tree structure and canceling data are undone by the piece of data.