在PDF Studio中使用面向对象的设计模式实现撤销/重做

Min Zhang, Kehong Wang
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引用次数: 1

摘要

PDF Studio是一个软件包,它提供了一个可视化的设计环境,帮助用户从数据库中创建文本、图像和数据的文档,并生成PDF(可移植文档格式)文件。撤销/重做功能是大多数具有可视化用户界面的软件的常见需求。本文介绍了撤销/重做在该软件包中的实现,并描述了如何将面向对象的设计模式应用于其设计和实现。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Implementing undo/redo in PDF Studio using object-oriented design pattern
PDF Studio is a software package that provides a visual design environment to help a user create a document with text, images and data from a database, and that generates the file in PDF (Portable Document Format). Undo/redo functionality is a common requirement for most software that has a visual user interface. This paper introduces the implementation of undo/redo in this software package and describes how object-oriented design patterns are applied to its design and implementation.
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