The command design pattern 命令设计模式
I am learning command design pattern.
我在学习命令设计模式。
I am learning command design pattern. As far as I know, four terms always associated with the command pattern are command, receiver, invoker and client.
我在学习命令设计模式。据我所知，总是与命令模式相关的四项命令，接收，调用和客户端。
The command design pattern which provides undo-redo operation, is applied to the whole class frame design and several sub-classes design of graphics edit operation.
命令模式的使用包含整个类框架设计和几套图形编辑操作子类设计，支持可以撤销重做的操作。
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