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自定义带选中效果的Command

问题：如何自定义带选中效果的Command

背景：

以设计器对齐方式为例，在点击按钮后，有一个选中的背景色。

有的用户想通过这样的方式去标记点击过的按钮。这个应该怎么实现呢？

实现步骤：

产品的API中有两个接口是用于获取状态和设置状态的，一个是getData另一个是setData。可以用这两个接口来更新按钮的状态。

提到更新按钮的状态，还有一个接口是命令定义中的getState，这个方法可以用来给command返回状态。

简单来说，command点击后或者刷新后，会调用getState，然后将getState返回值，交给component。当与component交互时，会调用command的execute方法，将component的变化更新到状态上，形成一个环。并且所有UI上的持久性状态，都是有对应的data来保持。以上就是一个基本的原理，接下来来看一下这样的command应该如何定义。

在上面的代码中定义了一个叫welcome的command对象，其中有几个属性，第一个是iconClass，这个是用于定义这个command对应的图表的css，也就是这个标签的类，我们在css中就能通过这个类名来添加样式。第二个是execute，用于处理按下按钮的逻辑。在这里面通过setData来处理getState返回的值。第三个是getState，用于返回command自身最新的状态，通过getData获取。

设置完成后，我们的按钮按下之后也会有选中的状态更新。

具体的Demo可以参考：

选中效果command.html

作者: GrapeCity China | 审核：Lynn.Dou | 更新时间：2023.12.28