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Question by StrongLei · Sep 22, 2017 at 09:59 AM · ui source code

Why does Button need to implement IEventSystemHandler?

about UGUI source code inheritance relationship：

Selectable:IEventSystemHandler, ...

Button:Selectable,IEventSystemHandler,...

and other similar ui components:DropDown,Scrollbar,Slider,Toggle,InputField

I don't think IEventSystemHandler is necessary,Is it?

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