How can the view class be scalable?

gkdfmffc

In the program, you need to draw a picture, the picture is relatively long, the length of a page is not enough, and you want the view class to be scalable, what should I do if there is a stretch bar below?

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CScrollView Class

gkdfmffc

I tried, there is still no stretch bar, nor can it be larger than the stretch of a screen, or not :(