auto scroll

基本解釋

Second, if you want to drag the object to another program, how can the app tell the difference between that and the desire to auto-scroll?
其次，如果你想拖動(dòng)對象到另一個(gè)程序，應(yīng)用程序該如何分辨這種情況與自動(dòng)滾屏呢？收藏。
To cure this, auto-scrolling should begin only after the drag-cursor has been in the auto-scroll zone for some reasonable time cushion—about a half-second.
應(yīng)該只有在拖動(dòng)光標(biāo)進(jìn)入自動(dòng)滾屏敏感帶時(shí)，對時(shí)間進(jìn)行合理緩沖約半秒鐘后再開始啟動(dòng)。
It would be better if the auto-scroll went faster the closer the cursor gets to the edge of the window (though it's also important to have a speed limit—it doesn't help anyone if it goes too fast).
當(dāng)光標(biāo)越來越接近邊界時(shí)，滾屏速度就會(huì)越來越快（所以應(yīng)該對最快速度有一個(gè)限制，速度太快對誰都沒有好處）。

To make this work with auto layout, the meaning of the top, left, bottom, and right edges within a scroll view now mean the edges of its content view.
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