I use the scroll bar to figure out the scroll position so that I can paint correctly drop location for drag-n-drop operation.

我使用滚动条找出滚动位置，让我能正确绘制下降的阻力位置，氮拖放操作。

youdao

I use the scroll bar to figure out the scroll position so that I can paint correctly drop location for drag-n-drop operation.

我使用滚动条找出滚动位置，让我能正确绘制下降的阻力位置，氮拖放操作。

youdao