如何知道GWT ScrollPanel中正在显示哪个元素 [英] How to know which element is being displayed in GWT ScrollPanel

问题描述

有关GWT ScrollPanel的问题.

A question about GWT ScrollPanel.

有什么方法可以确定在ScrollPanel中显示哪个子元素?

Is there any way to determine which child element is being displayed in ScrollPanel?

(当然，ScrollPanel包含具有HTML对象的DecoratorPanel)

(Of course, ScrollPanel contains DecoratorPanel that has HTML object)

推荐答案

AFAIK没有内置功能，DOM和GWT中都没有.

AFAIK there is no built-in functionality to do so, not in DOM nor in GWT.

如果具有固定的高度元素，则可以尝试计算是否显示了某些元素:

If you have fixed height elements you might try to calculate if certain element is shown: Check if element is visible after scrolling

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