如何使列表视图在中心显示特定项目? [英] How to make the listview to show a specific item in the center?

问题描述

是否存在一种通用方法将特定列表项(例如1000中的第500个)放在其中心位置?现在，我正在使用此代码:

Is there a universal method of placing a specific item (e.g. 500th from 1000) of the listview right in its center? Now I am using this code:

lvData.Items[iIndex].MakeVisible(False);

这很简单，但有一个缺陷-大多数必需项出现在列表视图的顶部或底部.是的，我知道，手动滚动它没什么大不了，但是我使用它的方式(在图表上选择一个点并在列表视图中查看附近点的值)使此行为有些不适.

It's simple but has one flaw - mostly the required item appears at the top or at the bottom of the listview. Yes I know, it's not a big deal to scroll it manually but the way I use it (selecting a point on the graph and viewing the values of the nearby points in the listview) makes this behavior a little uncomfortable.

推荐答案

您可以使用项目的DisplayRect来确定当前项目的位置. 鉴于ListView1是列表视图，li是列表项，而R是TRect变量

You can use DisplayRect of an item to determine where it currently lives. Given ListView1 is the listview, li is the list item and R is a TRect variable

R := li.DisplayRect(drBounds);
ListView1.Scroll(0, R.Top - ListView1.ClientHeight div 2);

如果有足够的项目，将在中心滚动该项目.

will scroll the item in the center, provided there are enough items.

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