📄 如何给tlistbox加上水平的滚动条.htm
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<div align="center">如何给TListBox加上水平的滚动条? </div>
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<p> Delphi 的 TListBox元件自动实现了垂直的滚动条,当ListBox不能显示全部的菜单(Item)时,这个垂直的滚动条就会出现。然而，当菜单的宽度比ListBox宽时水平的滚动条却不会出现。以下的程序就是处理这个问题的。
<p> 在你的Form的OnCreate事件中添加以下代码： <br>
procedure TForm1.FormCreate(Sender: TObject); <br>
<b>var</b> <br>
i, MaxWidth: integer; <br>
<b>begin</b> <br>
MaxWidth := 0; <br>
<b>for</b> i := 0 <b>to</b> ListBox1.Items.Count - 1 <b>do</b>
<br>
<b>if</b> MaxWidth < ListBox1.Canvas.TextWidth(ListBox1.Items.Strings[i])
<b>then</b> <br>
MaxWidth := ListBox1.Canvas.TextWidth(ListBox1.Items.Strings[i]);
<br>
SendMessage(ListBox1.Handle, LB_SETHORIZONTALEXTENT, MaxWidth+2,
0); <br>
<b>end</b>;
<p> 以上的代码首先得到ListBox中最长Item的长度，然后用LB_SETHORIZONTALEXTENT消息设置ListBox的水平滚动的宽度，宽度加2是为了给右面留2个点的边。
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