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<title>第六章：输入（三）</title>
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<td width="100%"><font size="3" color="#8000FF"><strong><em>第六章：输入（三）</em></strong></font></td>
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<td width="100%" style="background-color: rgb(232,255,254)"><font FACE="宋体" SIZE="3"><p ALIGN="JUSTIFY">列表框（</font><font SIZE="3">ListBox</font><font FACE="宋体" SIZE="3">）和复合列表框（</font><font SIZE="3">ComboBox</font><font FACE="宋体" SIZE="3">）也是我们经常见到的视窗元素，我们从它所列示的条目中选出所需的，两种列表框只是在外观上略有不同，但从本质和操作方法来说它们是很相象的，它们也有一些特殊的属性：</font><font SIZE="3"></p>
<blockquote>
<p ALIGN="JUSTIFY"><font color="#004080">List<font FACE="宋体" SIZE="3">属性，你可以利于该属性象列表框或复合列表框中添加条目，但也可以在程序设计中通过</font>AddItem<font FACE="宋体" SIZE="3">方法添加。</font></font></p>
<p ALIGN="JUSTIFY"><font color="#004080">ListCount<font FACE="宋体" SIZE="3">属性，返回列表框或复合列表框中条目的数目。</font></font></p>
<p ALIGN="JUSTIFY"><font color="#004080">ListIndex<font FACE="宋体" SIZE="3">属性，表示列表框或复合列表框的第几项条目。（从</font>0<font FACE="宋体" SIZE="3">到</font>ListCount-1<font FACE="宋体" SIZE="3">）</font></font></p>
<p ALIGN="JUSTIFY"><font color="#004080">Sorted<font FACE="宋体" SIZE="3">属性，可以通过该属性对列表框或复合列表框中的条目根据字母顺序排序。</font></font></p>
<p ALIGN="JUSTIFY"><font color="#004080">MultiSelect<font FACE="宋体" SIZE="3">属性，</font>0<font FACE="宋体" SIZE="3">表示不能多选，</font>1<font FACE="宋体" SIZE="3">表示简单多选，</font>2<font FACE="宋体" SIZE="3">表示宽展多选，仅限于列表框。</font></font></p>
<p ALIGN="JUSTIFY"><font color="#004080">Columns<font FACE="宋体" SIZE="3">属性，表示条目是以一列显示还是两列显示，仅限于列表框。</font></font></p>
<p ALIGN="JUSTIFY"><font color="#004080">Style</font></font><font FACE="宋体" SIZE="3" color="#004080">属性：表示列表框或复合列表框以何种风格显示，二者参数不同。</font><font FACE="宋体" SIZE="3"></p>
</font>
</blockquote>
<font FACE="宋体" SIZE="3"><p ALIGN="JUSTIFY">举两个简单的例子。</p>
<p ALIGN="JUSTIFY">例子一，建立一个新项目文件，在</font><font SIZE="3">Form1</font><font FACE="宋体" SIZE="3">上添加一个</font><font SIZE="3">List</font><font FACE="宋体" SIZE="3">控件，调整适当的尺寸，无需改变任何属性。填写以下代码。</font><font SIZE="3"></p>
<p ALIGN="JUSTIFY"><em><strong><font color="#004080">Private Sub Form_Load()</font></strong></em></p>
<blockquote>
<p ALIGN="JUSTIFY"><em><strong><font color="#004080">With List1</font></strong></em></p>
<blockquote>
<p ALIGN="JUSTIFY"><em><strong><font color="#004080">.AddItem "0-Default"<br>
.AddItem "1-Arrow"<br>
.AddItem "2-Cross"<br>
.AddItem "3-I-Beam"<br>
.AddItem "4-Icon"<br>
.AddItem "5-Size"<br>
.AddItem "6-Size NE SW"<br>
.AddItem "7-Size NS"<br>
.AddItem "8-Size NW SE"<br>
.AddItem "9-Size WE"<br>
.AddItem "10-Up Arrow"<br>
.AddItem "11-Hourglass"<br>
.AddItem "12-NoDrag"<br>
.AddItem "13-Arrow And Hourglass"<br>
.AddItem "14-Arrow And Question"<br>
.AddItem "15-Size All"</font></strong></em></p>
</blockquote>
<p ALIGN="JUSTIFY"><em><strong><font color="#004080">End With</font></strong></em></p>
</blockquote>
<p ALIGN="JUSTIFY"><em><strong><font color="#004080">End Sub</font></strong></em></p>
<p ALIGN="JUSTIFY"> </p>
<p ALIGN="JUSTIFY"><em><strong><font color="#004080">Private Sub List1_Click()</font></strong></em></p>
<blockquote>
<p ALIGN="JUSTIFY"><em><strong><font color="#004080" SIZE="3">MousePointer =
List1.ListIndex</font><font color="#008040">’<font FACE="宋体" SIZE="3">这里的</font>MousePointer<font FACE="宋体" SIZE="3">是窗体全局内的属性</font></font></strong></em></p>
</blockquote>
<p ALIGN="JUSTIFY"><em><strong><font color="#004080">End Sub</font></strong></em></font><font FACE="宋体" SIZE="3"></p>
<p ALIGN="JUSTIFY">当你点在不同项上面鼠标指针也会随着改变，如图</font><font SIZE="3">6</font><font FACE="宋体" SIZE="3">－</font><font SIZE="3">14</font><font FACE="宋体" SIZE="3">。</font><font SIZE="3"></p>
<p ALIGN="JUSTIFY"><img src="0614.gif" alt="0614.gif (3321 字节)" WIDTH="320" HEIGHT="240"></p>
<p ALIGN="JUSTIFY">AddItem</font><font FACE="宋体" SIZE="3">方法语法如下：</font><font SIZE="3"></p>
<blockquote>
<p ALIGN="JUSTIFY"><em><strong><font color="#FF0000">ListObject “<font FACE="宋体" SIZE="3">字符串</font>”,</font></font><font FACE="宋体" SIZE="3" color="#FF0000">数值</font></strong></em><font FACE="宋体" SIZE="3"></p>
</font>
</blockquote>
<font FACE="宋体" SIZE="3"><p ALIGN="JUSTIFY">字符串后的数值可以指定条目加入在第几个条目的位置上，如果没有的话，添加项将逐次排下去。</p>
<p ALIGN="JUSTIFY">下面举一个复合列表框的例子，例子通过选择复合列表框中的选项来改变文本框的字体。请新建一个项目文件，在窗体中添加一个</font><font SIZE="3">ComboBox</font><font FACE="宋体" SIZE="3">（</font><font SIZE="3">Combo1</font><font FACE="宋体" SIZE="3">）和一个</font><font SIZE="3">TextBox</font><font FACE="宋体" SIZE="3">（</font><font SIZE="3">Text1</font><font FACE="宋体" SIZE="3">），添加如下代码。</font><font SIZE="3"></p>
<p ALIGN="JUSTIFY"><em><strong><font color="#004080">Private Sub Combo1_Click()</font></strong></em></p>
<blockquote>
<p ALIGN="JUSTIFY"><em><strong><font color="#004080">Text1.FontName =
Combo1.List(Combo1.ListIndex)</font></strong></em></p>
</blockquote>
<p ALIGN="JUSTIFY"><em><strong><font color="#004080">End Sub</font></strong></em></p>
<p ALIGN="JUSTIFY"> </p>
<p ALIGN="JUSTIFY"><em><strong><font color="#004080">Private Sub Form_Load()</font></strong></em></p>
<blockquote>
<p ALIGN="JUSTIFY"><em><strong><font color="#004080">With Combo1</font></strong></em></p>
<blockquote>
<p ALIGN="JUSTIFY"><em><strong><font color="#004080" SIZE="3">.AddItem "</font><font FACE="宋体" SIZE="3" color="#004080">宋体</font><font color="#004080" SIZE="3">"<br>
.AddItem "</font><font FACE="宋体" SIZE="3" color="#004080">隶书</font><font color="#004080" SIZE="3">"<br>
.AddItem "</font><font FACE="宋体" SIZE="3" color="#004080">黑体</font><font color="#004080" SIZE="3">"<br>
.AddItem "</font><font FACE="宋体" SIZE="3" color="#004080">楷体</font><font color="#004080" SIZE="3">"</font><br>
<font color="#004080">.ListIndex = 0</font><font color="#008040">'把第一个条目作为初始项</font></strong></em></p>
</blockquote>
<p ALIGN="JUSTIFY"><em><strong><font color="#004080">End With</font></strong></em></p>
<p ALIGN="JUSTIFY"><em><strong><font color="#004080" SIZE="3">Text1.FontSize = 30</font><font color="#008000">’<font FACE="宋体" SIZE="3">放大字体</font></font><br>
<font color="#004080" SIZE="3">Text1.FontName = Combo1.List(0)</font><font color="#008040">’<font FACE="宋体" SIZE="3">初始字体为“宋体”</font></font></strong></em></p>
</blockquote>
<p ALIGN="JUSTIFY"><em><strong><font color="#004080">End Sub</font></strong></em></font><font FACE="宋体" SIZE="3"></p>
<p ALIGN="JUSTIFY">如图</font><font SIZE="3">6</font><font FACE="宋体" SIZE="3">－</font><font SIZE="3">15</font><font FACE="宋体" SIZE="3">。</p>
<p ALIGN="JUSTIFY"><img src="0615.gif" alt="0615.gif (2935 字节)" WIDTH="320" HEIGHT="240"></p>
<p>（第六章完）</font></td>
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