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<font color="#800080">VC知识库（五）</font>
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<font color="#800080">www.vckbase.com</font>
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在ListControl中使用检查框
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<a href="mailto:wyy_cq@188.net">闻怡洋</a>翻译 <a href="http://vchelp.yeah.net">http://vchelp.yeah.net</a>
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<small>
This article was contributed by <a href="mailto:s2848447@t2.technion.ac.il">Eran Yariv</a>.
<p>List Control/View给了界面设计者更多的选择，开发者可以方便的显示列表。下面我们介绍一中带有检查框的ListCtrl，其中你可以得到用户的点击情况以改变选择状态。我们将利用一个CListCtrl的派生类CCheckListBox来实现。</p>
<p>你可以使用OWNER_DRAW风格来自己绘制检查框(我以前翻译过一篇文章是利用改变状态来显示不同IMG，有兴趣可以查查 译者)，还有一种简单的方法是利用IE3中带有的新风格。
</p>
<p>本文介绍一些新的风格，这些可以在VC5或更高版本上使用。</p>
<p>首先我们需要更改CONTROL的风格。</p>
<TT><FONT COLOR="#990000"><PRE>ListView_SetExtendedListViewStyle
(m_lvTestList.m_hWnd, LVS_EX_CHECKBOXES | LVS_EX_FULLROWSELECT);</PRE></FONT></TT>
<p>下面介绍一些新的风格：
<table border=2>
<tr valign=top><td><small>LVS_EX_CHECKBOXES</small></td>
<td><small>使用检查框</small></td>
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<tr valign=top><td><small>LVS_EX_FULLROWSELECT</small></td>
<td><small>选择整行</small></td>
</tr>
<tr valign=top><td><small>LVS_EX_GRIDLINES</small></td><td><small>在REPORT中画出分隔线</small></td>
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<tr valign=top><td><small>LVS_EX_HEADERDRAGDROP</small></td>
<td><small>LVS_REPORT时可以利用drag-and-drop重新排序</small></td>
</tr>
<tr valign=top><td><small>LVS_EX_SUBITEMIMAGES</small></td>
<td><small>允许在子项中显示image</small></td>
</tr>
<tr valign=top><td><small>LVS_EX_TRACKSELECT<small></td>
<td><small>当鼠标指到某一项时便自动选择该项</small></td></tr>
</table>
映射下面的消息：<TT><FONT COLOR="#990000"><PRE>ON_NOTIFY(LVN_ITEMCHANGED, IDC_MYLIST, OnItemchangedLinksList)</PRE></FONT></TT>
<p>得到检查状态</p>
<TT><FONT COLOR="#990000"><PRE><font color="#0000ff">void</font> DemoDlg::OnItemchangedLinksList(NMHDR* pNMHDR, LRESULT* pResult)
{
NM_LISTVIEW* pNMListView = (NM_LISTVIEW*)pNMHDR;
*pResult = 0;
<font color="#0000ff">if</font> (pNMListView->uOldState == 0 && pNMListView->uNewState == 0)
<font color="#0000ff">return</font>; <font color="#009900">// No change</font>
BOOL bPrevState = (BOOL)(((pNMListView->uOldState &
LVIS_STATEIMAGEMASK)>>12)-1); <font color="#009900">// Old check box state</font>
<font color="#0000ff">if</font> (bPrevState < 0) <font color="#009900">// On startup there's no previous state </font>
bPrevState = 0; <font color="#009900">// so assign as false (unchecked)</font>
<font color="#009900">// New check box state</font>
BOOL bChecked=(BOOL)(((pNMListView->uNewState & LVIS_STATEIMAGEMASK)>>12)-1);
<font color="#0000ff">if</font> (bChecked < 0) <font color="#009900">// On non-checkbox notifications assume false</font>
bChecked = 0;
<font color="#0000ff">if</font> (bPrevState == bChecked) <font color="#009900">// No change in check box</font>
<font color="#0000ff">return</font>;
<font color="#009900">// Now bChecked holds the new check box state</font>
<font color="#009900">// ....</font>
}</PRE></FONT></TT>
<p>设置检查框状态</p>
<TT><FONT COLOR="#990000"><PRE><font color="#0000ff">void</font> SetLVCheck (WPARAM ItemIndex, BOOL bCheck)
{
ListView_SetItemState (m_lvTestList.m_hWnd, ItemIndex,
UINT((<font color="#0000ff">int</font>(bCheck) + 1) << 12), LVIS_STATEIMAGEMASK);
}</PRE></FONT></TT>
<p>得到检查框状态</P>
<p>使用在commctl.h中定义的宏 ListView_GetCheckState(hwndLV,i)；hwndLV为CONTROL的句柄，i为位置索引。
</p>
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