ListCtrl控件，如何知道单击的是哪一列

[ken16]

在vc中，用ListCtrl控件，当单击其中某一列是，如何知道单击的是哪一列？
就像windows2000中的任务管理器中，单击其中某一列可以排序。
第一个回答正确的给分。

[feelinn]

我不要分了。

[eggplant]

首先计算出每列的长度，宽度，即使用CRect来定位一个列，根据鼠标单击的位置，即Point是否落在CRect中，就可以判定单击哪一列了。要用CListCtrl和CHeaderCtrl两个类，源码在程序员大本营2000中VC源码，查看有关CListCtrl的即可。

[panda_w]

Detecting column index of the item clicked

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This article was contributed by Zafir Anjum.
The HitTest() function provided by the CListCtrl class returns only the row index of the item that falls under the point being tested. The HitTest() also has the drawback that it fails if the point is not directly over the first column. To determine the row of the item, we use GetItemRect() to get the rectangular bounds of each visible row and use PtInRect() to determine if the point falls within this rectangle. Once we know the row, we use GetColumnWidth() to determine the bounding rect for each cell and then test the point against each of these bounding rectangles.

// HitTestEx - Determine the row index and column index for a point
// Returns - the row index or -1 if point is not over a row
// point - point to be tested.
// col - to hold the column index
int CMyListCtrl::HitTestEx(CPoint &point, int *col) const
{
int colnum = 0;
int row = HitTest( point, NULL );

if( col ) *col = 0;

// Make sure that the ListView is in LVS_REPORT
if( (GetWindowLong(m_hWnd, GWL_STYLE) & LVS_TYPEMASK) != LVS_REPORT )
return row;

// Get the top and bottom row visible
row = GetTopIndex();
int bottom = row + GetCountPerPage();
if( bottom > GetItemCount() )
bottom = GetItemCount();

// Get the number of columns
CHeaderCtrl* pHeader = (CHeaderCtrl*)GetDlgItem(0);
int nColumnCount = pHeader->GetItemCount();

// Loop through the visible rows
for( ;row <= bottom;row++)
{
// Get bounding rect of item and check whether point falls in it.
CRect rect;
GetItemRect( row, &rect, LVIR_BOUNDS );
if( rect.PtInRect(point) )
{
// Now find the column
for( colnum = 0; colnum < nColumnCount; colnum++ )
{
int colwidth = GetColumnWidth(colnum);
if( point.x >= rect.left
&& point.x <= (rect.left + colwidth ) )
{
if( col ) *col = colnum;
return row;
}
rect.left += colwidth;
}
}
}
return -1;
}


Date Last Updated: April 3, 1999

[ken16]

vc中没有自带的函数可以实现这种功能吗？