<b>VC中给树形控件的图标加上工具提示</b>

类声明中的代码如下所示：

// Overrides

// ClassWizard generated

virtual function overrides

//{{AFX_VIRTUAL(CTreeCtrlX)

protected:

…

virtual int OnToolHitTest

( CPoint point, TOOLINFO* pTI ) const;

//}}AFX_VIRTUAL

实现代码如下所示：

int CTreeCtrlX::OnToolHitTest

(CPoint point, TOOLINFO * pTI) const

{

RECT rect;

UINT nFlags;

HTREEITEM hitem = HitTest( point, &nFlags );

if( nFlags & TVHT_ONITEMICON )

{

CImageList *pImg = GetImageList( TVSIL_NORMAL );

IMAGEINFO imageinfo;

pImg- >GetImageInfo( 0, &imageinfo );

GetItemRect( hitem, &rect, TRUE );

rect.right = rect.left - 2;

rect.left -= (imageinfo.rcImage.right + 2);

pTI- >hwnd = m_hWnd;

pTI- >uId = (UINT)hitem;

pTI- >lpszText = LPSTR_TEXTCALLBACK;