VC++中改变CTreeCtrl子项Item的字体和颜色

通过定义一个继承CTreeCtrl的类来实现改变子项字体和颜色：

//首先定义一个字体、颜色的结构体：protected:struct Color_Font{COLORREF color;LOGFONT logfont;}; //使用CMap来保存各个Item对应的字体、颜色信息CMap< void*, void*, Color_Font, Color_Font& > m_mapColorFont ;//添加设置字体、颜色、粗体的函数void CTreeCtrlX::SetItemFont(HTREEITEM hItem, LOGFONT& logfont){Color_Font cf;if( !m_mapColorFont.Lookup( hItem, cf ) )cf.color = (COLORREF)-1;cf.logfont = logfont;m_mapColorFont[hItem] = cf;}void CTreeCtrlX::SetItemBold(HTREEITEM hItem, BOOL bBold){SetItemState( hItem, bBold ? TVIS_BOLD: 0, TVIS_BOLD );}void CTreeCtrlX::SetItemColor(HTREEITEM hItem, COLORREF color){Color_Font cf;if( !m_mapColorFont.Lookup( hItem, cf ) )cf.logfont.lfFaceName[0] = '\0';cf.color = color;m_mapColorFont[hItem] = cf;}BOOL CTreeCtrlX::GetItemFont(HTREEITEM hItem, LOGFONT * plogfont){Color_Font cf;if( !m_mapColorFont.Lookup( hItem, cf ) )return FALSE;if( cf.logfont.lfFaceName[0] == '\0' ) return FALSE;*plogfont = cf.logfont;return TRUE;}BOOL CTreeCtrlX::GetItemBold(HTREEITEM hItem){return GetItemState( hItem, TVIS_BOLD ) & TVIS_BOLD;}COLORREF CTreeCtrlX::GetItemColor(HTREEITEM hItem){// Returns (COLORREF)-1 if color was not setColor_Font cf;if( !m_mapColorFont.Lookup( hItem, cf ) )return (COLORREF)-1;return cf.color;}//添加WM_PAINT 信息监控，重载OnPaint()函数来实现绘制afx_msg void CMyTreeCtrl::OnPaint(){//获取当前绘制对象的DCCPaintDC dc(this);// 使用将要绘制的对象的DC创建一个memory DC//memory device context的概念：是在内存中创建一个结构来反映一个显示（屏幕区域、窗口、//打印机等）的表面。可以用来先在内存中准备好要显示的图像，从而实现双缓存，提高刷新//速度减少刷新时产生的闪烁。CDC memDC;//从当前DC创建内存对象memDC.CreateCompatibleDC( &dc );//定义CRect对象，用来确定区域CRect rcClip, rcClient;//获取当前对象的边界区域dc.GetClipBox( &rcClip );//获取当前对象的用户区域GetClientRect(&rcClient);// Select a compatible bitmap into the memory DC//创建一个bmp文件，作为memDC的内容//该文件的大小与用于区域相同CBitmap bitmap;bitmap.CreateCompatibleBitmap( &dc, rcClient.Width(), rcClient.Height() );memDC.SelectObject( &bitmap );// Set clip region to be same as that in paint DC//通过对象的边界区域创建CRgn对象CRgn rgn;rgn.CreateRectRgnIndirect( &rcClip );memDC.SelectClipRgn(&rgn);rgn.DeleteObject();// First let the control do its default drawing.//首先让控件自己进行默认的绘制，绘制到内存中CWnd::DefWindowProc( WM_PAINT, (WPARAM)memDC.m_hDC, 0 );//获取树状控件的第一个节点HTREEITEM hItem = GetFirstVisibleItem();//遍历这棵树int n = GetVisibleCount()+1;while( hItem && n--){CRect rect;// Do not meddle with selected items or drop highlighted items//不对选中的节点和实行拖放功能的节点进行操作UINT selflag = TVIS_DROPHILITED | TVIS_SELECTED;//定义字体、颜色Color_Font cf;//设置字体if ( !(GetItemState( hItem, selflag ) & selflag )&& m_mapColorFont.Lookup( hItem, cf )){CFont *pFontDC;CFont fontDC;LOGFONT logfont;if( cf.logfont.lfFaceName[0] != '\0' ){//用户定义了字体logfont = cf.logfont;}else{// 用户没有定义，使用系统字体CFont *pFont = GetFont();pFont->GetLogFont( &logfont );}//用户是否设定节点为加粗if( GetItemBold( hItem ) )logfont.lfWeight = 700;//创建字体fontDC.CreateFontIndirect( &logfont );pFontDC = memDC.SelectObject( &fontDC );//设置字体颜色if( cf.color != (COLORREF)-1 )memDC.SetTextColor( cf.color );//获取节点文字CString sItem = GetItemText( hItem );//获取节点区域GetItemRect( hItem, &rect, TRUE );//设置背景色为系统色memDC.SetBkColor( GetSysColor( COLOR_WINDOW ) );//向内存中的图片写入内容,为该节点的内容memDC.TextOut( rect.left+2, rect.top+1, sItem );memDC.SelectObject( pFontDC );}hItem = GetNextVisibleItem( hItem );}dc.BitBlt( rcClip.left, rcClip.top, rcClip.Width(), rcClip.Height(), &memDC,rcClip.left, rcClip.top, SRCCOPY );}