重写MFC treectrl控件的一个实例

///////////////////////////////////////////////////////////// // // Author: Sami (M.ALSAMSAM), ittiger@ittiger.net // // Filename: TreeCtrlEx.cpp // // http : www.ittiger.net // ////////////////////////////////////////////////////////////// #include "stdafx.h" #include "ColorTree.h" #include "TreeCtrlEx.h" #ifdef _DEBUG #undef THIS_FILE static char THIS_FILE[]=__FILE__; #define new DEBUG_NEW #endif ////////////////////////////////// CTreeCtrlEx::CTreeCtrlEx() { } CTreeCtrlEx::~CTreeCtrlEx() { } ////////////////////////////////// IMPLEMENT_DYNAMIC(CTreeCtrlEx, CTreeCtrl) BEGIN_MESSAGE_MAP(CTreeCtrlEx, CTreeCtrl) //{{AFX_MSG_MAP(CTreeCtrlEx) ON_WM_PAINT() //}}AFX_MSG_MAP END_MESSAGE_MAP() ////////////////////////////////////////////////////////////////////// void CTreeCtrlEx::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 CTreeCtrlEx::SetItemBold(HTREEITEM hItem, BOOL bBold) { SetItemState(hItem, bBold ? TVIS_BOLD: 0, TVIS_BOLD); } ////////////////////////////////////////////////////////////////////// void CTreeCtrlEx::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 CTreeCtrlEx::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 CTreeCtrlEx::GetItemBold(HTREEITEM hItem) { return GetItemState(hItem, TVIS_BOLD) & TVIS_BOLD; } ////////////////////////////////////////////////////////////////////// COLORREF CTreeCtrlEx::GetItemColor(HTREEITEM hItem) { // Returns (COLORREF)-1 if color was not set Color_Font cf; if(!m_mapColorFont.Lookup(hItem, cf)) return (COLORREF) - 1; return cf.color; } ////////////////////////////////////////////////////////////////////// void CTreeCtrlEx::OnPaint() { CPaintDC dc(this); // Create a memory DC compatible with the paint DC CDC memDC; memDC.CreateCompatibleDC(&dc); CRect rcClip, rcClient; dc.GetClipBox( &rcClip ); GetClientRect(&rcClient); // Select a compatible bitmap into the memory DC CBitmap bitmap; bitmap.CreateCompatibleBitmap( &dc, rcClient.Width(), rcClient.Height() ); memDC.SelectObject( &bitmap ); // Set clip region to be same as that in paint DC CRgn rgn; rgn.CreateRectRgnIndirect( &rcClip ); memDC.SelectClipRgn(&rgn); rgn.DeleteObject(); // First let the control do its default drawing. CWnd::DefWindowProc(WM_PAINT, (WPARAM)memDC.m_hDC, 0); HTREEITEM hItem = GetFirstVisibleItem(); int iItemCount = GetVisibleCount() + 1; while(hItem && iItemCount--) { CRect rect; // Do not meddle with selected items or drop highlighted items UINT selflag = TVIS_DROPHILITED | TVIS_SELECTED; Color_Font cf; //if ( !(GetTreeCtrl().GetItemState( hItem, selflag ) & selflag ) // && m_mapColorFont.Lookup( hItem, cf )) if ((GetItemState(hItem, selflag) & selflag) && ::GetFocus() == m_hWnd) ; else if (m_mapColorFont.Lookup(hItem, cf)) { CFont *pFontDC; CFont fontDC; LOGFONT logfont; if(cf.logfont.lfFaceName[0] != '\0') logfont = cf.logfont; else { // No font specified, so use window font CFont *pFont = GetFont(); pFont->GetLogFont( &logfont ); } if(GetItemBold(hItem)) logfont.lfWeight = 700; fontDC.CreateFontIndirect(&logfont); pFontDC = memDC.SelectObject(&fontDC ); if(cf.color != (COLORREF) - 1) memDC.SetTextColor(cf.color); else memDC.SetTextColor(GetSysColor(COLOR_WINDOWTEXT)); CString sItem = GetItemText(hItem); GetItemRect(hItem, &rect, TRUE); memDC.SetBkColor( GetSysColor(COLOR_WINDOW)); 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); memDC.DeleteDC(); }