CTreeCtrlX改变子项字体和颜色CMap

1、在VC+中改变CTreeCtrl子项Item字体和颜色Setting color and font attribute of the item for CTreeCtrl in VC+.翻译Zafir Anjum 的文章Setting color and font attribute for individual items原文通过定义一个继承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C

2、Map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_mapColorFo

3、nthItem = 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.lfFaceName0 = '0'cf.color =

4、color;m_mapColorFonthItem = cf;BOOL CTreeCtrlX:GetItemFont(HTREEITEM hItem, LOGFONT * plogfont)Color_Font cf;if( !m_mapColorFont.Lookup( hItem, cf ) )   return FALSE;if( cf.logfont.lfFaceName0 = '0' )    return FALSE;*plogfont = cf.logfont;return TRUE;BOOL CTreeCtrlX:GetI

5、temBold(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OnPain

6、t()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, rc

7、Client;/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 );/

8、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

9、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; 

10、;    /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 f

11、ontDC;    LOGFONT logfont;    if( cf.logfont.lfFaceName0 != '0' )         /用户定义了字体     logfont = cf.logfont;        else         / 用户没有定义，使用系统

12、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   

13、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&#

14、160;   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 

15、0;  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 );CTre

16、eCtrlX.CPP源代码：/ TreeCtrlX.cpp : implementation file/#include "stdafx.h"#include "CTreeCtrlEX.h"#include "TreeCtrlX.h"#include <afxtempl.h>#ifdef _DEBUG#define new DEBUG_NEW#undef THIS_FILEstatic char THIS_FILE = _FILE_;#endifCMap<void*, void*, Color_Font, Color

17、_Font&>m_mapColorFont;/ CTreeCtrlXCTreeCtrlX:CTreeCtrlX()CTreeCtrlX:CTreeCtrlX()BEGIN_MESSAGE_MAP(CTreeCtrlX, CTreeCtrl)/AFX_MSG_MAP(CTreeCtrlX)ON_WM_PAINT()/AFX_MSG_MAPEND_MESSAGE_MAP()/ CTreeCtrlX message handlersvoid CTreeCtrlX:SetItemFont(HTREEITEM hItem, LOGFONT &logfont)Color_Font c

18、f;if (!m_mapColorFont.Lookup(hItem, cf)cf.color = (COLORREF) - 1;cf.logfont = logfont;m_mapColorFonthItem = 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_m

19、apColorFont.Lookup(hItem, cf)cf.logfont.lfFaceName0 = '0'cf.color = color;m_mapColorFonthItem = cf;BOOL CTreeCtrlX:GetItemFont(HTREEITEM hItem, LOGFONT *plogfont)Color_Font cf;if (!m_mapColorFont.Lookup(hItem, cf)return FALSE;if (cf.logfont.lfFaceName0 = '0')return FALSE;*plogfont =

20、cf.logfont;return TRUE;BOOL CTreeCtrlX:GetItemBold(HTREEITEM hItem)return GetItemState(hItem, TVIS_BOLD)&TVIS_BOLD;COLORREF CTreeCtrlX:GetItemColor(HTREEITEM hItem)Color_Font cf;if (!m_mapColorFont.Lookup(hItem, cf)return (COLORREF)-1;return cf.color;void CTreeCtrlX:OnPaint() CPaintDC dc(this);

21、/ device context for painting/ TODO: Add your message handler code hereCDC memDC;memDC.CreateCompatibleDC(&dc);CRect rcClip, rcClient;dc.GetClipBox(&rcClip);GetClientRect(&rcClient);CBitmap bitmap;bitmap.CreateCompatibleBitmap(&dc, rcClient.Width(), rcClient.Height();memDC.SelectObje

22、ct(&bitmap);CRgn rgn;rgn.CreateRectRgnIndirect(&rcClip);memDC.SelectClipRgn(&rgn);rgn.DeleteObject();CWnd:DefWindowProc(WM_PAINT, (WPARAM)memDC.m_hDC, 0);HTREEITEM hItem = GetFirstVisibleItem();int n = GetVisibleCount() + 1;while (hItem&&n-)CRect rect;UINT setflag = TVIS_DROPHILITED|TVIS_SELECTED;Color_Font cf;if (!(GetI