MFC 静态文本透明重叠

1、改变static的颜色和设为背景透明可以在父窗口的WM_CTLCOLOR中实现将static设为背景透明时，改变该控件的文本将会出现文字重叠的现象。其实设置为透明背景也就是在static重画背景时返回一个空的刷子而已，所以你改变文本并 没有改变上次残留的背景，从而导致重叠现象。为了解决这个问题，我们可以让父窗口重绘此区域。以下是我的解决方法：从 CStatic 继承一个类 CStaticEx增加WM_CTLCOLOR的消息反射(把很多事情留给父窗口处理并不是一件推荐的事，就 让CStaticEx自己处理这件事，这样还可以不影响到其它的static)处理WM_SETTEXT，当文本改变时，重绘父

2、窗口的该控件所在区域/ StaticEx.cpp : implementation file/#include stdafx.h#include StaticEx.h/ CStaticExIMPLEMENT_DYNAMIC(CStaticEx, CStatic)CStaticEx:CStaticEx()CStaticEx:CStaticEx() BEGIN_MESSAGE_MAP(CStaticEx, CStatic)ON_WM_CTLCOLOR_REFLECT() END_MESSAGE_MAP()/ CStaticEx message handlersHBRUSH CStaticEx:Ct

3、lColor(CDC* pDC, UINT /*nCtlColor*/)/ TODO: Change any attributes of the DC herepDC-SetTextColor(RGB(255, 0, 0);/设置文字的颜色 pDC-SetBkMode(TRANSPARENT);/透 明return (HBRUSH):GetStockObject(NULL_BRUSH);/ TODO: Return a non-NULL brush if the parents handler should not be called /return NULL;LRESULT CStaticE

4、x:DefWindowProc(UINT message, WPARAM wParam, LPARAM lParam) / TODO: Add your specialized code here and/or call the base class if(message=WM_SETTEXT) CRectrect;GetWindowRect(&rect);CWnd* pParent = GetParent();if(pParent) pParent-ScreenToClient(&rect);pParent-InvalidateRect(&rect);returnCStatic:DefWindowProc(message, wParam, lParam);/ StaticEx.h : header file/#pragma once/ CStaticExclassCStaticEx : public CStatic DECLARE_DYNAMIC(CStaticEx)public:CStaticEx();virtual CStaticEx();protected:virtual LRESULT DefWindowProc(UINT message, WPARAM wParam, LPARAM lParam);protecte