CRichEditCtrl 控件背景透明

[dcrlj]

CRichEditCtrl 控件怎么做透明效果；就是这个控件贴一张背景图 后能看到控件下面的窗口图片

[Eleven]

重载CRichEditCtrl类，在WM_ERASEBKGND消息，贴个背景图片不行吗？？

[Hiiishe]

我做过，为了在我的图形背景上实现所见即所得文字输入，而不是弹出子窗口来输入。
所以拿到一个RichEdit扩展类后改写了

#if !defined(AFX_AUTORICHEDITCTRL_H__C26D1E0E_DD32_11D2_B39F_000092914562__INCLUDED_)
#define AFX_AUTORICHEDITCTRL_H__C26D1E0E_DD32_11D2_B39F_000092914562__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
// AutoRichEditCtrl.h : header file
//

/////////////////////////////////////////////////////////////////////////////
// CAutoRichEditCtrl window

class CAutoRichEditCtrl : public CRichEditCtrl
{
// Construction
public:
	CAutoRichEditCtrl();

// Attributes
public:
	BOOL m_bOwenDraw;

// Operations
public:

// Overrides
	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CAutoRichEditCtrl)
	//}}AFX_VIRTUAL

// Implementation
public:
	long GetSelectionFontSize();
	CString GetSelectionFontName();
	CStringArray m_saFontList;
	void GetSystemFonts(CStringArray &saFontList);
	void SetFontSize(int nPointSize);
	void SetFontName(CString sFontName);
	void SelectColor();
	bool ParagraphIsBulleted();
	void SetParagraphBulleted();
	
	PARAFORMAT GetParagraphFormat();
	
	bool ParagraphIsRight();
	bool ParagraphIsLeft();
	bool ParagraphIsCentered();
	
	void SetParagraphRight();
	void SetParagraphLeft();
	void SetParagraphCenter();
	
	CHARFORMAT GetCharFormat(DWORD dwMask = CFM_COLOR | CFM_FACE | CFM_SIZE | CFM_BOLD | CFM_ITALIC | CFM_UNDERLINE);
	
	bool SelectionIsBold();
	bool SelectionIsItalic();
	bool SelectionIsUnderlined();

	void SetSelectionBold();
	void SetSelectionItalic();
	void SetSelectionUnderlined();

	void SetRTF(CString sRTF);
	CString GetRTF();
	virtual ~CAutoRichEditCtrl();

	// Generated message map functions
protected:
	afx_msg void OnRButtonDown(UINT nFlags, CPoint point);

	DECLARE_MESSAGE_MAP()
private:
		void SetCharStyle(int MASK, int STYLE, int nStart, int nEnd);
		static DWORD CALLBACK CBStreamIn(DWORD dwCookie, LPBYTE pbBuff, LONG cb, LONG *pcb);
		static DWORD CALLBACK CBStreamOut(DWORD dwCookie, LPBYTE pbBuff, LONG cb, LONG* pcb);
		static BOOL CALLBACK CBEnumFonts(LPLOGFONT lplf, LPTEXTMETRIC lptm, DWORD dwType, LPARAM lpData);
public:
	afx_msg void OnCopy() { Copy(); }
	afx_msg void OnCut() { Cut(); }
	afx_msg void OnPaste() { Paste(); }
	afx_msg void OnSelectall() { SetSel(0, -1); }
	afx_msg void OnUndo() { Undo(); }
	afx_msg void OnClear() { Clear(); }
	afx_msg void OnEnRequestresize(NMHDR *pNMHDR, LRESULT *pResult);
	afx_msg HBRUSH CtlColor(CDC* /*pDC*/, UINT /*nCtlColor*/);
	afx_msg BOOL OnEraseBkgnd(CDC* pDC);
	afx_msg HBRUSH OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor);
	afx_msg void OnNcPaint();
	afx_msg int OnCreate(LPCREATESTRUCT lpCreateStruct);
	afx_msg void OnEnUpdate();
};

/////////////////////////////////////////////////////////////////////////////

//{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.

#endif // !defined(AFX_AUTORICHEDITCTRL_H__C26D1E0E_DD32_11D2_B39F_000092914562__INCLUDED_)

[Hiiishe]

// AutoRichEditCtrl.cpp : implementation file
//

#include "stdafx.h"
#include ".\autoricheditctrl.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

#define ID_RICH_UNDO                    101
#define ID_RICH_CUT                     102
#define ID_RICH_COPY                    103
#define ID_RICH_PASTE                   104
#define ID_RICH_CLEAR                   105
#define ID_RICH_SELECTALL               106
//#define ID_RICH_SETFONT                 107

/////////////////////////////////////////////////////////////////////////////
// CAutoRichEditCtrl

CAutoRichEditCtrl::CAutoRichEditCtrl()
: m_bOwenDraw(FALSE)
{
}

CAutoRichEditCtrl::~CAutoRichEditCtrl()
{
}


BEGIN_MESSAGE_MAP(CAutoRichEditCtrl, CRichEditCtrl)
	//{{AFX_MSG_MAP(CAutoRichEditCtrl)
	ON_WM_RBUTTONDOWN()
	ON_COMMAND(ID_RICH_COPY, OnCopy)
	ON_COMMAND(ID_RICH_CUT, OnCut)
	ON_COMMAND(ID_RICH_PASTE, OnPaste)
	ON_COMMAND(ID_RICH_SELECTALL, OnSelectall)
	ON_COMMAND(ID_RICH_UNDO, OnUndo)
	ON_COMMAND(ID_RICH_CLEAR, OnClear)
	//}}AFX_MSG_MAP
	ON_NOTIFY_REFLECT(EN_REQUESTRESIZE, OnEnRequestresize)
	ON_WM_CTLCOLOR_REFLECT()
	ON_WM_ERASEBKGND()
	ON_WM_CTLCOLOR()
	ON_WM_NCPAINT()
	ON_WM_CREATE()
	ON_CONTROL_REFLECT(EN_UPDATE, OnEnUpdate)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CAutoRichEditCtrl message handlers

CString CAutoRichEditCtrl::GetRTF()
{
	// Return the RTF string of the text in the control.
	
	// Stream out here.
	EDITSTREAM es;
	es.dwError = 0;
	es.pfnCallback = CBStreamOut;		// Set the callback

	CString sRTF = "";

	es.dwCookie = (DWORD) &sRTF;	// so sRTF receives the string
	
	StreamOut(SF_RTF, es);			// Call CRichEditCtrl::StreamOut to get the string.
	///

	return sRTF;

}

void CAutoRichEditCtrl::SetRTF(CString sRTF)
{
	// Put the RTF string sRTF into the rich edit control.

	// Read the text in
	EDITSTREAM es;
	es.dwError = 0;
	es.pfnCallback = CBStreamIn;
	es.dwCookie = (DWORD) &sRTF;
	StreamIn(SF_RTF, es);	// Do it.
	
}

/*
	Callback function to stream an RTF string into the rich edit control.
*/
DWORD CALLBACK CAutoRichEditCtrl::CBStreamIn(DWORD dwCookie, LPBYTE pbBuff, LONG cb, LONG *pcb)
{
	// We insert the rich text here.

/*	
	This function taken from CodeGuru.com
	http://www.codeguru.com/richedit/rtf_string_streamin.shtml
	Zafir Anjum
*/

	CString *pstr = (CString *) dwCookie;

	if (pstr->GetLength() < cb)
	{
		*pcb = pstr->GetLength();
		memcpy(pbBuff, (LPCSTR) *pstr, *pcb);
		pstr->Empty();
	}
	else
	{
		*pcb = cb;
		memcpy(pbBuff, (LPCSTR) *pstr, *pcb);
		*pstr = pstr->Right(pstr->GetLength() - cb);
	}
	///

	return 0;
}

/*
	Callback function to stream the RTF string out of the rich edit control.
*/
DWORD CALLBACK CAutoRichEditCtrl::CBStreamOut(DWORD dwCookie, LPBYTE pbBuff, LONG cb, LONG *pcb)
{
	// Address of our string var is in psEntry
	CString *psEntry = (CString*) dwCookie;
	

	CString tmpEntry = "";
	tmpEntry = (CString) pbBuff;

	// And write it!!!
	*psEntry += tmpEntry.Left(cb);

	return 0;
}

bool CAutoRichEditCtrl::SelectionIsBold()
{
	CHARFORMAT cf = GetCharFormat();	
	
	if (cf.dwEffects & CFM_BOLD)
		return true;
	else
		return false;
}

bool CAutoRichEditCtrl::SelectionIsItalic()
{
	CHARFORMAT cf = GetCharFormat();	
	
	if (cf.dwEffects & CFM_ITALIC)
		return true;
	else
		return false;
}

bool CAutoRichEditCtrl::SelectionIsUnderlined()
{
	CHARFORMAT cf = GetCharFormat();	
	
	if (cf.dwEffects & CFM_UNDERLINE)
		return true;
	else
		return false;
}

CHARFORMAT CAutoRichEditCtrl::GetCharFormat(DWORD dwMask)
{
	CHARFORMAT cf;
	cf.cbSize = sizeof(CHARFORMAT);

	cf.dwMask = dwMask;

	GetSelectionCharFormat(cf);

	return cf;
}

void CAutoRichEditCtrl::SetCharStyle(int MASK, int STYLE, int nStart, int nEnd)
{
	CHARFORMAT cf;
	cf.cbSize = sizeof(CHARFORMAT);
	//cf.dwMask = MASK;
	
	GetSelectionCharFormat(cf);
	
	if (cf.dwMask & MASK)	// selection is all the same
	{
		cf.dwEffects ^= STYLE; 
	}
	else
	{
		cf.dwEffects |= STYLE;
	}
	
	cf.dwMask = MASK;

	SetSelectionCharFormat(cf);

}

void CAutoRichEditCtrl::SetSelectionBold()
{
	long start=0, end=0;
	GetSel(start, end);		// Get the current selection

	SetCharStyle(CFM_BOLD, CFE_BOLD, start, end);	// Make it bold
}

void CAutoRichEditCtrl::SetSelectionItalic()
{
	long start=0, end=0;
	GetSel(start, end);

	SetCharStyle(CFM_ITALIC, CFE_ITALIC, start, end);
}

void CAutoRichEditCtrl::SetSelectionUnderlined()
{
	long start=0, end=0;
	GetSel(start, end);

	SetCharStyle(CFM_UNDERLINE, CFE_UNDERLINE, start, end);
}

void CAutoRichEditCtrl::SetParagraphCenter()
{
	PARAFORMAT paraFormat;    
	paraFormat.cbSize = sizeof(PARAFORMAT);
	paraFormat.dwMask = PFM_ALIGNMENT;    
	paraFormat.wAlignment = PFA_CENTER;
	
	SetParaFormat(paraFormat);	// Set the paragraph.
}

void CAutoRichEditCtrl::SetParagraphLeft()
{
	PARAFORMAT paraFormat;
	paraFormat.cbSize = sizeof(PARAFORMAT);
	paraFormat.dwMask = PFM_ALIGNMENT;    
	paraFormat.wAlignment = PFA_LEFT;
	
	SetParaFormat(paraFormat);
}

void CAutoRichEditCtrl::SetParagraphRight()
{
	PARAFORMAT paraFormat;
	paraFormat.cbSize = sizeof(PARAFORMAT);
	paraFormat.dwMask = PFM_ALIGNMENT;    
	paraFormat.wAlignment = PFA_RIGHT;
	
	SetParaFormat(paraFormat);
}

[Hiiishe]

bool CAutoRichEditCtrl::ParagraphIsCentered()
{
	PARAFORMAT pf = GetParagraphFormat();

	if (pf.wAlignment == PFA_CENTER)
		return true;
	else
		return false;
}

bool CAutoRichEditCtrl::ParagraphIsLeft()
{
	PARAFORMAT pf = GetParagraphFormat();

	if (pf.wAlignment == PFA_LEFT)
		return true;
	else
		return false;
}

bool CAutoRichEditCtrl::ParagraphIsRight()
{
	PARAFORMAT pf = GetParagraphFormat();

	if (pf.wAlignment == PFA_RIGHT)
		return true;
	else
		return false;
}

PARAFORMAT CAutoRichEditCtrl::GetParagraphFormat()
{
	PARAFORMAT pf;
	pf.cbSize = sizeof(PARAFORMAT);

	pf.dwMask = PFM_ALIGNMENT | PFM_NUMBERING;    	

	GetParaFormat(pf);

	return pf;
}

void CAutoRichEditCtrl::SetParagraphBulleted()
{
	PARAFORMAT paraformat = GetParagraphFormat();

	if ( (paraformat.dwMask & PFM_NUMBERING) && (paraformat.wNumbering == PFN_BULLET) )
	{
		paraformat.wNumbering = 0;
		paraformat.dxOffset = 0;
		paraformat.dxStartIndent = 0;
		paraformat.dwMask = PFM_NUMBERING | PFM_STARTINDENT | PFM_OFFSET;
	}
	else
	{
		paraformat.wNumbering = PFN_BULLET;
		paraformat.dwMask = PFM_NUMBERING;
		if (paraformat.dxOffset == 0)
		{
			paraformat.dxOffset = 4;
			paraformat.dwMask = PFM_NUMBERING | PFM_STARTINDENT | PFM_OFFSET;
		}
	}
	
	SetParaFormat(paraformat);

}

bool CAutoRichEditCtrl::ParagraphIsBulleted()
{
	PARAFORMAT pf = GetParagraphFormat();

	if (pf.wNumbering == PFN_BULLET)
		return true;
	else
		return false;
}

void CAutoRichEditCtrl::SelectColor()
{
	CColorDialog dlg;

	CHARFORMAT cf = GetCharFormat();

	if (cf.dwEffects & CFE_AUTOCOLOR) cf.dwEffects -= CFE_AUTOCOLOR;

	// Get a color from the common color dialog.
	if( dlg.DoModal() == IDOK )
	{	
		cf.crTextColor = dlg.GetColor();
	}

	cf.dwMask = CFM_COLOR;

	SetSelectionCharFormat(cf);
}

void CAutoRichEditCtrl::SetFontName(CString sFontName)
{
	CHARFORMAT cf = GetCharFormat();

	// Set the font name.
	for (int i = 0; i <= sFontName.GetLength()-1; i++)
		cf.szFaceName[i] = sFontName[i];


	cf.dwMask = CFM_FACE;

	SetSelectionCharFormat(cf);
}

void CAutoRichEditCtrl::SetFontSize(int nPointSize)
{
	CHARFORMAT cf = GetCharFormat();

	nPointSize *= 20;	// convert from to twips
	cf.yHeight = nPointSize;
	
	cf.dwMask = CFM_SIZE;

	SetSelectionCharFormat(cf);
}

void CAutoRichEditCtrl::GetSystemFonts(CStringArray &saFontList)
{
	CDC *pDC = GetDC ();

	EnumFonts (pDC->GetSafeHdc(),NULL,(FONTENUMPROC) CBEnumFonts,(LPARAM)&saFontList);//Enumerate

}

BOOL CALLBACK CAutoRichEditCtrl::CBEnumFonts(LPLOGFONT lplf, LPTEXTMETRIC lptm, DWORD dwType, LPARAM lpData)
{
	// This function was written with the help of CCustComboBox, by Girish Bharadwaj.
	// Available from Codeguru.

	if (dwType == TRUETYPE_FONTTYPE) 
	{
		((CStringArray *) lpData)->Add( lplf->lfFaceName );
	}

	return true;
}

CString CAutoRichEditCtrl::GetSelectionFontName()
{
	CHARFORMAT cf = GetCharFormat();

	CString sName = cf.szFaceName;

	return sName;
}

long CAutoRichEditCtrl::GetSelectionFontSize()
{
	CHARFORMAT cf = GetCharFormat();
	float fScaleTP = 1440.0f/GetDeviceCaps(GetDC()->GetSafeHdc(),LOGPIXELSY);;
	long nSize = cf.yHeight/fScaleTP;

	return nSize;
}

void CAutoRichEditCtrl::OnRButtonDown( UINT nFlags, CPoint point )
{
	//设置为焦点
	SetFocus();
	//创建一个弹出式菜单
	CMenu popmenu;
	popmenu.CreatePopupMenu();
	//添加菜单项目
	popmenu.AppendMenu(0, ID_RICH_UNDO, _T("撤销(&U)"));
	popmenu.AppendMenu(0, MF_SEPARATOR);
	popmenu.AppendMenu(0, ID_RICH_CUT, _T("剪切(&T)"));
	popmenu.AppendMenu(0, ID_RICH_COPY, _T("复制(&C)"));
	popmenu.AppendMenu(0, ID_RICH_PASTE, _T("粘贴(&P)"));
	popmenu.AppendMenu(0, ID_RICH_CLEAR, _T("删除(&L)"));
	popmenu.AppendMenu(0, MF_SEPARATOR);
	popmenu.AppendMenu(0, ID_RICH_SELECTALL, _T("全选(&A)"));
	//popmenu.AppendMenu(0, MF_SEPARATOR);
	//popmenu.AppendMenu(0, ID_RICH_SETFONT, "Select &Font");

	//初始化菜单项
	UINT nUndo=(CanUndo() ? 0 : MF_GRAYED );
	popmenu.EnableMenuItem(ID_RICH_UNDO, MF_BYCOMMAND|nUndo);

	UINT nSel=((GetSelectionType()!=SEL_EMPTY) ? 0 : MF_GRAYED) ;
	popmenu.EnableMenuItem(ID_RICH_CUT, MF_BYCOMMAND|nSel);
	popmenu.EnableMenuItem(ID_RICH_COPY, MF_BYCOMMAND|nSel);
	popmenu.EnableMenuItem(ID_RICH_CLEAR, MF_BYCOMMAND|nSel);

	UINT nPaste=(CanPaste() ? 0 : MF_GRAYED) ;
	popmenu.EnableMenuItem(ID_RICH_PASTE, MF_BYCOMMAND|nPaste);

	//显示菜单
	CPoint pt;
	GetCursorPos(&pt);
	popmenu.TrackPopupMenu(TPM_RIGHTBUTTON, pt.x, pt.y, this);
	popmenu.DestroyMenu();
	CRichEditCtrl::OnRButtonDown(nFlags, point);
}
HBRUSH CAutoRichEditCtrl::CtlColor(CDC* pDC, UINT /*nCtlColor*/)
{
	// TODO:  在此更改 DC 的任何属性

	pDC->SetBkMode(TRANSPARENT);
	return NULL;
}

BOOL CAutoRichEditCtrl::OnEraseBkgnd(CDC* pDC)
{
	// TODO: 在此添加消息处理程序代码和/或调用默认值
	//CRect rt;
	//GetClientRect(rt);
	//pDC->FillSolidRect(rt,RGB(0,255,0));
	//pDC->MoveTo(rt.TopLeft());
	//pDC->LineTo(rt.BottomRight());
	return CRichEditCtrl::OnEraseBkgnd(pDC);
	return FALSE;
}

HBRUSH CAutoRichEditCtrl::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)
{
	HBRUSH hbr = CRichEditCtrl::OnCtlColor(pDC, pWnd, nCtlColor);

	// TODO:  在此更改 DC 的任何属性

	// TODO:  如果默认的不是所需画笔，则返回另一个画笔
	return hbr;
}

void CAutoRichEditCtrl::OnNcPaint()
{
	// TODO: 在此处添加消息处理程序代码
	// 不为绘图消息调用 CRichEditCtrl::OnNcPaint()
	if (m_bOwenDraw)
	{
		CDC* pDC = GetDC();
		CRect rtWindow;
		GetWindowRect(rtWindow);
		int xBorder = GetSystemMetrics(SM_CXSIZEFRAME);
		int yBorder = GetSystemMetrics(SM_CYSIZEFRAME);
		ScreenToClient(rtWindow);
		CPen pen(PS_DOT, 0, RGB(0,0,0));
		CPen* pOldpen = pDC->SelectObject(&pen);
		CGdiObject* pOld = pDC->SelectStockObject(NULL_BRUSH);
		//pDC->Rectangle(rtWindow);
		rtWindow.DeflateRect(xBorder-2, yBorder-2);
		pDC->Rectangle(rtWindow);
		pDC->SelectObject(pOld);
		pDC->SelectObject(pOldpen);
		ReleaseDC(pDC);
		return;
	}
	CRichEditCtrl::OnNcPaint();
}

int CAutoRichEditCtrl::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
	if (CRichEditCtrl::OnCreate(lpCreateStruct) == -1)
		return -1;

	if (m_bOwenDraw)
	{
		SetWindowLong(m_hWnd, GWL_EXSTYLE, GetWindowLong(m_hWnd,GWL_EXSTYLE)|WS_EX_TRANSPARENT); 
	}

	return 0;
}

void CAutoRichEditCtrl::OnEnUpdate()
{
	// TODO:  如果该控件是 RICHEDIT 控件，则它将不会
	// 发送该通知，除非重写 CRichEditCtrl::OnInitDialog()
	// 函数，将 EM_SETEVENTMASK 消息发送到控件，
	// 同时将 ENM_UPDATE 标志“或”运算到 lParam 掩码中。

	// TODO:  在此添加控件通知处理程序代码
}

// 根据文本改变编辑框大小
void CAutoRichEditCtrl::OnEnRequestresize(NMHDR *pNMHDR, LRESULT *pResult)
{
	REQRESIZE *pReqResize = reinterpret_cast<REQRESIZE *>(pNMHDR);
	// TODO:  控件将不发送该通知，除非您重写
	// CRichEditCtrl::OnInitDialog() 函数以发送 EM_SETEVENTMASK 消息
	// 到具有 ENM_REQUESTRESIZE 标志“或”运算到 lParam 掩码中的控件。

	// 根据文本改变编辑框大小
	CRect rtEditBox;
	GetWindowRect(rtEditBox);
	rtEditBox.NormalizeRect();
	RECT rtNew = pReqResize->rc;
	GetParent()->ScreenToClient( rtEditBox );
	rtEditBox.NormalizeRect();
	if (rtEditBox.Height() < (rtNew.bottom +2*GetSystemMetrics(SM_CYSIZEFRAME) - rtNew.top) )
		rtEditBox.bottom = rtNew.bottom + 2*GetSystemMetrics(SM_CYSIZEFRAME);
	MoveWindow(rtEditBox);

	*pResult = 1;
}

[tianhaixin]

学习……

[Hiiishe]

使用这个类创建RICHEDIT，把成员变量m_bOwenDraw设为TRUE就可以了

[dcrlj]

先谢谢楼上的哥们；但好像还没有明白我的意思； 我是想在这个控件上贴一个背景图； 然后使控件和背景图都透明；但能看出图片的在上面的效果； 看到下面的窗口

[dcrlj]

你说的是把下面的背景图贴到CRichEditCtrl控件上面； 但是要看出上面与下面不一样的颜色；最好是直接把它弄透明就OK

[dcrlj]

急用；那位朋友帮忙； 要求图片透；怎么弄；

[Hiiishe]

那就更简单了，得到你的控件的窗口句柄
// Set WS_EX_LAYERED on this window SetWindowLong(hwnd, GWL_EXSTYLE, GetWindowLong(hwnd, GWL_EXSTYLE) | WS_EX_LAYERED);

// Make this window 70% alpha
SetLayeredWindowAttributes(hwnd, 0, (255 * 70) / 100, LWA_ALPHA);

[finder_zhang]

楼主,你说的是透明,还是半透明?
主窗口有一个图,控件也有一个图,控件的图可以看到,再隐约看到下面主窗的图,这种半透明效果?