MFC edit控件

[lcsmwp]

我用图片作为一对话框背景，再在对话框上放 edti控件，运行后edit部分为白色，我想问一下怎么让edit部分显示对应的背景图片部分，
BRUSH CxxxDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)
这种方法用过了，不行
希望大家帮帮忙

[Eleven]

http://topic.csdn.net/u/20100719/21/ac513990-5236-4f45-a58a-7399fd691556.html
http://blog.csdn.net/fishion/archive/2009/03/14/3990457.aspx

[羽飞]

绘制自己的Edit，OnCtlColor里面又不能画图，自己绘制背景，处理按键消息

[lcsmwp]

不用bmp图片，用png图片 最要好给个能批量处理的方法，因为要用好多edit控件

[lyingbo]

看有没办法把edit弄成透明色

[varding]

1，在oninitialdialog里用createpatternbrush以你的图片作为参数创建brush
2，在onCtrlcolor里返回刚才创建的brush就行了

[pcgg5244]

[C/C++]
HBRUSH CxxxDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)
在OnCtlColor里面:

if(IDC_EDIT1==pWnd->GetDlgCtrlID())
{
CRect rect;
GetWindowRect(&rect);
ScreenToClient(&rect);
static BOOL Init=FALSE;
CDC memDC;
CBitmap bitmap;
if(!Init)
{
memDC.CreateCompatibleDC(pDC);
bitmap.CreateCompatibleBitmap(pDC,rect.Width(),rect.Height());
memDC.SelectObject(&bitmap);
memDC.BitBlt(0,0,rect.Width(),rect.Height(),pDC,0,0,SRCCOPY);
Init=TRUE;
}
else
{
pDC->BitBlt(0,0,rect.Width(),rect.Height(),&memDC,0,0,SCRCOPY);
}
static HBRUSH hbr=::CreatePatternBrush(bitmap);
return hbr;
}
大概是这么写的,我这没编译器,用记事本打的,可能有些拼写错误^^

[pcgg5244]

GetWindowRect(&rect);错了,应该得到EDIT的矩形
pWnd->GetWindowRect(&rect);

[pcgg5244]

还漏了个SetBkMode(TRANSPARENT);

[Fireway2008]

Edit 控件也是窗体类，继承CWnd
所以可以直接在其OnEraseBkgnd（）内用5楼代码做处理贴图即可。

[schlafenhamster]

不好搞的。
1》对话框的背景一般用StretchBlt，这样edit部分的位置和大小难定。
2》对话框画背景时edit部分是Clip掉的，除非edit被hide。
3》如果edit使能scroll那么edit的背景（即对话框的某部分）会scroll而不在原位置）。

[wyx100]

1，在oninitialdialog里用createpatternbrush以你的图片作为参数创建brush
2，在onCtrlcolor里返回刚才创建的brush就行了

[心留]

[Quote=引用 6 楼 pcgg5244 的回复:]
GetWindowRect(&rect);错了,应该得到EDIT的矩形
pWnd->GetWindowRect(&rect);
[/Quote]

问题还是要自己多发现

[schlafenhamster]

给你写了一个例子，不知道你好用否：
1》dlg头：
CDrawEditDlg::~CDrawEditDlg();
CBitmap m_bitmap;
CBrush *m_pbrEd;
BOOL m_blInitEditBr;
1+》
CDrawEditDlg::CDrawEditDlg(CWnd* pParent /*=NULL*/)
: CDialog(CDrawEditDlg::IDD, pParent)
{
//{{AFX_DATA_INIT(CDrawEditDlg)
// NOTE: the ClassWizard will add member initialization here
//}}AFX_DATA_INIT
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
m_bitmap.LoadBitmap(IDB_CLOUDS);
m_pbrEd=0;
m_blInitEditBr=FALSE;
}

2》//
CDrawEditDlg::~CDrawEditDlg()
{
if(m_pbrEd)
{
DeleteObject(m_pbrEd);
delete m_pbrEd;
}
}
3》在第一次EraseBkgnd时生成PatternBrush，注意edit的背景被加上了。

BOOL CDrawEditDlg::OnEraseBkgnd(CDC* pDC) 
{
	// TODO: Add your message handler code here and/or call default
	CDC dcMem;
	dcMem.CreateCompatibleDC(pDC);//DeleteDC needed
	CBitmap* pOldBitmap = dcMem.SelectObject(&m_bitmap);
// Retrieve the size of our bitmap...
	BITMAP bmp;
	m_bitmap.GetObject(sizeof(bmp),&bmp);
// and the size of our window's client area
	CRect rect;
	GetClientRect(&rect);
//	Create Edit background brush; only once !
	if(!m_blInitEditBr)
	{// add  edit rect
		CRgn  prgnClip;
		CRect selEditRc;
		m_SelEdit.GetWindowRect(selEditRc);
		prgnClip.CreateRectRgnIndirect(selEditRc);//DeleteObject needed
		CDC* pDCex=GetDCEx(&prgnClip,DCX_PARENTCLIP);//ReleaseDC needed
	// Fill the client area of dlg,include SelEdit with our bitmap
		pDCex->StretchBlt(rect.left, rect.top,rect.Width(), rect.Height(),
						&dcMem,0, 0, bmp.bmWidth, bmp.bmHeight,SRCCOPY);
 //we create the background brush of SelEdit
		CDC dcMemEd;
		dcMemEd.CreateCompatibleDC(pDCex);//DeleteDC needed
		CBitmap EditBmp;//DeleteObject needed
		EditBmp.CreateCompatibleBitmap(pDCex,selEditRc.Width(),selEditRc.Height());
		pOldBitmap = dcMemEd.SelectObject(&EditBmp);
		ScreenToClient(&selEditRc);
		MapWindowPoints(this,selEditRc);
		dcMemEd.BitBlt(0,0,selEditRc.Width(),selEditRc.Height(),
						pDCex,selEditRc.left, selEditRc.top, SRCCOPY);
		CBitmap  *nowBMP=dcMemEd.SelectObject(pOldBitmap); 
// copy to CB for checking
#ifdef TEST
		OpenClipboard();
		EmptyClipboard(); 
		SetClipboardData(CF_BITMAP,nowBMP->GetSafeHandle());
		CloseClipboard();
#endif
		m_pbrEd=new CBrush;
		m_pbrEd->CreatePatternBrush(nowBMP);
		m_blInitEditBr=TRUE;
//
		DeleteObject(prgnClip);
		DeleteObject(EditBmp);
		ReleaseDC(pDCex);
		dcMemEd.DeleteDC();
	}
	else
	{// MORMAL
		pDC->StretchBlt(rect.left, rect.top,rect.Width(), rect.Height(),
						&dcMem,0, 0, bmp.bmWidth, bmp.bmHeight,SRCCOPY);
	}
	dcMem.SelectObject(pOldBitmap);
	dcMem.DeleteDC(); 
//
	return TRUE;
//	return CDialog::OnEraseBkgnd(pDC);
}

4》要设置SetBkMode
HBRUSH CDrawEditDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor)
{
HBRUSH hbr = CDialog::OnCtlColor(pDC, pWnd, nCtlColor);
// TODO: Change any attributes of the DC here
if((CTLCOLOR_EDIT==nCtlColor) && (*pWnd == m_SelEdit))
{
pDC->SetBkMode(TRANSPARENT);
return 0;
}
return hbr;
}
5》派生Edit （m_SelEdit）CSelEdit
6》注意 Invalidate();
void CSelEdit::OnChange()
{
// TODO: Add your control notification handler code here
Invalidate();
}
7》用PatternBrush刷背景
BOOL CSelEdit::OnEraseBkgnd(CDC* pDC)
{
// TODO: Add your message handler code here and/or call default
CDrawEditDlg *pdlg=(CDrawEditDlg*)GetParent();
CRect rc;
GetWindowRect(&rc);
ScreenToClient(&rc);
// afxDump << rc << "\n";
pDC->FillRect(rc,pdlg->m_pbrEd);
return TRUE;
// return CEdit::OnEraseBkgnd(pDC);
}
8》击键太快时有闪烁。

[schlafenhamster]

下面是使用隐藏edit的方法，略简单些，不再使用pDCex：

BOOL CDrawEditDlg::OnEraseBkgnd(CDC* pDC) 
{
	// TODO: Add your message handler code here and/or call default
// add  edit rect,must here!
	if(!m_blInitEditBr) m_SelEdit.ShowWindow(SW_HIDE);
// normal 
	CDC dcMem;
	dcMem.CreateCompatibleDC(pDC);//DeleteDC needed
	CBitmap* pOldBitmap = dcMem.SelectObject(&m_bitmap);
// Retrieve the size of our bitmap...
	BITMAP bmp;
	m_bitmap.GetObject(sizeof(bmp),&bmp);
// and the size of our window's client area
	CRect rect;
	GetClientRect(&rect);
	pDC->StretchBlt(rect.left, rect.top,rect.Width(), rect.Height(),
					&dcMem,0, 0, bmp.bmWidth, bmp.bmHeight,SRCCOPY);
// 	
	if(!m_blInitEditBr)
	{// Create Edit background brush; only once !
		CRect selEditRc;
		m_SelEdit.GetWindowRect(selEditRc);
//we create the background brush of SelEdit
		CDC dcMemEd;
		dcMemEd.CreateCompatibleDC(pDC);//DeleteDC needed
//
		CBitmap EditBmp;//DeleteObject needed
		EditBmp.CreateCompatibleBitmap(pDC,selEditRc.Width(),selEditRc.Height());
//
		CBitmap* pOld = dcMemEd.SelectObject(&EditBmp);
		ScreenToClient(&selEditRc);
		MapWindowPoints(this,selEditRc);
		dcMemEd.BitBlt(0,0,selEditRc.Width(),selEditRc.Height(),
						pDC,selEditRc.left, selEditRc.top, SRCCOPY);
		CBitmap  *nowBMP=dcMemEd.SelectObject(pOld); 
// copy to CB for checking
#ifdef TEST
		OpenClipboard();
		EmptyClipboard(); 
		SetClipboardData(CF_BITMAP,nowBMP->GetSafeHandle());
		CloseClipboard();
#endif
		m_pbrEd=new CBrush;
		m_pbrEd->CreatePatternBrush(nowBMP);
		m_blInitEditBr=TRUE;
//
		DeleteObject(EditBmp);
		dcMemEd.DeleteDC();
//
		m_SelEdit.ShowWindow(SW_SHOW);
	}
//
	dcMem.SelectObject(pOldBitmap);
	dcMem.DeleteDC(); 
//
	return TRUE;
//	return CDialog::OnEraseBkgnd(pDC);
}

if(!m_blInitEditBr) m_SelEdit.ShowWindow(SW_HIDE);必须在CreateCompatibleDC(pDC)前