按鈕這個控件在軟件中使用是非常廣泛的,特別是基於MFC開發,按鈕提供了很好的便捷。
但是在eVC下的按鈕顯示效果是非常土的,且背景顏色不好改。如果裁系統的時候將XP風格裁進去的話,默認按鈕效果會好一些,但是背景顏色不好控制,在ce平臺下,沒有鼠標是很正常的,帶XP風格的CE系統按鈕提示不夠明顯,這個時候就需要自繪按鈕了。
首先,先建立一個基於CWnd的類,如:CMyButton : public CWnd
1、添加成員變量:
CDC m_dcBack;
CBitmap m_bmpBack; //背景
COLORREF m_clNorBack; //正常時背景顏色
COLORREF m_clFocBack; //設上焦點時背景顏色
COLORREF m_clNorText;
COLORREF m_clFocText;
bool m_bLastState; //最後一次狀態,true =焦點
CString m_strTitleInfo; //按鈕上字符
2、添加成員函數:
void InitMyButton(); //初始化按鈕
void DrawBackForNor(); //默認
void DrawBackForFoc(); //按下去
void DrawBackForMid(); //中間
BOOL CreateBTN(LPCTSTR lpszWindowName, DWORD dwStyle, const RECT& rect,
CWnd* pParentWnd, UINT nID,LPDealWithBTN lpDealWithBTN = NULL);//創建
void SetWindowText(LPCTSTR lpszString);//重載函數
BOOL EnableWindow(BOOL bEnable = TRUE);//重載函數
3、在View裏添加消息: 如果考慮到右鍵效果,可以參考LBUTTONDOWN()添加
ON_WM_SETFOCUS()
ON_WM_KILLFOCUS()
ON_WM_PAINT()
ON_WM_LBUTTONDOWN()
ON_WM_ENABLE()
上面的工作已經將基本工作完成了。接下來就是完成相應的代碼了:
{
// CPaintDC dc(this); // device context for painting
// TODO: Add your message handler code here
CPaintDC dc(this); // device context for painting
// TODO: Add your message handler code here
CRect rectClient;
GetClientRect(rectClient);
CDC memDC ;
CBitmap memBitmap ;
CBitmap* oldBitmap ;
memDC.CreateCompatibleDC(&dc) ;
memBitmap.CreateCompatibleBitmap(&dc, rectClient.Width(), rectClient.Height()) ;
oldBitmap = (CBitmap *)memDC.SelectObject(&memBitmap) ;
//將m_dcCoor和m_dcLine繪製到控件上
if (memDC.GetSafeHdc() != NULL)
{
memDC.BitBlt(0, 0, rectClient.Width(), rectClient.Height(),
&m_dcBack, 0, 0, SRCCOPY) ;
dc.BitBlt(0, 0, rectClient.Width(), rectClient.Height(),
&memDC, 0, 0, SRCCOPY) ;
}
memDC.SelectObject(oldBitmap) ;
//刪除內存位圖GDI對象
memBitmap.DeleteObject();
//刪除內存繪圖環境
memDC.DeleteDC();
// Do not call CWnd::OnPaint() for painting messages
}
CWnd* pParentWnd, UINT nID,LPDealWithBTN lpDealWithBTN/* = NULL*/)
{
// TODO: Add your specialized code here and/or call the base class
BOOL bresult ;
//註冊窗體類
static CString className = AfxRegisterWndClass(CS_HREDRAW | CS_VREDRAW);
//創建窗體類
bresult = CWnd::CreateEx(NULL, className, NULL, dwStyle,
rect.left, rect.top, rect.right-rect.left, rect.bottom-rect.top,
pParentWnd->GetSafeHwnd(), (HMENU)nID) ;
//更新窗體顯示
if (bresult != 0)
{
m_strTitleInfo = lpszWindowName;
m_lpDealWithBTN = lpDealWithBTN;
InitMyButton();
DrawBackForNor();
}
return TRUE;
// return CWnd::Create(lpszClassName, lpszWindowName, dwStyle, rect, pParentWnd, nID, pContext);
}
void CMyButton::InitMyButton()
{
CClientDC dc(this);
// CBrush brushBack;
CRect rect;
GetClientRect(rect);
// brushBack.CreateSolidBrush(m_clNorBack) ;
//創建畫線設備環境以及創建相應緩衝區
if (m_dcBack.GetSafeHdc() == NULL)
{
m_dcBack.CreateCompatibleDC(&dc) ;
m_bmpBack.CreateCompatibleBitmap(&dc, rect.Width(), rect.Height()) ;
m_dcBack.SelectObject(&m_bmpBack) ;
}
m_dcBack.SetBkColor (m_clNorBack) ;
m_dcBack.FillSolidRect(rect,m_clNorBack);
}
{
CBrush bRushBack(m_clFocBack);
CBrush *OldBrush = m_dcBack.SelectObject(&bRushBack);
CPen penBlack;
penBlack.CreatePen(PS_SOLID,1,RGB(0,0,0));
CPen *penOld = m_dcBack.SelectObject(&penBlack);
CRect rect;
GetClientRect(&rect);
m_dcBack.FillSolidRect(rect,RGB(192,192,192));
// rect.DeflateRect(5,5);
m_dcBack.RoundRect(rect,CPoint(4,4));
m_dcBack.SelectObject(OldBrush);
m_dcBack.SelectObject(penOld);
bRushBack.DeleteObject();
penBlack.DeleteObject();
int nLenthBuf = WideCharToMultiByte(CP_ACP,0,m_strTitleInfo,-1,NULL,0,NULL,NULL) - 1;
LONG lLeftX = rect.left + (rect.Width() - nLenthBuf * 6) / 2;
LONG lLeftY = rect.top + (rect.Height() - 14) / 2;
m_dcBack.SetBkColor(m_clFocBack);
m_dcBack.SetTextColor(m_clFocText);
m_dcBack.ExtTextOut(lLeftX,lLeftY,ETO_OPAQUE,NULL,m_strTitleInfo,NULL);
Invalidate(FALSE);
m_bLastState = true;
}
void CMyButton::DrawBackForMid()
{
CBrush bRushBack(RGB(230,230,207));
CBrush *OldBrush = m_dcBack.SelectObject(&bRushBack);
CPen penBlack;
penBlack.CreatePen(PS_SOLID,1,RGB(128,128,128));
CPen *penOld = m_dcBack.SelectObject(&penBlack);
CRect rect;
GetClientRect(&rect);
m_dcBack.FillSolidRect(rect,RGB(192,192,192));
// rect.DeflateRect(5,5);
m_dcBack.RoundRect(rect,CPoint(4,4));
m_dcBack.SelectObject(OldBrush);
m_dcBack.SelectObject(penOld);
bRushBack.DeleteObject();
penBlack.DeleteObject();
int nLenthBuf = WideCharToMultiByte(CP_ACP,0,m_strTitleInfo,-1,NULL,0,NULL,NULL) - 1;
LONG lLeftX = rect.left + (rect.Width() - nLenthBuf * 6) / 2;
LONG lLeftY = rect.top + (rect.Height() - 14) / 2;
m_dcBack.SetBkColor(RGB(230,230,207));
m_dcBack.SetTextColor(RGB(128,128,128));
m_dcBack.ExtTextOut(lLeftX,lLeftY,ETO_OPAQUE,NULL,m_strTitleInfo,NULL);
Invalidate(FALSE);
}
//normal
void CMyButton::DrawBackForNor()
{
CRect rect;
GetClientRect(&rect);
CBrush bRushBack(m_clNorBack);
CBrush *OldBrush = m_dcBack.SelectObject(&bRushBack);
CPen penBlack;
penBlack.CreatePen(PS_SOLID,2,RGB(100,100,192));
CPen *penOld = m_dcBack.SelectObject(&penBlack);
m_dcBack.FillSolidRect(rect,RGB(192,192,192));
//rect.DeflateRect(5,5);
// m_dcBack.RoundRect(rect,CPoint(4,4));
m_dcBack.FillSolidRect(rect,RGB(100,100,192));
m_dcBack.SelectObject(OldBrush);
m_dcBack.SelectObject(penOld);
bRushBack.DeleteObject();
penBlack.DeleteObject();
int nLenthBuf = WideCharToMultiByte(CP_ACP,0,m_strTitleInfo,-1,NULL,0,NULL,NULL) - 1;
LONG lLeftX = rect.left + (rect.Width() - nLenthBuf * 6) / 2;
LONG lLeftY = rect.top + (rect.Height() - 14) / 2;
m_dcBack.SetBkColor(m_clNorBack);
m_dcBack.SetTextColor(m_clNorText);
m_dcBack.ExtTextOut(lLeftX,lLeftY,ETO_OPAQUE,NULL,m_strTitleInfo,NULL);
Invalidate(FALSE);
m_bLastState = false;
}
{
CWnd::OnSetFocus(pOldWnd);
// TODO: Add your message handler code here
if (!m_bLastState)
{
DrawBackForFoc();
}
}
void CMyButton::OnKillFocus(CWnd* pNewWnd)
{
CWnd::OnKillFocus(pNewWnd);
// TODO: Add your message handler code here
if (m_bLastState)
{
DrawBackForNor();
}
}
{
// TODO: Add your message handler code here and/or call default
if (m_lpDealWithBTN != NULL)
{
m_lpDealWithBTN();
}
SetFocus();
CWnd::OnLButtonDown(nFlags, point);
}
void CMyButton::SetWindowText(LPCTSTR lpszString)
{
m_strTitleInfo = lpszString;
if (m_bLastState)
{
DrawBackForFoc();
}
else
{
DrawBackForNor();
}
}
BOOL CMyButton::EnableWindow(BOOL bEnable /* = TRUE */)
{
if (bEnable)
{
DrawBackForNor();
}
else
{
DrawBackForMid();
}
return CWnd::EnableWindow(bEnable);
}
注意:所有代碼中ExtTextOut 完全可以用DrawText來代替,更簡單一些。
爲了實現主窗體跟按鈕之間的通信,例如當按鈕按下時,按鈕要通知主窗體,我在這裏添加函數指針來實現,當然也可以通過消息的方式來實現。聲明函數指針:typedef void (*LPDealWithBTN)();
LPDealWithBTN m_lpDealWithBTN;//函數指針
把所有代碼添加完畢就可以實現效果了。在主程序就可以添加相關的函數,如果要使用函數指針來實現通知的話,需先建立一個static函數。例如static void OnDealWithBTN01();
test:
CMyButton m_myBTN01;
m_myBTN01.CreateBTN(L"TestBTN",WS_CHILD|WS_VISIBLE,CRect(260,110,335,130),this,0,OnDealWithBTN01);
void CTestBtnDlg::OnDealWithBTN01()
{
printf("BTN01 pressed/r/n");
}
當然也可以實現貼圖,這是完全可以的。如果要貼圖的話,又要實現透明效果圖片的話,那麼參考一下代碼:
void CMyButton::DrawTransParent(CBitmap &bmp,int const x,int const y,int const cx,int const cy,
int const srcx,int const srcy,CDC *pDC,COLORREF TransparentColor)
{
//定義源、掩碼、透明繪製環境
CDC SrcDC,MaskDC,TransDC;
//定義掩碼、透明位圖
CBitmap MaskBmp,TransBmp;
BITMAP bm;
//創建源、掩碼、透明繪製環境
SrcDC.CreateCompatibleDC(pDC);
MaskDC.CreateCompatibleDC(pDC);
TransDC.CreateCompatibleDC(pDC);
//得到位圖結構
bmp.GetBitmap(&bm);
//創建透明位圖
TransBmp.CreateCompatibleBitmap(pDC,cx,cy);
//創建掩碼位圖
MaskBmp.CreateBitmap(cx,cy,1,1,NULL);
//將透明位圖對象選入到透明繪圖環境
CBitmap *pTransBmp = TransDC.SelectObject(&TransBmp);
//將目標位圖繪製到透明位圖中
TransDC.BitBlt(x,y,cx,cy,pDC,srcx,srcy,SRCCOPY);
//將實際位圖對象選入源繪圖環境
CBitmap *pSrcBmp = SrcDC.SelectObject(&bmp);
//設置背景爲透明模式
SrcDC.SetBkMode(TRANSPARENT);
//設置背景色
if (TransparentColor)
SrcDC.SetBkColor(TransparentColor);
else
{
COLORREF col = SrcDC.GetPixel(0,bm.bmHeight-1);
SrcDC.SetBkColor(col);
}
CBitmap *pMaskBmp = MaskDC.SelectObject(&MaskBmp);
//將源繪圖環境繪製到掩碼繪圖環境中
MaskDC.BitBlt(x,y,cx,cy,&SrcDC,0,0,SRCCOPY);
//將源位圖和透明位圖進行異或操作融合
TransDC.BitBlt(x,y,cx,cy,&SrcDC,0,0,SRCINVERT);
//將透明位圖和掩碼位圖進行與操作
TransDC.BitBlt(x,y,cx,cy,&MaskDC,0,0,SRCAND);
//再將源位圖和透明位圖進行異或操作
TransDC.BitBlt(x,y,cx,cy,&SrcDC,0,0,SRCINVERT);
//此時將透明位圖繪製到目標設備上
BOOL bRet = pDC->BitBlt(x,y,cx,cy,&TransDC,srcx,srcy,SRCCOPY);
//繪製繪圖對象,並釋放相應繪圖環境和位圖對象
SrcDC.SelectObject(pSrcBmp);
SrcDC.DeleteDC();
TransDC.SelectObject(pTransBmp);
TransBmp.DeleteObject();
TransDC.DeleteDC();
MaskDC.SelectObject(pMaskBmp);
MaskDC.DeleteDC();
MaskBmp.DeleteObject();
}
調用時:
CBitmap bmp;
bmp.LoadBitmap(IDB_BITMAP_MID);
BITMAP bm;
bmp.GetBitmap(&bm);
DrawTransParent(bmp,0,0,bm.bmWidth,bm.bmHeight,0,0,&m_dcBack,NULL);
bmp.DeleteObject();
注:原文出處http://blog.csdn.net/KevinCEC/archive/2008/01/22/2059564.aspx