用MFC自绘按钮，处理的消息包括WM_MOUSEHOVER、WM_MOUSELEAVE、WM_LBUTTONDOWN

//PicButton.h

class CPicButton : public CButton

{

// Construction

public:

CPicButton();

BOOL bTrackLeave;

BOOL bBottonDown;

DWORD dwMouseStatus[2];

typedef enum tagStatus

{

emNormal,

emHover

}tStatus;

tStatus tIndex;

// Attributes

public:

// Operations

public:

void TraceMouseEvent();

// Overrides

// ClassWizard generated virtual function overrides

//{{AFX_VIRTUAL(CPicButton)

public:

virtual void DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct);

protected:

virtual void PreSubclassWindow();

virtual LRESULT DefWindowProc(UINT message, WPARAM wParam, LPARAM lParam);

//}}AFX_VIRTUAL

// Implementation

public:

virtual ~CPicButton();

// Generated message map functions

protected:

//{{AFX_MSG(CPicButton)

afx_msg void OnMouseMove(UINT nFlags, CPoint point);

//}}AFX_MSG

DECLARE_MESSAGE_MAP()

};

//PicButton.cpp

CPicButton::CPicButton()

{

tIndex = emNormal;

bTrackLeave = TRUE;

bBottonDown = FALSE;

}

CPicButton::~CPicButton()

{

}

BEGIN_MESSAGE_MAP(CPicButton, CButton)

//{{AFX_MSG_MAP(CPicButton)

ON_WM_MOUSEMOVE()

//}}AFX_MSG_MAP

END_MESSAGE_MAP()

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

// CPicButton message handlers

void CPicButton::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)

{

CDC cMemCD,cBmpCD;

CRect rc;

HGDIOBJ holdbitmap,hold;

GetClientRect(rc);

HBITMAP hBitMap = (HBITMAP)dwMouseStatus[tIndex];

BITMAP bm;

::GetObject(hBitMap,sizeof(BITMAP),&bm);

cMemCD.CreateCompatibleDC(CDC::FromHandle(lpDrawItemStruct->hDC));

CBitmap bitmap,*oldbitmap;

bitmap.CreateCompatibleBitmap(CDC::FromHandle(lpDrawItemStruct->hDC),rc.Width(),rc.Height());//兼容视图由设备DC创建，而非兼容DC

holdbitmap = cMemCD.SelectObject(bitmap);

cBmpCD.CreateCompatibleDC(CDC::FromHandle(lpDrawItemStruct->hDC));

hold = ::SelectObject(cBmpCD.GetSafeHdc(),hBitMap);

::StretchBlt(cMemCD.GetSafeHdc(),0,0,rc.Width(),rc.Height(),cBmpCD.GetSafeHdc(),0,0,bm.bmWidth,bm.bmHeight,SRCCOPY);

::SelectObject(cBmpCD.GetSafeHdc(),hold);

CBrush brush;

brush.CreateSolidBrush(RGB(0,0,255));

cMemCD.FrameRect(rc,&brush);

(CDC::FromHandle(lpDrawItemStruct->hDC))->BitBlt(0,0,rc.Width(),rc.Height(),&cMemCD,0,0,SRCCOPY);

cMemCD.SelectObject(holdbitmap);

bitmap.DeleteObject();

CString str;

GetWindowText(str);

COLORREF crold;

crold = ::SetTextColor(lpDrawItemStruct->hDC, RGB(17, 35, 113));

::SetBkMode(lpDrawItemStruct->hDC, TRANSPARENT);

if (TRUE == bBottonDown)

{

CRect rc1;

rc1 = lpDrawItemStruct->rcItem;

rc1.OffsetRect(2,1);

::DrawText(lpDrawItemStruct->hDC,str,str.GetLength(),rc1,DT_VCENTER|DT_SINGLELINE|DT_CENTER);

bBottonDown = FALSE;

}

else

{

::DrawText(lpDrawItemStruct->hDC,str,str.GetLength(),rc,DT_VCENTER|DT_SINGLELINE|DT_CENTER);

}

::SetTextColor(lpDrawItemStruct->hDC,crold);

}

void CPicButton::PreSubclassWindow()

{

BITMAP bm;

CRect rc;

GetClientRect(rc);

dwMouseStatus[emNormal] = (DWORD)LoadBitmap(AfxGetInstanceHandle(),MAKEINTRESOURCE(IDB_BITMAP2));

dwMouseStatus[emHover] = (DWORD)LoadBitmap(AfxGetInstanceHandle(),MAKEINTRESOURCE(IDB_BITMAP1));

::GetObject((HBITMAP)dwMouseStatus[emNormal],sizeof(BITMAP),&bm);

SetWindowPos(NULL,0,0,rc.Width(),bm.bmHeight,SWP_NOMOVE|SWP_NOZORDER);

CButton::PreSubclassWindow();

}

LRESULT CPicButton::DefWindowProc(UINT message, WPARAM wParam, LPARAM lParam)

{

switch(message)

{

case WM_MOUSEHOVER:

{

tIndex = emHover;

Invalidate();

}

break;

case WM_MOUSELEAVE:

{

bTrackLeave = TRUE;

tIndex = emNormal;

Invalidate();

}

break;

case WM_LBUTTONDOWN:

{

if (FALSE == bBottonDown)

{

bBottonDown = TRUE;

}

}

break;

default:

break;

}

return CButton::DefWindowProc(message, wParam, lParam);

}

void CPicButton::TraceMouseEvent()

{

TRACKMOUSEEVENT tEventTrack = {0};

tEventTrack.cbSize = sizeof(tEventTrack);

tEventTrack.dwFlags = TME_HOVER|TME_LEAVE;

tEventTrack.dwHoverTime = 1;

tEventTrack.hwndTrack = GetSafeHwnd();

BOOL bRet = _TrackMouseEvent(&tEventTrack);

}

void CPicButton::OnMouseMove(UINT nFlags, CPoint point)

{

if (bTrackLeave)

{

TraceMouseEvent();

bTrackLeave = FALSE;

}

CButton::OnMouseMove(nFlags, point);

}