扩展的XPButton类，如何在按键左边加上图片？

Question

扩展的XPButton类 继承于 CButtonXPButton.hclass CXPButton : public CButton
{
// Construction
public:
CXPButton(); // Attributes
protected:
//按钮的外边框
CPen m_BoundryPen;

//鼠标指针置于按钮之上时按钮的内边框
CPen m_InsideBoundryPenLeft;
CPen m_InsideBoundryPenRight;
CPen m_InsideBoundryPenTop;
CPen m_InsideBoundryPenBottom;

//按钮获得焦点时按钮的内边框
CPen m_InsideBoundryPenLeftSel;
CPen m_InsideBoundryPenRightSel;
CPen m_InsideBoundryPenTopSel;
CPen m_InsideBoundryPenBottomSel;

//按钮的底色，包括有效和无效两种状态
CBrush m_FillActive;
CBrush m_FillInactive;

//按钮的状态
BOOL m_bOver; //鼠标位于按钮之上时该值为true，反之为flase
BOOL m_bTracking; //在鼠标按下没有释放时该值为true
BOOL m_bSelected; //按钮被按下是该值为true
BOOL m_bFocus; //按钮为当前焦点所在时该值为true// Operations
public:// Overrides
// ClassWizard generated virtual function overrides
//{{AFX_VIRTUAL(CXPButton)
protected:
        virtual void PreSubclassWindow();
//}}AFX_VIRTUAL// Implementation
public:
virtual void DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct);
virtual void DoGradientFill(CDC *pDC, CRect* rect);
virtual void DrawInsideBorder(CDC *pDC, CRect* rect);
virtual ~CXPButton(); // Generated message map functions
protected:
//{{AFX_MSG(CXPButton)
afx_msg void OnMouseMove(UINT nFlags, CPoint point);
afx_msg LRESULT OnMouseLeave(WPARAM wParam, LPARAM lParam);
afx_msg LRESULT OnMouseHover(WPARAM wParam, LPARAM lParam);

//}}AFX_MSG DECLARE_MESSAGE_MAP()
};////////////////////////////////////////////////////////////////
XPButton.cpp
#include "stdafx.h"
#include "XPButton.h"#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif/////////////////////////////////////////////////////////////////////////////
// CXPButtonCXPButton::CXPButton()
{
m_BoundryPen.CreatePen(PS_INSIDEFRAME | PS_SOLID, 1, RGB(0, 0, 0));
m_InsideBoundryPenLeft.CreatePen(PS_INSIDEFRAME | PS_SOLID, 3, RGB(250, 196, 88)); 
m_InsideBoundryPenRight.CreatePen(PS_INSIDEFRAME | PS_SOLID, 3, RGB(251, 202, 106));
m_InsideBoundryPenTop.CreatePen(PS_INSIDEFRAME | PS_SOLID, 2, RGB(252, 210, 121));
m_InsideBoundryPenBottom.CreatePen(PS_INSIDEFRAME | PS_SOLID, 2, RGB(229, 151, 0));

m_FillActive.CreateSolidBrush(RGB(223, 222, 236));
m_FillInactive.CreateSolidBrush(RGB(222, 223, 236));

m_InsideBoundryPenLeftSel.CreatePen(PS_INSIDEFRAME | PS_SOLID, 3, RGB(153, 198, 252)); 
m_InsideBoundryPenTopSel.CreatePen(PS_INSIDEFRAME | PS_SOLID, 2, RGB(162, 201, 255));
m_InsideBoundryPenRightSel.CreatePen(PS_INSIDEFRAME | PS_SOLID, 3, RGB(162, 189, 252));
m_InsideBoundryPenBottomSel.CreatePen(PS_INSIDEFRAME | PS_SOLID, 2, RGB(162, 201, 255));

m_bOver = m_bSelected = m_bTracking = m_bFocus = FALSE;

}CXPButton::~CXPButton()
{
m_BoundryPen.DeleteObject();
m_InsideBoundryPenLeft.DeleteObject();
m_InsideBoundryPenRight.DeleteObject();
m_InsideBoundryPenTop.DeleteObject();
m_InsideBoundryPenBottom.DeleteObject();

m_FillActive.DeleteObject();
m_FillInactive.DeleteObject();

m_InsideBoundryPenLeftSel.DeleteObject();
m_InsideBoundryPenTopSel.DeleteObject();
m_InsideBoundryPenRightSel.DeleteObject();
m_InsideBoundryPenBottomSel.DeleteObject();

}
BEGIN_MESSAGE_MAP(CXPButton, CButton)
//{{AFX_MSG_MAP(CXPButton)
ON_WM_MOUSEMOVE()
ON_MESSAGE(WM_MOUSELEAVE, OnMouseLeave)
ON_MESSAGE(WM_MOUSEHOVER, OnMouseHover)
//}}AFX_MSG_MAP
END_MESSAGE_MAP()/////////////////////////////////////////////////////////////////////////////
// CXPButton message handlers//添加Owner Draw属性
void CXPButton::PreSubclassWindow() 
{
// TODO: Add your specialized code here and/or call the base class

CButton::PreSubclassWindow();
ModifyStyle(0, BS_OWNERDRAW);
}void CXPButton::OnMouseMove(UINT nFlags, CPoint point) 
{
// TODO: Add your message handler code here and/or call default
if (!m_bTracking)
{
TRACKMOUSEEVENT tme;
tme.cbSize = sizeof(tme);
tme.hwndTrack = m_hWnd;
tme.dwFlags = TME_LEAVE | TME_HOVER;
tme.dwHoverTime = 1;
m_bTracking = _TrackMouseEvent(&tme);
}

CButton::OnMouseMove(nFlags, point);
}
LRESULT CXPButton::OnMouseLeave(WPARAM wParam, LPARAM lParam)
{
m_bOver = FALSE;
m_bTracking = FALSE;
InvalidateRect(NULL, FALSE);
return 0;
}LRESULT CXPButton::OnMouseHover(WPARAM wParam, LPARAM lParam)
{
m_bOver = TRUE;
InvalidateRect(NULL);
return 0;
}
void CXPButton::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
{
//从lpDrawItemStruct获取控件的相关信息
CRect rect =  lpDrawItemStruct->rcItem;
CDC *pDC=CDC::FromHandle(lpDrawItemStruct->hDC);
int nSaveDC=pDC->SaveDC();
UINT state = lpDrawItemStruct->itemState;
POINT pt ;
TCHAR strText[MAX_PATH + 1];
::GetWindowText(m_hWnd, strText, MAX_PATH);

//画按钮的外边框，它是一个半径为5的圆角矩形
pt.x = 5;
pt.y = 5;
CPen* hOldPen = pDC->SelectObject(&m_BoundryPen);
pDC->RoundRect(&rect, pt);

//获取按钮的状态
if (state & ODS_FOCUS)
{
m_bFocus = TRUE;
m_bSelected = TRUE;
}
else
{
m_bFocus = FALSE;
m_bSelected = FALSE;
}


if (state & ODS_SELECTED || state & ODS_DEFAULT)
{
m_bFocus = TRUE;
}
pDC->SelectObject(hOldPen);

rect.DeflateRect(CSize(GetSystemMetrics(SM_CXEDGE), GetSystemMetrics(SM_CYEDGE)));

//根据按钮的状态填充按钮的底色
CBrush* pOldBrush;
if (m_bOver)
{
pOldBrush = pDC->SelectObject(&m_FillActive);
DoGradientFill(pDC, &rect);
}
else
{
pOldBrush = pDC->SelectObject(&m_FillInactive);
DoGradientFill(pDC, &rect);
}

//根据按钮的状态绘制内边框
if (m_bOver || m_bSelected)
DrawInsideBorder(pDC, &rect);

pDC->SelectObject(pOldBrush);

//显示按钮的文本
if (strText!=NULL)
{
CFont* hFont = GetFont();
CFont* hOldFont = pDC->SelectObject(hFont);
CSize szExtent = pDC->GetTextExtent(strText, lstrlen(strText));
CPoint pt( rect.CenterPoint().x - szExtent.cx / 2, rect.CenterPoint().y - szExtent.cy / 2);
if (state & ODS_SELECTED) 
pt.Offset(1, 1);
int nMode = pDC->SetBkMode(TRANSPARENT);
if (state & ODS_DISABLED)
pDC->DrawState(pt, szExtent, strText, DSS_DISABLED, TRUE, 0, (HBRUSH)NULL);
else
pDC->DrawState(pt, szExtent, strText, DSS_NORMAL, TRUE, 0, (HBRUSH)NULL);
pDC->SelectObject(hOldFont);
pDC->SetBkMode(nMode);
}


pDC->RestoreDC(nSaveDC);
}//绘制按钮的底色
void CXPButton::DoGradientFill(CDC *pDC, CRect* rect)
{
CBrush brBk[64];
int nWidth = rect->Width();
int nHeight = rect->Height();
CRect rct;

for (int i = 0; i < 64; i ++)
{
if (m_bOver)
{
if (m_bFocus)
brBk[i].CreateSolidBrush(RGB(255 - (i / 4), 255 - (i / 4), 255 - (i / 3)));
else
brBk[i].CreateSolidBrush(RGB(255 - (i / 4), 255 - (i / 4), 255 - (i / 5)));
}
else
{
if (m_bFocus)
brBk[i].CreateSolidBrush(RGB(255 - (i / 3), 255 - (i / 3), 255 - (i / 4)));
else
brBk[i].CreateSolidBrush(RGB(255 - (i / 3), 255 - (i / 3), 255 - (i / 5)));
}
}

for (i = rect->top; i <= nHeight + 2; i ++) 
{
rct.SetRect(rect->left, i, nWidth + 2, i + 1);
pDC->FillRect(&rct, &brBk[((i * 63) / nHeight)]);
}

for (i = 0; i < 64; i ++)
brBk[i].DeleteObject();
}
//绘制按钮的内边框
void CXPButton::DrawInsideBorder(CDC *pDC, CRect* rect)
{
CPen *pLeft, *pRight, *pTop, *pBottom;

if (m_bSelected && !m_bOver)
{
pLeft = & m_InsideBoundryPenLeftSel;
pRight = &m_InsideBoundryPenRightSel;
pTop = &m_InsideBoundryPenTopSel;
pBottom = &m_InsideBoundryPenBottomSel;
}
else
{
pLeft = &m_InsideBoundryPenLeft;
pRight = &m_InsideBoundryPenRight;
pTop = &m_InsideBoundryPenTop;
pBottom = &m_InsideBoundryPenBottom;
}

CPoint oldPoint = pDC->MoveTo(rect->left, rect->bottom - 1);
CPen* pOldPen = pDC->SelectObject(pLeft);
pDC->LineTo(rect->left, rect->top + 1);
pDC->SelectObject(pRight);
pDC->MoveTo(rect->right - 1, rect->bottom - 1);
pDC->LineTo(rect->right - 1, rect->top);
pDC->SelectObject(pTop);
pDC->MoveTo(rect->left - 1, rect->top);
pDC->LineTo(rect->right - 1, rect->top);
pDC->SelectObject(pBottom);
pDC->MoveTo(rect->left, rect->bottom);
pDC->LineTo(rect->right - 1, rect->bottom);
pDC->SelectObject(pOldPen);
pDC->MoveTo(oldPoint); if (m_bSelected && !m_bOver)
DrawFocusRect(pDC->m_hDC,rect);
}

Answer 1

在DrawItem虚函数里贴图就好了

Answer 2

里面确实有响应了DrawItem消息，只是画框及输出问题的，，不知道这种情况如何贴图?

Answer 3

看看这个是不是对你有帮助
http://blog.csdn.net/xianglitian/article/details/1728242

Answer 4

void CXPButton::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
{....        CDC MemDC;                                       //把图片加载画刷子
        MemDC.CreateCompatibleDC(pDC);
        CBitmap *pOldBmp;
        pOldBmp = MemDC.SelectObject(&m_ShowBitmap);
        BITMAP bmp; 
m_ShowBitmap.GetObject(sizeof(bmp),&bmp);       
      
        pDC->BitBlt(10,10,rect.Width(),rect.Height(),&MemDC,0,0,SRCCOPY);        
ReleaseDC(&MemDC);
..
  已经可以贴图了，问题又来了，如何判断图片贴在区域左边中间呢？

Answer 5

不断的学习，
        BITMAP bm;
        m_ShowBitmap.GetBitmap(&bm);                     //获取BMP图片的大小
        int nWidth = bm.bmWidth;
int nHeight = bm.bmHeight;