CXPButton类（VC按钮自绘）

XPButton.h
===================================================
#if !defined(AFX_XPBUTTON_H__44CD5B2A_756E_4939_9261_E0034E0F2DEF__INCLUDED_)
#define AFX_XPBUTTON_H__44CD5B2A_756E_4939_9261_E0034E0F2DEF__INCLUDED_

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

/////////////////////////////////////////////////////////////////////////////
// CXPButton window

class 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()
};

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

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

#endif // !defined(AFX_XPBUTTON_H__44CD5B2A_756E_4939_9261_E0034E0F2DEF__INCLUDED_)

===============================================================
XPButton.cpp
===============================================================
// XPButton.cpp : implementation file
//

＃i nclude "stdafx.h"
＃i nclude "XPButton.h"

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

/////////////////////////////////////////////////////////////////////////////
// CXPButton

CXPButton::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)));
 //rect.DeflateRect(1, 1);
 
 //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 (int i = rect->top; i <= nHeight + 2; i ++)
 {
  rct.SetRect(rect->left, i, nWidth + 2, i + 1);
  pDC-&gt;FillRect(&rct, &brBk[((i * 63) / nHeight)]);
 }
 
 for (int 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-&gt;left, rect-&gt;bottom - 1);
 CPen* pOldPen = pDC-&gt;SelectObject(pLeft);
 pDC-&gt;LineTo(rect-&gt;left, rect-&gt;top + 1);
 pDC-&gt;SelectObject(pRight);
 pDC-&gt;MoveTo(rect-&gt;right - 1, rect-&gt;bottom - 1);
 pDC-&gt;LineTo(rect-&gt;right - 1, rect-&gt;top);
 pDC-&gt;SelectObject(pTop);
 pDC-&gt;MoveTo(rect-&gt;left - 1, rect-&gt;top);
 pDC-&gt;LineTo(rect-&gt;right - 1, rect-&gt;top);
 pDC-&gt;SelectObject(pBottom);
 pDC-&gt;MoveTo(rect-&gt;left, rect-&gt;bottom);
 pDC-&gt;LineTo(rect-&gt;right - 1, rect-&gt;bottom);
 pDC-&gt;SelectObject(pOldPen);
 pDC-&gt;MoveTo(oldPoint);

 if (m_bSelected && !m_bOver)
  DrawFocusRect(pDC-&gt;m_hDC,rect);
}