位图按钮类，实现了按下、放开和鼠标在按钮上的图片更换。

位图按钮类，实现了按下、放开和鼠标在按钮上的图片更换。

一个位图按钮类，实现了按下、放开和鼠标在按钮上的图片更换。

/ 
// 工程: YF_GCM -> ButtonDemo 
// 作者: **
// 描述: 自绘制位图按钮
// 主要函数：
//         SetButtonUpBitmapEx()设置鼠标放置在按钮上的图片
//         SetButtonDownBitmapEx()设置按钮按下的图片
//         SetButtonNormalBitmapEx()设置鼠标不在按钮是的图片
// 日期: 2013.12.16
// 版本: 1.0
// 修改: 
/ 
// BitmapButtonEx.cpp : 实现文件
//
 
#include "stdafx.h"
#include "resource.h"
#include "BitmapButtonEx.h"
 
 
// CBitmapButtonEx
 
IMPLEMENT_DYNAMIC(CBitmapButtonEx, CBitmapButton)
 
CBitmapButtonEx::CBitmapButtonEx()
: m_hUpBitmap(NULL)
, m_hDownBitmap(NULL)
, m_hNormalBitmap(NULL)
, m_lButtonDown(FALSE)
, m_bMouseOver(FALSE)
, m_bTrack(FALSE)
{
    m_rgn.CreateRectRgn(0,0,0,0);
}
 
CBitmapButtonEx::~CBitmapButtonEx()
{
    if (NULL != m_hUpBitmap)
    {
        ::DeleteObject(m_hUpBitmap);
    }
    if (NULL != m_hDownBitmap)
    {
        ::DeleteObject(m_hDownBitmap);
    }
    if (NULL != m_hNormalBitmap)
    {
        ::DeleteObject(m_hDownBitmap);
    }
}
 
 
BEGIN_MESSAGE_MAP(CBitmapButtonEx, CBitmapButton)
    ON_WM_LBUTTONDOWN()
    ON_WM_LBUTTONUP()
    ON_WM_MOUSEMOVE()
END_MESSAGE_MAP()
 
 
 
// CBitmapButtonEx 消息处理程序
 
BOOL CBitmapButtonEx::SetButtonUpBitmapEx(const CString& szFilePath)
{
    if (NULL != m_hUpBitmap)
    {
        ::DeleteObject(m_hUpBitmap);
        m_hUpBitmap = NULL;
    }
 
    m_hUpBitmap = (HBITMAP)LoadImage(NULL, szFilePath, IMAGE_BITMAP, 0,0, LR_LOADFROMFILE); // 载入  
 
 
    return NULL != m_hUpBitmap;
}
 
 
BOOL CBitmapButtonEx::SetButtonUpBitmapEx(HBITMAP hBitmap)
{
    m_hUpBitmap = hBitmap;
 
    return NULL != m_hUpBitmap;
}
BOOL CBitmapButtonEx::SetButtonNormalBitmapEx(HBITMAP hBitmap)
{
    m_hNormalBitmap = hBitmap;
 
    return NULL != m_hNormalBitmap;
}
BOOL CBitmapButtonEx::SetButtonNormalBitmapEx(const CString& szFilePath)
{
    if (NULL != m_hNormalBitmap)
    {
        ::DeleteObject(m_hNormalBitmap);
        m_hNormalBitmap = NULL;
    }
    m_hNormalBitmap = (HBITMAP)LoadImage(NULL, szFilePath, IMAGE_BITMAP, 0,0, LR_LOADFROMFILE); // 载入  
 
    return NULL != m_hNormalBitmap;
}
 
BOOL CBitmapButtonEx::SetButtonDownBitmapEx(const CString& szFilePath)
{
    if (NULL != m_hDownBitmap)
    {
        ::DeleteObject(m_hDownBitmap);
        m_hDownBitmap = NULL;
    }
    m_hDownBitmap = (HBITMAP)LoadImage(NULL, szFilePath, IMAGE_BITMAP, 0,0, LR_LOADFROMFILE); // 载入  
 
    return NULL != m_hDownBitmap;
}
BOOL CBitmapButtonEx::SetButtonDownBitmapEx(HBITMAP hBitmap)
{
    m_hDownBitmap = hBitmap;
 
    return NULL != m_hDownBitmap;
}
void CBitmapButtonEx::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
{
    // TODO:  添加您的代码以绘制指定项
    CRect rect =  lpDrawItemStruct->rcItem;
    CDC *pDC = CDC::FromHandle(lpDrawItemStruct->hDC);
    //    
    CBitmap hbmp;
    if (m_lButtonDown)
    {
        hbmp.Attach(m_hDownBitmap);
    }
    else
    {
        if (m_bMouseOver)
        {
            hbmp.Attach(m_hUpBitmap);
        }
        else
        {
            hbmp.Attach(m_hNormalBitmap);
        }
    }
 
    BITMAP bm; 
    hbmp.GetBitmap(&bm);  
    CDC* thisdc = NULL;
    thisdc = GetDC();
 
    CDC dcMem; 
    dcMem.CreateCompatibleDC(thisdc); 
    CBitmap *poldBitmap=(CBitmap*)dcMem.SelectObject(hbmp); 
    //显示位图 
    thisdc->SelectClipRgn(&m_rgn);  //改变pDC的裁减区域
    dcMem.SelectClipRgn(&m_rgn);
    // 无缩放
//     GetDC()->BitBlt(0, 0, bm.bmWidth, bm.bmHeight, &dcMem, 0, 0, SRCCOPY);
    // 缩放
    thisdc->StretchBlt(rect.left ,rect.top , rect.Width(), rect.Height(), 
        &dcMem,0 ,0, bm.bmWidth, bm.bmHeight, SRCCOPY); 
 
    dcMem.SelectObject(&poldBitmap);
    this->ReleaseDC(thisdc);
    hbmp.Detach();
}
 
void CBitmapButtonEx::PreSubclassWindow()
{
    // TODO: 在此添加专用代码和/或调用基类
	
    ModifyStyle(0, BS_OWNERDRAW); //设置按钮的有效区域 
    CRgn rgn; 
    CRect rc;
    GetClientRect(&rc); //有效区域为一个角半径为5的圆角矩形 
    m_rgn.DeleteObject();
    m_rgn.CreateRoundRectRgn(rc.left,rc.top,rc.right,rc.bottom, 5, 5); 
    rgn.CreateRoundRectRgn(rc.left,rc.top,rc.right,rc.bottom, 5, 5); 
    rgn.CopyRgn(&m_rgn);
 
    SetWindowRgn(rgn, TRUE); 
    rgn.DeleteObject(); 
 
//     CRgn rgn; 
//     CRect rc;
//     GetClientRect(&rc); //有效区域为一个角半径为5的圆角矩形 
// 
//     rgn.CreateRoundRectRgn(rc.left,rc.top,rc.right,rc.bottom, 5, 5); 
//     SetWindowRgn(rgn,TRUE); 
//     rgn.DeleteObject(); 
// 
    CBitmapButton::PreSubclassWindow();
}
 
void CBitmapButtonEx::OnLButtonDown(UINT nFlags, CPoint point)
{
    // TODO: 在此添加消息处理程序代码和/或调用默认值
    m_lButtonDown = TRUE;
    InvalidateRect(NULL);
    CBitmapButton::OnLButtonDown(nFlags, point);
}
 
void CBitmapButtonEx::OnLButtonUp(UINT nFlags, CPoint point)
{
    // TODO: 在此添加消息处理程序代码和/或调用默认值
    m_lButtonDown = FALSE;
    InvalidateRect(NULL);
    CBitmapButton::OnLButtonUp(nFlags, point);
}
 
BOOL CBitmapButtonEx::SetButtonRgn(const CRgn& rgn)
{
    m_rgn.CopyRgn(&m_rgn);
    return 0;
}
 
BOOL CBitmapButtonEx::PreTranslateMessage(MSG* pMsg)
{
    // TODO: 在此添加专用代码和/或调用基类
 
 
 
    if(pMsg->message==WM_MOUSELEAVE) 
    {
        m_bTrack=FALSE;
        m_bMouseOver = FALSE;
        InvalidateRect(NULL);
    }
    else if (pMsg->message==WM_MOUSEHOVER)
    {
        m_bMouseOver = TRUE;
        InvalidateRect(NULL);
    }
 
    return CBitmapButton::PreTranslateMessage(pMsg);
}
 
void CBitmapButtonEx::OnMouseMove(UINT nFlags, CPoint point)
{
    // TODO: 在此添加消息处理程序代码和/或调用默认值
 
    if(!m_bTrack)
    {
        TRACKMOUSEEVENT tme;
        tme.cbSize=sizeof(TRACKMOUSEEVENT);
        tme.dwFlags=TME_HOVER | TME_LEAVE;
        tme.dwHoverTime=HOVER_DEFAULT;
        tme.hwndTrack=m_hWnd;
 
        m_bTrack=_TrackMouseEvent(&tme);
    }
 
    CBitmapButton::OnMouseMove(nFlags, point);
}

#pragma once
#include "afxwin.h"
// 工程: YF_GCM -> ButtonDemo 
// 作者: **
// 描述: 自绘制位图按钮
// 主要函数：
//         SetButtonUpBitmapEx()设置鼠标放置在按钮上的图片
//         SetButtonDownBitmapEx()设置按钮按下的图片
//         SetButtonNormalBitmapEx()设置鼠标不在按钮是的图片
// 日期: 2013.12.16
// 版本: 1.0
// 修改: 
/ 
// CBitmapButtonEx
 
class CBitmapButtonEx : public CBitmapButton
{
	DECLARE_DYNAMIC(CBitmapButtonEx)
 
public:
	CBitmapButtonEx();
	virtual ~CBitmapButtonEx();
 
protected:
	DECLARE_MESSAGE_MAP()
 
protected:
//     // all bitmaps must be the same size
//     CBitmap m_bitmap;           // normal image (REQUIRED)
//     CBitmap m_bitmapSel;        // selected image (OPTIONAL)
//     CBitmap m_bitmapFocus;      // focused but not selected (OPTIONAL)
//     CBitmap m_bitmapDisabled;   // disabled bitmap (OPTIONAL)
// 
//     virtual void DrawItem(LPDRAWITEMSTRUCT lpDIS);
 
    virtual void DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct);
 
 
 
public:
    // 设置按钮抬起图片
    BOOL SetButtonUpBitmapEx(const CString& szFilePath);
    BOOL SetButtonUpBitmapEx(HBITMAP hBitmap);
    // 设置按钮按下图片
    BOOL SetButtonDownBitmapEx(const CString& szFilePath);
    BOOL SetButtonDownBitmapEx(HBITMAP hBitmap);
    // 普通按钮图片
    BOOL SetButtonNormalBitmapEx(const CString& szFilePath);
    BOOL SetButtonNormalBitmapEx(HBITMAP hBitmap);
 
protected:
    virtual void PreSubclassWindow();
public:
    afx_msg void OnLButtonDown(UINT nFlags, CPoint point);
    afx_msg void OnLButtonUp(UINT nFlags, CPoint point);
protected:
    BOOL m_lButtonDown;
    // 按钮有效区域
    CRgn m_rgn;
private:
    // 图片
    HBITMAP m_hUpBitmap;
    HBITMAP m_hDownBitmap;
    HBITMAP m_hNormalBitmap;
 
public:
    BOOL SetButtonRgn(const CRgn & rgn);
    virtual BOOL PreTranslateMessage(MSG* pMsg);
    afx_msg void OnMouseMove(UINT nFlags, CPoint point);
protected:
    BOOL m_bMouseOver;
    BOOL m_bTrack;
};

效果图显示如图中in的按钮