VC下利用Picture控件实现png图片按钮（鼠标初始、按下、松开、获得焦点四种状态）

一时失言乱红尘 2023-10-18 08:04 59阅读 0赞

工程源码：[http://download.csdn.net/detail/zzzili/4186684][http_download.csdn.net_detail_zzzili_4186684]

![2012033014493759.jpg][]

![2012033014495394.jpg][]

/************************************************************
    * 类名:CPngStatic
    * 作用：在vc dialog中使用picture控件显示png图片，并相应鼠标
    *       消息，可做picture button使用
    * 注意：如果有背景时，背景控件必须在pngButton控件之下（tab=1）
    * 原理：使用控件背景覆盖法实现png图片的重画和透明效果
    *************************************************************/
    
    #ifndef _PNGBUTTON_ZZZILI
    #define _PNGBUTTON_ZZZILI
    
    #include "stdafx.h"
    
    class CMyImage:public Image
    {
    public:
     CMyImage(UINT uID)
     {
      // 初始化 Image 成员变量
      nativeImage = NULL;
      lastResult = InvalidParameter;
    
      // 查找图片资源
      HINSTANCE hInst =  GetModuleHandle(NULL);
      HRSRC hRsrc = FindResource(hInst, MAKEINTRESOURCE(uID), _T("PNG"));
      if (!hRsrc) {
       return;
      }
    
      // 加载资源并获取其指针
      HGLOBAL hMemRsrc = LoadResource(hInst, hRsrc);
      BYTE * pMemRsrc = (BYTE *)LockResource(hMemRsrc);
    
      // 为流分配全局内存空间
      size_t sizeRsrc = SizeofResource(hInst, hRsrc);
      HGLOBAL hMemStrm = GlobalAlloc(GMEM_FIXED, sizeRsrc);
      if (!hMemStrm) {
       return;
      }
    
      // 拷贝图片资源到全局内存空间中
      BYTE * pMemStrm = (BYTE *)GlobalLock(hMemStrm);
      memcpy(pMemStrm, pMemRsrc, sizeRsrc);
    
      // 使用图片资源流构造 Image 对象
      IStream * pStrm = NULL;
      CreateStreamOnHGlobal(hMemStrm, TRUE, &pStrm);
      lastResult = DllExports::GdipLoadImageFromStream(pStrm, &nativeImage);
      pStrm->Release();
    
     } 
    
    }; 
    
    class CPngStatic : public CStatic
    {
    public:
     CPngStatic();
     ~CPngStatic();
     void SetInitPngPic(int id);//设置初始png图片
     void SetClickDownPngPic(int id);//设置鼠标左键按下时png图片
     void SetClickUpPngPic(int id);//设置鼠标左键松开时png图片
     void SetMouseOnPngPic(int id);//设置鼠标在控件上时png图片
    private:
     RECT rp,lp;
     CDC *parentCDC;
     CDC* pFgndMemDC;
     BOOL isGetBj;
     CString pngFile;
     RECT m_rect;
     RECT m_bjRect;
     Image *m_image;
    private:
     CDC* GetParentBkgnd(CWnd *pWnd, CPoint ptDrawStart, int nWidth,int nHeight);
     CDC* CreateMixDC(CDC* pParentMemDC, Image* image);
     void AlphaGradientDraw(CWnd* pWnd, CDC* pFgndMemDC, CDC* pBkgndMemDC,CPoint ptDrawStart, int nWidth, int nHeight, int nTransparence);
    private:
     Image *ClickDownImage;
     Image *ClickUpImage;
     Image *MouseOnImage;
     Image *InitImage;
     BOOL isMouseOnPic;
     BOOL isSetClickDownImage;
     BOOL isSetClickUpImage;
     BOOL isSetMouseOnImage;
     BOOL isSetInitImage;
    private:
     void SetBj();
     void SetBitmap(Image *image);
    public:
     DECLARE_MESSAGE_MAP()
     afx_msg void OnPaint();
     afx_msg BOOL OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message);
     afx_msg void OnLButtonDown(UINT nFlags, CPoint point);
     afx_msg void OnLButtonUp(UINT nFlags, CPoint point);
     afx_msg void OnMouseLeave();
     afx_msg void OnMouseMove(UINT nFlags, CPoint point);
    };
    
    #endif

[http_download.csdn.net_detail_zzzili_4186684]: http://download.csdn.net/detail/zzzili/4186684
[2012033014493759.jpg]: http://pic002.cnblogs.com/images/2012/333067/2012033014493759.jpg
[2012033014495394.jpg]: http://pic002.cnblogs.com/images/2012/333067/2012033014495394.jpg