/************************************************************
* 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