wince(windows mobile) 中win32 实现带透明背景的贴图按钮

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在wince中也看到别人实现过贴图按钮，但多数是在MFC中继承CButton类实现的，很少有在Win32中直接实现的，在前人基础上写了个ImageButton类可以完成该功能，纯Win32实现的。

主要是实现描述如下:

首先是创建按钮，位置上可以是RECT型参数也可也是，(x,y,iWidth,iHeight)形式的参数。因为是贴图按钮，所以需要加上BS_OWNERDRAW属性。

CreateWindow(_T("Button"), _T(""), WS_VISIBLE | WS_CHILD | BS_OWNERDRAW,rt.left, rt.top, rt.right-rt.left, rt.bottom-rt.top, m_hParentWnd, (HMENU)iResID, m_hInstance, NULL);

然后是加载图片，可以通过绝对路径加载（windows mobile中没有相对路径的概念），也可以通过图片的资源ID加载。

SHLoadImageResource(m_hInstance, iResID);

然后是通过父窗口响应WM_DRAWITEM 根据按钮状态画出按钮图片。分为透明和不透明2种情况

if(bTransparent){SetBkMode(lpDis->hDC, TRANSPARENT);COLORREF rgb = GetTransparentRGB(hMemDC);//先将背景画上BitBlt(lpDis->hDC, 0, 0, m_iWidth, m_iHeight, m_hBgDC, m_rt.left, m_rt.top, SRCCOPY);if((lpDis->itemState & ODS_SELECTED)){TransparentBlt(lpDis->hDC, lpDis->rcItem.left, lpDis->rcItem.top, m_iWidth, m_iHeight, hMemDC, m_iWidth, 0, m_iWidth, m_iHeight, rgb);}else{TransparentBlt(lpDis->hDC, lpDis->rcItem.left, lpDis->rcItem.top, m_iWidth, m_iHeight, hMemDC, 0, 0, m_iWidth, m_iHeight, rgb);}}else{if((lpDis->itemState & ODS_SELECTED)){StretchBlt(lpDis->hDC, lpDis->rcItem.left, lpDis->rcItem.top, m_iWidth, m_iHeight, hMemDC, m_iWidth, 0, m_iWidth, m_iHeight, SRCCOPY);}else{StretchBlt(lpDis->hDC, lpDis->rcItem.left, lpDis->rcItem.top, m_iWidth, m_iHeight, hMemDC, 0, 0, m_iWidth, m_iHeight, SRCCOPY);}}

下面再说下ImageButton类的使用方法：

创建并加载图片

ImageButton g_btnTest;g_btnTest.Create(g_hInst, hWnd, g_hBKMemDC, 1, 0, 0, 80, 80);g_btnTest.LoadImage(IDR_GIF_TEST);

其中g_hInst是程序实例，hWnd是主窗口句柄，g_hBKMemDC可以是程序背景图加载的内存DC，类似如下：

TCHAR lpFilePath[MAX_PATH] = {0};memset(lpFilePath, 0, sizeof(lpFilePath));GetModuleFileName(NULL, lpFilePath, MAX_PATH);*_tcsrchr(lpFilePath,'//') = '/0';_tcscat(lpFilePath, _T("//Image//bg.jpg"));HBITMAP hBMP = SHLoadImageFile(lpFilePath);g_hBKMemDC = CreateCompatibleDC(NULL);HBITMAP hOldBMP = (HBITMAP)SelectObject(g_hBKMemDC, hBMP);

在主窗口的WndProc中响应WM_DRAWITEM消息，根据wParam参数找到对应ID，然后调用

g_btnTest.Draw((LPDRAWITEMSTRUCT)lParam);

还需要在主窗口的WndProc中响应WM_CTLCOLORBTN消息，加上下面代码（改变按钮默认的背景画刷）

return (LRESULT)GetStockObject(NULL_BRUSH);

完整的代码如下：

///////////////////////////////////////2010/07/30 by dream///////////////////////////////////////文件名称:ImageButton.h//内容:类ImageButton 声明/////////////////////////////////////#pragma onceclass ImageButton{public:ImageButton();virtual ~ImageButton();HWND Create(HINSTANCE hInstance, HWND hParentWnd, HDC hBgDC, int iResID, RECT rt);HWND Create(HINSTANCE hInstance, HWND hParentWnd, HDC hBgDC, int iResID, int x, int y, int iWidth, int iHeight);bool LoadImage(const TCHAR *lpFilePath);bool LoadImage(int iResID);void Draw(LPDRAWITEMSTRUCT lpDis, bool bTransparent = true);COLORREF GetTransparentRGB(HDC hdc);protected:HWND m_hParentWnd;//父窗口句柄HINSTANCE m_hInstance;//程序实例句柄HDC m_hBgDC;//背景DCRECT m_rt;//位置HWND m_hWnd;//句柄HBITMAP m_hBMP;//图片句柄int m_iWidth;//宽度int m_iHeight;//高度}; ///////////////////////////////////////2010/07/30 by dream///////////////////////////////////////文件名称:ImageButton.cpp//内容:类ImageButton 实现/////////////////////////////////////#include "stdafx.h"#include "ImageButton.h"ImageButton::ImageButton():m_hInstance(NULL), m_hParentWnd(NULL){}ImageButton::~ImageButton(){ DeleteObject(m_hBMP);}//功能:创建按钮//参数://hInstance: 程序实例句柄//hParentWnd:父窗口指针//hBgDC:背景dc//iResID:按钮ID//rt:位置HWND ImageButton::Create(HINSTANCE hInstance, HWND hParentWnd, HDC hBgDC, int iResID, RECT rt){ASSERT(hInstance);ASSERT(hParentWnd);//因为wince中不支持GWL_HINSTANCE,所以只能传进来了//m_hInstance = GetWindowLong(m_hParentWnd, GWL_HINSTANCE);m_hInstance = hInstance;m_hBgDC = hBgDC;m_hParentWnd = hParentWnd;m_rt = rt;m_iWidth = rt.right-rt.left;m_iHeight = rt.bottom-rt.top; m_hWnd = CreateWindow(_T("Button"), _T(""), WS_VISIBLE | WS_CHILD | BS_OWNERDRAW,rt.left, rt.top, rt.right-rt.left, rt.bottom-rt.top, m_hParentWnd, (HMENU)iResID, m_hInstance, NULL);return m_hWnd;}//功能:创建按钮//参数://hInstance: 程序实例句柄//hParentWnd:父窗口指针//hBgDC:背景dc//iResID:按钮ID//x:x位置//y:y位置//iWidth:宽度//iHeight:高度HWND ImageButton::Create(HINSTANCE hInstance, HWND hParentWnd, HDC hBgDC, int iResID, int x, int y, int iWidth, int iHeight){RECT rt = {x, y, x+iWidth, y+iHeight};return Create(hInstance, hParentWnd, hBgDC, iResID, rt);}//功能:加载按钮图片//参数://lpFilePath:按钮路径(绝对路径)bool ImageButton::LoadImage(const TCHAR *lpFilePath){m_hBMP = SHLoadImageFile(lpFilePath);return ((m_hBMP != NULL) ? true : false);}//功能:加载按钮图片//参数://iResID:图片对应的资源IDbool ImageButton::LoadImage(int iResID){m_hBMP = SHLoadImageResource(m_hInstance, iResID);return ((m_hBMP != NULL) ? true : false);}//功能:父窗口中响应 WM_DRAWITEM 画出按钮图片//参数://lpDis: 对应WM_DRAWITEM消息的lParam参数//bTransparent: 是否要透明显示void ImageButton::Draw(LPDRAWITEMSTRUCT lpDis, bool bTransparent){ASSERT(m_hBMP);ASSERT(lpDis); HDC hMemDC = CreateCompatibleDC(lpDis->hDC); HBITMAP hOldBMP = (HBITMAP)SelectObject(hMemDC, m_hBMP);if(bTransparent){SetBkMode(lpDis->hDC, TRANSPARENT);COLORREF rgb = GetTransparentRGB(hMemDC);//先将背景画上BitBlt(lpDis->hDC, 0, 0, m_iWidth, m_iHeight, m_hBgDC, m_rt.left, m_rt.top, SRCCOPY);if((lpDis->itemState & ODS_SELECTED)){TransparentBlt(lpDis->hDC, lpDis->rcItem.left, lpDis->rcItem.top, m_iWidth, m_iHeight, hMemDC, m_iWidth, 0, m_iWidth, m_iHeight, rgb);}else{TransparentBlt(lpDis->hDC, lpDis->rcItem.left, lpDis->rcItem.top, m_iWidth, m_iHeight, hMemDC, 0, 0, m_iWidth, m_iHeight, rgb);}}else{if((lpDis->itemState & ODS_SELECTED)){StretchBlt(lpDis->hDC, lpDis->rcItem.left, lpDis->rcItem.top, m_iWidth, m_iHeight, hMemDC, m_iWidth, 0, m_iWidth, m_iHeight, SRCCOPY);}else{StretchBlt(lpDis->hDC, lpDis->rcItem.left, lpDis->rcItem.top, m_iWidth, m_iHeight, hMemDC, 0, 0, m_iWidth, m_iHeight, SRCCOPY);}} SelectObject(hMemDC, hOldBMP); DeleteDC(hMemDC);}//功能:得到图片透明值//参数://hdc: 按钮图片对应的内存dcCOLORREF ImageButton::GetTransparentRGB(HDC hdc){return GetPixel(hdc, 0, 0);}

说明下，按钮图片样式如下：

前面是正常显示状态，后面是按下后的状态。