picbutton.cpp

一些关于C++开发的多媒体制作书籍的源代码

/*
* Copyright (c) 2002, Bcdliang
* All rights reserved.
*
* 文件名称：PicButton.cpp
* 摘    要：类CPicButton的实现

*
* 当前版本：1.01
* 作    者：LIANG Zheng
* 完成日期：2002年7月19日
*/

#include "stdafx.h"
#include "PicButton.h"

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

/////////////////////////////////////////////////////////////////////////////
// CPicButton

CPicButton::CPicButton()
{
}

CPicButton::~CPicButton()
{
}


////////////////////////////////////////////////////////////////////////
/*
* 函数名称：SetPic
* 函数介绍：指定背景图和前景图的资源ID, 设定按扭的图案
* 输入参数：UINT uIDBack, 背景图的资源ID
            UINT uIDFore, 前景图的资源ID
* 输出参数：无
* 返回值  ：无
*/
void CPicButton::SetPic(UINT uIDBack, UINT uIDFore)
{
	CDC *pDC, dcBack, dcFore;
	HBITMAP hbmpBack, hbmpFore;
	CBitmap bmpBack, bmpFore, *bmpOldBack, *bmpOldFore;
	BITMAP bmpinfo;
	CRect rect;

	this->GetClientRect(&rect);

	// Create DC.
	pDC = this->GetDC();
	dcBack.CreateCompatibleDC(pDC);
	dcFore.CreateCompatibleDC(pDC);

	// Load the bitmap.
	hbmpBack = (HBITMAP)LoadImage(AfxGetInstanceHandle(),
		MAKEINTRESOURCE(uIDBack),
		IMAGE_BITMAP,
		rect.Width(),
		rect.Height(),
		0);
	ASSERT(hbmpBack);
	hbmpFore = (HBITMAP)LoadImage(AfxGetInstanceHandle(),
		MAKEINTRESOURCE(uIDFore),
		IMAGE_BITMAP,
		0,
		0,
		0);
	ASSERT(hbmpFore);

	// Attach bitmap handle to bitmap object.
	bmpBack.Attach(hbmpBack);
	bmpFore.Attach(hbmpFore);

	// Get the information of the foreground bitmap.
	bmpFore.GetBitmap(&bmpinfo);
	
	// Select the bitmap object to the memory dc
	bmpOldBack = dcBack.SelectObject(&bmpBack);
	bmpOldFore = dcFore.SelectObject(&bmpFore);

	// Combine the foreground bitmap with the background bitmap.
	dcBack.BitBlt((rect.Width() - bmpinfo.bmWidth)/2,
				(rect.Height() - bmpinfo.bmHeight)/2,
				bmpinfo.bmWidth,
				bmpinfo.bmHeight,
				&dcFore,
				0,
				0,
				SRCAND);
	
	// Select the bitmap object out of the memory dc, and detach
	// the windows GDI object(bitmap) from the bitmap object.
	// (windows GDI object must be detached before used!)
	dcBack.SelectObject(bmpOldBack);
	dcFore.SelectObject(bmpOldFore);
	bmpBack.Detach();
	bmpFore.Detach();
	
	// Set the button bitmap.
	this->SetBitmap(hbmpBack);

	// Delete the bitmap object & the memory dc.
	bmpBack.DeleteObject();
	bmpFore.DeleteObject();
	dcBack.DeleteDC();
	dcFore.DeleteDC();
}

BEGIN_MESSAGE_MAP(CPicButton, CButton)
	//{{AFX_MSG_MAP(CPicButton)
		// NOTE - the ClassWizard will add and remove mapping macros here.
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CPicButton message handlers