bmpstatic.cpp

在WCE4.2下面用EVC开发的一个带图型界面的音乐播放器,带音乐播放的一般功能,如快进快退,拖动,音量拖动调节,等功能,不到歌词显示功能,

// BmpStatic.cpp : implementation file
//

#include "stdafx.h"
#include "musicplayer.h"
#include "BmpStatic.h"

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

/////////////////////////////////////////////////////////////////////////////
// CBmpStatic

CBmpStatic::CBmpStatic()
{
	m_InitDC = FALSE;
	m_ImageID = IDB_MUSIC_WND;
	m_TxtFormat = DT_CENTER|DT_VCENTER;
}

CBmpStatic::~CBmpStatic()
{
	m_BackgroundDC.DeleteDC();
	m_txtFont.DeleteObject();
}


BEGIN_MESSAGE_MAP(CBmpStatic, CStatic)
	//{{AFX_MSG_MAP(CBmpStatic)
	ON_WM_ERASEBKGND()
	ON_WM_PAINT()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CBmpStatic message handlers

BOOL CBmpStatic::OnEraseBkgnd(CDC* pDC) 
{
	// TODO: Add your message handler code here and/or call default
	if (!m_InitDC && m_ImageID)
	{
		// 建立临时对象从资源中加载图片
		CDC tmpDC;
		tmpDC.CreateCompatibleDC(NULL);
		
		CBitmap tmpBmp;
		tmpBmp.LoadBitmap(m_ImageID);
		tmpDC.SelectObject(&tmpBmp);
		
		tmpBmp.DeleteObject();
		
		// 计算按钮在窗口内的位置
		CRect rect;
		GetClientRect(&rect);
		
		// 获取按钮的宽和高
		int cx = rect.Width();
		int cy = rect.Height();
		
		// 主/子窗体矩形区域
		CRect mainWnd;
		CRect subWnd;
		
		// 获取父窗体矩形
		CWnd *pWnd = GetParent();
		pWnd->GetWindowRect(&mainWnd);
		
		// 获取按钮矩形
		GetWindowRect(&subWnd);
		
		// 计算相对位置
		CPoint tpLeft;
		tpLeft.x = subWnd.TopLeft().x - mainWnd.TopLeft().x;
		tpLeft.y = subWnd.TopLeft().y - mainWnd.TopLeft().y;
		
		// 复制图片到内存中
		tmpBmp.CreateCompatibleBitmap(&tmpDC,cx,cy);
		
		m_BackgroundDC.CreateCompatibleDC(NULL);
		m_BackgroundDC.SelectObject(&tmpBmp);
		
		m_BackgroundDC.BitBlt(0,0,cx,cy,&tmpDC,tpLeft.x,tpLeft.y,SRCCOPY);
		
		// 清理资源
		tmpDC.DeleteDC();
		tmpBmp.DeleteObject();
		
		m_InitDC = true;
	}
	return TRUE;
	//return CStatic::OnEraseBkgnd(pDC);
}

void CBmpStatic::OnPaint() 
{
	CPaintDC dc(this); // device context for painting
	
	// TODO: Add your message handler code here
	CRect rc;
	GetClientRect(&rc);

	CDC tmpDC;
	CBitmap tmpBmp;

	tmpBmp.CreateCompatibleBitmap(&dc,320,240);
	tmpDC.CreateCompatibleDC(&dc);
	tmpDC.SelectObject(&tmpBmp);
	tmpDC.SelectObject(&m_txtFont);
	tmpDC.SetBkMode(TRANSPARENT);		
	tmpDC.SetTextColor(RGB(255,100,255));
	tmpDC.BitBlt(0,0,rc.Width(),rc.Height(),&m_BackgroundDC,0,0,SRCCOPY);

	CString str;
	GetWindowText(str);
	
	tmpDC.DrawText(str,&rc,m_TxtFormat);

	dc.BitBlt(0,0,rc.Width(),rc.Height(),&tmpDC,0,0,SRCCOPY);

	tmpDC.DeleteDC();
	tmpBmp.DeleteObject();
	// Do not call CStatic::OnPaint() for painting messages
}

void CBmpStatic::LoadBgBmp(int nBmpID)
{
	m_ImageID = nBmpID;	
}

void CBmpStatic::SetTxtFont(int nFont)
{
	m_txtFont.DeleteObject();

	switch(nFont)
	{
	case 0:
		m_txtFont.CreateFont(20,0,0,0,FW_NORMAL,0,0,0,ANSI_CHARSET,OUT_DEFAULT_PRECIS,
			CLIP_DEFAULT_PRECIS,DEFAULT_QUALITY,DEFAULT_PITCH|FF_SWISS,_T("Tahoma"));
		m_TxtFormat = DT_CENTER|DT_BOTTOM;
		break;
	case 1:
		m_txtFont.CreateFont(20,0,0,0,FW_NORMAL,0,0,0,ANSI_CHARSET,OUT_DEFAULT_PRECIS,
			CLIP_DEFAULT_PRECIS,DEFAULT_QUALITY,DEFAULT_PITCH|FF_SWISS,_T("Tahoma"));
		m_TxtFormat = DT_RIGHT|DT_BOTTOM;
		break;
	case 2:
		m_txtFont.CreateFont(20,0,0,0,FW_NORMAL,0,0,0,ANSI_CHARSET,OUT_DEFAULT_PRECIS,
			CLIP_DEFAULT_PRECIS,DEFAULT_QUALITY,DEFAULT_PITCH|FF_SWISS,_T("Tahoma"));
		m_TxtFormat = DT_LEFT|DT_BOTTOM;
		break;
	default:
	    break;

	}
}