transparentwnd.cpp

wince透明窗口,类似于音量控制窗体,始终置于顶层,采用区域裁减算法生成

//********************************************************************************
//* TransparentWindow.CPP
//*
//* A transparent window class.
//*
//* Based on the idea of Jason Wylie
//*
//* (C) 1998 by Franz Polzer
//*
//* Visit me at:	stud1.tuwien.ac.at/~e9225140
//* Write to me:	[e-mail]
//********************************************************************************

#include "stdafx.h"
#include "TransparentWnd.h"

#include <assert.h>

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
//#define WM_NCLBUTTONDOWN                0x00A1

//********************************************************************************
//* Constructor
//********************************************************************************

CTransparentWnd::CTransparentWnd()
{
}


//********************************************************************************
//* Destructor
//********************************************************************************

CTransparentWnd::~CTransparentWnd()
{
}


BEGIN_MESSAGE_MAP(CTransparentWnd, CWnd)
	//{{AFX_MSG_MAP(CTransparentWnd)
	ON_WM_PAINT()
	ON_WM_ERASEBKGND()
	ON_WM_LBUTTONDOWN()
	ON_WM_TIMER()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()


//********************************************************************************
//* CreateTransparent()
//*
//* Creates the main application window transparent
//********************************************************************************

void CTransparentWnd::CreateTransparent(CTransparentWnd *pParent,LPCTSTR pTitle, RECT &rect, unsigned short MaskID, unsigned short BitmapID)
{
	CreateEx(	pParent?0:WS_EX_TOPMOST,
						AfxRegisterWndClass(0),
						pTitle,
						WS_POPUP | WS_SYSMENU ,
						rect,
						pParent?pParent:NULL,
						NULL,
						NULL );
	SetupRegion(GetWindowDC(), MaskID);
	m_BitmapID = BitmapID;
	SetTimer(1,1000,NULL);

}


//********************************************************************************
//* SetupRegion()
//*
//* Set the Window Region for transparancy outside the mask region
//********************************************************************************
int vol = 3;
void CTransparentWnd::SetupRegion(CDC *pDC, unsigned short MaskID)
{
	CRect				cRect;
	int					x, y;
	CRgn				wndRgn, rgnTemp;

	GetWindowRect(&cRect);
	RECT rc = {0,0,20,30};
	wndRgn.CreateRectRgn(0, 0, cRect.Width(), cRect.Height());
	{
					rc.top = 1;
			rc.bottom = 29;

		for(int i = vol;i<10;i++)
		{
			rc.left = 30*i+1;
			rc.right = rc.left + 17;
			rgnTemp.CreateRectRgnIndirect(&rc);
					wndRgn.CombineRgn(&wndRgn, &rgnTemp, RGN_XOR);
					rgnTemp.DeleteObject();
		}
		rc.top = 0;
			rc.bottom = 30;
		for(i = 0;i<10;i++)
		{
			rc.left = 30*i+19;
			rc.right = rc.left + 11;
			rgnTemp.CreateRectRgnIndirect(&rc);
					wndRgn.CombineRgn(&wndRgn, &rgnTemp, RGN_XOR);
					rgnTemp.DeleteObject();
		}

	}
	SetWindowRgn((HRGN)wndRgn, TRUE);
}


//********************************************************************************
//* CTransparentWnd message handlers
//********************************************************************************

void CTransparentWnd::OnLButtonDown(UINT nFlags, CPoint point) 
{
	CWnd::OnLButtonDown(nFlags, point);
//	PostMessage(WM_NCLBUTTONDOWN, HTCAPTION, MAKELPARAM(point.x,point.y));
}

BOOL CTransparentWnd::OnEraseBkgnd(CDC* pDC) 
{
	CRect	rect;

	GetWindowRect(&rect);

	CDC memDC;
	CBitmap			cBitmap;
	CBitmap*		pOldMemBmp = NULL;

	cBitmap.LoadBitmap(m_BitmapID);
	memDC.CreateCompatibleDC(pDC);
	pOldMemBmp = memDC.SelectObject(&cBitmap);
	pDC->BitBlt(0, 0, rect.Width(), rect.Height(), &memDC, 0, 0, SRCCOPY);

	if (pOldMemBmp) memDC.SelectObject( pOldMemBmp );

	return TRUE;
}

void CTransparentWnd::OnPaint()
{
	CPaintDC dc(this);
	CBrush brush;
	int i;
	RECT rc = {0,0,20,30};
//	CWnd *pParent = GetParent();
//	OnEraseBkgnd(&dc);

//	if(!m_MaskID)
//	{
		
	brush.CreateSolidBrush(RGB(0,255,50));
	for(i=0;i<vol;i++)
	{
		rc.left = 30*i;
		rc.right = rc.left + 18;
		dc.FillRect(&rc,&brush);
	}
/*	for(i = vol;i<10;i++)
	{
		rc.left = 30*i;
		rc.right = rc.left + 18;
		dc.Draw3dRect(&rc,RGB(50,255,50),RGB(0,210,50));
	}
*/
//	}

//	else
//		OnEraseBkgnd(&dc);
	// Add your drawing code here!
}

int incr = 1;
void CTransparentWnd::OnTimer(UINT nIDEvent) 
{
	// TODO: Add your message handler code here and/or call default

	{
		HRGN hRgn;
		//CRgn *wndRgn;
		GetWindowRgn(hRgn);
		DeleteObject(hRgn);
		//wndRgn = (CRgn*)hRgn;
		//wndRgn->DeleteObject();
		vol=vol+incr;
		if(vol == 10)
			incr = -1;
		if(vol == 0)
			incr = 1;
		SetupRegion(GetWindowDC(), 0);
	}
	CWnd::OnTimer(nIDEvent);
}