pictctrl.cpp

全屏显示的VC++源代码,简单实用。代码用VC++6.0编写。

////////////////////////////////////////////////////////////////
// If this code works, it was written by Paul DiLascia.
// If not, I don't know who wrote it.
// Compiles with Visual C++ 6.0 for Windows 98 and probably Windows 2000 too.
// Set tabsize = 3 in your editor.
//
#include "StdAfx.h"
#include "PictCtrl.h"

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

////////////////////////////////////////////////////////////////
// CPictureCtrl is like a static bitmap, but displays any kind of
// image -- BMP, JPG, or GIF.
//
IMPLEMENT_DYNAMIC(CPictureCtrl, CStaticLink)
BEGIN_MESSAGE_MAP(CPictureCtrl, CStaticLink)
	ON_WM_CREATE()
	ON_WM_PAINT()
	ON_WM_ERASEBKGND()
END_MESSAGE_MAP()

CPictureCtrl::CPictureCtrl(BOOL bAutoLoadImage)
	: m_bAutoLoadImage(bAutoLoadImage)
{
}

CPictureCtrl::~CPictureCtrl()
{
}

//////////////////
// Created: load picture with same ID as me, if there is one. In theory, this
// should not be required because PreSubclassWindow is called whether the
// control is created directly or subclassed from a dialog--but for some odd
// reason unbeknowst to me, GetDlgCtrlID always returns 0 in OnCreate. Go
// figure.
//
int CPictureCtrl::OnCreate(LPCREATESTRUCT lpcs)
{
	if (CStaticLink::OnCreate(lpcs)!=0)
		return -1;
	int nID = GetDlgCtrlID();
	if (m_bAutoLoadImage && nID > 0 && !m_pict) {
		LoadImage(nID);
	}
	return 0;
}

//////////////////
// Subclassed: load picture with same ID as me, if there is one.
//
void CPictureCtrl::PreSubclassWindow()
{
	int nID = GetDlgCtrlID();
	if (m_bAutoLoadImage && nID > 0 && !m_pict) {
		LoadImage(nID);
	}
	CString s;
	SetNoLink(!s.LoadString(GetDlgCtrlID()));
}

//////////////////
// Paint the picture -- override static stuff and do my own thing.
// Call CPicture to to the work. 
//
void CPictureCtrl::OnPaint()
{
	CPaintDC dc(this);
	if (m_pict) {
		CRect rcClient;
		GetClientRect(&rcClient);
		CRect rcImage(CPoint(0,0),m_pict.GetImageSize());
		CRect rc;
		rc.IntersectRect(&rcImage, &rcClient);
		m_pict.Render(&dc, rc);
	}
}

//////////////////
// If picture is smaller than client area, paint extra with background color.
// 
BOOL CPictureCtrl::OnEraseBkgnd(CDC* pDC)
{
	// get client rectangle
	CRect rcClient;
	GetClientRect(&rcClient);
	CRect rc = rcClient;

	// get image rectangle
	CRect rcImage(CPoint(0,0), m_pict.GetImageSize());

	// create clipping region
	CRgn clipRgn;
	clipRgn.CreateRectRgnIndirect(&rcClient);
	pDC->SelectClipRgn(&clipRgn);
	pDC->ExcludeClipRect(&rcImage);

	CBrush *pBrush =
		CBrush::FromHandle((HBRUSH)GetWindowLong(m_hWnd, GCL_HBRBACKGROUND));
	pDC->FillRect(&rcClient, pBrush);
	pDC->SelectClipRgn(NULL);

	return TRUE;
}