mypreviewview.cpp

vc++的技巧查找方式源代码。

// MyPreviewView.cpp : implementation file
//
// Replaces MFC print preview toolbar with a prettier one
//
// Copyright (c) 1999 Robin J. Leatherbarrow, Erithacus Software Limited
// 
// Use and distribute freely, except: don't remove my name from the
// source or documentation; mark your changes; don't alter
// or remove this notice.
// No warranty of any kind, express or implied, is included with this
// software; use at your own risk, responsibility for damages (if any) to
// anyone resulting from the use of this software rests entirely with the
// user.
//
// Send bug reports, bug fixes, enhancements, requests, etc.,
// and I'll try to keep a version up to date.  I can be reached at:
//    [e-mail]
//
// Resource Requirements:
//		Bitmap resources: IDB_PREV_* (see resource file)
//		Dialog resource:  IDD_PREVIEW
//		String resources: AFX_ID_PREVIEW_* (see resource file)
//
// Other requirements:
//		MappedBitmapButton.cpp, .h
//
// Usage: 
//		1. #include "MyPreviewView.h" into your view class
//		2. Add MyPreviewView.cpp and MappedBitmapButton.cpp to your project
//		3. Copy the above resources to your .RC file
//		4. Add the following message handler to your view class
//		   When called you get the improved print preview
//
//void CYourView::OnFileImprovedprintpreview() 
//{
//	// need to use CMyPreviewView class
//	CPrintPreviewState* pState = new CPrintPreviewState;
//
//	if (!DoPrintPreview(IDD_PREVIEW, this, RUNTIME_CLASS(CMyPreviewView), pState))
//	{
//		TRACE0("Error: OnFileImprovedprintpreview failed.\n");
//		AfxMessageBox(AFX_IDP_COMMAND_FAILURE);
//		delete pState;      // preview failed to initialize, delete State now
//	}
//}
//
// Known issues
// ------------
// The version of CMappedBitmapButton supplied in this sample code uses
// CBitmap::LoadMappedBitmap to map system colors, which in turn uses ::CreateMappedBitmap
// to do the mapping.
// We have found that calls to ::CreateMappedBitmap can very occasionally cause NT4 to crash for
// no good reason, and so in our production code we use a "home made" LoadMappedBitmap
// replacement. 


#include "stdafx.h"
#include "afxpriv.h"
#include "afxres.h"
#include "MyPreviewView.h"
#include "resource.h"

IMPLEMENT_DYNCREATE(CMyPreviewView, CPreviewView)

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

/////////////////////////////////////////////////////////////////////////////
// CMyPreviewView


CMyPreviewView::CMyPreviewView()
{
}

CMyPreviewView::~CMyPreviewView()
{
}

void CMyPreviewView::OnDisplayPageNumber(UINT nPage, UINT nPagesDisplayed)
{
	CPreviewView::OnDisplayPageNumber(nPage, nPagesDisplayed);
}

void CMyPreviewView::OnPreviewPrint()
{
	CPreviewView::OnPreviewPrint();
}

BEGIN_MESSAGE_MAP(CMyPreviewView, CPreviewView)
	//{{AFX_MSG_MAP(CMyPreviewView)
	ON_WM_CREATE()
	//}}AFX_MSG_MAP
	ON_COMMAND(AFX_ID_PREVIEW_PRINT, OnPreviewPrint)
	ON_UPDATE_COMMAND_UI(AFX_ID_PREVIEW_NUMPAGE, OnUpdateNumPageChange)
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CMyPreviewView drawing

/////////////////////////////////////////////////////////////////////////////
// CMyPreviewView diagnostics

#ifdef _DEBUG
void CMyPreviewView::AssertValid() const
{
	CPreviewView::AssertValid();
}

void CMyPreviewView::Dump(CDumpContext& dc) const
{
	CPreviewView::Dump(dc);
}
#endif //_DEBUG

/////////////////////////////////////////////////////////////////////////////
// CMyPreviewView message handlers

void CMyPreviewView::OnUpdateNumPageChange(CCmdUI* pCmdUI)
{
	UINT nPages = m_nZoomState == ZOOM_OUT ? m_nPages : m_nZoomOutPages;

	if(m_bOne)
	{
		if(nPages == 1)
		{
			// need to swap to show 2 pages
			m_onetwo.LoadBitmap(IDB_PREV_TWO);
			m_bOne = FALSE;
			m_onetwo.Invalidate();
		}
	}
	else
	{
		if (nPages != 1)
		{
			// need to swap to show 1 page
			m_onetwo.LoadBitmap(IDB_PREV_ONE);
			m_bOne = TRUE;
			m_onetwo.Invalidate();
		}
	}

	// enable it only if valid to display another page and not zoomed
	pCmdUI->Enable(m_nZoomState == ZOOM_OUT && m_nMaxPages != 1 &&
		(m_pPreviewInfo->GetMaxPage() > 1 || m_nPages > 1));
}

int CMyPreviewView::OnCreate(LPCREATESTRUCT lpCreateStruct) 
{
	if (CPreviewView::OnCreate(lpCreateStruct) == -1)
		return -1;

	m_pToolBar->EnableToolTips(TRUE);

	m_bOne = FALSE;		 // the default is to show 2 pages, set in the dialog text

	m_print.AutoLoad(AFX_ID_PREVIEW_PRINT, m_pToolBar, IDB_PREV_PRINT);
	m_next.AutoLoad(AFX_ID_PREVIEW_NEXT, m_pToolBar, IDB_PREV_NEXT);
	m_previous.AutoLoad(AFX_ID_PREVIEW_PREV, m_pToolBar, IDB_PREV_PREVIOUS);
	m_onetwo.AutoLoad(AFX_ID_PREVIEW_NUMPAGE, m_pToolBar, IDB_PREV_TWO);
	m_zoomIn.AutoLoad(AFX_ID_PREVIEW_ZOOMIN, m_pToolBar, IDB_PREV_ZOOMIN);
	m_zoomOut.AutoLoad(AFX_ID_PREVIEW_ZOOMOUT, m_pToolBar, IDB_PREV_ZOOMOUT);
	
	return 0;
}