viewprev.cpp

vc6.0完整版

// This is a part of the Microsoft Foundation Classes C++ library.
// Copyright (C) 1992-1998 Microsoft Corporation
// All rights reserved.
//
// This source code is only intended as a supplement to the
// Microsoft Foundation Classes Reference and related
// electronic documentation provided with the library.
// See these sources for detailed information regarding the
// Microsoft Foundation Classes product.

#include "stdafx.h"

#ifdef AFX_PRINT_SEG
#pragma code_seg(AFX_PRINT_SEG)
#endif

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

BOOL CALLBACK _AfxPreviewCloseProc(CFrameWnd* pFrameWnd);

/////////////////////////////////////////////////////////////////////////////
// CPrintPreviewState helper structure

CPrintPreviewState::CPrintPreviewState()
{
	// set defaults
	nIDMainPane = AFX_IDW_PANE_FIRST;
	dwStates = AFX_CONTROLBAR_MASK(AFX_IDW_STATUS_BAR);
						// status bar visible if available
	lpfnCloseProc = _AfxPreviewCloseProc;
						// set frame hook so closing the frame window
						//  when in preview state will just end the mode
	hMenu = NULL;
	pViewActiveOld = NULL;
	hAccelTable = NULL;
}

/////////////////////////////////////////////////////////////////////////////
// CView's OnPrintPreview.  Here to force linkage

void CView::OnFilePrintPreview()
{
	// In derived classes, implement special window handling here
	// Be sure to Unhook Frame Window close if hooked.

	// must not create this on the frame.  Must outlive this function
	CPrintPreviewState* pState = new CPrintPreviewState;

	// DoPrintPreview's return value does not necessarily indicate that
	// Print preview succeeded or failed, but rather what actions are necessary
	// at this point.  If DoPrintPreview returns TRUE, it means that
	// OnEndPrintPreview will be (or has already been) called and the
	// pState structure will be/has been deleted.
	// If DoPrintPreview returns FALSE, it means that OnEndPrintPreview
	// WILL NOT be called and that cleanup, including deleting pState
	// must be done here.

	if (!DoPrintPreview(AFX_IDD_PREVIEW_TOOLBAR, this,
							RUNTIME_CLASS(CPreviewView), pState))
	{
		// In derived classes, reverse special window handling here for
		// Preview failure case

		TRACE0("Error: DoPrintPreview failed.\n");
		AfxMessageBox(AFX_IDP_COMMAND_FAILURE);
		delete pState;      // preview failed to initialize, delete State now
	}
}

BOOL CView::DoPrintPreview(UINT nIDResource, CView* pPrintView,
	CRuntimeClass* pPreviewViewClass, CPrintPreviewState* pState)
{
	ASSERT_VALID_IDR(nIDResource);
	ASSERT_VALID(pPrintView);
	ASSERT(pPreviewViewClass != NULL);
	ASSERT(pPreviewViewClass->IsDerivedFrom(RUNTIME_CLASS(CPreviewView)));
	ASSERT(pState != NULL);

	CFrameWnd* pParent = STATIC_DOWNCAST(CFrameWnd, AfxGetMainWnd());
	ASSERT_VALID(pParent);

	CCreateContext context;
	context.m_pCurrentFrame = pParent;
	context.m_pCurrentDoc = GetDocument();
	context.m_pLastView = this;

	// Create the preview view object
	CPreviewView* pView = (CPreviewView*)pPreviewViewClass->CreateObject();
	if (pView == NULL)
	{
		TRACE0("Error: Failed to create preview view.\n");
		return FALSE;
	}
	ASSERT_KINDOF(CPreviewView, pView);
	pView->m_pPreviewState = pState;        // save pointer

	pParent->OnSetPreviewMode(TRUE, pState);    // Take over Frame Window

	// Create the toolbar from the dialog resource
	pView->m_pToolBar = new CDialogBar;
	if (!pView->m_pToolBar->Create(pParent, MAKEINTRESOURCE(nIDResource),
		CBRS_TOP, AFX_IDW_PREVIEW_BAR))
	{
		TRACE0("Error: Preview could not create toolbar dialog.\n");
		pParent->OnSetPreviewMode(FALSE, pState);   // restore Frame Window
		delete pView->m_pToolBar;       // not autodestruct yet
		pView->m_pToolBar = NULL;
		pView->m_pPreviewState = NULL;  // do not delete state structure
		delete pView;
		return FALSE;
	}
	pView->m_pToolBar->m_bAutoDelete = TRUE;    // automatic cleanup

	// Create the preview view as a child of the App Main Window.  This
	// is a sibling of this view if this is an SDI app.  This is NOT a sibling
	// if this is an MDI app.

	if (!pView->Create(NULL, NULL, AFX_WS_DEFAULT_VIEW,
		CRect(0,0,0,0), pParent, AFX_IDW_PANE_FIRST, &context))
	{
		TRACE0("Error: couldn't create preview view for frame.\n");
		pParent->OnSetPreviewMode(FALSE, pState);   // restore Frame Window
		pView->m_pPreviewState = NULL;  // do not delete state structure
		delete pView;
		return FALSE;
	}

	// Preview window shown now

	pState->pViewActiveOld = pParent->GetActiveView();
	CView* pActiveView = pParent->GetActiveFrame()->GetActiveView();
	if (pActiveView != NULL)
		pActiveView->OnActivateView(FALSE, pActiveView, pActiveView);

	if (!pView->SetPrintView(pPrintView))
	{
		pView->OnPreviewClose();
		return TRUE;            // signal that OnEndPrintPreview was called
	}

	pParent->SetActiveView(pView);  // set active view - even for MDI

	// update toolbar and redraw everything
	pView->m_pToolBar->SendMessage(WM_IDLEUPDATECMDUI, (WPARAM)TRUE);
	pParent->RecalcLayout();            // position and size everything
	pParent->UpdateWindow();

	return TRUE;
}

BOOL CALLBACK _AfxPreviewCloseProc(CFrameWnd* pFrameWnd)
{
	ASSERT_VALID(pFrameWnd);

	CPreviewView* pView = (CPreviewView*) pFrameWnd->GetDlgItem(AFX_IDW_PANE_FIRST);
	ASSERT_KINDOF(CPreviewView, pView);

	pView->OnPreviewClose();
	return FALSE;
}

/////////////////////////////////////////////////////////////////////////////
// Preview View

BEGIN_MESSAGE_MAP(CPreviewView, CScrollView)
	//{{AFX_MSG_MAP(CPreviewView)
	ON_WM_SIZE()        // overriding CScrollView
	ON_WM_CREATE()

	ON_COMMAND(AFX_ID_PREVIEW_CLOSE, OnPreviewClose)
	ON_COMMAND(AFX_ID_PREVIEW_NUMPAGE, OnNumPageChange)
	ON_COMMAND(AFX_ID_PREVIEW_NEXT, OnNextPage)
	ON_COMMAND(AFX_ID_PREVIEW_PREV, OnPrevPage)
	ON_COMMAND(AFX_ID_PREVIEW_PRINT, OnPreviewPrint)
	ON_COMMAND(AFX_ID_PREVIEW_ZOOMIN, OnZoomIn)
	ON_COMMAND(AFX_ID_PREVIEW_ZOOMOUT, OnZoomOut)

	ON_UPDATE_COMMAND_UI(AFX_ID_PREVIEW_NUMPAGE, OnUpdateNumPageChange)
	ON_UPDATE_COMMAND_UI(AFX_ID_PREVIEW_NEXT, OnUpdateNextPage)
	ON_UPDATE_COMMAND_UI(AFX_ID_PREVIEW_PREV, OnUpdatePrevPage)
	ON_UPDATE_COMMAND_UI(AFX_ID_PREVIEW_ZOOMIN, OnUpdateZoomIn)
	ON_UPDATE_COMMAND_UI(AFX_ID_PREVIEW_ZOOMOUT, OnUpdateZoomOut)

	ON_WM_VSCROLL()
	ON_WM_HSCROLL()
	ON_WM_LBUTTONDOWN()
	ON_WM_ERASEBKGND()
	ON_WM_SETCURSOR()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

CPreviewView::CPreviewView()
{
	m_pPrintView = NULL;
	m_pOrigView = NULL;
	m_pPreviewInfo = NULL;
	m_pPreviewDC = NULL;
	m_pPreviewState = NULL;
	m_hMagnifyCursor = NULL;
	m_bPageNumDisplayed = FALSE;
	m_nZoomState = ZOOM_OUT;

	// default to pointing to embedded array.  Allows for 2 pages
	m_pPageInfo = m_pageInfoArray;
	m_nMaxPages = 2;

	// initialize CScrollView members
	m_bCenter = TRUE;                   // Center Zoomed output in Scrollview
	m_nMapMode = MM_TEXT;
}

CPreviewView::PAGE_INFO::PAGE_INFO()
{
}

CPreviewView::~CPreviewView()
{
	m_dcPrint.Detach();         // print DC is deleted by CPrintInfo destructor

	delete m_pPreviewInfo;      // get rid of preview info
	delete m_pPreviewState;     // Get rid of preview state
	delete m_pPreviewDC;        // Get rid of preview DC object

	if (m_hMagnifyCursor != NULL)
	{
		// make sure that m_hMagnifyCursor isn't the current cursor when we destroy it
		::SetCursor(::LoadCursor(NULL, IDC_ARROW));
		DestroyCursor(m_hMagnifyCursor);
	}
}

int CPreviewView::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
	int retVal = CView::OnCreate(lpCreateStruct);
	if (retVal == -1)
		return -1;      // if -1 bag out

	CCreateContext* pContext = (CCreateContext*)lpCreateStruct->lpCreateParams;

	m_pOrigView = pContext->m_pLastView;
	ASSERT(m_pOrigView != NULL);
	ASSERT_KINDOF(CView, m_pOrigView);

	return retVal;
}

BOOL CPreviewView::SetPrintView(CView* pPrintView)
{
	ASSERT_VALID(pPrintView);

	m_pPrintView = pPrintView;

	// allocate preview info
	m_pPreviewInfo = new CPrintInfo;
	m_pPreviewInfo->m_pPD->SetHelpID(AFX_IDD_PRINTSETUP);
	m_pPreviewInfo->m_pPD->m_pd.Flags |= PD_PRINTSETUP;
	m_pPreviewInfo->m_pPD->m_pd.Flags &= ~PD_RETURNDC;

	m_pPreviewInfo->m_bPreview = TRUE;  // signal that this is preview
	ASSERT(m_pPreviewInfo->m_pPD != NULL);

	m_pPreviewDC = new CPreviewDC;      // must be created before any
										// possible error returns

	if (!m_pPrintView->OnPreparePrinting(m_pPreviewInfo))
		return FALSE;

#ifdef _DEBUG
	if (m_pPreviewInfo->m_pPD->m_pd.hDC == NULL)
	{
		TRACE0("Error: hDC not set for printing --\n");
		TRACE0("\tDid you remember to call DoPreparePrinting?\n");
		ASSERT(FALSE);      // common mistake gets trapped here
	}
#endif //_DEBUG

	m_dcPrint.Attach(m_pPreviewInfo->m_pPD->m_pd.hDC);
	m_pPreviewDC->SetAttribDC(m_pPreviewInfo->m_pPD->m_pd.hDC);
	m_pPreviewDC->m_bPrinting = TRUE;
	m_dcPrint.m_bPrinting = TRUE;

	m_dcPrint.SaveDC();     // Save pristine state of DC

	HDC hDC = ::GetDC(m_hWnd);
	m_pPreviewDC->SetOutputDC(hDC);
	m_pPrintView->OnBeginPrinting(m_pPreviewDC, m_pPreviewInfo);
	m_pPreviewDC->ReleaseOutputDC();
	::ReleaseDC(m_hWnd, hDC);

	m_dcPrint.RestoreDC(-1);    // restore to untouched state

	// Get Pixels per inch from Printer
	m_sizePrinterPPI.cx = m_dcPrint.GetDeviceCaps(LOGPIXELSX);
	m_sizePrinterPPI.cy = m_dcPrint.GetDeviceCaps(LOGPIXELSY);

	m_nPages = m_pPreviewInfo->m_nNumPreviewPages;
	if (m_nPages == 0)
		m_nPages = 1;
	else if (m_nPages > m_nMaxPages)
		m_nPages = m_nMaxPages;     // Sanity Check!

	m_nZoomOutPages = m_nPages;

	SetScrollSizes(MM_TEXT, CSize(1, 1));   // initialize mapping mode only

	if (m_pPreviewInfo->GetMaxPage() < 0x8000 &&
		m_pPreviewInfo->GetMaxPage() - m_pPreviewInfo->GetMinPage() <= 32767U)
	{
		SCROLLINFO info;
		info.fMask = SIF_PAGE|SIF_RANGE;
		info.nMin = m_pPreviewInfo->GetMinPage();
		info.nMax = m_pPreviewInfo->GetMaxPage();
		info.nPage = 1;
		if (!SetScrollInfo(SB_VERT, &info, FALSE))
			SetScrollRange(SB_VERT, info.nMin, info.nMax, FALSE);
	}
	else
		ShowScrollBar(SB_VERT, FALSE);      // if no range specified, or too
											// large don't show

	SetCurrentPage(m_pPreviewInfo->m_nCurPage, TRUE);
	return TRUE;
}

void CPreviewView::OnSize(UINT nType, int cx, int cy)
{
	// CScrollView handles everything if zoomed in.
	if (m_nZoomState == ZOOM_OUT)
	{
		// Force recalc of scale ratios on next draw
		for (UINT i = 0; i < m_nMaxPages; i++)
			m_pPageInfo[i].sizeScaleRatio.cx = 0;           // zero scale ratios

		CView::OnSize(nType, cx, cy);       // No scroll functionality
	}
	else
	{
		// adjust scroll size to size of page
		m_pageDev.cx = cx;
		m_pageDev.cy = cy;
		m_lineDev.cx = cx / 10;
		m_lineDev.cy = cy / 10;
		CScrollView::OnSize(nType, cx, cy);
	}
}

void CPreviewView::OnActivateView(BOOL bActivate, CView*, CView*)
{
	if (bActivate)
	{
		CWnd* pFocusWnd = GetFocus();
		if (pFocusWnd == NULL ||
			(m_pToolBar != NULL && !m_pToolBar->IsChild(pFocusWnd)))
		{
			// focus is not already on a toolbar button - set it to one
			m_pToolBar->GetDlgItem(AFX_ID_PREVIEW_PRINT)->SetFocus();
		}
	}
}

void CPreviewView::OnPreviewClose()