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Tricks of the Windows Gam…ming Gurus (2nd Edition)
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mfc
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viewprev.cpp
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1998-06-16
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// 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()
{
m_pToolBar->DestroyWindow();
m_pToolBar = NULL;
m_pPreviewInfo->m_nCurPage = m_nCurrentPage;
m_pOrigView->OnEndPrintPreview(m_pPreviewDC, m_pPreviewInfo,
CPoint(0, 0), this);
}
#define PREVIEW_MARGIN 8
#define PREVIEW_PAGEGAP 8
// Return is actually the fraction cx/cy. Simply using CSize for convenience
CSize CPreviewView::CalcScaleRatio(CSize screenSize, CSize actualSize)
{
// Test ratio based on vertical dimension to see if it is the one to use
int nNum = screenSize.cy;
int nDen = actualSize.cy;
// If scaled width too large, choose width as primary dimension
if (MulDiv(actualSize.cx, nNum, nDen) > screenSize.cx)
{
// wrong ratio--base on width
nNum = screenSize.cx;
nDen = actualSize.cx;
}
CSize ratio(nNum, nDen);
return ratio;
}
// Position Page...
// Generate a Screen MM_TEXT rectangle to enclose each page. Dimensions
// of the rectangle must be 1 pixel Above and Left of the top/left corner
// of the page and the rectangle width and height must be THREE pixels
// larger than page in order to provide the correct placement of the
// two pixel border.
//
// This routine is called once for each page with the preview DC set up for
// that page
void CPreviewView::PositionPage(UINT nPage)
{
CSize windowSize = CalcPageDisplaySize();
VERIFY(m_dcPrint.Escape(GETPHYSPAGESIZE, 0, NULL,
(LPVOID)&m_pPageInfo[nPage].sizeUnscaled));
CSize* pSize = &m_pPageInfo[nPage].sizeUnscaled;
// Convert page size to screen coordinates
pSize->cx = MulDiv(pSize->cx, afxData.cxPixelsPerInch, m_sizePrinterPPI.cx);
pSize->cy = MulDiv(pSize->cy, afxData.cyPixelsPerInch, m_sizePrinterPPI.cy);
m_pPageInfo[nPage].sizeZoomOutRatio = CalcScaleRatio(windowSize, *pSize);
SetScaledSize(nPage);
}
CSize CPreviewView::CalcPageDisplaySize()
// calculate the current page size
// set 'm_nSecondPageOffset' to start of second page
// return size of current page less margins
{
CSize windowSize, scrollSize;
GetTrueClientSize(windowSize, scrollSize);
// subtract out vertical scrollbar if zoomed out and page range is known
// and there is more than one page.
if (m_nZoomState == ZOOM_OUT && (m_pPreviewInfo->GetMaxPage() != 0xffff) &&
(m_pPreviewInfo->GetMaxPage() - m_pPreviewInfo->GetMinPage() != 0))
windowSize.cx -= scrollSize.cx;
m_nSecondPageOffset = (windowSize.cx - PREVIEW_MARGIN) / 2;
windowSize.cx = (m_nPages == 2) ? (windowSize.cx - 3*PREVIEW_MARGIN) / 2 :
windowSize.cx - 2*PREVIEW_MARGIN;
windowSize.cy -= 2*PREVIEW_MARGIN;
return windowSize;
}
void CPreviewView::SetScaledSize(UINT nPage)
{
CSize* pSize = &m_pPageInfo[nPage].sizeUnscaled;
CSize* pRatio = &m_pPageInfo[nPage].sizeScaleRatio;
CSize* pZoomOutRatio = &m_pPageInfo[nPage].sizeZoomOutRatio;
CSize windowSize = CalcPageDisplaySize();
BOOL bPaperLarger = pZoomOutRatio->cx < pZoomOutRatio->cy;
// whether the paper is larger than the screen, or vice versa
switch (m_nZoomState)
{
case ZOOM_OUT:
*pRatio = *pZoomOutRatio;
break;
case ZOOM_MIDDLE:
// the middle zoom state is a ratio between cx/cy and
// 1/1 (or cy/cy). It is, therefore:
//
// (cx + cy)/2
// -----------
// cy
//
// if the paper is larger than the screen, or
//
// (3*cx - cy)/2
// -------------
// cy
//
// if the paper is smaller than the screen.
if (bPaperLarger)
{
pRatio->cy = pZoomOutRatio->cy;
pRatio->cx = (pZoomOutRatio->cx + pRatio->cy) / 2;
}
else
{
pRatio->cy = pZoomOutRatio->cy;
pRatio->cx = (3*pZoomOutRatio->cx - pRatio->cy) / 2;
}
break;
case ZOOM_IN:
if (bPaperLarger)
pRatio->cx = pRatio->cy = 1;
else
{
// if the paper is smaller than the screen space we're displaying
// it in, then using a ratio of 1/1 will result in a smaller image
// on the screen, not a larger one. To get a larger image in this
// case we double the zoom out ratio.
pRatio->cy = pZoomOutRatio->cy;
pRatio->cx = 2*pZoomOutRatio->cx - pZoomOutRatio->cy;
}
break;
default:
ASSERT(FALSE);
}
// Convert to scaled size
CSize scaledSize;
scaledSize.cx = MulDiv(pSize->cx, pRatio->cx, pRatio->cy);
scaledSize.cy = MulDiv(pSize->cy, pRatio->cx, pRatio->cy);
CRect* pRect = &m_pPageInfo[nPage].rectScreen;
pRect->SetRect(PREVIEW_MARGIN, PREVIEW_MARGIN,
scaledSize.cx + PREVIEW_MARGIN + 3,
scaledSize.cy + PREVIEW_MARGIN + 3);
if (m_nZoomState == ZOOM_OUT)
{
pRect->OffsetRect((windowSize.cx - pRect->Size().cx) / 2 - 1,
(windowSize.cy - pRect->Size().cy) / 2 - 1);
if (nPage == 1)
pRect->OffsetRect(m_nSecondPageOffset, 0);
}
else
{
// set up scroll size
SetScrollSizes(MM_TEXT, pRect->Size() +
CSize(PREVIEW_MARGIN * 2, PREVIEW_MARGIN * 2), windowSize);
}
}
// Only use the PrepareDC from CScrollView if we are zoomed in
void CPreviewView::OnPrepareDC(CDC* pDC, CPrintInfo* pInfo)
{
ASSERT_VALID(pDC);
if (m_nZoomState == ZOOM_OUT)
CView::OnPrepareDC(pDC, pInfo);
else if (m_pPageInfo[0].sizeScaleRatio.cx != 0)
CScrollView::OnPrepareDC(pDC, pInfo);
}
BOOL CPreviewView::OnEraseBkgnd(CDC* pDC)
{
ASSERT_VALID(pDC);
// Fill background with APPWORKSPACE
CBrush backBrush(GetSysColor(COLOR_APPWORKSPACE));
CBrush* pOldBrush = pDC->SelectObject(&backBrush);
CRect rect;
pDC->GetClipBox(&rect); // Erase the area needed
pDC->PatBlt(rect.left, rect.top, rect.Width(), rect.Height(), PATCOPY);
pDC->SelectObject(pOldBrush);
return TRUE;
}
void CPreviewView::OnDraw(CDC* pDC)
{
ASSERT_VALID(pDC);
// don't do anything if not fully initialized
if (m_pPrintView == NULL || m_dcPrint.m_hDC == NULL)
return;
CPoint ViewportOrg = pDC->GetViewportOrg();
CPen rectPen;
rectPen.CreatePen(PS_SOLID, 2, GetSysColor(COLOR_WINDOWFRAME));
CPen shadowPen;
shadowPen.CreatePen(PS_SOLID, 3, GetSysColor(COLOR_BTNSHADOW));
m_pPreviewInfo->m_bContinuePrinting = TRUE; // do this once each paint
for (UINT nPage = 0; nPage < m_nPages; nPage++)
{
int nSavedState = m_dcPrint.SaveDC(); // Save pristine state of DC
// Use paint DC for print preview output
m_pPreviewDC->SetOutputDC(pDC->GetSafeHdc());
m_pPreviewInfo->m_nCurPage = m_nCurrentPage + nPage;
// Only call PrepareDC if within page range, otherwise use default
// rect to draw page rectangle
if (m_nCurrentPage + nPage <= m_pPreviewInfo->GetMaxPage())
m_pPrintView->OnPrepareDC(m_pPreviewDC, m_pPreviewInfo);
// Set up drawing rect to entire page (in logical coordinates)
m_pPreviewInfo->m_rectDraw.SetRect(0, 0,
m_pPreviewDC->GetDeviceCaps(HORZRES),
m_pPreviewDC->GetDeviceCaps(VERTRES));
m_pPreviewDC->DPtoLP(&m_pPreviewInfo->m_rectDraw);
// Draw empty page on screen
pDC->SaveDC(); // save the output dc state
CSize* pRatio = &m_pPageInfo[nPage].sizeScaleRatio;
CRect* pRect = &m_pPageInfo[nPage].rectScreen;
if (pRatio->cx == 0)
{ // page position has not been determined
PositionPage(nPage); // compute page position
if (m_nZoomState != ZOOM_OUT)
ViewportOrg = -GetDeviceScrollPosition();
}
pDC->SetMapMode(MM_TEXT); // Page Rectangle is in screen device coords
pDC->SetViewportOrg(ViewportOrg);
pDC->SetWindowOrg(0, 0);
pDC->SelectStockObject(HOLLOW_BRUSH);
pDC->SelectObject(&rectPen);
pDC->Rectangle(pRect);
pDC->SelectObject(&shadowPen);
pDC->MoveTo(pRect->right + 1, pRect->top + 3);
pDC->LineTo(pRect->right + 1, pRect->bottom + 1);
pDC->MoveTo(pRect->left + 3, pRect->bottom + 1);
pDC->LineTo(pRect->right + 1, pRect->bottom + 1);
// erase background to white (most paper is white)
CRect rectFill = *pRect;
rectFill.left += 1;
rectFill.top += 1;
rectFill.right -= 2;
rectFill.bottom -= 2;
::FillRect(pDC->m_hDC, rectFill, (HBRUSH)GetStockObject(WHITE_BRUSH));
pDC->RestoreDC(-1); // restore to synchronized state
if (!m_pPreviewInfo->m_bContinuePrinting ||
m_nCurrentPage + nPage > m_pPreviewInfo->GetMaxPage())
{
m_pPreviewDC->ReleaseOutputDC();
m_dcPrint.RestoreDC(nSavedState); // restore to untouched state
// if the first page is not displayable, back up one page
// but never go below 1
if (nPage == 0 && m_nCurrentPage > 1)
SetCurrentPage(m_nCurrentPage - 1, TRUE);
break;
}
// Display page number
OnDisplayPageNumber(m_nCurrentPage, nPage + 1);
// Set scale ratio for this page
m_pPreviewDC->SetScaleRatio(pRatio->cx, pRatio->cy);
CSize PrintOffset;
VERIFY(m_pPreviewDC->Escape(GETPRINTINGOFFSET, 0, NULL, (LPVOID)&PrintOffset));
m_pPreviewDC->PrinterDPtoScreenDP((LPPOINT)&PrintOffset);
PrintOffset += (CSize)pRect->TopLeft();
PrintOffset += CSize(1, 1);
PrintOffset += (CSize)ViewportOrg; // For Scrolling
m_pPreviewDC->SetTopLeftOffset(PrintOffset);
m_pPreviewDC->ClipToPage();
m_pPrintView->OnPrint(m_pPreviewDC, m_pPreviewInfo);
m_pPreviewDC->ReleaseOutputDC();
m_dcPrint.RestoreDC(nSavedState); // restore to untouched state
}
rectPen.DeleteObject();
shadowPen.DeleteObject();
}
void CPreviewView::OnHScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar)
{
if (m_nZoomState != ZOOM_OUT)
CScrollView::OnHScroll(nSBCode, nPos, pScrollBar);
}
void CPreviewView::OnVScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar)
{
if (m_nZoomState != ZOOM_OUT)
{
CScrollView::OnVScroll(nSBCode, nPos, pScrollBar);
return;
}
switch (nSBCode)
{
case SB_BOTTOM:
SetCurrentPage(m_pPreviewInfo->GetMaxPage(), TRUE);
break;
case SB_TOP:
SetCurrentPage(m_pPreviewInfo->GetMinPage(), TRUE);
break;
case SB_PAGEDOWN:
SetCurrentPage(m_nCurrentPage +
(m_pPreviewInfo->GetMaxPage() - m_pPreviewInfo->GetMinPage() + 9) / 10, TRUE);
break;
case SB_PAGEUP:
SetCurrentPage(m_nCurrentPage -
(m_pPreviewInfo->GetMaxPage() - m_pPreviewInfo->GetMinPage() + 9) / 10, TRUE);
break;
case SB_LINEDOWN:
SetCurrentPage(m_nCurrentPage + 1, TRUE);
break;
case SB_LINEUP:
SetCurrentPage(m_nCurrentPage - 1, TRUE);
break;
case SB_THUMBPOSITION:
SetCurrentPage(nPos, TRUE);
break;
}
}
void CPreviewView::OnNumPageChange()
{
ASSERT(m_nPages == 1 || m_nPages == 2);
m_nPages = 3 - m_nPages; // Toggle between 1 and 2
AfxGetApp()->m_nNumPreviewPages = m_nPages;
m_nZoomOutPages = m_nPages;
// Just do this to set the status correctly and invalidate
SetCurrentPage(m_nCurrentPage, TRUE);
}
void CPreviewView::OnNextPage()
{
SetCurrentPage(m_nCurrentPage + 1, TRUE);
}
void CPreviewView::OnPrevPage()
{
SetCurrentPage(m_nCurrentPage - 1, TRUE);
}
void CPreviewView::OnPreviewPrint()
{
OnPreviewClose(); // force close of Preview
// cause print (can be overridden by catching the command)
CWnd* pMainWnd = AfxGetThread()->m_pMainWnd;
ASSERT_VALID(pMainWnd);
pMainWnd->SendMessage(WM_COMMAND, ID_FILE_PRINT);
}
// Finds page pointed to and convert to 1:1 screen device units
BOOL CPreviewView::FindPageRect(CPoint& point, UINT& nPage)
{
if (m_nZoomState != ZOOM_OUT)
point += (CSize)GetDeviceScrollPosition();
for (nPage = 0; nPage < m_nPages; nPage++)
{
if (m_pPageInfo[nPage].rectScreen.PtInRect(point))
{
// adjust point for page position
point -= (CSize)m_pPageInfo[nPage].rectScreen.TopLeft();
// convert to 1:1
point.x = MulDiv(point.x, m_pPageInfo[nPage].sizeScaleRatio.cy,
m_pPageInfo[nPage].sizeScaleRatio.cx);
point.y = MulDiv(point.y, m_pPageInfo[nPage].sizeScaleRatio.cy,
m_pPageInfo[nPage].sizeScaleRatio.cx);
return TRUE;
}
}
return FALSE;
}
void CPreviewView::OnLButtonDown(UINT, CPoint point)
{
UINT nPage;
if (!FindPageRect(point, nPage))
return; // Didn't click on a page
// Set new zoom state
SetZoomState((m_nZoomState == ZOOM_IN) ? ZOOM_OUT : m_nZoomState + 1,
nPage, point);
}
void CPreviewView::SetZoomState(UINT nNewState, UINT nPage, CPoint point)
{
if (m_nZoomState != nNewState)
{
m_nZoomState = nNewState;
DoZoom(nPage, point);
}
}
void CPreviewView::OnZoomIn()
{
if (m_nZoomState != ZOOM_IN)
SetZoomState(m_nZoomState + 1, 0, CPoint(0, 0));
}
void CPreviewView::OnZoomOut()
{
if (m_nZoomState != ZOOM_OUT)
SetZoomState(m_nZoomState - 1, 0, CPoint(0, 0));
}
// Actual zoom code.
void CPreviewView::DoZoom(UINT nPage, CPoint point)
{
if (m_nZoomState == ZOOM_OUT)
{
// taking over scroll bars
m_nPages = m_nZoomOutPages;
ShowScrollBar(SB_HORZ, FALSE); //hide the horizontal bar
BOOL bShowBar = m_pPreviewInfo->GetMaxPage() < 0x8000 &&
m_pPreviewInfo->GetMaxPage() -
m_pPreviewInfo->GetMinPage() <= 32767U;
ShowScrollBar(SB_VERT, bShowBar); //Show the vertical bar
if (bShowBar)
{
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);
}
SetCurrentPage(m_nCurrentPage, TRUE);
}
else
{
m_nPages = 1; // only one page in zoomed states
m_pPageInfo[0].sizeZoomOutRatio = m_pPageInfo[nPage].sizeZoomOutRatio;
m_pPageInfo[0].sizeUnscaled = m_pPageInfo[nPage].sizeUnscaled;
// Sets the printer page
SetCurrentPage(m_nCurrentPage + nPage, FALSE);
SetScaledSize(0);
CSize* pRatio = &m_pPageInfo[nPage].sizeScaleRatio;
// convert Hit Point from screen 1:1
point.x = MulDiv(point.x, pRatio->cx, pRatio->cy);
point.y = MulDiv(point.y, pRatio->cx, pRatio->cy);
// Adjust point for page position
point += (CSize)m_pPageInfo[0].rectScreen.TopLeft();
// Scroll to center
CenterOnPoint(point);
}
}
void CPreviewView::SetCurrentPage(UINT nPage, BOOL bClearRatios)
{
m_nCurrentPage = nPage;
if (m_nCurrentPage > m_pPreviewInfo->GetMaxPage())
m_nCurrentPage = m_pPreviewInfo->GetMaxPage();
if (m_nCurrentPage < m_pPreviewInfo->GetMinPage())
m_nCurrentPage = m_pPreviewInfo->GetMinPage();
if (m_nZoomState == ZOOM_OUT)
SetScrollPos(SB_VERT, m_nCurrentPage);
if (bClearRatios)
{
// Force Recalc of layout
for (UINT i = 0; i < m_nMaxPages; i++)
m_pPageInfo[i].sizeScaleRatio.cx = 0; // zero scale ratios
}
Invalidate(TRUE);
}
void CPreviewView::OnDisplayPageNumber(UINT nPage, UINT nPagesDisplayed)
{
UINT nEndPage = nPage + nPagesDisplayed - 1;
CFrameWnd* pParent = (CFrameWnd*)AfxGetThread()->m_pMainWnd;
ASSERT_VALID(pParent);
ASSERT_KINDOF(CFrameWnd, pParent);
int nSubString = (nPagesDisplayed == 1) ? 0 : 1;
CString s;
if (AfxExtractSubString(s, m_pPreviewInfo->m_strPageDesc, nSubString))
{
TCHAR szBuf[80];
if (nSubString == 0)
wsprintf(szBuf, s, nPage);
else
wsprintf(szBuf, s, nPage, nEndPage);
pParent->SendMessage(WM_SETMESSAGESTRING, 0, (LPARAM)(LPVOID)szBuf);
}
else
{
TRACE1("Malformed Page Description string. Could not get string %d.\n",
nSubString);
}
}
void CPreviewView::OnUpdateNumPageChange(CCmdUI* pCmdUI)
{
// set text of button to opposite of current state
CString text;
UINT nPages = m_nZoomState == ZOOM_OUT ? m_nPages : m_nZoomOutPages;
VERIFY(text.LoadString(nPages == 1 ? AFX_IDS_TWOPAGE : AFX_IDS_ONEPAGE));
pCmdUI->SetText(text);
// 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));
}
void CPreviewView::OnUpdateNextPage(CCmdUI* pCmdUI)
{
// enable if not showing last page
pCmdUI->Enable(m_nCurrentPage+m_nPages-1 < m_pPreviewInfo->GetMaxPage());
}
void CPreviewView::OnUpdatePrevPage(CCmdUI* pCmdUI)
{
// enable if not showing First page
pCmdUI->Enable(m_nCurrentPage > m_pPreviewInfo->GetMinPage());
}
void CPreviewView::OnUpdateZoomIn(CCmdUI* pCmdUI)
{
pCmdUI->Enable(m_nZoomState != ZOOM_IN);
}
void CPreviewView::OnUpdateZoomOut(CCmdUI* pCmdUI)
{
pCmdUI->Enable(m_nZoomState != ZOOM_OUT);
}
BOOL CPreviewView::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message)
{
if (nHitTest != HTCLIENT)
return CScrollView::OnSetCursor(pWnd, nHitTest, message);
CPoint point;
::GetCursorPos(&point);
ScreenToClient(&point); // client coordinates of mouse position
UINT nPage;
if (m_nZoomState != ZOOM_IN && FindPageRect(point, nPage))
{ // On a page and not zoomed all the way in
if (m_hMagnifyCursor == NULL)
{
HINSTANCE hInst = AfxFindResourceHandle(
MAKEINTRESOURCE(AFX_IDC_MAGNIFY), RT_GROUP_CURSOR);
m_hMagnifyCursor = ::LoadCursor(hInst,
MAKEINTRESOURCE(AFX_IDC_MAGNIFY));
}
::SetCursor(m_hMagnifyCursor);
}
else
{
::SetCursor(::LoadCursor(NULL, IDC_ARROW));
}
return 0;
}
/////////////////////////////////////////////////////////////////////////////
// CPreviewView diagnostics
#ifdef _DEBUG
void CPreviewView::AssertValid() const
{
CView::AssertValid();
ASSERT_VALID(&m_dcPrint);
if (m_pPreviewDC != NULL)
ASSERT_VALID(m_pPreviewDC);
switch (m_nZoomState)
{
case ZOOM_OUT:
case ZOOM_IN:
case ZOOM_MIDDLE:
break;
default:
ASSERT(FALSE); // unknown zoom state
}
switch (m_nMapMode)
{
case MM_TEXT:
case MM_LOMETRIC:
case MM_HIMETRIC:
case MM_LOENGLISH:
case MM_HIENGLISH:
case MM_TWIPS:
case MM_ISOTROPIC:
case MM_ANISOTROPIC:
break;
default:
ASSERT(FALSE); // unknown mapping mode
}
}
void CPreviewView::Dump(CDumpContext& dc) const
{
CView::Dump(dc);
dc << "m_pPrintView = " << m_pPrintView;
dc << "\nm_pOrigView = " << m_pOrigView;
dc << "\nm_bPageNumDisplayed = " << m_bPageNumDisplayed;
dc << "\nm_bCenter = " << m_bCenter;
dc << "\nm_nPages = " << m_nPages;
dc << "\nm_nCurrentPage " << m_nCurrentPage;
dc << "\nm_nSecondPageOffset " << m_nSecondPageOffset;
dc << "\nm_nMaxPages = " << m_nMaxPages;
dc << "\nm_sizePrinterPPI = " << m_sizePrinterPPI;
dc << "\nm_ptCenterPoint = " << m_ptCenterPoint;
dc << "\nm_nZoomState = ";
switch (m_nZoomState)
{
case ZOOM_OUT:
dc << "ZOOM_OUT";
break;
case ZOOM_IN:
dc << "ZOOM_IN";
break;
case ZOOM_MIDDLE:
dc << "ZOOM_MIDDLE";
break;
default:
dc << "*unknown*";
break;
}
dc << "\nm_nMapMode = ";
switch (m_nMapMode)
{
case MM_TEXT:
dc << "MM_TEXT";
break;
case MM_LOMETRIC:
dc << "MM_LOMETRIC";
break;
case MM_HIMETRIC:
dc << "MM_HIMETRIC";
break;
case MM_LOENGLISH:
dc << "MM_LOENGLISH";
break;
case MM_HIENGLISH:
dc << "MM_HIENGLISH";
break;
case MM_TWIPS:
dc << "MM_TWIPS";
break;
case MM_ISOTROPIC:
dc << "MM_ISOTROPIC";
break;
case MM_ANISOTROPIC:
dc << "MM_ANISOTROPIC";
break;
default:
dc << "*unknown*";
break;
}
dc << "\nm_dcPrint = " << &m_dcPrint;
dc << "\nm_pPreviewDC = " << m_pPreviewDC;
dc << "\n";
}
#endif //_DEBUG
#ifdef AFX_INIT_SEG
#pragma code_seg(AFX_INIT_SEG)
#endif
IMPLEMENT_DYNCREATE(CPreviewView, CScrollView)
/////////////////////////////////////////////////////////////////////////////