src/common/prntbase.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        prntbase.cpp
   3 // Purpose:     Printing framework base class implementation
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart and Markus Holzem
   9 // Licence:       wxWindows license
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifdef __GNUG__
  13 #pragma implementation "prntbase.h"
  14 #endif
  15
  16 // For compilers that support precompilation, includes "wx.h".
  17 #include "wx/wxprec.h"
  18
  19 #ifdef __BORLANDC__
  20 #pragma hdrstop
  21 #endif
  22
  23 #include "wx/defs.h"
  24
  25 #if wxUSE_PRINTING_ARCHITECTURE
  26
  27 #ifndef WX_PRECOMP
  28 #include "wx/utils.h"
  29 #include "wx/dc.h"
  30 #include "wx/app.h"
  31 #include "wx/msgdlg.h"
  32 #include "wx/layout.h"
  33 #include "wx/choice.h"
  34 #include "wx/button.h"
  35 #include "wx/settings.h"
  36 #include "wx/dcmemory.h"
  37 #include "wx/stattext.h"
  38 #include "wx/intl.h"
  39 #endif
  40
  41 #include "wx/prntbase.h"
  42 #include "wx/dcprint.h"
  43 #include "wx/printdlg.h"
  44 #include "wx/module.h"
  45
  46 #include <stdlib.h>
  47 #include <string.h>
  48
  49 #ifdef __WXMSW__
  50     #include "wx/msw/private.h"
  51     #include <commdlg.h>
  52
  53     #ifndef __WIN32__
  54         #include <print.h>
  55     #endif
  56 #endif // __WXMSW__
  57
  58 IMPLEMENT_CLASS(wxPrinterBase, wxObject)
  59 IMPLEMENT_ABSTRACT_CLASS(wxPrintout, wxObject)
  60 IMPLEMENT_CLASS(wxPreviewCanvas, wxWindow)
  61 IMPLEMENT_CLASS(wxPreviewControlBar, wxWindow)
  62 IMPLEMENT_CLASS(wxPreviewFrame, wxFrame)
  63 IMPLEMENT_CLASS(wxPrintPreviewBase, wxObject)
  64
  65 BEGIN_EVENT_TABLE(wxPrintAbortDialog, wxDialog)
  66     EVT_BUTTON(wxID_CANCEL, wxPrintAbortDialog::OnCancel)
  67 END_EVENT_TABLE()
  68
  69 BEGIN_EVENT_TABLE(wxPreviewCanvas, wxScrolledWindow)
  70     EVT_PAINT(wxPreviewCanvas::OnPaint)
  71     EVT_SYS_COLOUR_CHANGED(wxPreviewCanvas::OnSysColourChanged)
  72 END_EVENT_TABLE()
  73
  74 /*
  75 * Printer
  76 */
  77
  78 wxPrinterBase::wxPrinterBase(wxPrintDialogData *data)
  79 {
  80     m_currentPrintout = (wxPrintout *) NULL;
  81     sm_abortWindow = (wxWindow *) NULL;
  82     sm_abortIt = FALSE;
  83     if (data)
  84         m_printDialogData = (*data);
  85 }
  86
  87 wxWindow *wxPrinterBase::sm_abortWindow = (wxWindow *) NULL;
  88 bool wxPrinterBase::sm_abortIt = FALSE;
  89
  90 wxPrinterBase::~wxPrinterBase()
  91 {
  92 }
  93
  94 void wxPrintAbortDialog::OnCancel(wxCommandEvent& WXUNUSED(event))
  95 {
  96     wxPrinterBase::sm_abortIt = TRUE;
  97     wxPrinterBase::sm_abortWindow->Show(FALSE);
  98     wxPrinterBase::sm_abortWindow->Close(TRUE);
  99     wxPrinterBase::sm_abortWindow = (wxWindow *) NULL;
 100 }
 101
 102 wxWindow *wxPrinterBase::CreateAbortWindow(wxWindow *parent, wxPrintout *WXUNUSED(printout))
 103 {
 104     wxPrintAbortDialog *dialog = new wxPrintAbortDialog(parent, _("Printing"), wxPoint(0, 0), wxSize(400, 400), wxDEFAULT_DIALOG_STYLE);
 105     (void) new wxStaticText(dialog, -1, _("Please wait..."), wxPoint(5, 5));
 106
 107     wxButton *button = new wxButton(dialog, wxID_CANCEL, _("Cancel"), wxPoint(5, 30));
 108
 109     dialog->Fit();
 110     button->Centre(wxHORIZONTAL);
 111
 112     dialog->Centre();
 113     return dialog;
 114 }
 115
 116 void wxPrinterBase::ReportError(wxWindow *parent, wxPrintout *WXUNUSED(printout), char *message)
 117 {
 118     wxMessageBox(message, _("Printing Error"), wxOK, parent);
 119 }
 120
 121 /*
 122 * Printout class
 123 */
 124
 125 wxPrintout::wxPrintout(const wxString& title)
 126 {
 127     m_printoutTitle = title ;
 128     m_printoutDC = (wxDC *) NULL;
 129     m_pageWidthMM = 0;
 130     m_pageHeightMM = 0;
 131     m_pageWidthPixels = 0;
 132     m_pageHeightPixels = 0;
 133     m_PPIScreenX = 0;
 134     m_PPIScreenY = 0;
 135     m_PPIPrinterX = 0;
 136     m_PPIPrinterY = 0;
 137     m_isPreview = FALSE;
 138 }
 139
 140 wxPrintout::~wxPrintout()
 141 {
 142 }
 143
 144 bool wxPrintout::OnBeginDocument(int WXUNUSED(startPage), int WXUNUSED(endPage))
 145 {
 146     return GetDC()->StartDoc(_("Printing"));
 147 }
 148
 149 void wxPrintout::OnEndDocument()
 150 {
 151     GetDC()->EndDoc();
 152 }
 153
 154 void wxPrintout::OnBeginPrinting()
 155 {
 156 }
 157
 158 void wxPrintout::OnEndPrinting()
 159 {
 160 }
 161
 162 bool wxPrintout::HasPage(int page)
 163 {
 164     return (page == 1);
 165 }
 166
 167 void wxPrintout::GetPageInfo(int *minPage, int *maxPage, int *fromPage, int *toPage)
 168 {
 169     *minPage = 1;
 170     *maxPage = 32000;
 171     *fromPage = 1;
 172     *toPage = 1;
 173 }
 174
 175 /*
 176 * Preview canvas
 177 */
 178
 179 wxPreviewCanvas::wxPreviewCanvas(wxPrintPreviewBase *preview, wxWindow *parent,
 180                                  const wxPoint& pos, const wxSize& size, long style, const wxString& name):
 181 wxScrolledWindow(parent, -1, pos, size, style, name)
 182 {
 183     m_printPreview = preview;
 184     SetBackgroundColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_APPWORKSPACE));
 185
 186     SetScrollbars(15, 18, 100, 100);
 187 }
 188
 189 wxPreviewCanvas::~wxPreviewCanvas()
 190 {
 191 }
 192
 193 void wxPreviewCanvas::OnPaint(wxPaintEvent& WXUNUSED(event))
 194 {
 195     wxPaintDC dc(this);
 196     PrepareDC( dc );
 197
 198 /*
 199 #ifdef __WXGTK__
 200     if (!GetUpdateRegion().IsEmpty())
 201         dc.SetClippingRegion( GetUpdateRegion() );
 202 #endif
 203 */
 204
 205     if (m_printPreview)
 206     {
 207         m_printPreview->PaintPage(this, dc);
 208     }
 209 }
 210
 211 // Responds to colour changes, and passes event on to children.
 212 void wxPreviewCanvas::OnSysColourChanged(wxSysColourChangedEvent& event)
 213 {
 214     SetBackgroundColour(wxSystemSettings::GetSystemColour(wxSYS_COLOUR_APPWORKSPACE));
 215     Refresh();
 216
 217     // Propagate the event to the non-top-level children
 218     wxWindow::OnSysColourChanged(event);
 219 }
 220
 221 /*
 222 * Preview control bar
 223 */
 224
 225 BEGIN_EVENT_TABLE(wxPreviewControlBar, wxPanel)
 226     EVT_BUTTON(wxID_PREVIEW_CLOSE,    wxPreviewControlBar::OnWindowClose)
 227     EVT_BUTTON(wxID_PREVIEW_PRINT,    wxPreviewControlBar::OnPrint)
 228     EVT_BUTTON(wxID_PREVIEW_PREVIOUS, wxPreviewControlBar::OnPreviousButton)
 229     EVT_BUTTON(wxID_PREVIEW_NEXT,     wxPreviewControlBar::OnNextButton)
 230     EVT_CHAR(wxPreviewControlBar::OnChar)
 231     EVT_CHOICE(wxID_PREVIEW_ZOOM,     wxPreviewControlBar::OnZoom)
 232     EVT_PAINT(wxPreviewControlBar::OnPaint)
 233 END_EVENT_TABLE()
 234
 235 wxPreviewControlBar::wxPreviewControlBar(wxPrintPreviewBase *preview, long buttons,
 236                                          wxWindow *parent, const wxPoint& pos, const wxSize& size,
 237                                          long style, const wxString& name):
 238 wxPanel(parent, -1, pos, size, style, name)
 239 {
 240     m_printPreview = preview;
 241     m_closeButton = (wxButton *) NULL;
 242     m_nextPageButton = (wxButton *) NULL;
 243     m_previousPageButton = (wxButton *) NULL;
 244     m_printButton = (wxButton *) NULL;
 245     m_zoomControl = (wxChoice *) NULL;
 246     m_buttonFlags = buttons;
 247 }
 248
 249 wxPreviewControlBar::~wxPreviewControlBar()
 250 {
 251 }
 252
 253 void wxPreviewControlBar::OnPaint(wxPaintEvent& WXUNUSED(event))
 254 {
 255     wxPaintDC dc(this);
 256
 257     int w, h;
 258     GetSize(&w, &h);
 259     dc.SetPen(*wxBLACK_PEN);
 260     dc.SetBrush(*wxTRANSPARENT_BRUSH);
 261     dc.DrawLine( 0, h-1, w, h-1 );
 262 }
 263
 264 void wxPreviewControlBar::OnWindowClose(wxCommandEvent& WXUNUSED(event))
 265 {
 266     wxPreviewFrame *frame = (wxPreviewFrame *)GetParent();
 267     frame->Close(TRUE);
 268 }
 269
 270 void wxPreviewControlBar::OnPrint(wxCommandEvent& WXUNUSED(event))
 271 {
 272     wxPrintPreviewBase *preview = GetPrintPreview();
 273     preview->Print(TRUE);
 274 }
 275
 276 void wxPreviewControlBar::OnChar(wxKeyEvent &event)
 277 {
 278    switch(event.KeyCode())
 279    {
 280    case WXK_NEXT:
 281       OnNext(); break;
 282    case WXK_PRIOR:
 283       OnPrevious(); break;
 284    default:
 285       event.Skip();
 286    }
 287 }
 288
 289 void wxPreviewControlBar::OnNext(void)
 290 {
 291     wxPrintPreviewBase *preview = GetPrintPreview();
 292     if (preview)
 293     {
 294         int currentPage = preview->GetCurrentPage();
 295         if ((preview->GetMaxPage() > 0) &&
 296             (currentPage < preview->GetMaxPage()) &&
 297             preview->GetPrintout()->HasPage(currentPage + 1))
 298         {
 299             preview->SetCurrentPage(currentPage + 1);
 300         }
 301     }
 302 }
 303
 304 void wxPreviewControlBar::OnPrevious(void)
 305 {
 306     wxPrintPreviewBase *preview = GetPrintPreview();
 307     if (preview)
 308     {
 309         int currentPage = preview->GetCurrentPage();
 310         if ((preview->GetMinPage() > 0) &&
 311             (currentPage > preview->GetMinPage()) &&
 312             preview->GetPrintout()->HasPage(currentPage - 1))
 313         {
 314             preview->SetCurrentPage(currentPage - 1);
 315         }
 316     }
 317 }
 318
 319 void wxPreviewControlBar::OnZoom(wxCommandEvent& WXUNUSED(event))
 320 {
 321     int zoom = GetZoomControl();
 322     if (GetPrintPreview())
 323         GetPrintPreview()->SetZoom(zoom);
 324 }
 325
 326 void wxPreviewControlBar::CreateButtons()
 327 {
 328     SetSize(0, 0, 400, 40);
 329
 330     /*
 331     #ifdef __WXMSW__
 332     int fontSize = 9;
 333     #else
 334     int fontSize = 10;
 335     #endif
 336
 337       wxFont buttonFont(fontSize, wxSWISS, wxNORMAL, wxBOLD);
 338       SetFont(buttonFont);
 339     */
 340
 341     int buttonWidth = 65;
 342 #ifdef __WXGTK__
 343     int buttonHeight = -1;
 344 #else
 345     int buttonHeight = 24;
 346 #endif
 347
 348     int x = 5;
 349     int y = 5;
 350
 351 #ifdef __WXMOTIF__
 352     int gap = 15;
 353 #else
 354     int gap = 5;
 355 #endif
 356
 357     m_closeButton = new wxButton(this, wxID_PREVIEW_CLOSE, _("Close"),
 358         wxPoint(x, y), wxSize(buttonWidth, buttonHeight));
 359
 360     x += gap + buttonWidth;
 361
 362     if (m_buttonFlags & wxPREVIEW_PRINT)
 363     {
 364         m_printButton =  new wxButton(this, wxID_PREVIEW_PRINT, _("Print..."), wxPoint(x, y),
 365             wxSize(buttonWidth, buttonHeight));
 366         x += gap + buttonWidth;
 367     }
 368
 369     if (m_buttonFlags & wxPREVIEW_PREVIOUS)
 370     {
 371         m_previousPageButton = new wxButton(this, wxID_PREVIEW_PREVIOUS, wxT("<<"), wxPoint(x, y),
 372             wxSize(buttonWidth, buttonHeight));
 373         x += gap + buttonWidth;
 374     }
 375
 376     if (m_buttonFlags & wxPREVIEW_NEXT)
 377     {
 378         m_nextPageButton = new wxButton(this, wxID_PREVIEW_NEXT, wxT(">>"),
 379             wxPoint(x, y), wxSize(buttonWidth, buttonHeight));
 380         x += gap + buttonWidth;
 381     }
 382
 383     if (m_buttonFlags & wxPREVIEW_ZOOM)
 384     {
 385         static const char *choices[] =
 386         {
 387             "10%", "15%", "20%", "25%", "30%", "35%", "40%", "45%", "50%", "55%",
 388             "60%", "65%", "70%", "75%", "80%", "85%", "90%", "95%", "100%", "110%",
 389             "120%", "150%", "200%"
 390         };
 391
 392         int n = WXSIZEOF(choices);
 393
 394         wxString* strings = new wxString[n];
 395         int i;
 396         for (i = 0; i < n; i++ )
 397            strings[i] = choices[i];
 398
 399         m_zoomControl = new wxChoice(this, wxID_PREVIEW_ZOOM,
 400                                      wxPoint(x, y),
 401                                      wxSize(100, -1),
 402                                      n,
 403                                      strings
 404                                     );
 405         delete[] strings;
 406
 407         SetZoomControl(m_printPreview->GetZoom());
 408     }
 409
 410     //  m_closeButton->SetDefault();
 411 }
 412
 413 void wxPreviewControlBar::SetZoomControl(int zoom)
 414 {
 415     char buf[20];
 416     sprintf(buf, "%d%%", zoom);
 417 // Someone is calling methods that do no exist in wxChoice!! So I'll just comment out for VA for now
 418     if (m_zoomControl)
 419         m_zoomControl->SetStringSelection(buf);
 420 }
 421
 422 int wxPreviewControlBar::GetZoomControl()
 423 {
 424     wxChar buf[20];
 425     if (m_zoomControl && (m_zoomControl->GetStringSelection() != wxT("")))
 426     {
 427         wxStrcpy(buf, m_zoomControl->GetStringSelection());
 428         buf[wxStrlen(buf) - 1] = 0;
 429         return (int)wxAtoi(buf);
 430     }
 431     else return 0;
 432 }
 433
 434
 435 /*
 436 * Preview frame
 437 */
 438
 439 BEGIN_EVENT_TABLE(wxPreviewFrame, wxFrame)
 440     EVT_CLOSE(wxPreviewFrame::OnCloseWindow)
 441 END_EVENT_TABLE()
 442
 443 wxPreviewFrame::wxPreviewFrame(wxPrintPreviewBase *preview, wxFrame *parent, const wxString& title,
 444                                const wxPoint& pos, const wxSize& size, long style, const wxString& name):
 445 wxFrame(parent, -1, title, pos, size, style, name)
 446 {
 447     m_printPreview = preview;
 448     m_controlBar = NULL;
 449     m_previewCanvas = NULL;
 450 }
 451
 452 wxPreviewFrame::~wxPreviewFrame()
 453 {
 454 }
 455
 456 void wxPreviewFrame::OnCloseWindow(wxCloseEvent& WXUNUSED(event))
 457 {
 458     MakeModal(FALSE);
 459
 460     // Need to delete the printout and the print preview
 461     wxPrintout *printout = m_printPreview->GetPrintout();
 462     if (printout)
 463     {
 464         delete printout;
 465         m_printPreview->SetPrintout(NULL);
 466         m_printPreview->SetCanvas(NULL);
 467         m_printPreview->SetFrame(NULL);
 468     }
 469     delete m_printPreview;
 470
 471     Destroy();
 472 }
 473
 474 void wxPreviewFrame::Initialize()
 475 {
 476     CreateStatusBar();
 477
 478     CreateCanvas();
 479     CreateControlBar();
 480
 481     m_printPreview->SetCanvas(m_previewCanvas);
 482     m_printPreview->SetFrame(this);
 483
 484     // Set layout constraints here
 485
 486     // Control bar constraints
 487     wxLayoutConstraints *c1 = new wxLayoutConstraints;
 488     //  int w, h;
 489     //  m_controlBar->GetSize(&w, &h);
 490     int h;
 491 #if (defined(__WXMSW__) || defined(__WXGTK__))
 492     h = 40;
 493 #else
 494     h = 60;
 495 #endif
 496
 497     c1->left.SameAs       (this, wxLeft);
 498     c1->top.SameAs        (this, wxTop);
 499     c1->right.SameAs      (this, wxRight);
 500     c1->height.Absolute   (h);
 501
 502     m_controlBar->SetConstraints(c1);
 503
 504     // Canvas constraints
 505     wxLayoutConstraints *c2 = new wxLayoutConstraints;
 506
 507     c2->left.SameAs       (this, wxLeft);
 508     c2->top.Below         (m_controlBar);
 509     c2->right.SameAs      (this, wxRight);
 510     c2->bottom.SameAs     (this, wxBottom);
 511
 512     m_previewCanvas->SetConstraints(c2);
 513
 514     SetAutoLayout(TRUE);
 515
 516     MakeModal(TRUE);
 517
 518     Layout();
 519 }
 520
 521 void wxPreviewFrame::CreateCanvas()
 522 {
 523     m_previewCanvas = new wxPreviewCanvas(m_printPreview, this);
 524 }
 525
 526 void wxPreviewFrame::CreateControlBar()
 527 {
 528     long buttons = wxPREVIEW_DEFAULT;
 529     if (m_printPreview->GetPrintoutForPrinting())
 530         buttons |= wxPREVIEW_PRINT;
 531
 532     m_controlBar = new wxPreviewControlBar(m_printPreview, buttons, this, wxPoint(0, 0), wxSize(400, 40));
 533     m_controlBar->CreateButtons();
 534 }
 535
 536 /*
 537 * Print preview
 538 */
 539
 540 wxPrintPreviewBase::wxPrintPreviewBase(wxPrintout *printout,
 541                                        wxPrintout *printoutForPrinting,
 542                                        wxPrintData *data)
 543 {
 544     if (data)
 545         m_printDialogData = (*data);
 546
 547     Init(printout, printoutForPrinting);
 548 }
 549
 550 wxPrintPreviewBase::wxPrintPreviewBase(wxPrintout *printout,
 551                                        wxPrintout *printoutForPrinting,
 552                                        wxPrintDialogData *data)
 553 {
 554     if (data)
 555         m_printDialogData = (*data);
 556
 557     Init(printout, printoutForPrinting);
 558 }
 559
 560 void wxPrintPreviewBase::Init(wxPrintout *printout,
 561                               wxPrintout *printoutForPrinting)
 562 {
 563     m_isOk = TRUE;
 564     m_previewPrintout = printout;
 565     if (m_previewPrintout)
 566         m_previewPrintout->SetIsPreview(TRUE);
 567
 568     m_printPrintout = printoutForPrinting;
 569
 570     m_previewCanvas = NULL;
 571     m_previewFrame = NULL;
 572     m_previewBitmap = NULL;
 573     m_currentPage = 1;
 574     m_currentZoom = 70;
 575     m_topMargin = 40;
 576     m_leftMargin = 40;
 577     m_pageWidth = 0;
 578     m_pageHeight = 0;
 579     m_printingPrepared = FALSE;
 580
 581     // Too soon! Moved to RenderPage.
 582     // printout->OnPreparePrinting();
 583
 584     // Get some parameters from the printout, if defined
 585     int selFrom, selTo;
 586     printout->GetPageInfo(&m_minPage, &m_maxPage, &selFrom, &selTo);
 587 }
 588
 589 wxPrintPreviewBase::~wxPrintPreviewBase()
 590 {
 591     if (m_previewPrintout)
 592         delete m_previewPrintout;
 593     if (m_previewBitmap)
 594         delete m_previewBitmap;
 595     if (m_printPrintout)
 596         delete m_printPrintout;
 597 }
 598
 599 bool wxPrintPreviewBase::SetCurrentPage(int pageNum)
 600 {
 601     if (m_currentPage == pageNum)
 602         return TRUE;
 603
 604     m_currentPage = pageNum;
 605     if (m_previewBitmap)
 606     {
 607         delete m_previewBitmap;
 608         m_previewBitmap = NULL;
 609     }
 610
 611     if (m_previewCanvas)
 612     {
 613         RenderPage(pageNum);
 614         m_previewCanvas->Refresh();
 615     }
 616     return TRUE;
 617 }
 618
 619 bool wxPrintPreviewBase::PaintPage(wxWindow *canvas, wxDC& dc)
 620 {
 621     DrawBlankPage(canvas, dc);
 622
 623     if (!m_previewBitmap)
 624         RenderPage(m_currentPage);
 625
 626     if (!m_previewBitmap)
 627         return FALSE;
 628
 629     if (!canvas)
 630         return FALSE;
 631
 632     int canvasWidth, canvasHeight;
 633     canvas->GetSize(&canvasWidth, &canvasHeight);
 634
 635     double zoomScale = ((float)m_currentZoom/(float)100);
 636     double actualWidth = (zoomScale*m_pageWidth*m_previewScale);
 637     //  float actualHeight = (float)(zoomScale*m_pageHeight*m_previewScale);
 638
 639     int x = (int) ((canvasWidth - actualWidth)/2.0);
 640     if (x < m_leftMargin)
 641         x = m_leftMargin;
 642     int y = m_topMargin;
 643
 644     wxMemoryDC temp_dc;
 645     temp_dc.SelectObject(*m_previewBitmap);
 646
 647     dc.Blit(x, y, m_previewBitmap->GetWidth(), m_previewBitmap->GetHeight(), &temp_dc, 0, 0);
 648
 649     temp_dc.SelectObject(wxNullBitmap);
 650
 651     return TRUE;
 652 }
 653
 654 bool wxPrintPreviewBase::RenderPage(int pageNum)
 655 {
 656     int canvasWidth, canvasHeight;
 657
 658     if (!m_previewCanvas)
 659     {
 660         wxMessageBox(_("wxPrintPreviewBase::RenderPage: must use wxPrintPreviewBase::SetCanvas to let me know about the canvas!"),
 661             _("Print Preview Failure"), wxOK);
 662         return FALSE;
 663     }
 664     m_previewCanvas->GetSize(&canvasWidth, &canvasHeight);
 665
 666     double zoomScale = (m_currentZoom/100.0);
 667     int actualWidth = (int)(zoomScale*m_pageWidth*m_previewScale);
 668     int actualHeight = (int)(zoomScale*m_pageHeight*m_previewScale);
 669
 670     int x = (int)((canvasWidth - actualWidth)/2.0);
 671     if (x < m_leftMargin)
 672         x = m_leftMargin;
 673     //  int y = m_topMargin;
 674
 675
 676     if (!m_previewBitmap)
 677     {
 678         m_previewBitmap = new wxBitmap((int)actualWidth, (int)actualHeight);
 679         if (!m_previewBitmap || !m_previewBitmap->Ok())
 680         {
 681             if (m_previewBitmap)
 682                 delete m_previewBitmap;
 683             wxMessageBox(_("Sorry, not enough memory to create a preview."), _("Print Preview Failure"), wxOK);
 684             return FALSE;
 685         }
 686     }
 687
 688     wxMemoryDC memoryDC;
 689     memoryDC.SelectObject(*m_previewBitmap);
 690
 691     memoryDC.Clear();
 692
 693     m_previewPrintout->SetDC(&memoryDC);
 694     m_previewPrintout->SetPageSizePixels(m_pageWidth, m_pageHeight);
 695
 696     // Need to delay OnPreparePrinting until here, so we have enough information.
 697     if (!m_printingPrepared)
 698     {
 699         m_previewPrintout->OnPreparePrinting();
 700         m_printingPrepared = TRUE;
 701     }
 702
 703     m_previewPrintout->OnBeginPrinting();
 704
 705     if (!m_previewPrintout->OnBeginDocument(m_printDialogData.GetFromPage(), m_printDialogData.GetToPage()))
 706     {
 707         wxMessageBox(_("Could not start document preview."), _("Print Preview Failure"), wxOK);
 708
 709         memoryDC.SelectObject(wxNullBitmap);
 710
 711         delete m_previewBitmap;
 712         return FALSE;
 713     }
 714
 715     m_previewPrintout->OnPrintPage(pageNum);
 716     m_previewPrintout->OnEndDocument();
 717     m_previewPrintout->OnEndPrinting();
 718
 719     m_previewPrintout->SetDC(NULL);
 720
 721     memoryDC.SelectObject(wxNullBitmap);
 722
 723     wxChar buf[200];
 724     if (m_maxPage != 0)
 725         wxSprintf(buf, _("Page %d of %d"), pageNum, m_maxPage);
 726     else
 727         wxSprintf(buf, _("Page %d"), pageNum);
 728
 729     if (m_previewFrame)
 730         m_previewFrame->SetStatusText(buf);
 731
 732     return TRUE;
 733 }
 734
 735
 736 bool wxPrintPreviewBase::DrawBlankPage(wxWindow *canvas, wxDC& dc)
 737 {
 738     int canvasWidth, canvasHeight;
 739     canvas->GetSize(&canvasWidth, &canvasHeight);
 740
 741     float zoomScale = (float)((float)m_currentZoom/(float)100);
 742     float actualWidth = zoomScale*m_pageWidth*m_previewScale;
 743     float actualHeight = zoomScale*m_pageHeight*m_previewScale;
 744
 745     float x = (float)((canvasWidth - actualWidth)/2.0);
 746     if (x < m_leftMargin)
 747         x = (float)m_leftMargin;
 748     float y = (float)m_topMargin;
 749
 750     // Draw shadow, allowing for 1-pixel border AROUND the actual page
 751     int shadowOffset = 4;
 752     dc.SetPen(*wxBLACK_PEN);
 753     dc.SetBrush(*wxBLACK_BRUSH);
 754     /*
 755     dc.DrawRectangle((int)(x-1 + shadowOffset), (int)(y-1 + shadowOffset), (int)(actualWidth+2), (int)(actualHeight+2));
 756     */
 757     dc.DrawRectangle((int)(x + shadowOffset), (int)(y + actualHeight+1), (int)(actualWidth), shadowOffset);
 758     dc.DrawRectangle((int)(x + actualWidth), (int)(y + shadowOffset), shadowOffset, (int)(actualHeight));
 759
 760     // Draw blank page allowing for 1-pixel border AROUND the actual page
 761     dc.SetPen(*wxBLACK_PEN);
 762     dc.SetBrush(*wxWHITE_BRUSH);
 763
 764     /*
 765     wxRegion update_region = canvas->GetUpdateRegion();
 766     wxRect r = update_region.GetBox();
 767
 768       printf( "x: %d y: %d w: %d h: %d.\n", (int)r.x, (int)r.y, (int)r.width, (int)r.height );
 769     */
 770
 771     dc.DrawRectangle((int)(x-2), (int)(y-1), (int)(actualWidth+3), (int)(actualHeight+2));
 772
 773     return TRUE;
 774 }
 775
 776 void wxPrintPreviewBase::SetZoom(int percent)
 777 {
 778     if (m_currentZoom == percent)
 779         return;
 780
 781     m_currentZoom = percent;
 782     if (m_previewBitmap)
 783     {
 784         delete m_previewBitmap;
 785         m_previewBitmap = NULL;
 786     }
 787
 788     if (m_previewCanvas)
 789     {
 790         RenderPage(m_currentPage);
 791         ((wxScrolledWindow *) m_previewCanvas)->Scroll(0, 0);
 792         m_previewCanvas->Clear();
 793         m_previewCanvas->Refresh();
 794     }
 795 }
 796
 797 #endif // wxUSE_PRINTING_ARCHITECTURE