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     sm_lastError = wxPRINTER_NO_ERROR;
  86 }
  87
  88 wxWindow *wxPrinterBase::sm_abortWindow = (wxWindow *) NULL;
  89 bool wxPrinterBase::sm_abortIt = FALSE;
  90 wxPrinterError wxPrinterBase::sm_lastError = wxPRINTER_NO_ERROR;
  91
  92 wxPrinterBase::~wxPrinterBase()
  93 {
  94 }
  95
  96 void wxPrintAbortDialog::OnCancel(wxCommandEvent& WXUNUSED(event))
  97 {
  98     wxPrinterBase::sm_abortIt = TRUE;
  99     wxPrinterBase::sm_abortWindow->Show(FALSE);
 100     wxPrinterBase::sm_abortWindow->Close(TRUE);
 101     wxPrinterBase::sm_abortWindow = (wxWindow *) NULL;
 102 }
 103
 104 wxWindow *wxPrinterBase::CreateAbortWindow(wxWindow *parent, wxPrintout *WXUNUSED(printout))
 105 {
 106     wxPrintAbortDialog *dialog = new wxPrintAbortDialog(parent, _("Printing"), wxPoint(0, 0), wxSize(400, 400), wxDEFAULT_DIALOG_STYLE);
 107     (void) new wxStaticText(dialog, -1, _("Please wait..."), wxPoint(5, 5));
 108
 109     wxButton *button = new wxButton(dialog, wxID_CANCEL, _("Cancel"), wxPoint(5, 30));
 110
 111     dialog->Fit();
 112     button->Centre(wxHORIZONTAL);
 113
 114     dialog->Centre();
 115     return dialog;
 116 }
 117
 118 void wxPrinterBase::ReportError(wxWindow *parent, wxPrintout *WXUNUSED(printout), const wxString& message)
 119 {
 120     wxMessageBox(message, _("Printing Error"), wxOK, parent);
 121 }
 122
 123 /*
 124 * Printout class
 125 */
 126
 127 wxPrintout::wxPrintout(const wxString& title)
 128 {
 129     m_printoutTitle = title ;
 130     m_printoutDC = (wxDC *) NULL;
 131     m_pageWidthMM = 0;
 132     m_pageHeightMM = 0;
 133     m_pageWidthPixels = 0;
 134     m_pageHeightPixels = 0;
 135     m_PPIScreenX = 0;
 136     m_PPIScreenY = 0;
 137     m_PPIPrinterX = 0;
 138     m_PPIPrinterY = 0;
 139     m_isPreview = FALSE;
 140 }
 141
 142 wxPrintout::~wxPrintout()
 143 {
 144 }
 145
 146 bool wxPrintout::OnBeginDocument(int WXUNUSED(startPage), int WXUNUSED(endPage))
 147 {
 148     return GetDC()->StartDoc(_("Printing"));
 149 }
 150
 151 void wxPrintout::OnEndDocument()
 152 {
 153     GetDC()->EndDoc();
 154 }
 155
 156 void wxPrintout::OnBeginPrinting()
 157 {
 158 }
 159
 160 void wxPrintout::OnEndPrinting()
 161 {
 162 }
 163
 164 bool wxPrintout::HasPage(int page)
 165 {
 166     return (page == 1);
 167 }
 168
 169 void wxPrintout::GetPageInfo(int *minPage, int *maxPage, int *fromPage, int *toPage)
 170 {
 171     *minPage = 1;
 172     *maxPage = 32000;
 173     *fromPage = 1;
 174     *toPage = 1;
 175 }
 176
 177 /*
 178 * Preview canvas
 179 */
 180
 181 wxPreviewCanvas::wxPreviewCanvas(wxPrintPreviewBase *preview, wxWindow *parent,
 182                                  const wxPoint& pos, const wxSize& size, long style, const wxString& name):
 183 wxScrolledWindow(parent, -1, pos, size, style, name)
 184 {
 185     m_printPreview = preview;
 186     SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_APPWORKSPACE));
 187
 188     SetScrollbars(15, 18, 100, 100);
 189 }
 190
 191 wxPreviewCanvas::~wxPreviewCanvas()
 192 {
 193 }
 194
 195 void wxPreviewCanvas::OnPaint(wxPaintEvent& WXUNUSED(event))
 196 {
 197     wxPaintDC dc(this);
 198     PrepareDC( dc );
 199
 200 /*
 201 #ifdef __WXGTK__
 202     if (!GetUpdateRegion().IsEmpty())
 203         dc.SetClippingRegion( GetUpdateRegion() );
 204 #endif
 205 */
 206
 207     if (m_printPreview)
 208     {
 209         m_printPreview->PaintPage(this, dc);
 210     }
 211 }
 212
 213 // Responds to colour changes, and passes event on to children.
 214 void wxPreviewCanvas::OnSysColourChanged(wxSysColourChangedEvent& event)
 215 {
 216     SetBackgroundColour(wxSystemSettings::GetColour(wxSYS_COLOUR_APPWORKSPACE));
 217     Refresh();
 218
 219     // Propagate the event to the non-top-level children
 220     wxWindow::OnSysColourChanged(event);
 221 }
 222
 223 /*
 224 * Preview control bar
 225 */
 226
 227 BEGIN_EVENT_TABLE(wxPreviewControlBar, wxPanel)
 228     EVT_BUTTON(wxID_PREVIEW_CLOSE,    wxPreviewControlBar::OnWindowClose)
 229     EVT_BUTTON(wxID_PREVIEW_PRINT,    wxPreviewControlBar::OnPrint)
 230     EVT_BUTTON(wxID_PREVIEW_PREVIOUS, wxPreviewControlBar::OnPreviousButton)
 231     EVT_BUTTON(wxID_PREVIEW_NEXT,     wxPreviewControlBar::OnNextButton)
 232     EVT_CHAR(wxPreviewControlBar::OnChar)
 233     EVT_CHOICE(wxID_PREVIEW_ZOOM,     wxPreviewControlBar::OnZoom)
 234     EVT_PAINT(wxPreviewControlBar::OnPaint)
 235 END_EVENT_TABLE()
 236
 237 wxPreviewControlBar::wxPreviewControlBar(wxPrintPreviewBase *preview, long buttons,
 238                                          wxWindow *parent, const wxPoint& pos, const wxSize& size,
 239                                          long style, const wxString& name):
 240 wxPanel(parent, -1, pos, size, style, name)
 241 {
 242     m_printPreview = preview;
 243     m_closeButton = (wxButton *) NULL;
 244     m_nextPageButton = (wxButton *) NULL;
 245     m_previousPageButton = (wxButton *) NULL;
 246     m_printButton = (wxButton *) NULL;
 247     m_zoomControl = (wxChoice *) NULL;
 248     m_buttonFlags = buttons;
 249 }
 250
 251 wxPreviewControlBar::~wxPreviewControlBar()
 252 {
 253 }
 254
 255 void wxPreviewControlBar::OnPaint(wxPaintEvent& WXUNUSED(event))
 256 {
 257     wxPaintDC dc(this);
 258
 259     int w, h;
 260     GetSize(&w, &h);
 261     dc.SetPen(*wxBLACK_PEN);
 262     dc.SetBrush(*wxTRANSPARENT_BRUSH);
 263     dc.DrawLine( 0, h-1, w, h-1 );
 264 }
 265
 266 void wxPreviewControlBar::OnWindowClose(wxCommandEvent& WXUNUSED(event))
 267 {
 268     wxPreviewFrame *frame = (wxPreviewFrame *)GetParent();
 269     frame->Close(TRUE);
 270 }
 271
 272 void wxPreviewControlBar::OnPrint(wxCommandEvent& WXUNUSED(event))
 273 {
 274     wxPrintPreviewBase *preview = GetPrintPreview();
 275     preview->Print(TRUE);
 276 }
 277
 278 void wxPreviewControlBar::OnChar(wxKeyEvent &event)
 279 {
 280    switch(event.KeyCode())
 281    {
 282    case WXK_NEXT:
 283       OnNext(); break;
 284    case WXK_PRIOR:
 285       OnPrevious(); break;
 286    default:
 287       event.Skip();
 288    }
 289 }
 290
 291 void wxPreviewControlBar::OnNext(void)
 292 {
 293     wxPrintPreviewBase *preview = GetPrintPreview();
 294     if (preview)
 295     {
 296         int currentPage = preview->GetCurrentPage();
 297         if ((preview->GetMaxPage() > 0) &&
 298             (currentPage < preview->GetMaxPage()) &&
 299             preview->GetPrintout()->HasPage(currentPage + 1))
 300         {
 301             preview->SetCurrentPage(currentPage + 1);
 302         }
 303     }
 304 }
 305
 306 void wxPreviewControlBar::OnPrevious(void)
 307 {
 308     wxPrintPreviewBase *preview = GetPrintPreview();
 309     if (preview)
 310     {
 311         int currentPage = preview->GetCurrentPage();
 312         if ((preview->GetMinPage() > 0) &&
 313             (currentPage > preview->GetMinPage()) &&
 314             preview->GetPrintout()->HasPage(currentPage - 1))
 315         {
 316             preview->SetCurrentPage(currentPage - 1);
 317         }
 318     }
 319 }
 320
 321 void wxPreviewControlBar::OnZoom(wxCommandEvent& WXUNUSED(event))
 322 {
 323     int zoom = GetZoomControl();
 324     if (GetPrintPreview())
 325         GetPrintPreview()->SetZoom(zoom);
 326 }
 327
 328 void wxPreviewControlBar::CreateButtons()
 329 {
 330     SetSize(0, 0, 400, 40);
 331
 332     /*
 333     #ifdef __WXMSW__
 334     int fontSize = 9;
 335     #else
 336     int fontSize = 10;
 337     #endif
 338
 339       wxFont buttonFont(fontSize, wxSWISS, wxNORMAL, wxBOLD);
 340       SetFont(buttonFont);
 341     */
 342
 343     int buttonWidth = 65;
 344 #ifdef __WXGTK__
 345     int buttonHeight = -1;
 346 #else
 347     int buttonHeight = 24;
 348 #endif
 349
 350     int x = 5;
 351     int y = 5;
 352
 353 #ifdef __WXMOTIF__
 354     int gap = 15;
 355 #else
 356     int gap = 5;
 357 #endif
 358
 359     m_closeButton = new wxButton(this, wxID_PREVIEW_CLOSE, _("Close"),
 360         wxPoint(x, y), wxSize(buttonWidth, buttonHeight));
 361
 362     x += gap + buttonWidth;
 363
 364     if (m_buttonFlags & wxPREVIEW_PRINT)
 365     {
 366         m_printButton =  new wxButton(this, wxID_PREVIEW_PRINT, _("Print..."), wxPoint(x, y),
 367             wxSize(buttonWidth, buttonHeight));
 368         x += gap + buttonWidth;
 369     }
 370
 371     if (m_buttonFlags & wxPREVIEW_PREVIOUS)
 372     {
 373         m_previousPageButton = new wxButton(this, wxID_PREVIEW_PREVIOUS, wxT("<<"), wxPoint(x, y),
 374             wxSize(buttonWidth, buttonHeight));
 375         x += gap + buttonWidth;
 376     }
 377
 378     if (m_buttonFlags & wxPREVIEW_NEXT)
 379     {
 380         m_nextPageButton = new wxButton(this, wxID_PREVIEW_NEXT, wxT(">>"),
 381             wxPoint(x, y), wxSize(buttonWidth, buttonHeight));
 382         x += gap + buttonWidth;
 383     }
 384
 385     if (m_buttonFlags & wxPREVIEW_ZOOM)
 386     {
 387         static const char *choices[] =
 388         {
 389             "10%", "15%", "20%", "25%", "30%", "35%", "40%", "45%", "50%", "55%",
 390             "60%", "65%", "70%", "75%", "80%", "85%", "90%", "95%", "100%", "110%",
 391             "120%", "150%", "200%"
 392         };
 393
 394         int n = WXSIZEOF(choices);
 395
 396         wxString* strings = new wxString[n];
 397         int i;
 398         for (i = 0; i < n; i++ )
 399            strings[i] = choices[i];
 400
 401         m_zoomControl = new wxChoice(this, wxID_PREVIEW_ZOOM,
 402                                      wxPoint(x, y),
 403                                      wxSize(100, -1),
 404                                      n,
 405                                      strings
 406                                     );
 407         delete[] strings;
 408
 409         SetZoomControl(m_printPreview->GetZoom());
 410     }
 411
 412     //  m_closeButton->SetDefault();
 413 }
 414
 415 void wxPreviewControlBar::SetZoomControl(int zoom)
 416 {
 417     char buf[20];
 418     sprintf(buf, "%d%%", zoom);
 419 // Someone is calling methods that do no exist in wxChoice!! So I'll just comment out for VA for now
 420     if (m_zoomControl)
 421         m_zoomControl->SetStringSelection(buf);
 422 }
 423
 424 int wxPreviewControlBar::GetZoomControl()
 425 {
 426     wxChar buf[20];
 427     if (m_zoomControl && (m_zoomControl->GetStringSelection() != wxT("")))
 428     {
 429         wxStrcpy(buf, m_zoomControl->GetStringSelection());
 430         buf[wxStrlen(buf) - 1] = 0;
 431         return (int)wxAtoi(buf);
 432     }
 433     else return 0;
 434 }
 435
 436
 437 /*
 438 * Preview frame
 439 */
 440
 441 BEGIN_EVENT_TABLE(wxPreviewFrame, wxFrame)
 442     EVT_CLOSE(wxPreviewFrame::OnCloseWindow)
 443 END_EVENT_TABLE()
 444
 445 wxPreviewFrame::wxPreviewFrame(wxPrintPreviewBase *preview, wxFrame *parent, const wxString& title,
 446                                const wxPoint& pos, const wxSize& size, long style, const wxString& name):
 447 wxFrame(parent, -1, title, pos, size, style, name)
 448 {
 449     m_printPreview = preview;
 450     m_controlBar = NULL;
 451     m_previewCanvas = NULL;
 452 }
 453
 454 wxPreviewFrame::~wxPreviewFrame()
 455 {
 456 }
 457
 458 void wxPreviewFrame::OnCloseWindow(wxCloseEvent& WXUNUSED(event))
 459 {
 460     MakeModal(FALSE);
 461
 462     // Need to delete the printout and the print preview
 463     wxPrintout *printout = m_printPreview->GetPrintout();
 464     if (printout)
 465     {
 466         delete printout;
 467         m_printPreview->SetPrintout(NULL);
 468         m_printPreview->SetCanvas(NULL);
 469         m_printPreview->SetFrame(NULL);
 470     }
 471     delete m_printPreview;
 472
 473     Destroy();
 474 }
 475
 476 void wxPreviewFrame::Initialize()
 477 {
 478     CreateStatusBar();
 479
 480     CreateCanvas();
 481     CreateControlBar();
 482
 483     m_printPreview->SetCanvas(m_previewCanvas);
 484     m_printPreview->SetFrame(this);
 485
 486     // Set layout constraints here
 487
 488     // Control bar constraints
 489     wxLayoutConstraints *c1 = new wxLayoutConstraints;
 490     //  int w, h;
 491     //  m_controlBar->GetSize(&w, &h);
 492     int h;
 493 #if (defined(__WXMSW__) || defined(__WXGTK__))
 494     h = 40;
 495 #else
 496     h = 60;
 497 #endif
 498
 499     c1->left.SameAs       (this, wxLeft);
 500     c1->top.SameAs        (this, wxTop);
 501     c1->right.SameAs      (this, wxRight);
 502     c1->height.Absolute   (h);
 503
 504     m_controlBar->SetConstraints(c1);
 505
 506     // Canvas constraints
 507     wxLayoutConstraints *c2 = new wxLayoutConstraints;
 508
 509     c2->left.SameAs       (this, wxLeft);
 510     c2->top.Below         (m_controlBar);
 511     c2->right.SameAs      (this, wxRight);
 512     c2->bottom.SameAs     (this, wxBottom);
 513
 514     m_previewCanvas->SetConstraints(c2);
 515
 516     SetAutoLayout(TRUE);
 517
 518     MakeModal(TRUE);
 519
 520     Layout();
 521 }
 522
 523 void wxPreviewFrame::CreateCanvas()
 524 {
 525     m_previewCanvas = new wxPreviewCanvas(m_printPreview, this);
 526 }
 527
 528 void wxPreviewFrame::CreateControlBar()
 529 {
 530     long buttons = wxPREVIEW_DEFAULT;
 531     if (m_printPreview->GetPrintoutForPrinting())
 532         buttons |= wxPREVIEW_PRINT;
 533
 534     m_controlBar = new wxPreviewControlBar(m_printPreview, buttons, this, wxPoint(0, 0), wxSize(400, 40));
 535     m_controlBar->CreateButtons();
 536 }
 537
 538 /*
 539 * Print preview
 540 */
 541
 542 wxPrintPreviewBase::wxPrintPreviewBase(wxPrintout *printout,
 543                                        wxPrintout *printoutForPrinting,
 544                                        wxPrintData *data)
 545 {
 546     if (data)
 547         m_printDialogData = (*data);
 548
 549     Init(printout, printoutForPrinting);
 550 }
 551
 552 wxPrintPreviewBase::wxPrintPreviewBase(wxPrintout *printout,
 553                                        wxPrintout *printoutForPrinting,
 554                                        wxPrintDialogData *data)
 555 {
 556     if (data)
 557         m_printDialogData = (*data);
 558
 559     Init(printout, printoutForPrinting);
 560 }
 561
 562 void wxPrintPreviewBase::Init(wxPrintout *printout,
 563                               wxPrintout *printoutForPrinting)
 564 {
 565     m_isOk = TRUE;
 566     m_previewPrintout = printout;
 567     if (m_previewPrintout)
 568         m_previewPrintout->SetIsPreview(TRUE);
 569
 570     m_printPrintout = printoutForPrinting;
 571
 572     m_previewCanvas = NULL;
 573     m_previewFrame = NULL;
 574     m_previewBitmap = NULL;
 575     m_currentPage = 1;
 576     m_currentZoom = 70;
 577     m_topMargin = 40;
 578     m_leftMargin = 40;
 579     m_pageWidth = 0;
 580     m_pageHeight = 0;
 581     m_printingPrepared = FALSE;
 582
 583     // Too soon! Moved to RenderPage.
 584     // printout->OnPreparePrinting();
 585
 586     // Get some parameters from the printout, if defined
 587     int selFrom, selTo;
 588     printout->GetPageInfo(&m_minPage, &m_maxPage, &selFrom, &selTo);
 589 }
 590
 591 wxPrintPreviewBase::~wxPrintPreviewBase()
 592 {
 593     if (m_previewPrintout)
 594         delete m_previewPrintout;
 595     if (m_previewBitmap)
 596         delete m_previewBitmap;
 597     if (m_printPrintout)
 598         delete m_printPrintout;
 599 }
 600
 601 bool wxPrintPreviewBase::SetCurrentPage(int pageNum)
 602 {
 603     if (m_currentPage == pageNum)
 604         return TRUE;
 605
 606     m_currentPage = pageNum;
 607     if (m_previewBitmap)
 608     {
 609         delete m_previewBitmap;
 610         m_previewBitmap = NULL;
 611     }
 612
 613     if (m_previewCanvas)
 614     {
 615         if (!RenderPage(pageNum))
 616                 return FALSE;
 617         m_previewCanvas->Refresh();
 618     }
 619     return TRUE;
 620 }
 621
 622 bool wxPrintPreviewBase::PaintPage(wxWindow *canvas, wxDC& dc)
 623 {
 624     DrawBlankPage(canvas, dc);
 625
 626     if (!m_previewBitmap)
 627         if (!RenderPage(m_currentPage))
 628                 return FALSE;
 629
 630     if (!m_previewBitmap)
 631         return FALSE;
 632
 633     if (!canvas)
 634         return FALSE;
 635
 636     int canvasWidth, canvasHeight;
 637     canvas->GetSize(&canvasWidth, &canvasHeight);
 638
 639     double zoomScale = ((float)m_currentZoom/(float)100);
 640     double actualWidth = (zoomScale*m_pageWidth*m_previewScale);
 641     //  float actualHeight = (float)(zoomScale*m_pageHeight*m_previewScale);
 642
 643     int x = (int) ((canvasWidth - actualWidth)/2.0);
 644     if (x < m_leftMargin)
 645         x = m_leftMargin;
 646     int y = m_topMargin;
 647
 648     wxMemoryDC temp_dc;
 649     temp_dc.SelectObject(*m_previewBitmap);
 650
 651     dc.Blit(x, y, m_previewBitmap->GetWidth(), m_previewBitmap->GetHeight(), &temp_dc, 0, 0);
 652
 653     temp_dc.SelectObject(wxNullBitmap);
 654
 655     return TRUE;
 656 }
 657
 658 bool wxPrintPreviewBase::RenderPage(int pageNum)
 659 {
 660     wxBusyCursor busy;
 661
 662     int canvasWidth, canvasHeight;
 663
 664     if (!m_previewCanvas)
 665     {
 666         wxFAIL_MSG(_T("wxPrintPreviewBase::RenderPage: must use wxPrintPreviewBase::SetCanvas to let me know about the canvas!"));
 667
 668         return FALSE;
 669     }
 670     m_previewCanvas->GetSize(&canvasWidth, &canvasHeight);
 671
 672     double zoomScale = (m_currentZoom/100.0);
 673     int actualWidth = (int)(zoomScale*m_pageWidth*m_previewScale);
 674     int actualHeight = (int)(zoomScale*m_pageHeight*m_previewScale);
 675
 676     int x = (int)((canvasWidth - actualWidth)/2.0);
 677     if (x < m_leftMargin)
 678         x = m_leftMargin;
 679     //  int y = m_topMargin;
 680
 681
 682     if (!m_previewBitmap)
 683     {
 684         m_previewBitmap = new wxBitmap((int)actualWidth, (int)actualHeight);
 685         if (!m_previewBitmap || !m_previewBitmap->Ok())
 686         {
 687             if (m_previewBitmap) {
 688                 delete m_previewBitmap;
 689                 m_previewBitmap = NULL;
 690             }
 691             wxMessageBox(_("Sorry, not enough memory to create a preview."), _("Print Preview Failure"), wxOK);
 692             return FALSE;
 693         }
 694     }
 695
 696     wxMemoryDC memoryDC;
 697     memoryDC.SelectObject(*m_previewBitmap);
 698
 699     memoryDC.Clear();
 700
 701     m_previewPrintout->SetDC(&memoryDC);
 702     m_previewPrintout->SetPageSizePixels(m_pageWidth, m_pageHeight);
 703
 704     // Need to delay OnPreparePrinting until here, so we have enough information.
 705     if (!m_printingPrepared)
 706     {
 707         m_previewPrintout->OnPreparePrinting();
 708         m_printingPrepared = TRUE;
 709     }
 710
 711     m_previewPrintout->OnBeginPrinting();
 712
 713     if (!m_previewPrintout->OnBeginDocument(m_printDialogData.GetFromPage(), m_printDialogData.GetToPage()))
 714     {
 715         wxMessageBox(_("Could not start document preview."), _("Print Preview Failure"), wxOK);
 716
 717         memoryDC.SelectObject(wxNullBitmap);
 718
 719         delete m_previewBitmap;
 720         m_previewBitmap = NULL;
 721         return FALSE;
 722     }
 723
 724     m_previewPrintout->OnPrintPage(pageNum);
 725     m_previewPrintout->OnEndDocument();
 726     m_previewPrintout->OnEndPrinting();
 727
 728     m_previewPrintout->SetDC(NULL);
 729
 730     memoryDC.SelectObject(wxNullBitmap);
 731
 732     wxChar buf[200];
 733     if (m_maxPage != 0)
 734         wxSprintf(buf, _("Page %d of %d"), pageNum, m_maxPage);
 735     else
 736         wxSprintf(buf, _("Page %d"), pageNum);
 737
 738     if (m_previewFrame)
 739         m_previewFrame->SetStatusText(buf);
 740
 741     return TRUE;
 742 }
 743
 744
 745 bool wxPrintPreviewBase::DrawBlankPage(wxWindow *canvas, wxDC& dc)
 746 {
 747     int canvasWidth, canvasHeight;
 748     canvas->GetSize(&canvasWidth, &canvasHeight);
 749
 750     float zoomScale = (float)((float)m_currentZoom/(float)100);
 751     float actualWidth = zoomScale*m_pageWidth*m_previewScale;
 752     float actualHeight = zoomScale*m_pageHeight*m_previewScale;
 753
 754     float x = (float)((canvasWidth - actualWidth)/2.0);
 755     if (x < m_leftMargin)
 756         x = (float)m_leftMargin;
 757     float y = (float)m_topMargin;
 758
 759     // Draw shadow, allowing for 1-pixel border AROUND the actual page
 760     int shadowOffset = 4;
 761     dc.SetPen(*wxBLACK_PEN);
 762     dc.SetBrush(*wxBLACK_BRUSH);
 763     /*
 764     dc.DrawRectangle((int)(x-1 + shadowOffset), (int)(y-1 + shadowOffset), (int)(actualWidth+2), (int)(actualHeight+2));
 765     */
 766     dc.DrawRectangle((int)(x + shadowOffset), (int)(y + actualHeight+1), (int)(actualWidth), shadowOffset);
 767     dc.DrawRectangle((int)(x + actualWidth), (int)(y + shadowOffset), shadowOffset, (int)(actualHeight));
 768
 769     // Draw blank page allowing for 1-pixel border AROUND the actual page
 770     dc.SetPen(*wxBLACK_PEN);
 771     dc.SetBrush(*wxWHITE_BRUSH);
 772
 773     /*
 774     wxRegion update_region = canvas->GetUpdateRegion();
 775     wxRect r = update_region.GetBox();
 776
 777       printf( "x: %d y: %d w: %d h: %d.\n", (int)r.x, (int)r.y, (int)r.width, (int)r.height );
 778     */
 779
 780     dc.DrawRectangle((int)(x-2), (int)(y-1), (int)(actualWidth+3), (int)(actualHeight+2));
 781
 782     return TRUE;
 783 }
 784
 785 void wxPrintPreviewBase::SetZoom(int percent)
 786 {
 787     if (m_currentZoom == percent)
 788         return;
 789
 790     m_currentZoom = percent;
 791     if (m_previewBitmap)
 792     {
 793         delete m_previewBitmap;
 794         m_previewBitmap = NULL;
 795     }
 796
 797     if (m_previewCanvas)
 798     {
 799         RenderPage(m_currentPage);
 800         ((wxScrolledWindow *) m_previewCanvas)->Scroll(0, 0);
 801         m_previewCanvas->Clear();
 802         m_previewCanvas->Refresh();
 803     }
 804 }
 805
 806 #endif // wxUSE_PRINTING_ARCHITECTURE