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Implemented high-quality preview for wxMSW (this approach doesn't work

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on other platforms). The preview is now accurate representation of printed
page and wxHtmlEasyPrinting preview shows identical layout to what will
be printed.


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@54264 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Václav Slavík
2008-06-16 08:41:51 +00:00
parent 9f7e7edb78
commit 25a3fca2e5
5 changed files with 362 additions and 32 deletions
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75
src/common/prntbase.cpp
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@@ -1535,6 +1535,47 @@ void wxPrintPreviewBase::AdjustScrollbars(wxPreviewCanvas *canvas)
canvas->SetScrollbars(10, 10, scrollUnitsX, scrollUnitsY, 0, 0, true);
}
bool wxPrintPreviewBase::RenderPageIntoDC(wxDC& dc, int pageNum)
{
m_previewPrintout->SetDC(&dc);
m_previewPrintout->SetPageSizePixels(m_pageWidth, m_pageHeight);
// Need to delay OnPreparePrinting() until here, so we have enough
// information.
if (!m_printingPrepared)
{
m_previewPrintout->OnPreparePrinting();
int selFrom, selTo;
m_previewPrintout->GetPageInfo(&m_minPage, &m_maxPage, &selFrom, &selTo);
m_printingPrepared = true;
}
m_previewPrintout->OnBeginPrinting();
if (!m_previewPrintout->OnBeginDocument(m_printDialogData.GetFromPage(), m_printDialogData.GetToPage()))
{
wxMessageBox(_("Could not start document preview."), _("Print Preview Failure"), wxOK);
return false;
}
m_previewPrintout->OnPrintPage(pageNum);
m_previewPrintout->OnEndDocument();
m_previewPrintout->OnEndPrinting();
m_previewPrintout->SetDC(NULL);
return true;
}
bool wxPrintPreviewBase::RenderPageIntoBitmap(wxBitmap& bmp, int pageNum)
{
wxMemoryDC memoryDC;
memoryDC.SelectObject(bmp);
memoryDC.Clear();
return RenderPageIntoDC(memoryDC, pageNum);
}
bool wxPrintPreviewBase::RenderPage(int pageNum)
{
wxBusyCursor busy;
@@ -1560,43 +1601,13 @@ bool wxPrintPreviewBase::RenderPage(int pageNum)
}
}
wxMemoryDC memoryDC;
memoryDC.SelectObject(*m_previewBitmap);
memoryDC.Clear();
m_previewPrintout->SetDC(&memoryDC);
m_previewPrintout->SetPageSizePixels(m_pageWidth, m_pageHeight);
// Need to delay OnPreparePrinting until here, so we have enough information.
if (!m_printingPrepared)
if ( !RenderPageIntoBitmap(*m_previewBitmap, pageNum) )
{
m_previewPrintout->OnPreparePrinting();
int selFrom, selTo;
m_previewPrintout->GetPageInfo(&m_minPage, &m_maxPage, &selFrom, &selTo);
m_printingPrepared = true;
}
m_previewPrintout->OnBeginPrinting();
if (!m_previewPrintout->OnBeginDocument(m_printDialogData.GetFromPage(), m_printDialogData.GetToPage()))
{
wxMessageBox(_("Could not start document preview."), _("Print Preview Failure"), wxOK);
memoryDC.SelectObject(wxNullBitmap);
InvalidatePreviewBitmap();
wxMessageBox(_("Sorry, not enough memory to create a preview."), _("Print Preview Failure"), wxOK);
return false;
}
m_previewPrintout->OnPrintPage(pageNum);
m_previewPrintout->OnEndDocument();
m_previewPrintout->OnEndPrinting();
m_previewPrintout->SetDC(NULL);
memoryDC.SelectObject(wxNullBitmap);
#if wxUSE_STATUSBAR
wxString status;
if (m_maxPage != 0)