c436b31065
under MacOS X. Documented the existence of the GNOME printing code. git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@31164 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
85 lines
3.9 KiB
TeX
85 lines
3.9 KiB
TeX
\section{Printing overview}\label{printingoverview}
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Classes: \helpref{wxPrintout}{wxprintout},
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\helpref{wxPrinter}{wxprinter},
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\helpref{wxPrintPreview}{wxprintpreview},
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\helpref{wxPrinterDC}{wxprinterdc},
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\helpref{wxPrintDialog}{wxprintdialog},
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\helpref{wxPrintData}{wxprintdata},
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\helpref{wxPrintDialogData}{wxprintdialogdata},
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\helpref{wxPageSetupDialog}{wxpagesetupdialog},
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\helpref{wxPageSetupDialogData}{wxpagesetupdialogdata}
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The printing framework relies on the application to provide classes
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whose member functions can respond to particular requests, such
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as `print this page' or `does this page exist in the document?'.
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This method allows wxWidgets to take over the housekeeping duties of
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turning preview pages, calling the print dialog box, creating
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the printer device context, and so on: the application can concentrate
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on the rendering of the information onto a device context.
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The \helpref{document/view framework}{docviewoverview} creates a default
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wxPrintout object for every view, calling wxView::OnDraw to achieve a
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prepackaged print/preview facility.
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A document's printing ability is represented in an application by a
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derived wxPrintout class. This class prints a page on request, and can
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be passed to the Print function of a wxPrinter object to actually print
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the document, or can be passed to a wxPrintPreview object to initiate
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previewing. The following code (from the printing sample) shows how easy
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it is to initiate printing, previewing and the print setup dialog, once the wxPrintout
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functionality has been defined. Notice the use of MyPrintout for
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both printing and previewing. All the preview user interface functionality
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is taken care of by wxWidgets. For details on how MyPrintout is defined,
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please look at the printout sample code.
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\begin{verbatim}
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case WXPRINT_PRINT:
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{
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wxPrinter printer;
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MyPrintout printout("My printout");
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printer.Print(this, &printout, true);
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break;
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}
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case WXPRINT_PREVIEW:
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{
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// Pass two printout objects: for preview, and possible printing.
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wxPrintPreview *preview = new wxPrintPreview(new MyPrintout, new MyPrintout);
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wxPreviewFrame *frame = new wxPreviewFrame(preview, this, "Demo Print Preview", wxPoint(100, 100), wxSize(600, 650));
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frame->Centre(wxBOTH);
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frame->Initialize();
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frame->Show(true);
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break;
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}
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\end{verbatim}
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\section{Printing under Unix (GTK+)}\label{unixprinting}
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Printing under Unix has always been a cause of problems as Unix
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does not provide a standard way to display text and graphics
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on screen and print it to a printer using the same application
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programming interface - instead, displaying on screen is done
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via the X11 library while printing has to be done with using
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PostScript commands. This was particularly difficult to handle
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for the case of fonts with the result that only a selected
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number of application could offer WYSIWYG under Unix. Equally,
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wxWidgets offered its own printing implementation using PostScript
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which never really matched the screen display.
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Starting with version 2.8.X, the GNOME project provides printing
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support through the libgnomeprint and libgnomeprintui libraries
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by which especially the font problem is mostly solved. Beginning
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with version 2.5.4, the GTK+ port of wxWidgets can make use of
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these libraries if wxWidgets is configured accordingly and if the
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libraries are present. You need to configure wxWidgets with the
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{\it configure --with-gnomeprint} switch and you application will
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then search for the GNOME print libraries at runtime. If they
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are found, printing will be done through these, otherwise the
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application will fall back to the old PostScript printing code.
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Note that the application will not require the GNOME print libraries
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to be installed in order to run (there will be no dependency on
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these libraries).
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It is expected that the printing code that is currently implemented
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in the GNOME print libraries will be moved into GTK+ later.
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