print.tex

很牛的GUI源码wxWidgets-2.8.0.zip 可在多种平台下运行.

\membersection{wxPrinter::GetAbort}\label{wxprintergetabort}

\func{bool}{GetAbort}{\void}

Returns true if the user has aborted the print job.


\membersection{wxPrinter::GetLastError}\label{wxprintergetlasterror}

\func{static wxPrinterError}{GetLastError}{\void}

Return last error. Valid after calling \helpref{Print}{wxprinterprint},
\helpref{PrintDialog}{wxprinterprintdialog} or 
\helpref{wxPrintPreview::Print}{wxprintpreviewprint}. These functions 
set last error to {\bf wxPRINTER\_NO\_ERROR} if no error happened.

Returned value is one of the following:

\twocolwidtha{7cm}
\begin{twocollist}\itemsep=0pt
\twocolitem{{\bf wxPRINTER\_NO\_ERROR}}{No error happened.}
\twocolitem{{\bf wxPRINTER\_CANCELLED}}{The user cancelled printing.}
\twocolitem{{\bf wxPRINTER\_ERROR}}{There was an error during printing.}
\end{twocollist}



\membersection{wxPrinter::GetPrintDialogData}\label{wxprintergetprintdialogdata}

\func{wxPrintDialogData\&}{GetPrintDialogData}{\void}

Returns the \helpref{print data}{wxprintdata} associated with the printer object.


\membersection{wxPrinter::Print}\label{wxprinterprint}

\func{bool}{Print}{\param{wxWindow *}{parent}, \param{wxPrintout *}{printout}, \param{bool }{prompt=true}}

Starts the printing process. Provide a parent window, a user-defined wxPrintout object which controls
the printing of a document, and whether the print dialog should be invoked first.

Print could return false if there was a problem initializing the printer device context
(current printer not set, for example) or the user cancelled printing. Call
\helpref{wxPrinter::GetLastError}{wxprintergetlasterror} to get detailed
information about the kind of the error.


\membersection{wxPrinter::PrintDialog}\label{wxprinterprintdialog}

\func{wxDC*}{PrintDialog}{\param{wxWindow *}{parent}}

Invokes the print dialog. If successful (the user did not press Cancel
and no error occurred), a suitable device context will be returned
(otherwise NULL is returned -- call
\helpref{wxPrinter::GetLastError}{wxprintergetlasterror} to get detailed
information about the kind of the error).

The application must delete this device context to avoid a memory leak.


\membersection{wxPrinter::ReportError}\label{wxprinterreporterror}

\func{void}{ReportError}{\param{wxWindow *}{parent}, \param{wxPrintout *}{printout}, \param{const wxString\& }{message}}

Default error-reporting function.


\membersection{wxPrinter::Setup}\label{wxprintersetup}

\func{bool}{Setup}{\param{wxWindow *}{parent}}

Invokes the print setup dialog. Note that the setup dialog is obsolete from
Windows 95, though retained for backward compatibility.

\section{\class{wxPrinterDC}}\label{wxprinterdc}

A printer device context is specific to MSW and Mac, and allows access to any
printer with a Windows or Macintosh driver. See \helpref{wxDC}{wxdc} for further
information on device contexts, and \helpref{wxDC::GetSize}{wxdcgetsize} for
advice on achieving the correct scaling for the page.

\wxheading{Derived from}

\helpref{wxDC}{wxdc}\\
\helpref{wxObject}{wxdc}

\wxheading{Include files}

<wx/dcprint.h>

\wxheading{See also}

\helpref{Printing framework overview}{printingoverview}, 
\helpref{wxDC}{wxdc}

\latexignore{\rtfignore{\wxheading{Members}}}


\membersection{wxPrinterDC::wxPrinterDC}\label{wxprinterdcctor}

\func{}{wxPrinterDC}{\param{const wxPrintData\& }{printData}}

Constructor. Pass a \helpref{wxPrintData}{wxprintdata} object with information
necessary for setting up a suitable printer device context. This
is the recommended way to construct a wxPrinterDC.  Make sure you 
specify a reference to a \helpref{wxPrintData}{wxprintdata} object,
not a pointer - you may not even get a warning if you pass a pointer
instead.

\func{}{wxPrinterDC}{\param{const wxString\& }{driver}, \param{const wxString\& }{device}, \param{const wxString\& }{output},
 \param{const bool }{interactive = true}, \param{int }{orientation = wxPORTRAIT}}

Constructor. With empty strings for the first three arguments, the default printer dialog is
displayed. {\it device} indicates the type of printer and {\it output}
is an optional file for printing to. The {\it driver} parameter is
currently unused.  Use the {\it Ok} member to test whether the
constructor was successful in creating a usable device context.

This constructor is deprecated and retained only for backward compatibility.

\membersection{wxPrinterDC::GetPaperRect}\label{wxprinterdcgetpaperrect}

\func{wxRect}{wxPrinterDC::GetPaperRect}{}

Return the rectangle in device coordinates that corresponds to the full paper
area, including the nonprinting regions of the paper. The point (0,0) in device
coordinates is the top left corner of the page rectangle, which is the printable
area on MSW and Mac. The coordinates of the top left corner of the paper
rectangle will therefore have small negative values, while the bottom right
coordinates will be somewhat larger than the values returned by
\helpref{wxDC::GetSize}{wxdcgetsize}.


\section{\class{wxPrintout}}\label{wxprintout}

This class encapsulates the functionality of printing out an application
document. A new class must be derived and members overridden to respond to calls
such as OnPrintPage and HasPage and to render the print image onto an associated
\helpref{wxDC}{wxdc}. Instances of this class are passed to wxPrinter::Print or
to a wxPrintPreview object to initiate printing or previewing.

Your derived wxPrintout is responsible for drawing both the preview image and
the printed page. If your windows' drawing routines accept an arbitrary DC as an
argument, you can re-use those routines within your wxPrintout subclass to draw
the printout image. You may also add additional drawing elements within your
wxPrintout subclass, like headers, footers, and/or page numbers. However, the
image on the printed page will often differ from the image drawn on the screen,
as will the print preview image -- not just in the presence of headers and
footers, but typically in scale. A high-resolution printer presents a much
larger drawing surface (i.e., a higher-resolution DC); a zoomed-out preview
image presents a much smaller drawing surface (lower-resolution DC). By using
the routines FitThisSizeToXXX() and/or MapScreenSizeToXXX() within your
wxPrintout subclass to set the user scale and origin of the associated DC, you
can easily use a single drawing routine to draw on your application's windows,
to create the print preview image, and to create the printed paper image, and
achieve a common appearance to the preview image and the printed page.


\wxheading{Derived from}

\helpref{wxObject}{wxobject}

\wxheading{Include files}

<wx/print.h>

\wxheading{See also}

\helpref{Printing framework overview}{printingoverview}, 
\helpref{wxPrinterDC}{wxprinterdc}, 
\helpref{wxPrintDialog}{wxprintdialog}, 
\helpref{wxPageSetupDialog}{wxpagesetupdialog}, 
\helpref{wxPrinter}{wxprinter}, 
\helpref{wxPrintPreview}{wxprintpreview}

\latexignore{\rtfignore{\wxheading{Members}}}


\membersection{wxPrintout::wxPrintout}\label{wxprintoutctor}

\func{}{wxPrintout}{\param{const wxString\& }{title = "Printout"}}

Constructor. Pass an optional title argument - the current filename would be a good idea. This will appear in the printing list
(at least in MSW)


\membersection{wxPrintout::\destruct{wxPrintout}}\label{wxprintoutdtor}

\func{}{\destruct{wxPrintout}}{\void}

Destructor.


\membersection{wxPrintout::GetDC}\label{wxprintoutgetdc}

\func{wxDC *}{GetDC}{\void}

Returns the device context associated with the printout (given to the printout at start of
printing or previewing). This will be a wxPrinterDC if printing under Windows or Mac,
a wxPostScriptDC if printing on other platforms, and a wxMemoryDC if previewing.


\membersection{wxPrintout::GetPageInfo}\label{wxprintoutgetpageinfo}

\func{void}{GetPageInfo}{\param{int *}{minPage}, \param{int *}{maxPage}, \param{int *}{pageFrom}, \param{int *}{pageTo}}

Called by the framework to obtain information from the application about minimum
and maximum page values that the user can select, and the required page range to
be printed. By default this returns 1, 32000 for the page minimum and maximum
values, and 1, 1 for the required page range.

If {\it minPage} is zero, the page number controls in the print dialog will be disabled.

\pythonnote{When this method is implemented in a derived Python class,
it should be designed to take no parameters (other than the self
reference) and to return a tuple of four integers.
}

\perlnote{When this method is overridden in a derived class,
it must not take any parameters, and returns a 4-element list.
}


\membersection{wxPrintout::GetPageSizeMM}\label{wxprintoutgetpagesizemm}

\func{void}{GetPageSizeMM}{\param{int *}{w}, \param{int *}{h}}

Returns the size of the printer page in millimetres.

\pythonnote{This method returns the output-only parameters as a tuple.}

\perlnote{In wxPerl this method takes no arguments and returns a
2-element list {\tt ( w, h )}}


\membersection{wxPrintout::GetPageSizePixels}\label{wxprintoutgetpagesizepixels}

\func{void}{GetPageSizePixels}{\param{int *}{w}, \param{int *}{h}}

Returns the size of the printer page in pixels, called the \em{page rectangle}.
The page rectangle has a top left corner at (0,0) and a bottom right corner at
(w,h). These values may not be the same as the values returned from
\helpref{wxDC::GetSize}{wxdcgetsize}; if the printout is being used for
previewing, a memory device context is used, which uses a bitmap size reflecting
the current preview zoom. The application must take this discrepancy into
account if previewing is to be supported.

\pythonnote{This method returns the output-only parameters as a tuple.}

\perlnote{In wxPerl this method takes no arguments and returns a
2-element list {\tt ( w, h )}}


\membersection{wxPrintout::GetPaperRectPixels}\label{wxprintoutgetpaperrectpixels}

\func{wxRect}{GetPaperRectPixels}{}

Returns the rectangle that corresponds to the entire paper in pixels, called the
\em{paper rectangle}. This distinction between paper rectangle and page
rectangle reflects the fact that most printers cannot print all the way to the
edge of the paper. The page rectangle is a rectangle whose top left corner is at
(0,0) and whose width and height are given by
\helpref{wxDC::GetPageSizePixels}{wxprintoutgetpagesizepixels}. On MSW and Mac,
the page rectangle gives the printable area of the paper, while the paper
rectangle represents the entire paper, including non-printable borders. Thus,
the rectangle returned by GetPaperRectPixels will have a top left corner whose
coordinates are small negative numbers and the bottom right corner will have
values somewhat larger than the width and height given by
\helpref{wxDC::GetPageSizePixels}{wxprintoutgetpagesizepixels}. On other
platforms and for PostScript printing, the paper is treated as if its entire
area were printable, so this function will return the same rectangle as the page
rectangle.


\membersection{wxPrintout::GetPPIPrinter}\label{wxprintoutgetppiprinter}

\func{void}{GetPPIPrinter}{\param{int *}{w}, \param{int *}{h}}

Returns the number of pixels per logical inch of the printer device context.
Dividing the printer PPI by the screen PPI can give a suitable scaling factor
for drawing text onto the printer. Remember to multiply this by a scaling factor
to take the preview DC size into account. Or you can just use the
FitThisSizeToXXX() and MapScreenSizeToXXX routines below, which do most of the
scaling calculations for you.

\pythonnote{This method returns the output-only parameters as a tuple.}

\perlnote{In wxPerl this method takes no arguments and returns a
2-element list {\tt ( w, h )}}


\membersection{wxPrintout::GetPPIScreen}\label{wxprintoutgetppiscreen}

\func{void}{GetPPIScreen}{\param{int *}{w}, \param{int *}{h}}

Returns the number of pixels per logical inch of the screen device context.
Dividing the printer PPI by the screen PPI can give a suitable scaling factor
for drawing text onto the printer. If you are doing your own scaling, remember
to multiply this by a scaling factor to take the preview DC size into account.


\membersection{wxPrintout::GetTitle}\label{wxprintoutgettitle}

\func{wxString}{GetTitle}{\void}

Returns the title of the printout

\pythonnote{This method returns the output-only parameters as a tuple.}

\perlnote{In wxPerl this method takes no arguments and returns a
2-element list {\tt ( w, h )}}


\membersection{wxPrintout::HasPage}\label{wxprintouthaspage}

\func{bool}{HasPage}{\param{int}{ pageNum}}

Should be overridden to return true if the document has this page, or false
if not. Returning false signifies the end of the document. By default,
HasPage behaves as if the document has only one page.


\membersection{wxPrintout::IsPreview}\label{wxprintoutispreview}

\func{bool}{IsPreview}{\void}

Returns true if the printout is currently being used for previewing.


\membersection{wxPrintout::FitThisSizeToPaper}\label{wxprintoutfitthissizetopaper}

\func{void}{FitThisSizeToPaper}{\param{const wxSize\& }{imageSize}}

Set the user scale and device origin of the wxDC associated with this wxPrintout
so that the given image size fits entirely within the paper and the origin is at
the top left corner of the paper. Note that with most printers, the region
around the edges of the paper are not printable so that the edges of the image
could be cut off. Use this if you're managing your own page margins.

\membersection{wxPrintout::FitThisSizeToPage}\label{wxprintoutfitthissizetopage}


\func{void}{FitThisSizeToPage}{\param{const wxSize\& }{imageSize}}

Set the user scale and device origin of the wxDC associated with this wxPrintout
so that the given image size fits entirely within the page rectangle and the
origin is at the top left corner of the page rectangle. On MSW and Mac, the page
rectangle is the printable area of the page. On other platforms and PostScript
printing, the page rectangle is the entire paper. Use this if you want your
printed image as large as possible, but with the caveat that on some platforms, 
portions of the image might be cut off at the edges.


\membersection{wxPrintout::FitThisSizeToPageMargins}\label{wxprintoutfitthissizetopagemargins}