qprinter.cpp

奇趣公司比较新的qt/emd版本

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#include "qprinter_p.h"
#include "qprinter.h"
#include "qprintengine.h"
#include "qlist.h"
#include <qpagesetupdialog.h>
#include <qapplication.h>
#include <qfileinfo.h>
#if !defined(QT_NO_CUPS) && !defined(QT_NO_LIBRARY)
#include "private/qcups_p.h"
#endif

#ifndef QT_NO_PRINTER

#if defined (Q_WS_WIN)
#include <private/qprintengine_win_p.h>
#elif defined (Q_WS_MAC)
#include <private/qprintengine_mac_p.h>
#elif defined (QTOPIA_PRINTENGINE)
#include <private/qprintengine_qws_p.h>
#endif
#include <private/qprintengine_ps_p.h>

#ifndef QT_NO_PDF
#include "qprintengine_pdf_p.h"
#endif

#if defined(QT3_SUPPORT)
#  include "qprintdialog.h"
#endif // QT3_SUPPORT

#define ABORT_IF_ACTIVE(location) \
    if (d->printEngine->printerState() == QPrinter::Active) { \
        qWarning("%s: Cannot be changed while printer is active", location); \
        return; \
    }

void QPrinterPrivate::createDefaultEngines()
{
    QPrinter::OutputFormat realOutputFormat = outputFormat;
#if !defined (QTOPIA_PRINTENGINE)
#if defined (Q_OS_UNIX) && ! defined (Q_WS_MAC)
    if(outputFormat == QPrinter::NativeFormat) {
        realOutputFormat = QPrinter::PostScriptFormat;
    }
#endif
#endif

    switch (realOutputFormat) {
    case QPrinter::NativeFormat: {
#if defined (Q_WS_WIN)
        QWin32PrintEngine *winEngine = new QWin32PrintEngine(printerMode);
        paintEngine = winEngine;
        printEngine = winEngine;
#elif defined (Q_WS_MAC)
        QMacPrintEngine *macEngine = new QMacPrintEngine(printerMode);
        paintEngine = macEngine;
        printEngine = macEngine;
#elif defined (QTOPIA_PRINTENGINE)
        QtopiaPrintEngine *qwsEngine = new QtopiaPrintEngine(printerMode);
        paintEngine = qwsEngine;
        printEngine = qwsEngine;
#elif defined (Q_OS_UNIX)
        Q_ASSERT(false);
#endif
        }
        break;
    case QPrinter::PdfFormat: {
        QPdfEngine *pdfEngine = new QPdfEngine(printerMode);
        paintEngine = pdfEngine;
        printEngine = pdfEngine;
    }
        break;
    case QPrinter::PostScriptFormat: {
        QPSPrintEngine *psEngine = new QPSPrintEngine(printerMode);
        paintEngine = psEngine;
        printEngine = psEngine;
    }
        break;
    }
    use_default_engine = true;
}


/*!
  \class QPrinter
  \brief The QPrinter class is a paint device that paints on a printer.

  \ingroup multimedia
  \mainclass

  This device represents a series of pages of printed output, and is
  used in almost exactly the same way as other paint devices such as
  QWidget and QPixmap.
  A set of additional functions are provided to manage device-specific
  features, such as orientation and resolution, and to step through
  the pages in a document as it is generated.

  When printing directly to a printer on Windows or Mac OS X, QPrinter uses
  the built-in printer drivers. On X11, QPrinter uses the
  \l{Common Unix Printing System (CUPS)} or the standard Unix \l lpr utility
  to send PostScript or PDF output to the printer. As an alternative,
  the printProgram() function can be used to specify the command or utility
  to use instead of the system default.

  QPrinter supports a number of parameters, most of which can be
  changed by the end user through a \l{QPrintDialog}{print dialog}. In
  general, QPrinter passes these functions onto the underlying QPrintEngine.

  The most important parameters are:
  \list
  \i setOrientation() tells QPrinter which page orientation to use.
  \i setPageSize() tells QPrinter what page size to expect from the
  printer.
  \i setResolution() tells QPrinter what resolution you wish the
  printer to provide, in dots per inch (DPI).
  \i setFullPage() tells QPrinter whether you want to deal with the
  full page or just with the part the printer can draw on.
  \i setNumCopies() tells QPrinter how many copies of the document
  it should print.
  \endlist

  Many of these functions can only be called before the actual printing
  begins (i.e., before QPainter::begin() is called). This usually makes
  sense because, for example, it's not possible to change the number of
  copies when you are halfway through printing. There are also some
  settings that the user sets (through the printer dialog) and that
  applications are expected to obey. See QAbstractPrintDialog's
  documentation for more details.

  When QPainter::begin() is called, the QPrinter it operates on is prepared for
  a new page, enabling the QPainter to be used immediately to paint the first
  page in a document. Once the first page has been painted, newPage() can be
  called to request a new blank page to paint on, or QPainter::end() can be
  called to finish printing. The second page and all following pages are
  prepared using a call to newPage() before they are painted.

  The first page in a document does not need to be preceded by a call to
  newPage(). You only need to calling newPage() after QPainter::begin() if you
  need to insert a blank page at the beginning of a printed document.
  Similarly, calling newPage() after the last page in a document is painted will
  result in a trailing blank page appended to the end of the printed document.

  If you want to abort the print job, abort() will try its best to
  stop printing. It may cancel the entire job or just part of it.

  Since QPrinter can print to any QPrintEngine subclass, it is possible to
  extend printing support to cover new types of printing subsystem by
  subclassing QPrintEngine and reimplementing its interface.

  \sa QPrintDialog, {Printing with Qt}
*/

/*!
    \enum QPrinter::PrinterState

    \value Idle
    \value Active
    \value Aborted
    \value Error
*/

/*!
    \enum QPrinter::PrinterMode

    This enum describes the mode the printer should work in. It
    basically presets a certain resolution and working mode.

    \value ScreenResolution Sets the resolution of the print device to
    the screen resolution. This has the big advantage that the results
    obtained when painting on the printer will match more or less
    exactly the visible output on the screen. It is the easiest to
    use, as font metrics on the screen and on the printer are the
    same. This is the default value. ScreenResolution will produce a
    lower quality output than HighResolution and should only be used
    for drafts.

    \value PrinterResolution This value is deprecated. Is is
    equivalent to ScreenResolution on Unix and HighResolution on
    Windows and Mac. Due do the difference between ScreenResolution
    and HighResolution, use of this value may lead to non-portable
    printer code.

    \value HighResolution On Windows, sets the printer resolution to that
    defined for the printer in use. For PostScript printing, sets the
    resolution of the PostScript driver to 1200 dpi.

    \note When rendering text on a QPrinter device, it is important
    to realize that the size of text, when specified in points, is
    independent of the resolution specified for the device itself.
    Therefore, it may be useful to specify the font size in pixels
    when combining text with graphics to ensure that their relative
    sizes are what you expect.
*/

/*!
  \enum QPrinter::Orientation

  This enum type (not to be confused with \c Orientation) is used
  to specify each page's orientation.

  \value Portrait the page's height is greater than its width.

  \value Landscape the page's width is greater than its height.

  This type interacts with \l QPrinter::PageSize and
  QPrinter::setFullPage() to determine the final size of the page
  available to the application.
*/


/*!
    \enum QPrinter::PrintRange

    Used to specify the print range selection option.

    \value AllPages All pages should be printed.
    \value Selection Only the selection should be printed.
    \value PageRange The specified page range should be printed.

    \sa QAbstractPrintDialog::PrintRange
*/

/*!
    \enum QPrinter::PrinterOption
    \compat

    Use QAbstractPrintDialog::PrintDialogOption instead.

    \value PrintToFile
    \value PrintSelection
    \value PrintPageRange
*/

/*!
  \enum QPrinter::PageSize

  This enum type specifies what paper size QPrinter should use.
  QPrinter does not check that the paper size is available; it just
  uses this information, together with QPrinter::Orientation and
  QPrinter::setFullPage(), to determine the printable area.

  The defined sizes (with setFullPage(true)) are:

  \value A0 841 x 1189 mm
  \value A1 594 x 841 mm
  \value A2 420 x 594 mm
  \value A3 297 x 420 mm
  \value A4 210 x 297 mm, 8.26 x 11.69 inches
  \value A5 148 x 210 mm
  \value A6 105 x 148 mm
  \value A7 74 x 105 mm
  \value A8 52 x 74 mm
  \value A9 37 x 52 mm
  \value B0 1030 x 1456 mm
  \value B1 728 x 1030 mm
  \value B10 32 x 45 mm
  \value B2 515 x 728 mm
  \value B3 364 x 515 mm
  \value B4 257 x 364 mm
  \value B5 182 x 257 mm, 7.17 x 10.13 inches
  \value B6 128 x 182 mm
  \value B7 91 x 128 mm
  \value B8 64 x 91 mm
  \value B9 45 x 64 mm
  \value C5E 163 x 229 mm
  \value Comm10E 105 x 241 mm, U.S. Common 10 Envelope
  \value DLE 110 x 220 mm
  \value Executive 7.5 x 10 inches, 191 x 254 mm
  \value Folio 210 x 330 mm
  \value Ledger 432 x 279 mm
  \value Legal 8.5 x 14 inches, 216 x 356 mm
  \value Letter 8.5 x 11 inches, 216 x 279 mm
  \value Tabloid 279 x 432 mm
  \value Custom Unknown size

  With setFullPage(false) (the default), the metrics will be a bit
  smaller; how much depends on the printer in use.

  \omitvalue NPageSize
*/


/*!
  \enum QPrinter::PageOrder

  This enum type is used by QPrinter to tell the application program
  how to print.

  \value FirstPageFirst  the lowest-numbered page should be printed
  first.

  \value LastPageFirst  the highest-numbered page should be printed
  first.
*/

/*!
  \enum QPrinter::ColorMode

  This enum type is used to indicate whether QPrinter should print
  in color or not.

  \value Color  print in color if available, otherwise in grayscale.

  \value GrayScale  print in grayscale, even on color printers.
*/

/*!
  \enum QPrinter::PaperSource

  This enum type specifies what paper source QPrinter is to use.
  QPrinter does not check that the paper source is available; it
  just uses this information to try and set the paper source.
  Whether it will set the paper source depends on whether the
  printer has that particular source.

  \warning This is currently only implemented for Windows.

  \value Auto
  \value Cassette
  \value Envelope
  \value EnvelopeManual
  \value FormSource
  \value LargeCapacity
  \value LargeFormat
  \value Lower
  \value MaxPageSource
  \value Middle
  \value Manual
  \value OnlyOne
  \value Tractor
  \value SmallFormat
*/

/*
  \enum QPrinter::PrintRange

  This enum is used to specify which print range the application
  should use to print.

  \value AllPages All the pages should be printed.
  \value Selection Only the selection should be printed.
  \value PageRange Print according to the from page and to page options.

  \sa setPrintRange(), printRange()
*/

/*
  \enum QPrinter::PrinterOption

  This enum describes various printer options that appear in the
  printer setup dialog. It is used to enable and disable these
  options in the setup dialog.

  \value PrintToFile Describes if print to file should be enabled.
  \value PrintSelection Describes if printing selections should be enabled.
  \value PrintPageRange Describes if printing page ranges (from, to) should
  be enabled

  \sa setOptionEnabled(), isOptionEnabled()
*/

/*!
    Creates a new printer object with the given \a mode.
*/
QPrinter::QPrinter(PrinterMode mode)
    : QPaintDevice(),
      d_ptr(new QPrinterPrivate(this))
{
    if (!qApp) {
        qFatal("QPrinter: Must construct a QApplication before a QPaintDevice");
        return;
    }
    Q_D(QPrinter);

    d->printerMode = mode;
    d->outputFormat = QPrinter::NativeFormat;
    d->createDefaultEngines();

#if !defined(QT_NO_CUPS) && !defined(QT_NO_LIBRARY)
    if (QCUPSSupport::cupsVersion() >= 10200 && QCUPSSupport().currentPPD()) {
        setOutputFormat(QPrinter::PdfFormat);
        d->outputFormat = QPrinter::NativeFormat;
    }
#endif
}

/*!
    This function is used by subclasses of QPrinter to specify custom
    print and paint engines (\a printEngine and \a paintEngine,
    respectively).

    QPrinter does not take ownership of the engines, so you need to
    manage these engine instances yourself.

    Note that changing the engines will reset the printer state and
    all its properties.

    \sa printEngine() paintEngine() setOutputFormat()

    \since 4.1
*/
void QPrinter::setEngines(QPrintEngine *printEngine, QPaintEngine *paintEngine)
{
    Q_D(QPrinter);

    if (d->use_default_engine)
        delete d->printEngine;

    d->printEngine = printEngine;
    d->paintEngine = paintEngine;