source: trunk/src/gui/painting/qpaintengine_preview.cpp@ 574

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#include <private/qpaintengine_preview_p.h>
#include <private/qpainter_p.h>
#include <private/qpaintengine_p.h>
#include <private/qpicture_p.h>

#include <QtGui/qprintengine.h>
#include <QtGui/qpainter.h>
#include <QtGui/qpicture.h>

#ifndef QT_NO_PRINTPREVIEWWIDGET
QT_BEGIN_NAMESPACE

class QPreviewPaintEnginePrivate : public QPaintEnginePrivate
{
    Q_DECLARE_PUBLIC(QPreviewPaintEngine)
public:
    QPreviewPaintEnginePrivate() : state(QPrinter::Idle) {}
    ~QPreviewPaintEnginePrivate() {}

    QList<const QPicture *> pages;
    QPaintEngine *engine;
    QPainter *painter;
    QPrinter::PrinterState state;

    QPaintEngine *proxy_paint_engine;
    QPrintEngine *proxy_print_engine;
};


QPreviewPaintEngine::QPreviewPaintEngine()
    : QPaintEngine(*(new QPreviewPaintEnginePrivate), PaintEngineFeatures(AllFeatures & ~ObjectBoundingModeGradients))
{
    Q_D(QPreviewPaintEngine);
    d->proxy_print_engine = 0;
    d->proxy_paint_engine = 0;
}

QPreviewPaintEngine::~QPreviewPaintEngine()
{
    Q_D(QPreviewPaintEngine);

    qDeleteAll(d->pages);
}

bool QPreviewPaintEngine::begin(QPaintDevice *)
{
    Q_D(QPreviewPaintEngine);

    qDeleteAll(d->pages);
    d->pages.clear();

    QPicture *page = new QPicture;
    page->d_func()->in_memory_only = true;
    d->painter = new QPainter(page);
    d->engine = d->painter->paintEngine();
    d->pages.append(page);
    d->state = QPrinter::Active;
    return true;
}

bool QPreviewPaintEngine::end()
{
    Q_D(QPreviewPaintEngine);

    delete d->painter;
    d->painter = 0;
    d->engine = 0;
    d->state = QPrinter::Idle;
    return true;
}

void QPreviewPaintEngine::updateState(const QPaintEngineState &state)
{