summaryrefslogtreecommitdiffstats
path: root/src/gui/widgets/qprintpreviewwidget.cpp
blob: ceb0a0a69c5b1eb8274088e23da8dcdb33ac2c3a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtGui module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
** package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file.  Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://www.qtsoftware.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/

#include "qprintpreviewwidget.h"
#include <private/qprinter_p.h>

#include <QtCore/qmath.h>
#include <QtGui/qboxlayout.h>
#include <QtGui/qgraphicsitem.h>
#include <QtGui/qgraphicsview.h>
#include <QtGui/qscrollbar.h>
#include <QtGui/qstyleoption.h>

#ifndef QT_NO_PRINTPREVIEWWIDGET

QT_BEGIN_NAMESPACE

namespace {
class PageItem : public QGraphicsItem
{
public:
    PageItem(int _pageNum, const QPicture* _pagePicture, QSize _paperSize, QRect _pageRect)
        : pageNum(_pageNum), pagePicture(_pagePicture),
          paperSize(_paperSize), pageRect(_pageRect)
    {
        qreal border = qMax(paperSize.height(), paperSize.width()) / 25;
        brect = QRectF(QPointF(-border, -border),
                       QSizeF(paperSize)+QSizeF(2*border, 2*border));
        setCacheMode(DeviceCoordinateCache);
    }

    inline QRectF boundingRect() const
    { return brect; }

    inline int pageNumber() const
    { return pageNum; }

    void paint(QPainter *painter, const QStyleOptionGraphicsItem *item, QWidget *widget);

private:
    int pageNum;
    const QPicture* pagePicture;
    QSize paperSize;
    QRect pageRect;
    QRectF brect;
};

void PageItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
    Q_UNUSED(widget);

#if 0
    // Draw item bounding rect, for debugging
    painter->save();
    painter->setPen(QPen(Qt::red, 0));
    painter->setBrush(Qt::NoBrush);
    painter->drawRect(QRectF(-border()+1.0, -border()+1.0, boundingRect().width()-2, boundingRect().height()-2));
    painter->restore();
#endif

    QRectF paperRect(0,0, paperSize.width(), paperSize.height());

    painter->setClipRect(paperRect & option->exposedRect);
    painter->fillRect(paperRect, Qt::white);
    if (!pagePicture)
        return;
    painter->drawPicture(pageRect.topLeft(), *pagePicture);

    // Effect: make anything drawn in the margins look washed out.
    QPainterPath path;
    path.addRect(paperRect);
    path.addRect(pageRect);
    painter->setPen(QPen(Qt::NoPen));
    painter->setBrush(QColor(255, 255, 255, 180));
    painter->drawPath(path);

    painter->setClipRect(option->exposedRect);
#if 0
    // Draw frame around paper.
    painter->setPen(QPen(Qt::black, 0));
    painter->setBrush(Qt::NoBrush);
    painter->drawRect(paperRect);
#endif

    // Draw shadow
    qreal shWidth = paperRect.width()/100;
    QRectF rshadow(paperRect.topRight() + QPointF(0, shWidth),
                   paperRect.bottomRight() + QPointF(shWidth, 0));
    QLinearGradient rgrad(rshadow.topLeft(), rshadow.topRight());
    rgrad.setColorAt(0.0, QColor(0,0,0,255));
    rgrad.setColorAt(1.0, QColor(0,0,0,0));
    painter->fillRect(rshadow, QBrush(rgrad));
    QRectF bshadow(paperRect.bottomLeft() + QPointF(shWidth, 0),
                   paperRect.bottomRight() + QPointF(0, shWidth));
    QLinearGradient bgrad(bshadow.topLeft(), bshadow.bottomLeft());
    bgrad.setColorAt(0.0, QColor(0,0,0,255));
    bgrad.setColorAt(1.0, QColor(0,0,0,0));
    painter->fillRect(bshadow, QBrush(bgrad));
    QRectF cshadow(paperRect.bottomRight(),
                   paperRect.bottomRight() + QPointF(shWidth, shWidth));
    QRadialGradient cgrad(cshadow.topLeft(), shWidth, cshadow.topLeft());
    cgrad.setColorAt(0.0, QColor(0,0,0,255));
    cgrad.setColorAt(1.0, QColor(0,0,0,0));
    painter->fillRect(cshadow, QBrush(cgrad));

    // todo: drawtext "Page N" below paper
}

class GraphicsView : public QGraphicsView
{
    Q_OBJECT
public:
    GraphicsView(QWidget* parent = 0)
        : QGraphicsView(parent)
        {}
signals:
    void resized();

protected:
    void resizeEvent(QResizeEvent* e)
    {
        QGraphicsView::resizeEvent(e);
        emit resized();
    }

    void showEvent(QShowEvent* e)
    {
        QGraphicsView::showEvent(e);
        emit resized();
    }
};

} // anonymous namespace

class QPrintPreviewWidgetPrivate
{
    Q_DECLARE_PUBLIC(QPrintPreviewWidget)
public:
    QPrintPreviewWidgetPrivate(QPrintPreviewWidget *q)
        : q_ptr(q), scene(0), curPage(1),
          viewMode(QPrintPreviewWidget::SinglePageView),
          zoomMode(QPrintPreviewWidget::FitInView),
          zoomFactor(1), initialized(false), fitting(true)
    {}

    // private slots
    void _q_fit(bool doFitting = false);
    void _q_updateCurrentPage();

    void init();
    void populateScene();
    void layoutPages();
    void generatePreview();
    void setCurrentPage(int pageNumber);
    void zoom(qreal zoom);
    void setZoomFactor(qreal zoomFactor);
    int calcCurrentPage();

    QPrintPreviewWidget *q_ptr;
    GraphicsView *graphicsView;
    QGraphicsScene *scene;

    int curPage;
    QList<const QPicture *> pictures;
    QList<QGraphicsItem *> pages;

    QPrintPreviewWidget::ViewMode viewMode;
    QPrintPreviewWidget::ZoomMode zoomMode;
    qreal zoomFactor;
    bool ownPrinter;
    QPrinter* printer;
    bool initialized;
    bool fitting;
};

void QPrintPreviewWidgetPrivate::_q_fit(bool doFitting)
{
    Q_Q(QPrintPreviewWidget);

    if (curPage < 1 || curPage > pages.count())
        return;

    if (!doFitting && !fitting)
        return;

    if (doFitting && fitting) {
        QRect viewRect = graphicsView->viewport()->rect();
        if (zoomMode == QPrintPreviewWidget::FitInView) {
            QList<QGraphicsItem*> containedItems = graphicsView->items(viewRect, Qt::ContainsItemBoundingRect);
            foreach(QGraphicsItem* item, containedItems) {
                PageItem* pg = static_cast<PageItem*>(item);
                if (pg->pageNumber() == curPage)
                    return;
            }
        }

        int newPage = calcCurrentPage();
        if (newPage != curPage)
            curPage = newPage;
    }

    QRectF target = pages.at(curPage-1)->sceneBoundingRect();
    if (viewMode == QPrintPreviewWidget::FacingPagesView) {
        // fit two pages
        if (curPage % 2)
            target.setLeft(target.left() - target.width());
        else
            target.setRight(target.right() + target.width());
    } else if (viewMode == QPrintPreviewWidget::AllPagesView) {
        target = scene->itemsBoundingRect();
    }

    if (zoomMode == QPrintPreviewWidget::FitToWidth) {
        QTransform t;
        qreal scale = graphicsView->viewport()->width() / target.width();
        t.scale(scale, scale);
        graphicsView->setTransform(t);
        if (doFitting && fitting) {
            QRectF viewSceneRect = graphicsView->viewportTransform().mapRect(graphicsView->viewport()->rect());
            viewSceneRect.moveTop(target.top());
            graphicsView->ensureVisible(viewSceneRect); // Nah...
        }
    } else {
        graphicsView->fitInView(target, Qt::KeepAspectRatio);
        if (zoomMode == QPrintPreviewWidget::FitInView) {
            int step = qRound(graphicsView->matrix().mapRect(target).height());
            graphicsView->verticalScrollBar()->setSingleStep(step);
            graphicsView->verticalScrollBar()->setPageStep(step);
        }
    }

    zoomFactor = graphicsView->transform().m11() * (float(printer->logicalDpiY()) / q->logicalDpiY());
    emit q->previewChanged();
}

void QPrintPreviewWidgetPrivate::_q_updateCurrentPage()
{
    Q_Q(QPrintPreviewWidget);

    if (viewMode == QPrintPreviewWidget::AllPagesView)
        return;

    int newPage = calcCurrentPage();
    if (newPage != curPage) {
        curPage = newPage;
        emit q->previewChanged();
    }
}

int QPrintPreviewWidgetPrivate::calcCurrentPage()
{
    int maxArea = 0;
    int newPage = curPage;
    QRect viewRect = graphicsView->viewport()->rect();
    QList<QGraphicsItem*> items = graphicsView->items(viewRect);
    for (int i=0; i<items.size(); ++i) {
        PageItem* pg = static_cast<PageItem*>(items.at(i));
        QRect overlap = graphicsView->mapFromScene(pg->sceneBoundingRect()).boundingRect() & viewRect;
        int area = overlap.width() * overlap.height();
        if (area > maxArea) {
            maxArea = area;
            newPage = pg->pageNumber();
        } else if (area == maxArea && pg->pageNumber() < newPage) {
            newPage = pg->pageNumber();
        }
    }
    return newPage;
}

void QPrintPreviewWidgetPrivate::init()
{
    Q_Q(QPrintPreviewWidget);

    graphicsView = new GraphicsView;
    graphicsView->setInteractive(false);
    graphicsView->setDragMode(QGraphicsView::ScrollHandDrag);
    graphicsView->setViewportUpdateMode(QGraphicsView::SmartViewportUpdate);
    QObject::connect(graphicsView->verticalScrollBar(), SIGNAL(valueChanged(int)),
                     q, SLOT(_q_updateCurrentPage()));
    QObject::connect(graphicsView, SIGNAL(resized()), q, SLOT(_q_fit()));

    scene = new QGraphicsScene(graphicsView);
    scene->setBackgroundBrush(Qt::gray);
    graphicsView->setScene(scene);

    QVBoxLayout *layout = new QVBoxLayout;
    q->setLayout(layout);
    layout->setContentsMargins(0, 0, 0, 0);
    layout->addWidget(graphicsView);
}

void QPrintPreviewWidgetPrivate::populateScene()
{
    // remove old pages
    for (int i = 0; i < pages.size(); i++)
        scene->removeItem(pages.at(i));
    qDeleteAll(pages);
    pages.clear();

    int numPages = pictures.count();
    QSize paperSize = printer->paperRect().size();
    QRect pageRect = printer->pageRect();

    for (int i = 0; i < numPages; i++) {
        PageItem* item = new PageItem(i+1, pictures.at(i), paperSize, pageRect);
        scene->addItem(item);
        pages.append(item);
    }
}

void QPrintPreviewWidgetPrivate::layoutPages()
{
    int numPages = pages.count();
    if (numPages < 1)
        return;

    int numPagePlaces = numPages;
    int cols = 1; // singleMode and default
    if (viewMode == QPrintPreviewWidget::AllPagesView) {
        if (printer->orientation() == QPrinter::Portrait)
            cols = qCeil(qSqrt((float) numPages));
        else
            cols = qFloor(qSqrt((float) numPages));
        cols += cols % 2;  // Nicer with an even number of cols
    }
    else if (viewMode == QPrintPreviewWidget::FacingPagesView) {
        cols = 2;
        numPagePlaces += 1;
    }
    int rows = qCeil(qreal(numPagePlaces) / cols);

    qreal itemWidth = pages.at(0)->boundingRect().width();
    qreal itemHeight = pages.at(0)->boundingRect().height();
    int pageNum = 1;
    for (int i = 0; i < rows && pageNum <= numPages; i++) {
        for (int j = 0; j < cols && pageNum <= numPages; j++) {
            if (!i && !j && viewMode == QPrintPreviewWidget::FacingPagesView) {
                // Front page doesn't have a facing page
                continue;
            } else {
                pages.at(pageNum-1)->setPos(QPointF(j*itemWidth, i*itemHeight));
                pageNum++;
            }
        }
    }
    scene->setSceneRect(scene->itemsBoundingRect());
}

void QPrintPreviewWidgetPrivate::generatePreview()
{
    //### If QPrinter::setPreviewMode() becomes public, handle the
    //### case that we have been constructed with a printer that
    //### _already_ has been preview-painted to, so we should
    //### initially just show the pages it already contains, and not
    //### emit paintRequested() until the user changes some parameter

    Q_Q(QPrintPreviewWidget);
    printer->d_func()->setPreviewMode(true);
    emit q->paintRequested(printer);
    printer->d_func()->setPreviewMode(false);
    pictures = printer->d_func()->previewPages();
    populateScene(); // i.e. setPreviewPrintedPictures() e.l.
    layoutPages();
    curPage = qBound(1, curPage, pages.count());
    if (fitting)
        _q_fit();
    emit q->previewChanged();
}

void QPrintPreviewWidgetPrivate::setCurrentPage(int pageNumber)
{
    if (pageNumber < 1 || pageNumber > pages.count())
        return;

    int lastPage = curPage;
    curPage = pageNumber;

    if (lastPage != curPage && lastPage > 0 && lastPage <= pages.count()) {
        if (zoomMode != QPrintPreviewWidget::FitInView) {
            QScrollBar *hsc = graphicsView->horizontalScrollBar();
            QScrollBar *vsc = graphicsView->verticalScrollBar();
            QPointF pt = graphicsView->transform().map(pages.at(curPage-1)->pos());
            vsc->setValue(int(pt.y()) - 10);
            hsc->setValue(int(pt.x()) - 10);
        } else {
            graphicsView->centerOn(pages.at(curPage-1));
        }
    }
}

void QPrintPreviewWidgetPrivate::zoom(qreal zoom)
{
    zoomFactor *= zoom;
    graphicsView->scale(zoom, zoom);
}

void QPrintPreviewWidgetPrivate::setZoomFactor(qreal _zoomFactor)
{
    Q_Q(QPrintPreviewWidget);
    zoomFactor = _zoomFactor;
    graphicsView->resetTransform();
    int dpi_y = q->logicalDpiY();
    int printer_dpi_y = printer->logicalDpiY();
    graphicsView->scale(zoomFactor*(dpi_y/float(printer_dpi_y)),
                        zoomFactor*(dpi_y/float(printer_dpi_y)));
}

///////////////////////////////////////

/*!
    \class QPrintPreviewWidget
    \since 4.4

    \brief The QPrintPreviewWidget class provides a widget for
    previewing page layouts for printer output.

    \ingroup multimedia

    QPrintPreviewDialog uses a QPrintPreviewWidget internally, and the
    purpose of QPrintPreviewWidget is to make it possible to embed the
    preview into other widgets. It also makes it possible to build a different
    user interface around it than the default one provided with QPrintPreviewDialog.

    Using QPrintPreviewWidget is straightforward:

    \list 1
    \o Create the QPrintPreviewWidget

    Construct the QPrintPreviewWidget either by passing in an
    exisiting QPrinter object, or have QPrintPreviewWidget create a
    default constructed QPrinter object for you.

    \o Connect the paintRequested() signal to a slot.

    When the widget needs to generate a set of preview pages, a
    paintRequested() signal will be emitted from the widget. Connect a
    slot to this signal, and draw onto the QPrinter passed in as a
    signal parameter. Call QPrinter::newPage(), to start a new
    page in the preview.

    \endlist

    \sa QPrinter, QPrintDialog, QPageSetupDialog, QPrintPreviewDialog
*/


/*!
    \enum QPrintPreviewWidget::ViewMode

    This enum is used to describe the view mode of the preview widget.

    \value SinglePageView   A mode where single pages in the preview
                            is viewed.

    \value FacingPagesView  A mode where the facing pages in the preview
                            is viewed.

    \value AllPagesView     A view mode where all the pages in the preview
                            is viewed.
*/

/*!
    \enum QPrintPreviewWidget::ZoomMode

    This enum is used to describe zoom mode of the preview widget.

    \value CustomZoom  The zoom is set to a custom zoom value.

    \value FitToWidth  This mode fits the current page to the width of the view.

    \value FitInView   This mode fits the current page inside the view.

*/

/*!
    Constructs a QPrintPreviewWidget based on \a printer and with \a
    parent as the parent widget. The widget flags \a flags are passed on
    to the QWidget constructor.

    \sa QWidget::setWindowFlags()
*/
QPrintPreviewWidget::QPrintPreviewWidget(QPrinter *printer, QWidget *parent, Qt::WindowFlags flags)
    : QWidget(parent, flags), d_ptr(new QPrintPreviewWidgetPrivate(this))
{
    Q_D(QPrintPreviewWidget);
    d->printer = printer;
    d->ownPrinter = false;
    d->init();
}

/*!
    \overload

    This will cause QPrintPreviewWidget to create an internal, default
    constructed QPrinter object, which will be used to generate the
    preview.
*/
QPrintPreviewWidget::QPrintPreviewWidget(QWidget *parent, Qt::WindowFlags flags)
    : QWidget(parent, flags), d_ptr(new QPrintPreviewWidgetPrivate(this))
{
    Q_D(QPrintPreviewWidget);
    d->printer = new QPrinter;
    d->ownPrinter = true;
    d->init();
}


/*!
    Destroys the QPrintPreviewWidget.
*/
QPrintPreviewWidget::~QPrintPreviewWidget()
{
    Q_D(QPrintPreviewWidget);
    if (d->ownPrinter)
        delete d->printer;
    delete d_ptr;
}

/*!
    Returns the current view mode. The default view mode is SinglePageView.
*/
QPrintPreviewWidget::ViewMode QPrintPreviewWidget::viewMode() const
{
    Q_D(const QPrintPreviewWidget);
    return d->viewMode;
}

/*!
    Sets the view mode to \a mode. The default view mode is
    SinglePageView.
*/
void QPrintPreviewWidget::setViewMode(ViewMode mode)
{
    Q_D(QPrintPreviewWidget);
    d->viewMode = mode;
    d->layoutPages();
    if (d->viewMode == AllPagesView) {
        d->graphicsView->fitInView(d->scene->itemsBoundingRect(), Qt::KeepAspectRatio);
        d->fitting = false;
        d->zoomMode = QPrintPreviewWidget::CustomZoom;
        d->zoomFactor = d->graphicsView->transform().m11() * (float(d->printer->logicalDpiY()) / logicalDpiY());
        emit previewChanged();
    } else {
        d->fitting = true;
        d->_q_fit();
    }
}

/*!
    Returns the current orientation of the preview. This value is
    obtained from the QPrinter object associated with the preview.
*/
QPrinter::Orientation QPrintPreviewWidget::orientation() const
{
    Q_D(const QPrintPreviewWidget);
    return d->printer->orientation();
}

/*!
    Sets the current orientation to \a orientation. This value will be
    set on the QPrinter object associated with the preview.
*/
void QPrintPreviewWidget::setOrientation(QPrinter::Orientation orientation)
{
    Q_D(QPrintPreviewWidget);
    d->printer->setOrientation(orientation);
    d->generatePreview();
}

/*!
    Prints the preview to the printer associated with the preview.
*/
void QPrintPreviewWidget::print()
{
    Q_D(QPrintPreviewWidget);
    // ### make use of the generated pages
    emit paintRequested(d->printer);
}

/*!
    Zooms the current view in by \a factor. The default value for \a
    factor is 1.1, which means the view will be scaled up by 10%.
*/
void QPrintPreviewWidget::zoomIn(qreal factor)
{
    Q_D(QPrintPreviewWidget);
    d->fitting = false;
    d->zoomMode = QPrintPreviewWidget::CustomZoom;
    d->zoom(factor);
}

/*!
    Zooms the current view out by \a factor. The default value for \a
    factor is 1.1, which means the view will be scaled down by 10%.
*/
void QPrintPreviewWidget::zoomOut(qreal factor)
{
    Q_D(QPrintPreviewWidget);
    d->fitting = false;
    d->zoomMode = QPrintPreviewWidget::CustomZoom;
    d->zoom(1/factor);
}

/*!
    Returns the zoom factor of the view.
*/
qreal QPrintPreviewWidget::zoomFactor() const
{
    Q_D(const QPrintPreviewWidget);
    return d->zoomFactor;
}

/*!
    Sets the zoom factor of the view to \a factor. For example, a
    value of 1.0 indicates an unscaled view, which is approximately
    the size the view will have on paper. A value of 0.5 will halve
    the size of the view, while a value of 2.0 will double the size of
    the view.
*/
void QPrintPreviewWidget::setZoomFactor(qreal factor)
{
    Q_D(QPrintPreviewWidget);
    d->fitting = false;
    d->zoomMode = QPrintPreviewWidget::CustomZoom;
    d->setZoomFactor(factor);
}

/*!
    Returns the number of pages in the preview.
*/
int QPrintPreviewWidget::numPages() const
{
    Q_D(const QPrintPreviewWidget);
    return d->pages.size();
}

/*!
    Returns the currently viewed page in the preview.
*/
int QPrintPreviewWidget::currentPage() const
{
    Q_D(const QPrintPreviewWidget);
    return d->curPage;
}

/*!
    Sets the current page in the preview. This will cause the view to
    skip to the beginning of \a page.
*/
void QPrintPreviewWidget::setCurrentPage(int page)
{
    Q_D(QPrintPreviewWidget);
    d->setCurrentPage(page);
}

/*!
    This is a convenience function and is the same as calling \c
    {setZoomMode(QPrintPreviewWidget::FitToWidth)}.
*/
void QPrintPreviewWidget::fitToWidth()
{
    setZoomMode(FitToWidth);
}

/*!
    This is a convenience function and is the same as calling \c
    {setZoomMode(QPrintPreviewWidget::FitInView)}.
*/
void QPrintPreviewWidget::fitInView()
{
    setZoomMode(FitInView);
}

/*!
    Sets the zoom mode to \a zoomMode. The default zoom mode is FitInView.

    \sa zoomMode(), viewMode(), setViewMode()
*/
void QPrintPreviewWidget::setZoomMode(QPrintPreviewWidget::ZoomMode zoomMode)
{
    Q_D(QPrintPreviewWidget);
    d->zoomMode = zoomMode;
    if (d->zoomMode == FitInView || d->zoomMode == FitToWidth) {
        d->fitting = true;
        d->_q_fit(true);
    } else {
        d->fitting = false;
    }
}

/*!
    Returns the current zoom mode.

    \sa setZoomMode(), viewMode(), setViewMode()
*/
QPrintPreviewWidget::ZoomMode QPrintPreviewWidget::zoomMode() const
{
    Q_D(const QPrintPreviewWidget);
    return d->zoomMode;
}

/*!
    This is a convenience function and is the same as calling \c
    {setOrientation(QPrinter::Landscape)}.
*/
void QPrintPreviewWidget::setLandscapeOrientation()
{
    setOrientation(QPrinter::Landscape);
}

/*!
    This is a convenience function and is the same as calling \c
    {setOrientation(QPrinter::Portrait)}.
*/
void QPrintPreviewWidget::setPortraitOrientation()
{
    setOrientation(QPrinter::Portrait);
}

/*!
    This is a convenience function and is the same as calling \c
    {setViewMode(QPrintPreviewWidget::SinglePageView)}.
*/
void QPrintPreviewWidget::setSinglePageViewMode()
{
    setViewMode(SinglePageView);
}

/*!
    This is a convenience function and is the same as calling \c
    {setViewMode(QPrintPreviewWidget::FacingPagesView)}.
*/
void QPrintPreviewWidget::setFacingPagesViewMode()
{
    setViewMode(FacingPagesView);
}

/*!
    This is a convenience function and is the same as calling \c
    {setViewMode(QPrintPreviewWidget::AllPagesView)}.
*/
void QPrintPreviewWidget::setAllPagesViewMode()
{
    setViewMode(AllPagesView);
}


/*!
    This function updates the preview, which causes the
    paintRequested() signal to be emitted.
*/
void QPrintPreviewWidget::updatePreview()
{
    Q_D(QPrintPreviewWidget);
    d->initialized = true;
    d->generatePreview();
    d->graphicsView->updateGeometry();
}

/*! \reimp
*/
void QPrintPreviewWidget::setVisible(bool visible)
{
    Q_D(QPrintPreviewWidget);
    if (visible && !d->initialized)
        updatePreview();
    QWidget::setVisible(visible);
}

/*!
    \fn void QPrintPreviewWidget::paintRequested(QPrinter *printer)

    This signal is emitted when the preview widget needs to generate a
    set of preview pages. \a printer is the printer associated with
    this preview widget.
*/

/*!
    \fn void QPrintPreviewWidget::previewChanged()

    This signal is emitted whenever the preview widget has changed
    some internal state, such as the orientation.
*/


QT_END_NAMESPACE

#include "moc_qprintpreviewwidget.cpp"
#include "qprintpreviewwidget.moc"

#endif // QT_NO_PRINTPREVIEWWIDGET