qabstracttextdocumentlayout.cpp

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39-
40#include <qabstracttextdocumentlayout.h>-
41#include <qtextformat.h>-
42#include "qtextdocument_p.h"-
43#include "qtextengine_p.h"-
44-
45#include "qabstracttextdocumentlayout_p.h"-
46-
47QT_BEGIN_NAMESPACE-
48-
49QAbstractTextDocumentLayoutPrivate::~QAbstractTextDocumentLayoutPrivate()-
50{-
51}-
52-
53QTextObjectInterface::~QTextObjectInterface()-
54{-
55 // must be empty until ### Qt 6-
56}-
57-
58/*!-
59 \class QAbstractTextDocumentLayout-
60 \reentrant-
61-
62 \brief The QAbstractTextDocumentLayout class is an abstract base-
63 class used to implement custom layouts for QTextDocuments.-
64 \inmodule QtGui-
65-
66 \ingroup richtext-processing-
67-
68 The standard layout provided by Qt can handle simple word processing-
69 including inline images, lists and tables.-
70-
71 Some applications, e.g., a word processor or a DTP application might need-
72 more features than the ones provided by Qt's layout engine, in which case-
73 you can subclass QAbstractTextDocumentLayout to provide custom layout-
74 behavior for your text documents.-
75-
76 An instance of the QAbstractTextDocumentLayout subclass can be installed-
77 on a QTextDocument object with the-
78 \l{QTextDocument::}{setDocumentLayout()} function.-
79-
80 You can insert custom objects into a QTextDocument; see the-
81 QTextObjectInterface class description for details.-
82-
83 \sa QTextObjectInterface-
84*/-
85-
86/*!-
87 \class QTextObjectInterface-
88 \brief The QTextObjectInterface class allows drawing of-
89 custom text objects in \l{QTextDocument}s.-
90 \since 4.5-
91 \inmodule QtGui-
92-
93 A text object describes the structure of one or more elements in a-
94 text document; for instance, images imported from HTML are-
95 implemented using text objects. A text object knows how to lay out-
96 and draw its elements when a document is being rendered.-
97-
98 Qt allows custom text objects to be inserted into a document by-
99 registering a custom \l{QTextCharFormat::objectType()}{object-
100 type} with QTextCharFormat. A QTextObjectInterface must also be-
101 implemented for this type and be-
102 \l{QAbstractTextDocumentLayout::registerHandler()}{registered}-
103 with the QAbstractTextDocumentLayout of the document. When the-
104 object type is encountered while rendering a QTextDocument, the-
105 intrinsicSize() and drawObject() functions of the interface are-
106 called.-
107-
108 The following list explains the required steps of inserting a-
109 custom text object into a document:-
110-
111 \list-
112 \li Choose an \a objectType. The \a objectType is an integer with a-
113 value greater or equal to QTextFormat::UserObject.-
114 \li Create a QTextCharFormat object and set the object type to the-
115 chosen type using the setObjectType() function.-
116 \li Implement the QTextObjectInterface class.-
117 \li Call QAbstractTextDocumentLayout::registerHandler() with an instance of your-
118 QTextObjectInterface subclass to register your object type.-
119 \li Insert QChar::ObjectReplacementCharacter with the aforementioned-
120 QTextCharFormat of the chosen object type into the document.-
121 As mentioned, the functions of QTextObjectInterface-
122 \l{QTextObjectInterface::}{intrinsicSize()} and-
123 \l{QTextObjectInterface::}{drawObject()} will then be called with the-
124 QTextFormat as parameter whenever the replacement character is-
125 encountered.-
126 \endlist-
127-
128 A class implementing a text object needs to inherit both QObject-
129 and QTextObjectInterface. QObject must be the first class-
130 inherited. For instance:-
131-
132 \snippet qtextobject/textobjectinterface.h 0-
133-
134 The data of a text object is usually stored in the QTextCharFormat-
135 using QTextCharFormat::setProperty(), and then retrieved with-
136 QTextCharFormat::property().-
137-
138 \warning Copy and Paste operations ignore custom text objects.-
139-
140 \sa {Text Object Example}, QTextCharFormat, QTextLayout-
141*/-
142-
143/*!-
144 \fn QTextObjectInterface::~QTextObjectInterface()-
145-
146 Destroys this QTextObjectInterface.-
147*/-
148-
149/*!-
150 \fn virtual QSizeF QTextObjectInterface::intrinsicSize(QTextDocument *doc, int posInDocument, const QTextFormat &format) = 0-
151-
152 The intrinsicSize() function returns the size of the text object-
153 represented by \a format in the given document (\a doc) at the-
154 given position (\a posInDocument).-
155-
156 The size calculated will be used for subsequent calls to-
157 drawObject() for this \a format.-
158-
159 \sa drawObject()-
160*/-
161-
162/*!-
163 \fn virtual void QTextObjectInterface::drawObject(QPainter *painter, const QRectF &rect, QTextDocument *doc, int posInDocument, const QTextFormat &format) = 0-
164-
165 Draws this text object using the specified \a painter.-
166-
167 The size of the rectangle, \a rect, to draw in is the size-
168 previously calculated by intrinsicSize(). The rectangles position-
169 is relative to the \a painter.-
170-
171 You also get the document (\a doc) and the position (\a-
172 posInDocument) of the \a format in that document.-
173-
174 \sa intrinsicSize()-
175*/-
176-
177/*!-
178 \fn void QAbstractTextDocumentLayout::update(const QRectF &rect)-
179-
180 This signal is emitted when the rectangle \a rect has been updated.-
181-
182 Subclasses of QAbstractTextDocumentLayout should emit this signal when-
183 the layout of the contents change in order to repaint.-
184*/-
185-
186/*!-
187 \fn void QAbstractTextDocumentLayout::updateBlock(const QTextBlock &block)-
188 \since 4.4-
189-
190 This signal is emitted when the specified \a block has been updated.-
191-
192 Subclasses of QAbstractTextDocumentLayout should emit this signal when-
193 the layout of \a block has changed in order to repaint.-
194*/-
195-
196/*!-
197 \fn void QAbstractTextDocumentLayout::documentSizeChanged(const QSizeF &newSize)-
198-
199 This signal is emitted when the size of the document layout changes to-
200 \a newSize.-
201-
202 Subclasses of QAbstractTextDocumentLayout should emit this signal when the-
203 document's entire layout size changes. This signal is useful for widgets-
204 that display text documents since it enables them to update their scroll-
205 bars correctly.-
206-
207 \sa documentSize()-
208*/-
209-
210/*!-
211 \fn void QAbstractTextDocumentLayout::pageCountChanged(int newPages)-
212-
213 This signal is emitted when the number of pages in the layout changes;-
214 \a newPages is the updated page count.-
215-
216 Subclasses of QAbstractTextDocumentLayout should emit this signal when-
217 the number of pages in the layout has changed. Changes to the page count-
218 are caused by changes to the layout or the document content itself.-
219-
220 \sa pageCount()-
221*/-
222-
223/*!-
224 \fn int QAbstractTextDocumentLayout::pageCount() const-
225-
226 Returns the number of pages contained in the layout.-
227-
228 \sa pageCountChanged()-
229*/-
230-
231/*!-
232 \fn QSizeF QAbstractTextDocumentLayout::documentSize() const-
233-
234 Returns the total size of the document's layout.-
235-
236 This information can be used by display widgets to update their scroll bars-
237 correctly.-
238-
239 \sa documentSizeChanged(), QTextDocument::pageSize-
240*/-
241-
242/*!-
243 \fn void QAbstractTextDocumentLayout::draw(QPainter *painter, const PaintContext &context)-
244-
245 Draws the layout with the given \a painter using the given \a context.-
246*/-
247-
248/*!-
249 \fn int QAbstractTextDocumentLayout::hitTest(const QPointF &point, Qt::HitTestAccuracy accuracy) const-
250-
251 Returns the cursor position for the given \a point with the specified-
252 \a accuracy. Returns -1 if no valid cursor position was found.-
253*/-
254-
255/*!-
256 \fn void QAbstractTextDocumentLayout::documentChanged(int position, int charsRemoved, int charsAdded)-
257-
258 This function is called whenever the contents of the document change. A-
259 change occurs when text is inserted, removed, or a combination of these-
260 two. The change is specified by \a position, \a charsRemoved, and-
261 \a charsAdded corresponding to the starting character position of the-
262 change, the number of characters removed from the document, and the-
263 number of characters added.-
264-
265 For example, when inserting the text "Hello" into an empty document,-
266 \a charsRemoved would be 0 and \a charsAdded would be 5 (the length of-
267 the string).-
268-
269 Replacing text is a combination of removing and inserting. For example, if-
270 the text "Hello" gets replaced by "Hi", \a charsRemoved would be 5 and-
271 \a charsAdded would be 2.-
272-
273 For subclasses of QAbstractTextDocumentLayout, this is the central function-
274 where a large portion of the work to lay out and position document contents-
275 is done.-
276-
277 For example, in a subclass that only arranges blocks of text, an-
278 implementation of this function would have to do the following:-
279-
280 \list-
281 \li Determine the list of changed \l{QTextBlock}(s) using the parameters-
282 provided.-
283 \li Each QTextBlock object's corresponding QTextLayout object needs to-
284 be processed. You can access the \l{QTextBlock}'s layout using the-
285 QTextBlock::layout() function. This processing should take the-
286 document's page size into consideration.-
287 \li If the total number of pages changed, the pageCountChanged() signal-
288 should be emitted.-
289 \li If the total size changed, the documentSizeChanged() signal should-
290 be emitted.-
291 \li The update() signal should be emitted to schedule a repaint of areas-
292 in the layout that require repainting.-
293 \endlist-
294-
295 \sa QTextLayout-
296*/-
297-
298/*!-
299 \class QAbstractTextDocumentLayout::PaintContext-
300 \reentrant-
301 \inmodule QtGui-
302-
303 \brief The QAbstractTextDocumentLayout::PaintContext class is a convenience-
304 class defining the parameters used when painting a document's layout.-
305-
306 A paint context is used when rendering custom layouts for QTextDocuments-
307 with the QAbstractTextDocumentLayout::draw() function. It is specified by-
308 a \l {cursorPosition}{cursor position}, \l {palette}{default text color},-
309 \l clip rectangle and a collection of \l selections.-
310-
311 \sa QAbstractTextDocumentLayout-
312*/-
313-
314/*!-
315 \fn QAbstractTextDocumentLayout::PaintContext::PaintContext()-
316 \internal-
317*/-
318-
319/*!-
320 \variable QAbstractTextDocumentLayout::PaintContext::cursorPosition-
321-
322 \brief the position within the document, where the cursor line should be-
323 drawn.-
324-
325 The default value is -1.-
326*/-
327-
328/*!-
329 \variable QAbstractTextDocumentLayout::PaintContext::palette-
330-
331 \brief the default color that is used for the text, when no color is-
332 specified.-
333-
334 The default value is the application's default palette.-
335*/-
336-
337/*!-
338 \variable QAbstractTextDocumentLayout::PaintContext::clip-
339-
340 \brief a hint to the layout specifying the area around paragraphs, frames-
341 or text require painting.-
342-
343 Everything outside of this rectangle does not need to be painted.-
344-
345 Specifying a clip rectangle can speed up drawing of large documents-
346 significantly. Note that the clip rectangle is in document coordinates (not-
347 in viewport coordinates). It is not a substitute for a clip region set on-
348 the painter but merely a hint.-
349-
350 The default value is a null rectangle indicating everything needs to be-
351 painted.-
352*/-
353-
354/*!-
355 \variable QAbstractTextDocumentLayout::PaintContext::selections-
356-
357 \brief the collection of selections that will be rendered when passing this-
358 paint context to QAbstractTextDocumentLayout's draw() function.-
359-
360 The default value is an empty vector indicating no selection.-
361*/-
362-
363/*!-
364 \class QAbstractTextDocumentLayout::Selection-
365 \reentrant-
366 \inmodule QtGui-
367-
368 \brief The QAbstractTextDocumentLayout::Selection class is a convenience-
369 class defining the parameters of a selection.-
370-
371 A selection can be used to specify a part of a document that should be-
372 highlighted when drawing custom layouts for QTextDocuments with the-
373 QAbstractTextDocumentLayout::draw() function. It is specified using-
374 \l cursor and a \l format.-
375-
376 \sa QAbstractTextDocumentLayout, PaintContext-
377*/-
378-
379/*!-
380 \variable QAbstractTextDocumentLayout::Selection::format-
381-
382 \brief the format of the selection-
383-
384 The default value is QTextFormat::InvalidFormat.-
385*/-
386-
387/*!-
388 \variable QAbstractTextDocumentLayout::Selection::cursor-
389 \brief the selection's cursor-
390-
391 The default value is a null cursor.-
392*/-
393-
394/*!-
395 Creates a new text document layout for the given \a document.-
396*/-
397QAbstractTextDocumentLayout::QAbstractTextDocumentLayout(QTextDocument *document)-
398 : QObject(*new QAbstractTextDocumentLayoutPrivate, document)-
399{-
400 Q_D(QAbstractTextDocumentLayout);-
401 d->setDocument(document);-
402}
never executed: end of block
0
403-
404/*!-
405 \internal-
406*/-
407QAbstractTextDocumentLayout::QAbstractTextDocumentLayout(QAbstractTextDocumentLayoutPrivate &p, QTextDocument *document)-
408 :QObject(p, document)-
409{-
410 Q_D(QAbstractTextDocumentLayout);-
411 d->setDocument(document);-
412}
never executed: end of block
0
413-
414/*!-
415 \internal-
416*/-
417QAbstractTextDocumentLayout::~QAbstractTextDocumentLayout()-
418{-
419}-
420-
421/*!-
422 Registers the given \a component as a handler for items of the given \a objectType.-
423-
424 \note registerHandler() has to be called once for each object type. This-
425 means that there is only one handler for multiple replacement characters-
426 of the same object type.-
427-
428 The text document layout does not take ownership of \c component.-
429*/-
430void QAbstractTextDocumentLayout::registerHandler(int objectType, QObject *component)-
431{-
432 Q_D(QAbstractTextDocumentLayout);-
433-
434 QTextObjectInterface *iface = qobject_cast<QTextObjectInterface *>(component);-
435 if (!iface)
!ifaceDescription
TRUEnever evaluated
FALSEnever evaluated
0
436 return; // ### print error message on terminal?
never executed: return;
0
437-
438 connect(component, SIGNAL(destroyed(QObject*)), this, SLOT(_q_handlerDestroyed(QObject*)));-
439-
440 QTextObjectHandler h;-
441 h.iface = iface;-
442 h.component = component;-
443 d->handlers.insert(objectType, h);-
444}
never executed: end of block
0
445-
446/*!-
447 \since 5.2-
448-
449 Unregisters the given \a component as a handler for items of the given \a objectType, or-
450 any handler if the \a component is not specified.-
451*/-
452void QAbstractTextDocumentLayout::unregisterHandler(int objectType, QObject *component)-
453{-
454 Q_D(QAbstractTextDocumentLayout);-
455-
456 const auto it = d->handlers.constFind(objectType);-
457 if (it != d->handlers.cend() && (!component || component == it->component)) {
it != d->handlers.cend()Description
TRUEnever evaluated
FALSEnever evaluated
!componentDescription
TRUEnever evaluated
FALSEnever evaluated
component == it->componentDescription
TRUEnever evaluated
FALSEnever evaluated
0
458 if (component)
componentDescription
TRUEnever evaluated
FALSEnever evaluated
0
459 disconnect(component, SIGNAL(destroyed(QObject*)), this, SLOT(_q_handlerDestroyed(QObject*)));
never executed: disconnect(component, qFlagLocation("2""destroyed(QObject*)" "\0" __FILE__ ":" "459"), this, qFlagLocation("1""_q_handlerDestroyed(QObject*)" "\0" __FILE__ ":" "459"));
0
460 d->handlers.erase(it);-
461 }
never executed: end of block
0
462}
never executed: end of block
0
463-
464/*!-
465 Returns a handler for objects of the given \a objectType.-
466*/-
467QTextObjectInterface *QAbstractTextDocumentLayout::handlerForObject(int objectType) const-
468{-
469 Q_D(const QAbstractTextDocumentLayout);-
470-
471 QTextObjectHandler handler = d->handlers.value(objectType);-
472 if (!handler.component)
!handler.componentDescription
TRUEnever evaluated
FALSEnever evaluated
0
473 return 0;
never executed: return 0;
0
474-
475 return handler.iface;
never executed: return handler.iface;
0
476}-
477-
478/*!-
479 Sets the size of the inline object \a item corresponding to the text-
480 \a format.-
481-
482 \a posInDocument specifies the position of the object within the document.-
483-
484 The default implementation resizes the \a item to the size returned by-
485 the object handler's intrinsicSize() function. This function is called only-
486 within Qt. Subclasses can reimplement this function to customize the-
487 resizing of inline objects.-
488*/-
489void QAbstractTextDocumentLayout::resizeInlineObject(QTextInlineObject item, int posInDocument, const QTextFormat &format)-
490{-
491 Q_D(QAbstractTextDocumentLayout);-
492-
493 QTextCharFormat f = format.toCharFormat();-
494 Q_ASSERT(f.isValid());-
495 QTextObjectHandler handler = d->handlers.value(f.objectType());-
496 if (!handler.component)
!handler.componentDescription
TRUEnever evaluated
FALSEnever evaluated
0
497 return;
never executed: return;
0
498-
499 QSizeF s = handler.iface->intrinsicSize(document(), posInDocument, format);-
500 item.setWidth(s.width());-
501 item.setAscent(s.height());-
502 item.setDescent(0);-
503}
never executed: end of block
0
504-
505/*!-
506 Lays out the inline object \a item using the given text \a format.-
507-
508 \a posInDocument specifies the position of the object within the document.-
509-
510 The default implementation does nothing. This function is called only-
511 within Qt. Subclasses can reimplement this function to customize the-
512 position of inline objects.-
513-
514 \sa drawInlineObject()-
515*/-
516void QAbstractTextDocumentLayout::positionInlineObject(QTextInlineObject item, int posInDocument, const QTextFormat &format)-
517{-
518 Q_UNUSED(item);-
519 Q_UNUSED(posInDocument);-
520 Q_UNUSED(format);-
521}
never executed: end of block
0
522-
523/*!-
524 \fn void QAbstractTextDocumentLayout::drawInlineObject(QPainter *painter, const QRectF &rect, QTextInlineObject object, int posInDocument, const QTextFormat &format)-
525-
526 This function is called to draw the inline object, \a object, with the-
527 given \a painter within the rectangle specified by \a rect using the-
528 specified text \a format.-
529-
530 \a posInDocument specifies the position of the object within the document.-
531-
532 The default implementation calls drawObject() on the object handlers. This-
533 function is called only within Qt. Subclasses can reimplement this function-
534 to customize the drawing of inline objects.-
535-
536 \sa draw()-
537*/-
538void QAbstractTextDocumentLayout::drawInlineObject(QPainter *p, const QRectF &rect, QTextInlineObject item,-
539 int posInDocument, const QTextFormat &format)-
540{-
541 Q_UNUSED(item);-
542 Q_D(QAbstractTextDocumentLayout);-
543-
544 QTextCharFormat f = format.toCharFormat();-
545 Q_ASSERT(f.isValid());-
546 QTextObjectHandler handler = d->handlers.value(f.objectType());-
547 if (!handler.component)
!handler.componentDescription
TRUEnever evaluated
FALSEnever evaluated
0
548 return;
never executed: return;
0
549-
550 handler.iface->drawObject(p, rect, document(), posInDocument, format);-
551}
never executed: end of block
0
552-
553void QAbstractTextDocumentLayoutPrivate::_q_handlerDestroyed(QObject *obj)-
554{-
555 HandlerHash::Iterator it = handlers.begin();-
556 while (it != handlers.end())
it != handlers.end()Description
TRUEnever evaluated
FALSEnever evaluated
0
557 if ((*it).component == obj)
(*it).component == objDescription
TRUEnever evaluated
FALSEnever evaluated
0
558 it = handlers.erase(it);
never executed: it = handlers.erase(it);
0
559 else-
560 ++it;
never executed: ++it;
0
561}
never executed: end of block
0
562-
563/*!-
564 \internal-
565-
566 Returns the index of the format at position \a pos.-
567*/-
568int QAbstractTextDocumentLayout::formatIndex(int pos)-
569{-
570 QTextDocumentPrivate *pieceTable = qobject_cast<QTextDocument *>(parent())->docHandle();-
571 return pieceTable->find(pos).value()->format;
never executed: return pieceTable->find(pos).value()->format;
0
572}-
573-
574/*!-
575 \fn QTextCharFormat QAbstractTextDocumentLayout::format(int position)-
576-
577 Returns the character format that is applicable at the given \a position.-
578*/-
579QTextCharFormat QAbstractTextDocumentLayout::format(int pos)-
580{-
581 QTextDocumentPrivate *pieceTable = qobject_cast<QTextDocument *>(parent())->docHandle();-
582 int idx = pieceTable->find(pos).value()->format;-
583 return pieceTable->formatCollection()->charFormat(idx);
never executed: return pieceTable->formatCollection()->charFormat(idx);
0
584}-
585-
586-
587-
588/*!-
589 Returns the text document that this layout is operating on.-
590*/-
591QTextDocument *QAbstractTextDocumentLayout::document() const-
592{-
593 Q_D(const QAbstractTextDocumentLayout);-
594 return d->document;
never executed: return d->document;
0
595}-
596-
597/*!-
598 \fn QString QAbstractTextDocumentLayout::anchorAt(const QPointF &position) const-
599-
600 Returns the reference of the anchor the given \a position, or an empty-
601 string if no anchor exists at that point.-
602*/-
603QString QAbstractTextDocumentLayout::anchorAt(const QPointF& pos) const-
604{-
605 int cursorPos = hitTest(pos, Qt::ExactHit);-
606 if (cursorPos == -1)
cursorPos == -1Description
TRUEnever evaluated
FALSEnever evaluated
0
607 return QString();
never executed: return QString();
0
608-
609 // compensate for preedit in the hit text block-
610 QTextBlock block = document()->firstBlock();-
611 while (block.isValid()) {
block.isValid()Description
TRUEnever evaluated
FALSEnever evaluated
0
612 QRectF blockBr = blockBoundingRect(block);-
613 if (blockBr.contains(pos)) {
blockBr.contains(pos)Description
TRUEnever evaluated
FALSEnever evaluated
0
614 QTextLayout *layout = block.layout();-
615 int relativeCursorPos = cursorPos - block.position();-
616 const int preeditLength = layout ? layout->preeditAreaText().length() : 0;
layoutDescription
TRUEnever evaluated
FALSEnever evaluated
0
617 if (preeditLength > 0 && relativeCursorPos > layout->preeditAreaPosition())
preeditLength > 0Description
TRUEnever evaluated
FALSEnever evaluated
relativeCursor...AreaPosition()Description
TRUEnever evaluated
FALSEnever evaluated
0
618 cursorPos -= qMin(cursorPos - layout->preeditAreaPosition(), preeditLength);
never executed: cursorPos -= qMin(cursorPos - layout->preeditAreaPosition(), preeditLength);
0
619 break;
never executed: break;
0
620 }-
621 block = block.next();-
622 }
never executed: end of block
0
623-
624 QTextDocumentPrivate *pieceTable = qobject_cast<const QTextDocument *>(parent())->docHandle();-
625 QTextDocumentPrivate::FragmentIterator it = pieceTable->find(cursorPos);-
626 QTextCharFormat fmt = pieceTable->formatCollection()->charFormat(it->format);-
627 return fmt.anchorHref();
never executed: return fmt.anchorHref();
0
628}-
629-
630/*!-
631 \fn QRectF QAbstractTextDocumentLayout::frameBoundingRect(QTextFrame *frame) const-
632-
633 Returns the bounding rectangle of \a frame.-
634*/-
635-
636/*!-
637 \fn QRectF QAbstractTextDocumentLayout::blockBoundingRect(const QTextBlock &block) const-
638-
639 Returns the bounding rectangle of \a block.-
640*/-
641-
642/*!-
643 Sets the paint device used for rendering the document's layout to the given-
644 \a device.-
645-
646 \sa paintDevice()-
647*/-
648void QAbstractTextDocumentLayout::setPaintDevice(QPaintDevice *device)-
649{-
650 Q_D(QAbstractTextDocumentLayout);-
651 d->paintDevice = device;-
652}
never executed: end of block
0
653-
654/*!-
655 Returns the paint device used to render the document's layout.-
656-
657 \sa setPaintDevice()-
658*/-
659QPaintDevice *QAbstractTextDocumentLayout::paintDevice() const-
660{-
661 Q_D(const QAbstractTextDocumentLayout);-
662 return d->paintDevice;
never executed: return d->paintDevice;
0
663}-
664-
665QT_END_NAMESPACE-
666-
667#include "moc_qabstracttextdocumentlayout.cpp"-
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