/**************************************************************************** ** ** Copyright (C) 1992-2007 Trolltech ASA. All rights reserved. ** ** This file is part of the QtGui module of the Qt Toolkit. ** ** This file may be used under the terms of the GNU General Public ** License version 2.0 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 GNU ** General Public Licensing requirements will be met: ** http://trolltech.com/products/qt/licenses/licensing/opensource/ ** ** If you are unsure which license is appropriate for your use, please ** review the following information: ** http://trolltech.com/products/qt/licenses/licensing/licensingoverview ** or contact the sales department at sales@trolltech.com. ** ** In addition, as a special exception, Trolltech gives you certain ** additional rights. These rights are described in the Trolltech GPL ** Exception version 1.0, which can be found at ** http://www.trolltech.com/products/qt/gplexception/ and in the file ** GPL_EXCEPTION.txt in this package. ** ** In addition, as a special exception, Trolltech, as the sole copyright ** holder for Qt Designer, grants users of the Qt/Eclipse Integration ** plug-in the right for the Qt/Eclipse Integration to link to ** functionality provided by Qt Designer and its related libraries. ** ** Trolltech reserves all rights not expressly granted herein. ** ** Trolltech ASA (c) 2007 ** ** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. ** ****************************************************************************/ #include #include #include "qtextdocument_p.h" #include "qtextengine_p.h" #include "qabstracttextdocumentlayout_p.h" /*! \class QAbstractTextDocumentLayout \brief The QAbstractTextDocumentLayout class is an abstract base class used to implement custom layouts for QTextDocuments. \ingroup text The standard layout provided by Qt can handle simple word processing including inline layouts, lists and tables. Some applications (e.g. a word processor or a DTP application) might need more features than the ones provided by Qt's layout engine, in which case you can subclass QAbstractTextDocumentLayout to provide your own custom layout behavior for your text documents. */ /*! \fn void QAbstractTextDocumentLayout::update(const QRectF &rect) This signal is emitted when the rectangle \a rect has been updated. */ /*! \fn void QAbstractTextDocumentLayout::documentSizeChanged(const QSizeF &newSize) This signal is emitted when the size of the document changes. The new size is specified by \a newSize. This information is useful to widgets that display text documents since it enables them to update their scroll bars correctly. \sa documentSize() */ /*! \fn void QAbstractTextDocumentLayout::pageCountChanged(int newPages) This signal is emitted when the number of pages in the layout changes; \a newPages is the updated page count. Changes to the page count are due to the changes to the layout or the document content itself. \sa pageCount() */ /*! \fn int QAbstractTextDocumentLayout::pageCount() const Returns the number of pages required by the layout. \sa pageCountChanged() */ /*! \fn QSizeF QAbstractTextDocumentLayout::documentSize() const Returns the total size of the document. This is useful to display widgets since they can use to information to update their scroll bars correctly \sa documentSizeChanged(), QTextDocument::pageSize */ /*! \fn void QAbstractTextDocumentLayout::draw(QPainter *painter, const PaintContext &context) Draws the layout on the given \a painter with the given \a context. */ /*! \fn int QAbstractTextDocumentLayout::hitTest(const QPointF &point, Qt::HitTestAccuracy accuracy) const Returns the cursor postion for the given \a point with the \a accuracy specified. Returns -1 to indicate failure if no valid cursor position was found. */ /*! \fn void QAbstractTextDocumentLayout::documentChanged(int position, int charsRemoved, int charsAdded) This function is called whenever the contents of the document change. A change occurs when text is inserted, removed, or a combination of the two types of operation. The change is specified by \a position, \a charsRemoved, and \a charsAdded corresponding to the starting character position of the change, the number of character removed from the document, and the number of characters added. For example, when inserting the text "Hello" into an empty document, \a charsRemoved would be 0 and \a charsAdded would be 5 (the length of the string). Replacing text is the combination of removal and insertion. For example, if the text "Hello" gets replaced by "Hi", \a charsRemoved would be 5 and \a charsAdded would be 2. */ /*! \class QAbstractTextDocumentLayout::PaintContext \brief The QAbstractTextDocumentLayout::PaintContext class is a convenience class defining the parameters of a painter context. A painter context is used when rendering custom layouts for QTextDocuments with the QAbstractTextDocumentLayout::draw() function, and is specified by a \l {cursorPosition}{cursor position}, a \l {palette}{default text color}, a \l clip rectangle and a collection of \l selections. \sa QAbstractTextDocumentLayout */ /*! \fn QAbstractTextDocumentLayout::PaintContext::PaintContext() \internal */ /*! \variable QAbstractTextDocumentLayout::PaintContext::cursorPosition \brief the position within the document, where the cursor line should be drawn. The default value is -1. */ /*! \variable QAbstractTextDocumentLayout::PaintContext::palette \brief the default color that is used for the text, when no color is specified in the text. The default value of this variable uses the application's default palette. */ /*! \variable QAbstractTextDocumentLayout::PaintContext::clip \brief a hint to the layout avoiding that paragraphs, frames or text that are clearly outside the specified rectangle, are drawn Specifying a clip rectangle can speed up drawing of large documents significantly. Note that the clip rectangle is in document coordinates (i.e., not in viewport coordinates), and that it is not a substitute for a clip region set on the painter. The default value is a null rectangle. */ /*! \variable QAbstractTextDocumentLayout::PaintContext::selections \brief the collection of selections that will be rendered when passing this painter context to QAbstractTextDocumentLayout's draw() function. The default value of this variable is an empty vector. */ /*! \class QAbstractTextDocumentLayout::Selection \brief The QAbstractTextDocumentLayout::Selection class is a convenience class defining the parameters of a selection. A selection can be used to specify a part of a document that should be rendere when drawing custom layouts for QTextDocuments with the QAbstractTextDocumentLayout::draw() function, and is specified by a \l cursor and a \l format. \sa QAbstractTextDocumentLayout, PaintContext */ /*! \variable QAbstractTextDocumentLayout::Selection::format \brief the format of the selection The default value is QTextFormat::InvalidFormat. */ /*! \variable QAbstractTextDocumentLayout::Selection::cursor \brief the selection's cursor The default value is a null cursor. */ /*! Creates a new text document layout for the given \a document. */ QAbstractTextDocumentLayout::QAbstractTextDocumentLayout(QTextDocument *document) : QObject(*new QAbstractTextDocumentLayoutPrivate, document) { } /*! \internal */ QAbstractTextDocumentLayout::QAbstractTextDocumentLayout(QAbstractTextDocumentLayoutPrivate &p, QTextDocument *document) :QObject(p, document) { } /*! \internal */ QAbstractTextDocumentLayout::~QAbstractTextDocumentLayout() { } /*! Registers the given \a component as a handler for items of the given \a formatType. */ void QAbstractTextDocumentLayout::registerHandler(int formatType, QObject *component) { Q_D(QAbstractTextDocumentLayout); QTextObjectInterface *iface = qobject_cast(component); if (!iface) return; // ### print error message on terminal? connect(component, SIGNAL(destroyed(QObject*)), this, SLOT(_q_handlerDestroyed(QObject*))); QTextObjectHandler h; h.iface = iface; h.component = component; d->handlers.insert(formatType, h); } /*! Returns a handler for objects of the given \a objectType. */ QTextObjectInterface *QAbstractTextDocumentLayout::handlerForObject(int objectType) const { Q_D(const QAbstractTextDocumentLayout); QTextObjectHandler handler = d->handlers.value(objectType); if (!handler.component) return 0; return handler.iface; } /*! Sets the size of the inline object \a item in accordance with the text \a format. \a posInDocument specifies the position of the object within the document. */ void QAbstractTextDocumentLayout::resizeInlineObject(QTextInlineObject item, int posInDocument, const QTextFormat &format) { Q_D(QAbstractTextDocumentLayout); QTextCharFormat f = format.toCharFormat(); Q_ASSERT(f.isValid()); QTextObjectHandler handler = d->handlers.value(f.objectType()); if (!handler.component) return; QSizeF s = handler.iface->intrinsicSize(document(), posInDocument, format); item.setWidth(s.width()); item.setAscent(s.height()); item.setDescent(0); } /*! Lays out the inline object \a item using the given text \a format. The base class implementation does nothing. \a posInDocument specifies the position of the object within the document. \sa drawInlineObject() */ void QAbstractTextDocumentLayout::positionInlineObject(QTextInlineObject item, int posInDocument, const QTextFormat &format) { Q_UNUSED(item); Q_UNUSED(posInDocument); Q_UNUSED(format); } /*! \fn void QAbstractTextDocumentLayout::drawInlineObject(QPainter *painter, const QRectF &rect, QTextInlineObject object, int posInDocument, const QTextFormat &format) Called to draw the inline object \a object on the given \a painter within the rectangle specified by \a rect using the text format specified by \a format. \a posInDocument specifies the position of the object within the document. \sa draw() */ void QAbstractTextDocumentLayout::drawInlineObject(QPainter *p, const QRectF &rect, QTextInlineObject item, int posInDocument, const QTextFormat &format) { Q_UNUSED(item); Q_D(QAbstractTextDocumentLayout); QTextCharFormat f = format.toCharFormat(); Q_ASSERT(f.isValid()); QTextObjectHandler handler = d->handlers.value(f.objectType()); if (!handler.component) return; handler.iface->drawObject(p, rect, document(), posInDocument, format); #if 0 if (selType == QTextLayout::Highlight && item.engine()->pal) { #if defined (Q_WS_WIN) static QPixmap tile; if (tile.isNull()) { QImage image(128, 128, 32); image.fill((item.engine()->pal->highlight().color().rgb() & 0x00ffffff) | 0x7f000000); image.setAlphaBuffer(true); tile = QPixmap(image); } p->drawTiledPixmap(rect, tile); #elif defined (Q_WS_MAC) QColor hl = item.engine()->pal->highlight().color(); QBrush brush(QColor(hl.red(), hl.green(), hl.blue(), 127)); QPixmap texture = item.engine()->pal->highlight().texture(); if(!texture.isNull()) brush.setTexture(texture); p->fillRect(rect, brush); #else QBrush brush(item.engine()->pal->highlight().color(), Qt::Dense4Pattern); p->fillRect(rect, brush); #endif } #endif } void QAbstractTextDocumentLayoutPrivate::_q_handlerDestroyed(QObject *obj) { HandlerHash::Iterator it = handlers.begin(); while (it != handlers.end()) if ((*it).component == obj) it = handlers.erase(it); else ++it; } /*! \internal Returns the index of the format at position \a pos. */ int QAbstractTextDocumentLayout::formatIndex(int pos) { QTextDocumentPrivate *pieceTable = qobject_cast(parent())->docHandle(); return pieceTable->find(pos).value()->format; } /*! \fn QTextCharFormat QAbstractTextDocumentLayout::format(int position) Returns the character format that is applicable at the given \a position. */ QTextCharFormat QAbstractTextDocumentLayout::format(int pos) { QTextDocumentPrivate *pieceTable = qobject_cast(parent())->docHandle(); int idx = pieceTable->find(pos).value()->format; return pieceTable->formatCollection()->charFormat(idx); } /*! Returns the text document that this layout is operating on. */ QTextDocument *QAbstractTextDocumentLayout::document() const { return qobject_cast(parent()); } /*! \fn QString QAbstractTextDocumentLayout::anchorAt(const QPointF &position) const Returns the reference of the anchor at the given \a position, or an empty string if no anchor exists at that point. */ QString QAbstractTextDocumentLayout::anchorAt(const QPointF& pos) const { int cursorPos = hitTest(pos, Qt::ExactHit); if (cursorPos == -1) return QString(); QTextDocumentPrivate *pieceTable = qobject_cast(parent())->docHandle(); QTextDocumentPrivate::FragmentIterator it = pieceTable->find(cursorPos); QTextCharFormat fmt = pieceTable->formatCollection()->charFormat(it->format); return fmt.anchorHref(); } /*! Returns the bounding rectacle of \a frame. \fn QRectF QAbstractTextDocumentLayout::frameBoundingRect(QTextFrame *frame) const Returns the bounding rectangle of \a frame. */ /*! \fn QRectF QAbstractTextDocumentLayout::blockBoundingRect(const QTextBlock &block) const Returns the bounding rectangle of \a block. */ /*! Sets the paint device used for rendering the document's layout to the given \a device. \sa paintDevice() */ void QAbstractTextDocumentLayout::setPaintDevice(QPaintDevice *device) { Q_D(QAbstractTextDocumentLayout); d->paintDevice = device; } /*! Returns the paint device used to render the document's layout. \sa setPaintDevice() */ QPaintDevice *QAbstractTextDocumentLayout::paintDevice() const { Q_D(const QAbstractTextDocumentLayout); return d->paintDevice; } #include "moc_qabstracttextdocumentlayout.cpp"