QTextDocumentLayout Class Reference

#include <qtextdocumentlayout_p.h>

Inheritance diagram for QTextDocumentLayout:

Public Functions
virtual QRectF	blockBoundingRect (const QTextBlock &block) const
	Returns the bounding rectangle of block. More...
bool	contentHasAlignment () const
int	cursorWidth () const
QSizeF	documentSize () const
	Returns the total size of the document's layout. More...
void	draw (QPainter *painter, const PaintContext &context)
	Draws the layout with the given painter using the given context. More...
QSizeF	dynamicDocumentSize () const
int	dynamicPageCount () const
void	ensureLayouted (qreal)
virtual QRectF	frameBoundingRect (QTextFrame *frame) const
	Returns the bounding rectangle of frame. More...
int	hitTest (const QPointF &point, Qt::HitTestAccuracy accuracy) const
	Returns the cursor postion for the given point with the specified accuracy. More...
qreal	idealWidth () const
int	layoutStatus () const
int	pageCount () const
	Returns the number of pages contained in the layout. More...
	QTextDocumentLayout (QTextDocument *doc)
void	setCursorWidth (int width)
void	setFixedColumnWidth (int width)
void	setViewport (const QRectF &viewport)
Public Functions inherited from QAbstractTextDocumentLayout
QString	anchorAt (const QPointF &pos) const
	Returns the reference of the anchor the given position, or an empty string if no anchor exists at that point. More...
QTextDocument *	document () const
	Returns the text document that this layout is operating on. More...
QTextObjectInterface *	handlerForObject (int objectType) const
	Returns a handler for objects of the given objectType. More...
QPaintDevice *	paintDevice () const
	Returns the paint device used to render the document's layout. More...
	QAbstractTextDocumentLayout (QTextDocument *doc)
	Creates a new text document layout for the given document. More...
void	registerHandler (int objectType, QObject *component)
	Registers the given component as a handler for items of the given objectType. More...
void	setPaintDevice (QPaintDevice *device)
	Sets the paint device used for rendering the document's layout to the given device. More...
	~QAbstractTextDocumentLayout ()
Public Functions inherited from QObject
bool	blockSignals (bool b)
	If block is true, signals emitted by this object are blocked (i.e., emitting a signal will not invoke anything connected to it). More...
const QObjectList &	children () const
	Returns a list of child objects. More...
bool	connect (const QObject *sender, const char *signal, const char *member, Qt::ConnectionType type=Qt::AutoConnection) const
bool	disconnect (const char *signal=0, const QObject *receiver=0, const char *member=0)
bool	disconnect (const QObject *receiver, const char *member=0)
void	dumpObjectInfo ()
	Dumps information about signal connections, etc. More...
void	dumpObjectTree ()
	Dumps a tree of children to the debug output. More...
QList< QByteArray >	dynamicPropertyNames () const
	Returns the names of all properties that were dynamically added to the object using setProperty(). More...
virtual bool	event (QEvent *)
	This virtual function receives events to an object and should return true if the event e was recognized and processed. More...
virtual bool	eventFilter (QObject *, QEvent *)
	Filters events if this object has been installed as an event filter for the watched object. More...
template<typename T >
T	findChild (const QString &aName=QString()) const
	Returns the child of this object that can be cast into type T and that is called name, or 0 if there is no such object. More...
template<typename T >
QList< T >	findChildren (const QString &aName=QString()) const
	Returns all children of this object with the given name that can be cast to type T, or an empty list if there are no such objects. More...
template<typename T >
QList< T >	findChildren (const QRegExp &re) const
bool	inherits (const char *classname) const
	Returns true if this object is an instance of a class that inherits className or a QObject subclass that inherits className; otherwise returns false. More...
void	installEventFilter (QObject *)
	Installs an event filter filterObj on this object. More...
bool	isWidgetType () const
	Returns true if the object is a widget; otherwise returns false. More...
void	killTimer (int id)
	Kills the timer with timer identifier, id. More...
virtual const QMetaObject *	metaObject () const
	Returns a pointer to the meta-object of this object. More...
void	moveToThread (QThread *thread)
	Changes the thread affinity for this object and its children. More...
QString	objectName () const
QObject *	parent () const
	Returns a pointer to the parent object. More...
QVariant	property (const char *name) const
	Returns the value of the object's name property. More...
Q_INVOKABLE	QObject (QObject *parent=0)
	Constructs an object with parent object parent. More...
void	removeEventFilter (QObject *)
	Removes an event filter object obj from this object. More...
void	setObjectName (const QString &name)
void	setParent (QObject *)
	Makes the object a child of parent. More...
bool	setProperty (const char *name, const QVariant &value)
	Sets the value of the object's name property to value. More...
void	setUserData (uint id, QObjectUserData *data)
bool	signalsBlocked () const
	Returns true if signals are blocked; otherwise returns false. More...
int	startTimer (int interval)
	Starts a timer and returns a timer identifier, or returns zero if it could not start a timer. More...
QThread *	thread () const
	Returns the thread in which the object lives. More...
QObjectUserData *	userData (uint id) const
virtual	~QObject ()
	Destroys the object, deleting all its child objects. More...

Protected Functions
void	documentChanged (int from, int oldLength, int length)
	This function is called whenever the contents of the document change. More...
void	drawInlineObject (QPainter *p, const QRectF &rect, QTextInlineObject item, int posInDocument, const QTextFormat &format)
	This function is called to draw the inline object, object, with the given painter within the rectangle specified by rect using the specified text format. More...
void	positionInlineObject (QTextInlineObject item, int posInDocument, const QTextFormat &format)
	Lays out the inline object item using the given text format. More...
void	resizeInlineObject (QTextInlineObject item, int posInDocument, const QTextFormat &format)
	Sets the size of the inline object item corresponding to the text format. More...
virtual void	timerEvent (QTimerEvent *e)
	This event handler can be reimplemented in a subclass to receive timer events for the object. More...
Protected Functions inherited from QAbstractTextDocumentLayout
QTextCharFormat	format (int pos)
	Returns the character format that is applicable at the given position. More...
int	formatIndex (int pos)
	Returns the index of the format at position pos. More...
	QAbstractTextDocumentLayout (QAbstractTextDocumentLayoutPrivate &, QTextDocument *)
Protected Functions inherited from QObject
virtual void	childEvent (QChildEvent *)
	This event handler can be reimplemented in a subclass to receive child events. More...
virtual void	connectNotify (const char *signal)
	This virtual function is called when something has been connected to signal in this object. More...
virtual void	customEvent (QEvent *)
	This event handler can be reimplemented in a subclass to receive custom events. More...
virtual void	disconnectNotify (const char *signal)
	This virtual function is called when something has been disconnected from signal in this object. More...
	QObject (QObjectPrivate &dd, QObject *parent=0)
int	receivers (const char *signal) const
	Returns the number of receivers connected to the signal. More...
QObject *	sender () const
	Returns a pointer to the object that sent the signal, if called in a slot activated by a signal; otherwise it returns 0. More...
int	senderSignalIndex () const

Private Functions
QRectF	doLayout (int from, int oldLength, int length)
void	layoutFinished ()

Properties
bool	contentHasAlignment
int	cursorWidth
qreal	idealWidth

Additional Inherited Members
Public Slots inherited from QObject
void	deleteLater ()
	Schedules this object for deletion. More...
Signals inherited from QAbstractTextDocumentLayout
void	documentSizeChanged (const QSizeF &newSize)
	This signal is emitted when the size of the document layout changes to newSize. More...
void	pageCountChanged (int newPages)
	This signal is emitted when the number of pages in the layout changes; newPages is the updated page count. More...
void	update (const QRectF &=QRectF(0., 0., 1000000000., 1000000000.))
	This signal is emitted when the rectangle rect has been updated. More...
void	updateBlock (const QTextBlock &block)
	This signal is emitted when the specified block has been updated. More...
Signals inherited from QObject
void	destroyed (QObject *=0)
	This signal is emitted immediately before the object obj is destroyed, and can not be blocked. More...
Static Public Functions inherited from QObject
static bool	connect (const QObject *sender, const char *signal, const QObject *receiver, const char *member, Qt::ConnectionType=Qt::AutoConnection)
	Creates a connection of the given type from the signal in the sender object to the method in the receiver object. More...
static bool	connect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &method, Qt::ConnectionType type=Qt::AutoConnection)
static bool	disconnect (const QObject *sender, const char *signal, const QObject *receiver, const char *member)
	Disconnects signal in object sender from method in object receiver. More...
static bool	disconnect (const QObject *sender, const QMetaMethod &signal, const QObject *receiver, const QMetaMethod &member)
static uint	registerUserData ()
static QString	tr (const char *sourceText, const char *comment=0, int n=-1)
static QString	trUtf8 (const char *sourceText, const char *comment=0, int n=-1)
Static Public Variables inherited from QObject
static const QMetaObject	staticMetaObject
	This variable stores the meta-object for the class. More...
Protected Variables inherited from QObject
QScopedPointer< QObjectData >	d_ptr
Static Protected Variables inherited from QObject
static const QMetaObject	staticQtMetaObject
Related Functions inherited from QObject
T	qFindChildqFindChildren (const QObject *obj, const QString &name)()
QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QString &name)()
QList< T >	qFindChildrenqFindChildren (const QObject *obj, const QRegExp &regExp)()
T *	qobject_cast (QObject *object)
	QObjectList
void *	qt_find_obj_child (QObject *parent, const char *type, const QString &name)
	Returns a pointer to the object named name that inherits type and with a given parent. More...

Detailed Description

Definition at line 66 of file qtextdocumentlayout_p.h.

Constructors and Destructors

QTextDocumentLayout()

QTextDocumentLayout::QTextDocumentLayout ( QTextDocument *  doc )

explicit

Definition at line 2806 of file qtextdocumentlayout.cpp.

    : QAbstractTextDocumentLayout(*new QTextDocumentLayoutPrivate, doc)
{
    registerHandler(QTextFormat::ImageObject, new QTextImageHandler(this));
}

Functions

blockBoundingRect()

QRectF QTextDocumentLayout::blockBoundingRect ( const QTextBlock &  block ) const

virtual

Returns the bounding rectangle of block.

Implements QAbstractTextDocumentLayout.

Definition at line 3181 of file qtextdocumentlayout.cpp.

{
    Q_D(const QTextDocumentLayout);
    if (d->docPrivate->pageSize.isNull() || !block.isValid())
        return QRectF();
    d->ensureLayoutedByPosition(block.position() + block.length());
    QTextFrame *frame = d->document->frameAt(block.position());
    QPointF offset;
    const int blockPos = block.position();

    while (frame) {
        QTextFrameData *fd = data(frame);
        offset += fd->position.toPointF();

        if (QTextTable *table = qobject_cast<QTextTable *>(frame)) {
            QTextTableCell cell = table->cellAt(blockPos);
            if (cell.isValid())
                offset += static_cast<QTextTableData *>(fd)->cellPosition(cell).toPointF();
        }

        frame = frame->parentFrame();
    }

    const QTextLayout *layout = block.layout();
    QRectF rect = layout->boundingRect();
    rect.moveTopLeft(layout->position() + offset);
    return rect;
}

contentHasAlignment()

bool QTextDocumentLayout::contentHasAlignment

(

)

const

Referenced by ensureLayouted().

cursorWidth()

int QTextDocumentLayout::cursorWidth

(

)

const

Referenced by setCursorWidth().

documentChanged()

void QTextDocumentLayout::documentChanged ( int  position, int  charsRemoved, int  charsAdded  )

protectedvirtual

This function is called whenever the contents of the document change.

A change occurs when text is inserted, removed, or a combination of these two. The change is specified by position, charsRemoved, and charsAdded corresponding to the starting character position of the change, the number of characters removed from the document, and the number of characters added.

For example, when inserting the text "Hello" into an empty document, charsRemoved would be 0 and charsAdded would be 5 (the length of the string).

Replacing text is a combination of removing and inserting. For example, if the text "Hello" gets replaced by "Hi", charsRemoved would be 5 and charsAdded would be 2.

For subclasses of QAbstractTextDocumentLayout, this is the central function where a large portion of the work to lay out and position document contents is done.

For example, in a subclass that only arranges blocks of text, an implementation of this function would have to do the following:

• Determine the list of changed QTextBlock(s) using the parameters provided.
• Each QTextBlock object's corresponding QTextLayout object needs to be processed. You can access the QTextBlock's layout using the QTextBlock::layout() function. This processing should take the document's page size into consideration.
• If the total number of pages changed, the pageCountChanged() signal should be emitted.
• If the total size changed, the documentSizeChanged() signal should be emitted.
• The update() signal should be emitted to schedule a repaint of areas in the layout that require repainting.

See also

QTextLayout

Implements QAbstractTextDocumentLayout.

Definition at line 2873 of file qtextdocumentlayout.cpp.

{
    Q_D(QTextDocumentLayout);

    QTextBlock blockIt = document()->findBlock(from);
    QTextBlock endIt = document()->findBlock(qMax(0, from + length - 1));
    if (endIt.isValid())
        endIt = endIt.next();
     for (; blockIt.isValid() && blockIt != endIt; blockIt = blockIt.next())
         blockIt.clearLayout();

    if (d->docPrivate->pageSize.isNull())
        return;

    QRectF updateRect;

    d->lazyLayoutStepSize = 1000;
    d->sizeChangedTimer.stop();
    d->insideDocumentChange = true;

    const int documentLength = d->docPrivate->length();
    const bool fullLayout = (oldLength == 0 && length == documentLength);
    const bool smallChange = documentLength > 0
                             && (qMax(length, oldLength) * 100 / documentLength) < 5;

    // don't show incremental layout progress (avoid scroll bar flicker)
    // if we see only a small change in the document and we're either starting
    // a layout run or we're already in progress for that and we haven't seen
    // any bigger change previously (showLayoutProgress already false)
    if (smallChange
        && (d->currentLazyLayoutPosition == -1 || d->showLayoutProgress == false))
        d->showLayoutProgress = false;
    else
        d->showLayoutProgress = true;

    if (fullLayout) {
        d->contentHasAlignment = false;
        d->currentLazyLayoutPosition = 0;
        d->checkPoints.clear();
        d->layoutStep();
    } else {
        d->ensureLayoutedByPosition(from);
        updateRect = doLayout(from, oldLength, length);
    }

    if (!d->layoutTimer.isActive() && d->currentLazyLayoutPosition != -1)
        d->layoutTimer.start(10, this);

    d->insideDocumentChange = false;

    if (d->showLayoutProgress) {
        const QSizeF newSize = dynamicDocumentSize();
        if (newSize != d->lastReportedSize) {
            d->lastReportedSize = newSize;
            emit documentSizeChanged(newSize);
        }
    }

    if (!updateRect.isValid()) {
        // don't use the frame size, it might have shrunken
        updateRect = QRectF(QPointF(0, 0), QSizeF(qreal(INT_MAX), qreal(INT_MAX)));
    }

    emit update(updateRect);
}

documentSize()

QSizeF QTextDocumentLayout::documentSize ( ) const

virtual

Returns the total size of the document's layout.

This information can be used by display widgets to update their scroll bars correctly.

See also

documentSizeChanged(), QTextDocument::pageSize

Implements QAbstractTextDocumentLayout.

Definition at line 3093 of file qtextdocumentlayout.cpp.

{
    Q_D(const QTextDocumentLayout);
    d->ensureLayoutFinished();
    return dynamicDocumentSize();
}

doLayout()

QRectF QTextDocumentLayout::doLayout ( int  from, int  oldLength, int  length  )

private

Definition at line 2939 of file qtextdocumentlayout.cpp.

Referenced by documentChanged(), and QTextDocumentLayoutPrivate::ensureLayoutedByPosition().

{
    Q_D(QTextDocumentLayout);

//     qDebug("documentChange: from=%d, oldLength=%d, length=%d", from, oldLength, length);

    // mark all frames between f_start and f_end as dirty
    markFrames(d->docPrivate->rootFrame(), from, oldLength, length);

    QRectF updateRect;

    QTextFrame *root = d->docPrivate->rootFrame();
    if(data(root)->sizeDirty)
        updateRect = d->layoutFrame(root, from, from + length);
    data(root)->layoutDirty = false;

    if (d->currentLazyLayoutPosition == -1)
        layoutFinished();
    else if (d->showLayoutProgress)
        d->sizeChangedTimer.start(0, this);

    return updateRect;
}

draw()

void QTextDocumentLayout::draw ( QPainter *  painter, const PaintContext &  context  )

virtual

Draws the layout with the given painter using the given context.

Implements QAbstractTextDocumentLayout.

Definition at line 2813 of file qtextdocumentlayout.cpp.

{
    Q_D(QTextDocumentLayout);
    QTextFrame *frame = d->document->rootFrame();
    QTextFrameData *fd = data(frame);

    if(fd->sizeDirty)
        return;

    if (context.clip.isValid()) {
        d->ensureLayouted(QFixed::fromReal(context.clip.bottom()));
    } else {
        d->ensureLayoutFinished();
    }

    QFixed width = fd->size.width;
    if (d->document->pageSize().width() == 0 && d->viewportRect.isValid()) {
        // we're in NoWrap mode, meaning the frame should expand to the viewport
        // so that backgrounds are drawn correctly
        fd->size.width = qMax(width, QFixed::fromReal(d->viewportRect.right()));
    }

    // Make sure we conform to the root frames bounds when drawing.
    d->clipRect = QRectF(fd->position.toPointF(), fd->size.toSizeF()).adjusted(fd->leftMargin.toReal(), 0, -fd->rightMargin.toReal(), 0);
    d->drawFrame(QPointF(), painter, context, frame);
    fd->size.width = width;
}

drawInlineObject()

void QTextDocumentLayout::drawInlineObject ( QPainter *  painter, const QRectF &  rect, QTextInlineObject  object, int  posInDocument, const QTextFormat &  format  )

protectedvirtual

This function is called to draw the inline object, object, with the given painter within the rectangle specified by rect using the specified text format.

posInDocument specifies the position of the object within the document.

The default implementation calls drawObject() on the object handlers. This function is called only within Qt. Subclasses can reimplement this function to customize the drawing of inline objects.

See also

draw()

Reimplemented from QAbstractTextDocumentLayout.

Definition at line 3057 of file qtextdocumentlayout.cpp.

{
    Q_D(QTextDocumentLayout);
    QTextCharFormat f = format.toCharFormat();
    Q_ASSERT(f.isValid());
    QTextFrame *frame = qobject_cast<QTextFrame *>(d->document->objectForFormat(f));
    if (frame && frame->frameFormat().position() != QTextFrameFormat::InFlow)
        return; // don't draw floating frames from inline objects here but in drawFlow instead

//    qDebug() << "drawObject at" << r;
    QAbstractTextDocumentLayout::drawInlineObject(p, rect, item, posInDocument, format);
}

dynamicDocumentSize()

QSizeF QTextDocumentLayout::dynamicDocumentSize

(

)

const

Definition at line 3080 of file qtextdocumentlayout.cpp.

Referenced by documentChanged(), documentSize(), dynamicPageCount(), QTextEditPrivate::relayoutDocument(), and timerEvent().

{
    Q_D(const QTextDocumentLayout);
    return data(d->docPrivate->rootFrame())->size.toSizeF();
}

dynamicPageCount()

int QTextDocumentLayout::dynamicPageCount

(

)

const

Definition at line 3071 of file qtextdocumentlayout.cpp.

Referenced by pageCount(), and timerEvent().

{
    Q_D(const QTextDocumentLayout);
    const QSizeF pgSize = d->document->pageSize();
    if (pgSize.height() < 0)
        return 1;
    return qCeil(dynamicDocumentSize().height() / pgSize.height());
}

ensureLayouted()

void QTextDocumentLayout::ensureLayouted

(

qreal

y

)

Definition at line 3252 of file qtextdocumentlayout.cpp.

Referenced by QTextEditPrivate::relayoutDocument().

{
    d_func()->ensureLayouted(QFixed::fromReal(y));
}

frameBoundingRect()

QRectF QTextDocumentLayout::frameBoundingRect ( QTextFrame *  frame ) const

virtual

Returns the bounding rectangle of frame.

Implements QAbstractTextDocumentLayout.

Definition at line 3152 of file qtextdocumentlayout.cpp.

{
    Q_D(const QTextDocumentLayout);
    if (d->docPrivate->pageSize.isNull())
        return QRectF();
    d->ensureLayoutFinished();
    return d->frameBoundingRectInternal(frame);
}

hitTest()

int QTextDocumentLayout::hitTest ( const QPointF &  point, Qt::HitTestAccuracy  accuracy  ) const

virtual

Returns the cursor postion for the given point with the specified accuracy.

Returns -1 if no valid cursor position was found.

Implements QAbstractTextDocumentLayout.

Definition at line 2963 of file qtextdocumentlayout.cpp.

{
    Q_D(const QTextDocumentLayout);
    d->ensureLayouted(QFixed::fromReal(point.y()));
    QTextFrame *f = d->docPrivate->rootFrame();
    int position = 0;
    QTextLayout *l = 0;
    QFixedPoint pointf;
    pointf.x = QFixed::fromReal(point.x());
    pointf.y = QFixed::fromReal(point.y());
    QTextDocumentLayoutPrivate::HitPoint p = d->hitTest(f, pointf, &position, &l, accuracy);
    if (accuracy == Qt::ExactHit && p < QTextDocumentLayoutPrivate::PointExact)
        return -1;

    // ensure we stay within document bounds
    int lastPos = f->lastPosition();
    if (l && !l->preeditAreaText().isEmpty())
        lastPos += l->preeditAreaText().length();
    if (position > lastPos)
        position = lastPos;
    else if (position < 0)
        position = 0;

    return position;
}

idealWidth()

qreal QTextDocumentLayout::idealWidth

(

)

const

Referenced by ensureLayouted().

layoutFinished()

void QTextDocumentLayout::layoutFinished ( )

private

Definition at line 3242 of file qtextdocumentlayout.cpp.

Referenced by doLayout().

{
    Q_D(QTextDocumentLayout);
    d->layoutTimer.stop();
    if (!d->insideDocumentChange)
        d->sizeChangedTimer.start(0, this);
    // reset
    d->showLayoutProgress = true;
}

layoutStatus()

int QTextDocumentLayout::layoutStatus

(

)

const

Definition at line 3210 of file qtextdocumentlayout.cpp.

{
    Q_D(const QTextDocumentLayout);
    int pos = d->currentLazyLayoutPosition;
    if (pos == -1)
        return 100;
    return pos * 100 / d->document->docHandle()->length();
}

pageCount()

int QTextDocumentLayout::pageCount ( ) const

virtual

Returns the number of pages contained in the layout.

See also

pageCountChanged()

Implements QAbstractTextDocumentLayout.

Definition at line 3086 of file qtextdocumentlayout.cpp.

{
    Q_D(const QTextDocumentLayout);
    d->ensureLayoutFinished();
    return dynamicPageCount();
}

positionInlineObject()

void QTextDocumentLayout::positionInlineObject ( QTextInlineObject  item, int  posInDocument, const QTextFormat &  format  )

protectedvirtual

Lays out the inline object item using the given text format.

posInDocument specifies the position of the object within the document.

The default implementation does nothing. This function is called only within Qt. Subclasses can reimplement this function to customize the position of inline objects.

See also

drawInlineObject()

Reimplemented from QAbstractTextDocumentLayout.

Definition at line 3030 of file qtextdocumentlayout.cpp.

{
    Q_D(QTextDocumentLayout);
    Q_UNUSED(posInDocument);
    if (item.width() != 0)
        // inline
        return;

    QTextCharFormat f = format.toCharFormat();
    Q_ASSERT(f.isValid());
    QTextObjectHandler handler = d->handlers.value(f.objectType());
    if (!handler.component)
        return;

    QTextFrame *frame = qobject_cast<QTextFrame *>(d->document->objectForFormat(f));
    if (!frame)
        return;

    QTextBlock b = d->document->findBlock(frame->firstPosition());
    QTextLine line;
    if (b.position() <= frame->firstPosition() && b.position() + b.length() > frame->lastPosition())
        line = b.layout()->lineAt(b.layout()->lineCount()-1);
//     qDebug() << "layoutObject: line.isValid" << line.isValid() << b.position() << b.length() <<
//         frame->firstPosition() << frame->lastPosition();
    d->positionFloat(frame, line.isValid() ? &line : 0);
}

resizeInlineObject()

void QTextDocumentLayout::resizeInlineObject ( QTextInlineObject  item, int  posInDocument, const QTextFormat &  format  )

protectedvirtual

Sets the size of the inline object item corresponding to the text format.

posInDocument specifies the position of the object within the document.

The default implementation resizes the item to the size returned by the object handler's intrinsicSize() function. This function is called only within Qt. Subclasses can reimplement this function to customize the resizing of inline objects.

Reimplemented from QAbstractTextDocumentLayout.

Definition at line 2989 of file qtextdocumentlayout.cpp.

{
    Q_D(QTextDocumentLayout);
    QTextCharFormat f = format.toCharFormat();
    Q_ASSERT(f.isValid());
    QTextObjectHandler handler = d->handlers.value(f.objectType());
    if (!handler.component)
        return;

    QSizeF intrinsic = handler.iface->intrinsicSize(d->document, posInDocument, format);

    QTextFrameFormat::Position pos = QTextFrameFormat::InFlow;
    QTextFrame *frame = qobject_cast<QTextFrame *>(d->document->objectForFormat(f));
    if (frame) {
        pos = frame->frameFormat().position();
        QTextFrameData *fd = data(frame);
        fd->sizeDirty = false;
        fd->size = QFixedSize::fromSizeF(intrinsic);
        fd->minimumWidth = fd->maximumWidth = fd->size.width;
    }

    QSizeF inlineSize = (pos == QTextFrameFormat::InFlow ? intrinsic : QSizeF(0, 0));
    item.setWidth(inlineSize.width());

    QFontMetrics m(f.font());
    switch (f.verticalAlignment())
    {
    case QTextCharFormat::AlignMiddle:
        item.setDescent(inlineSize.height() / 2);
        item.setAscent(inlineSize.height() / 2 - 1);
        break;
    case QTextCharFormat::AlignBaseline:
        item.setDescent(m.descent());
        item.setAscent(inlineSize.height() - m.descent() - 1);
        break;
    default:
        item.setDescent(0);
        item.setAscent(inlineSize.height() - 1);
    }
}

setCursorWidth()

void QTextDocumentLayout::setCursorWidth

(

int

width

)

Definition at line 3134 of file qtextdocumentlayout.cpp.

{
    Q_D(QTextDocumentLayout);
    d->cursorWidth = width;
}

setFixedColumnWidth()

void QTextDocumentLayout::setFixedColumnWidth

(

int

width

)

Definition at line 3146 of file qtextdocumentlayout.cpp.

{
    Q_D(QTextDocumentLayout);
    d->fixedColumnWidth = width;
}

setViewport()

void QTextDocumentLayout::setViewport

(

const QRectF &

viewport

)

Definition at line 2841 of file qtextdocumentlayout.cpp.

Referenced by QTextEditPrivate::paint(), and QGraphicsTextItem::paint().

{
    Q_D(QTextDocumentLayout);
    d->viewportRect = viewport;
}

timerEvent()

void QTextDocumentLayout::timerEvent ( QTimerEvent *  event )

protectedvirtual

This event handler can be reimplemented in a subclass to receive timer events for the object.

QTimer provides a higher-level interface to the timer functionality, and also more general information about timers. The timer event is passed in the event parameter.

See also

startTimer(), killTimer(), event()

Reimplemented from QObject.

Definition at line 3219 of file qtextdocumentlayout.cpp.

{
    Q_D(QTextDocumentLayout);
    if (e->timerId() == d->layoutTimer.timerId()) {
        if (d->currentLazyLayoutPosition != -1)
            d->layoutStep();
    } else if (e->timerId() == d->sizeChangedTimer.timerId()) {
        d->lastReportedSize = dynamicDocumentSize();
        emit documentSizeChanged(d->lastReportedSize);
        d->sizeChangedTimer.stop();

        if (d->currentLazyLayoutPosition == -1) {
            const int newCount = dynamicPageCount();
            if (newCount != d->lastPageCount) {
                d->lastPageCount = newCount;
                emit pageCountChanged(newCount);
            }
        }
    } else {
        QAbstractTextDocumentLayout::timerEvent(e);
    }
}

Properties

contentHasAlignment

bool QTextDocumentLayout::contentHasAlignment

private

Definition at line 72 of file qtextdocumentlayout_p.h.

cursorWidth

int QTextDocumentLayout::cursorWidth

private

Definition at line 70 of file qtextdocumentlayout_p.h.

idealWidth

qreal QTextDocumentLayout::idealWidth

private

Definition at line 71 of file qtextdocumentlayout_p.h.

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The documentation for this class was generated from the following files:

• /src/gui/text/qtextdocumentlayout_p.h
• /src/gui/text/qtextdocumentlayout.cpp