qabstracttextdocumentlayout.cpp

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#include <qabstracttextdocumentlayout.h>
#include <qtextformat.h>
#include "qtextdocument_p.h"
#include "qtextengine_p.h"

#include "qabstracttextdocumentlayout_p.h"

QT_BEGIN_NAMESPACE

QAbstractTextDocumentLayout::QAbstractTextDocumentLayout(QTextDocument *document)
    : QObject(*new QAbstractTextDocumentLayoutPrivate, document)
{
    Q_D(QAbstractTextDocumentLayout);
    d->setDocument(document);
}

QAbstractTextDocumentLayout::QAbstractTextDocumentLayout(QAbstractTextDocumentLayoutPrivate &p, QTextDocument *document)
    :QObject(p, document)
{
    Q_D(QAbstractTextDocumentLayout);
    d->setDocument(document);
}

QAbstractTextDocumentLayout::~QAbstractTextDocumentLayout()
{
}

void QAbstractTextDocumentLayout::registerHandler(int formatType, QObject *component)
{
    Q_D(QAbstractTextDocumentLayout);

    QTextObjectInterface *iface = qobject_cast<QTextObjectInterface *>(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);
}

QTextObjectInterface *QAbstractTextDocumentLayout::handlerForObject(int objectType) const
{
    Q_D(const QAbstractTextDocumentLayout);

    QTextObjectHandler handler = d->handlers.value(objectType);
    if (!handler.component)
        return 0;

    return handler.iface;
}

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() - 1);
    item.setDescent(0);
}

void QAbstractTextDocumentLayout::positionInlineObject(QTextInlineObject item, int posInDocument, const QTextFormat &format)
{
    Q_UNUSED(item);
    Q_UNUSED(posInDocument);
    Q_UNUSED(format);
}

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);
}

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;
}

int QAbstractTextDocumentLayout::formatIndex(int pos)
{
    QTextDocumentPrivate *pieceTable = qobject_cast<QTextDocument *>(parent())->docHandle();
    return pieceTable->find(pos).value()->format;
}

QTextCharFormat QAbstractTextDocumentLayout::format(int pos)
{
    QTextDocumentPrivate *pieceTable = qobject_cast<QTextDocument *>(parent())->docHandle();
    int idx = pieceTable->find(pos).value()->format;
    return pieceTable->formatCollection()->charFormat(idx);
}



QTextDocument *QAbstractTextDocumentLayout::document() const
{
    Q_D(const QAbstractTextDocumentLayout);
    return d->document;
}

QString QAbstractTextDocumentLayout::anchorAt(const QPointF& pos) const
{
    int cursorPos = hitTest(pos, Qt::ExactHit);
    if (cursorPos == -1)
        return QString();

    QTextDocumentPrivate *pieceTable = qobject_cast<const QTextDocument *>(parent())->docHandle();
    QTextDocumentPrivate::FragmentIterator it = pieceTable->find(cursorPos);
    QTextCharFormat fmt = pieceTable->formatCollection()->charFormat(it->format);
    return fmt.anchorHref();
}

void QAbstractTextDocumentLayout::setPaintDevice(QPaintDevice *device)
{
    Q_D(QAbstractTextDocumentLayout);
    d->paintDevice = device;
}

QPaintDevice *QAbstractTextDocumentLayout::paintDevice() const
{
    Q_D(const QAbstractTextDocumentLayout);
    return d->paintDevice;
}

QT_END_NAMESPACE

#include "moc_qabstracttextdocumentlayout.cpp"