q3richtext.cpp

奇趣公司比较新的qt/emd版本

            para = s;
            idx = 0;
        }
    }

    invalidateNested();
}

bool Q3TextCursor::remove()
{
    tmpX = -1;
    if (!atParagEnd()) {
        int next = para->string()->nextCursorPosition(idx);
        para->remove(idx, next-idx);
        int h = para->rect().height();
        para->format(-1, true);
        if (h != para->rect().height())
            invalidateNested();
        else if (para->document() && para->document()->parent())
            para->document()->nextDoubleBuffered = true;
        return false;
    } else if (para->next()) {
        para->join(para->next());
        invalidateNested();
        return true;
    }
    return false;
}

/* needed to implement backspace the correct way */
bool Q3TextCursor::removePreviousChar()
{
    tmpX = -1;
    if (!atParagStart()) {
        para->remove(idx-1, 1);
        int h = para->rect().height();
        idx--;
        // shouldn't be needed, just to make sure.
        fixCursorPosition();
        para->format(-1, true);
        if (h != para->rect().height())
            invalidateNested();
        else if (para->document() && para->document()->parent())
            para->document()->nextDoubleBuffered = true;
        return false;
    } else if (para->prev()) {
        para = para->prev();
        para->join(para->next());
        invalidateNested();
        return true;
    }
    return false;
}

void Q3TextCursor::indent()
{
    int oi = 0, ni = 0;
    para->indent(&oi, &ni);
    if (oi == ni)
        return;

    if (idx >= oi)
        idx += ni - oi;
    else
        idx = ni;
}

void Q3TextCursor::fixCursorPosition()
{
    // searches for the closest valid cursor position
    if (para->string()->validCursorPosition(idx))
        return;

    int lineIdx;
    Q3TextStringChar *start = para->lineStartOfChar(idx, &lineIdx, 0);
    int x = para->string()->at(idx).x;
    int diff = QABS(start->x - x);
    int best = lineIdx;

    Q3TextStringChar *c = start;
    ++c;

    Q3TextStringChar *end = &para->string()->at(para->length()-1);
    while (c <= end && !c->lineStart) {
        int xp = c->x;
        if (c->rightToLeft)
            xp += para->string()->width(lineIdx + (c-start));
        int ndiff = QABS(xp - x);
        if (ndiff < diff && para->string()->validCursorPosition(lineIdx + (c-start))) {
            diff = ndiff;
            best = lineIdx + (c-start);
        }
        ++c;
    }
    idx = best;
}


// +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

Q3TextDocument::Q3TextDocument(Q3TextDocument *p)
    : par(p), parentPar(0)
#ifndef QT_NO_TEXTCUSTOMITEM
    , tc(0)
#endif
    , tArray(0), tStopWidth(0)
{
    fCollection = par ? par->fCollection : new Q3TextFormatCollection;
    init();
}

void Q3TextDocument::init()
{
    oTextValid = true;
    mightHaveCustomItems = false;
    if (par)
        par->insertChild(this);
    pProcessor = 0;
    useFC = true;
    pFormatter = 0;
    indenter = 0;
    fParag = 0;
    txtFormat = Qt::AutoText;
    preferRichText = false;
    pages = false;
    focusIndicator.parag = 0;
    minw = 0;
    wused = 0;
    minwParag = curParag = 0;
    align = Qt::AlignAuto;
    nSelections = 1;

    setStyleSheet(Q3StyleSheet::defaultSheet());
#ifndef QT_NO_MIME
    factory_ = Q3MimeSourceFactory::defaultFactory();
#endif
    contxt.clear();

    underlLinks = par ? par->underlLinks : true;
    backBrush = 0;
    buf_pixmap = 0;
    nextDoubleBuffered = false;

    if (par)
        withoutDoubleBuffer = par->withoutDoubleBuffer;
    else
        withoutDoubleBuffer = false;

    lParag = fParag = createParagraph(this, 0, 0);

    cx = 0;
    cy = 2;
    if (par)
        cx = cy = 0;
    cw = 600;
    vw = 0;
    flow_ = new Q3TextFlow;
    flow_->setWidth(cw);

    leftmargin = rightmargin = 4;
    scaleFontsFactor = 1;

    commandHistory = new Q3TextCommandHistory(100);
    tStopWidth = formatCollection()->defaultFormat()->width(QLatin1Char('x')) * 8;
}

Q3TextDocument::~Q3TextDocument()
{
    delete commandHistory;
    if (par)
        par->removeChild(this);
    clear();
    delete flow_;
    if (!par) {
        delete pFormatter;
        delete fCollection;
    }
    delete pProcessor;
    delete buf_pixmap;
    delete indenter;
    delete backBrush;
    delete [] tArray;
}

void Q3TextDocument::clear(bool createEmptyParag)
{
    while (fParag) {
        Q3TextParagraph *p = fParag->next();
        delete fParag;
        fParag = p;
    }
    if (flow_)
        flow_->clear();
    fParag = lParag = 0;
    if (createEmptyParag)
        fParag = lParag = createParagraph(this);
    selections.clear();
    oText.clear();
    oTextValid = false;
}

int Q3TextDocument::widthUsed() const
{
    return wused + 2*border_tolerance;
}

int Q3TextDocument::height() const
{
    int h = 0;
    if (lParag)
        h = lParag->rect().top() + lParag->rect().height() + 1;
    int fh = flow_->boundingRect().bottom();
    return qMax(h, fh);
}



Q3TextParagraph *Q3TextDocument::createParagraph(Q3TextDocument *dc, Q3TextParagraph *pr, Q3TextParagraph *nx, bool updateIds)
{
    return new Q3TextParagraph(dc, pr, nx, updateIds);
}

bool Q3TextDocument::setMinimumWidth(int needed, int used, Q3TextParagraph *p)
{
    if (needed == -1) {
        minw = 0;
        wused = 0;
        p = 0;
    }
    if (p == minwParag) {
        if (minw > needed) {
            Q3TextParagraph *tp = fParag;
            while (tp) {
                if (tp != p && tp->minwidth > needed) {
                    needed = tp->minwidth;
                    minwParag = tp;
                }
                tp = tp->n;
            }
        }
        minw = needed;
        emit minimumWidthChanged(minw);
    } else if (needed > minw) {
        minw = needed;
        minwParag = p;
        emit minimumWidthChanged(minw);
    }
    wused = qMax(wused, used);
    wused = qMax(wused, minw);
    cw = qMax(minw, cw);
    return true;
}

void Q3TextDocument::setPlainText(const QString &text)
{
    preferRichText = false;
    clear();
    oTextValid = true;
    oText = text;

    int lastNl = 0;
    int nl = text.indexOf(QLatin1Char('\n'));
    if (nl == -1) {
        lParag = createParagraph(this, lParag, 0);
        if (!fParag)
            fParag = lParag;
        QString s = text;
        if (!s.isEmpty()) {
            if (s[(int)s.length() - 1] == QLatin1Char('\r'))
                s.remove(s.length() - 1, 1);
            lParag->append(s);
        }
    } else {
        for (;;) {
            lParag = createParagraph(this, lParag, 0);
            if (!fParag)
                fParag = lParag;
            int l = nl - lastNl;
            if (l > 0) {
                if (text.unicode()[nl-1] == QLatin1Char('\r'))
                    l--;
                QString cs = QString::fromRawData(text.unicode()+lastNl, l);
                lParag->append(cs);
            }
            if (nl == (int)text.length())
                break;
            lastNl = nl + 1;
            nl = text.indexOf(QLatin1Char('\n'), nl + 1);
            if (nl == -1)
                nl = text.length();
        }
    }
    if (!lParag)
        lParag = fParag = createParagraph(this, 0, 0);
}

struct Q3TextDocumentTag {
    Q3TextDocumentTag(){}
    Q3TextDocumentTag(const QString&n, const Q3StyleSheetItem* s, const Q3TextFormat& f)
        :name(n),style(s), format(f), alignment(Qt::AlignAuto), direction(QChar::DirON),liststyle(Q3StyleSheetItem::ListDisc) {
            wsm = Q3StyleSheetItem::WhiteSpaceNormal;
    }
    QString name;
    const Q3StyleSheetItem* style;
    QString anchorHref;
    Q3StyleSheetItem::WhiteSpaceMode wsm;
    Q3TextFormat format;
    signed int alignment : 16;
    signed int direction : 5;
    Q3StyleSheetItem::ListStyle liststyle;

    Q3TextDocumentTag( const Q3TextDocumentTag& t) {
        name = t.name;
        style = t.style;
        anchorHref = t.anchorHref;
        wsm = t.wsm;
        format = t.format;
        alignment = t.alignment;
        direction = t.direction;
        liststyle = t.liststyle;
    }
    Q3TextDocumentTag& operator=(const Q3TextDocumentTag& t) {
        name = t.name;
        style = t.style;
        anchorHref = t.anchorHref;
        wsm = t.wsm;
        format = t.format;
        alignment = t.alignment;
        direction = t.direction;
        liststyle = t.liststyle;
        return *this;
    }

    Q_DUMMY_COMPARISON_OPERATOR(Q3TextDocumentTag)
};


#define NEWPAR \
    do{ \
        if (!hasNewPar) { \
            if (!textEditMode && curpar && curpar->length()>1 \
                 && curpar->at(curpar->length()-2)->c == QChar::LineSeparator) \
                curpar->remove(curpar->length()-2, 1); \
            curpar = createParagraph(this, curpar, curpar->next()); \
            styles.append(vec); \
            vec = 0; \
        } \
        hasNewPar = true; \
        curpar->rtext = true;  \
        curpar->align = curtag.alignment; \
        curpar->lstyle = curtag.liststyle; \
        curpar->litem = (curtag.style->displayMode() == Q3StyleSheetItem::DisplayListItem); \
        curpar->str->setDirection((QChar::Direction)curtag.direction); \
        space = true; \
        tabExpansionColumn = 0; \
        delete vec; \
        vec = new QVector<Q3StyleSheetItem *>(); \
        for (QStack<Q3TextDocumentTag>::Iterator it = tags.begin(); it != tags.end(); ++it) \
            vec->append(const_cast<Q3StyleSheetItem *>((*it).style)); \
        vec->append(const_cast<Q3StyleSheetItem *>(curtag.style)); \
    } while(false);


void Q3TextDocument::setRichText(const QString &text, const QString &context, const Q3TextFormat *initialFormat)
{
    preferRichText = true;
    if (!context.isEmpty())
        setContext(context);
    clear();
    fParag = lParag = createParagraph(this);
    oTextValid = true;
    oText = text;
    setRichTextInternal(text, 0, initialFormat);
    fParag->rtext = true;
}

void Q3TextDocument::setRichTextInternal(const QString &text, Q3TextCursor* cursor, const Q3TextFormat *initialFormat)
{
    Q3TextParagraph* curpar = lParag;
    int pos = 0;
    QStack<Q3TextDocumentTag> tags;
    if (!initialFormat)
        initialFormat = formatCollection()->defaultFormat();
    Q3TextDocumentTag initag(QLatin1String(""), sheet_->item(QLatin1String("")), *initialFormat);
    if (bodyText.isValid())
        initag.format.setColor(bodyText);
    Q3TextDocumentTag curtag = initag;
    bool space = true;
    bool canMergeLi = false;

    bool textEditMode = false;
    int tabExpansionColumn = 0;

    const QChar* doc = text.unicode();
    int length = text.length();
    bool hasNewPar = curpar->length() <= 1;
    QString anchorName;

    // style sheet handling for margin and line spacing calculation below
    Q3TextParagraph* stylesPar = curpar;
    QVector<Q3StyleSheetItem *>* vec = 0;
    QList< QVector<Q3StyleSheetItem *> *> styles;

    if (cursor) {