q3richtext.cpp

奇趣公司比较新的qt/emd版本

}

Q3TextCursor *Q3TextStyleCommand::execute(Q3TextCursor *c)
{
    writeStyleInformation(doc, firstParag, after);
    return c;
}

Q3TextCursor *Q3TextStyleCommand::unexecute(Q3TextCursor *c)
{
    writeStyleInformation(doc, firstParag, before);
    return c;
}

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

Q3TextCursor::Q3TextCursor(Q3TextDocument *dc)
    : idx(0), tmpX(-1), ox(0), oy(0),
      valid(true)
{
    para = dc ? dc->firstParagraph() : 0;
}

Q3TextCursor::Q3TextCursor(const Q3TextCursor &c)
{
    ox = c.ox;
    oy = c.oy;
    idx = c.idx;
    para = c.para;
    tmpX = c.tmpX;
    indices = c.indices;
    paras = c.paras;
    xOffsets = c.xOffsets;
    yOffsets = c.yOffsets;
    valid = c.valid;
}

Q3TextCursor::~Q3TextCursor()
{
}

Q3TextCursor &Q3TextCursor::operator=(const Q3TextCursor &c)
{
    ox = c.ox;
    oy = c.oy;
    idx = c.idx;
    para = c.para;
    tmpX = c.tmpX;
    indices = c.indices;
    paras = c.paras;
    xOffsets = c.xOffsets;
    yOffsets = c.yOffsets;
    valid = c.valid;

    return *this;
}

bool Q3TextCursor::operator==(const Q3TextCursor &c) const
{
    return para == c.para && idx == c.idx;
}

int Q3TextCursor::totalOffsetX() const
{
    int xoff = ox;
    for (QStack<int>::ConstIterator xit = xOffsets.begin(); xit != xOffsets.end(); ++xit)
        xoff += *xit;
    return xoff;
}

int Q3TextCursor::totalOffsetY() const
{
    int yoff = oy;
    for (QStack<int>::ConstIterator yit = yOffsets.begin(); yit != yOffsets.end(); ++yit)
        yoff += *yit;
    return yoff;
}

#ifndef QT_NO_TEXTCUSTOMITEM
void Q3TextCursor::gotoIntoNested(const QPoint &globalPos)
{
    if (!para)
        return;
    Q_ASSERT(para->at(idx)->isCustom());
    push();
    ox = 0;
    int bl, y;
    para->lineHeightOfChar(idx, &bl, &y);
    oy = y + para->rect().y();
    ox = para->at(idx)->x;
    Q3TextDocument* doc = document();
    para->at(idx)->customItem()->enterAt(this, doc, para, idx, ox, oy, globalPos-QPoint(ox,oy));
}
#endif

void Q3TextCursor::invalidateNested()
{
    if (nestedDepth()) {
        QStack<Q3TextParagraph*>::Iterator it = paras.begin();
        QStack<int>::Iterator it2 = indices.begin();
        for (; it != paras.end(); ++it, ++it2) {
            if (*it == para)
                continue;
            (*it)->invalidate(0);
#ifndef QT_NO_TEXTCUSTOMITEM
            if ((*it)->at(*it2)->isCustom())
                (*it)->at(*it2)->customItem()->invalidate();
#endif
        }
    }
}

void Q3TextCursor::insert(const QString &str, bool checkNewLine, QVector<Q3TextStringChar> *formatting)
{
    tmpX = -1;
    bool justInsert = true;
    QString s(str);
#if defined(Q_WS_WIN)
    if (checkNewLine) {
        int i = 0;
        while ((i = s.indexOf(QLatin1Char('\r'), i)) != -1)
            s.remove(i ,1);
    }
#endif
    if (checkNewLine)
        justInsert = s.indexOf(QLatin1Char('\n')) == -1;
    if (justInsert) { // we ignore new lines and insert all in the current para at the current index
        para->insert(idx, s.unicode(), s.length());
        if (formatting) {
            for (int i = 0; i < (int)s.length(); ++i) {
                if (formatting->at(i).format()) {
                    formatting->at(i).format()->addRef();
                    para->string()->setFormat(idx + i, formatting->at(i).format(), true);
                }
            }
        }
        idx += s.length();
    } else { // we split at new lines
        int start = -1;
        int end;
        int y = para->rect().y() + para->rect().height();
        int lastIndex = 0;
        do {
            end = s.indexOf(QLatin1Char('\n'), start + 1); // find line break
            if (end == -1) // didn't find one, so end of line is end of string
                end = s.length();
            int len = (start == -1 ? end : end - start - 1);
            if (len > 0) // insert the line
                para->insert(idx, s.unicode() + start + 1, len);
            else
                para->invalidate(0);
            if (formatting) { // set formats to the chars of the line
                for (int i = 0; i < len; ++i) {
                    if (formatting->at(i + lastIndex).format()) {
                        formatting->at(i + lastIndex).format()->addRef();
                        para->string()->setFormat(i + idx, formatting->at(i + lastIndex).format(), true);
                    }
                }
                lastIndex += len;
            }
            start = end; // next start is at the end of this line
            idx += len; // increase the index of the cursor to the end of the inserted text
            if (s[end] == QLatin1Char('\n')) { // if at the end was a line break, break the line
                splitAndInsertEmptyParagraph(false, true);
                para->setEndState(-1);
                para->prev()->format(-1, false);
                lastIndex++;
            }

        } while (end < (int)s.length());

        para->format(-1, false);
        int dy = para->rect().y() + para->rect().height() - y;
        Q3TextParagraph *p = para;
        p->setParagId(p->prev() ? p->prev()->paragId() + 1 : 0);
        p = p->next();
        while (p) {
            p->setParagId(p->prev()->paragId() + 1);
            p->move(dy);
            p->invalidate(0);
            p->setEndState(-1);
            p = p->next();
        }
    }

    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;

    fixCursorPosition();
}

void Q3TextCursor::gotoLeft()
{
    if (para->string()->isRightToLeft())
        gotoNextLetter();
    else
        gotoPreviousLetter();
}

void Q3TextCursor::gotoPreviousLetter()
{
    tmpX = -1;

    if (idx > 0) {
        idx = para->string()->previousCursorPosition(idx);
#ifndef QT_NO_TEXTCUSTOMITEM
        const Q3TextStringChar *tsc = para->at(idx);
        if (tsc && tsc->isCustom() && tsc->customItem()->isNested())
            processNesting(EnterEnd);
#endif
    } else if (para->prev()) {
        para = para->prev();
        while (!para->isVisible() && para->prev())
            para = para->prev();
        idx = para->length() - 1;
    } else if (nestedDepth()) {
        pop();
        processNesting(Prev);
        if (idx == -1) {
            pop();
            if (idx > 0) {
                idx = para->string()->previousCursorPosition(idx);
#ifndef QT_NO_TEXTCUSTOMITEM
                const Q3TextStringChar *tsc = para->at(idx);
                if (tsc && tsc->isCustom() && tsc->customItem()->isNested())
                    processNesting(EnterEnd);
#endif
            } else if (para->prev()) {
                para = para->prev();
                idx = para->length() - 1;
            }
        }
    }
}

void Q3TextCursor::push()
{
    indices.push(idx);
    paras.push(para);
    xOffsets.push(ox);
    yOffsets.push(oy);
}

void Q3TextCursor::pop()
{
    if (indices.isEmpty())
        return;
    idx = indices.pop();
    para = paras.pop();
    ox = xOffsets.pop();
    oy = yOffsets.pop();
}

void Q3TextCursor::restoreState()
{
    while (!indices.isEmpty())
        pop();
}

bool Q3TextCursor::place(const QPoint &p, Q3TextParagraph *s, bool link)
{
    QPoint pos(p);
    QRect r;
    Q3TextParagraph *str = s;
    if (pos.y() < s->rect().y()) {
        pos.setY(s->rect().y());
#ifdef Q_WS_MAC
        pos.setX(s->rect().x());
#endif
    }
    while (s) {
        r = s->rect();
        r.setWidth(document() ? document()->width() : QWIDGETSIZE_MAX);
        if (s->isVisible())
            str = s;
        if (pos.y() >= r.y() && pos.y() <= r.y() + r.height())
            break;
        if (!s->next()) {
#ifdef Q_WS_MAC
            pos.setX(s->rect().x() + s->rect().width());
#endif
            break;
        }
        s = s->next();
    }

    if (!s || !str)
        return false;

    s = str;

    setParagraph(s);
    int y = s->rect().y();
    int lines = s->lines();
    Q3TextStringChar *chr = 0;
    int index = 0;
    int i = 0;
    int cy = 0;
    int ch = 0;
    for (; i < lines; ++i) {
        chr = s->lineStartOfLine(i, &index);
        cy = s->lineY(i);
        ch = s->lineHeight(i);
        if (!chr)
            return false;
        if (pos.y() <= y + cy + ch)
            break;
    }
    int nextLine;
    if (i < lines - 1)
        s->lineStartOfLine(i+1, &nextLine);
    else
        nextLine = s->length();
    i = index;
    int x = s->rect().x();
    if (pos.x() < x)
        pos.setX(x + 1);
    int cw;
    int curpos = s->length()-1;
    int dist = 10000000;
    bool inCustom = false;
    while (i < nextLine) {
        chr = s->at(i);
        int cpos = x + chr->x;
        cw = s->string()->width(i);
#ifndef QT_NO_TEXTCUSTOMITEM
        if (chr->isCustom() && chr->customItem()->isNested()) {
            if (pos.x() >= cpos && pos.x() <= cpos + cw &&
                 pos.y() >= y + cy && pos.y() <= y + cy + chr->height()) {
                inCustom = true;
                curpos = i;
                break;
            }
        } else
#endif
        {
            if(chr->rightToLeft)
                cpos += cw;
            int diff = cpos - pos.x();
            bool dm = diff < 0 ? !chr->rightToLeft : chr->rightToLeft;
            if ((QABS(diff) < dist || (dist == diff && dm == true)) && para->string()->validCursorPosition(i)) {
                dist = QABS(diff);
                if (!link || pos.x() >= x + chr->x)
                    curpos = i;
            }
        }
        i++;
    }
    setIndex(curpos);

#ifndef QT_NO_TEXTCUSTOMITEM
    if (inCustom && para->document() && para->at(curpos)->isCustom() && para->at(curpos)->customItem()->isNested()) {
        Q3TextDocument *oldDoc = para->document();
        gotoIntoNested(pos);
        if (oldDoc == para->document())
            return true;
        QPoint p(pos.x() - offsetX(), pos.y() - offsetY());
        if (!place(p, document()->firstParagraph(), link))
            pop();
    }
#endif
    return true;
}

bool Q3TextCursor::processNesting(Operation op)
{
    if (!para->document())
        return false;
    Q3TextDocument* doc = para->document();
    push();
    ox = para->at(idx)->x;
    int bl, y;
    para->lineHeightOfChar(idx, &bl, &y);
    oy = y + para->rect().y();
    bool ok = false;

#ifndef QT_NO_TEXTCUSTOMITEM
    switch (op) {
    case EnterBegin:
        ok = para->at(idx)->customItem()->enter(this, doc, para, idx, ox, oy);
        break;
    case EnterEnd:
        ok = para->at(idx)->customItem()->enter(this, doc, para, idx, ox, oy, true);
        break;
    case Next:
        ok = para->at(idx)->customItem()->next(this, doc, para, idx, ox, oy);
        break;
    case Prev:
        ok = para->at(idx)->customItem()->prev(this, doc, para, idx, ox, oy);
        break;
    case Down:
        ok = para->at(idx)->customItem()->down(this, doc, para, idx, ox, oy);
        break;
    case Up:
        ok = para->at(idx)->customItem()->up(this, doc, para, idx, ox, oy);
        break;
    }
    if (!ok)
#endif
        pop();