render_text.cpp

konqueror3 embedded版本, KDE环境下的当家浏览器的嵌入式版本源码包.

int RenderText::inlineXPos() const
{
    return minXPos();
}

int RenderText::inlineYPos() const
{
    return m_lines.isEmpty() ? 0 : m_lines[0]->yPos();
}

const QFont &RenderText::font()
{
    return style()->font();
}

void RenderText::setText(DOMStringImpl *text, bool force)
{
    if( !force && str == text ) return;

    DOMStringImpl *oldstr = str;
    if(text && style())
        str = text->collapseWhiteSpace(style()->preserveLF(), style()->preserveWS());
    else
        str = text;
    if(str) str->ref();
    if(oldstr) oldstr->deref();

    if ( str && style() ) {
        oldstr = str;
        switch(style()->textTransform()) {
	case CAPITALIZE:   str = str->capitalize();  break;
	case UPPERCASE:   str = str->upper();       break;
	case LOWERCASE:  str = str->lower();       break;
	case NONE:
	default:;
	}
        str->ref();
        oldstr->deref();
    }

    // ### what should happen if we change the text of a
    // RenderBR object ?
    KHTMLAssert(!isBR() || (str->l == 1 && (*str->s) == '\n'));
    KHTMLAssert(!str->l || str->s);

    setNeedsLayoutAndMinMaxRecalc();
#ifdef BIDI_DEBUG
    QConstString cstr(str->s, str->l);
    kdDebug( 6040 ) << "RenderText::setText( " << cstr.string().length() << " ) '" << cstr.string() << "'" << endl;
#endif
}

int RenderText::height() const
{
    int retval;
    if ( m_lines.count() )
        retval = m_lines[m_lines.count()-1]->m_y + m_lineHeight - m_lines[0]->m_y;
    else
        retval = metrics( false ).height();

    return retval;
}

short RenderText::lineHeight( bool firstLine ) const
{
    if ( firstLine )
 	return RenderObject::lineHeight( firstLine );

    return m_lineHeight;
}

short RenderText::baselinePosition( bool firstLine ) const
{
    const QFontMetrics &fm = metrics( firstLine );
    return fm.ascent() +
        ( lineHeight( firstLine ) - fm.height() ) / 2;
}

InlineBox* RenderText::createInlineBox(bool, bool isRootLineBox)
{
    KHTMLAssert( !isRootLineBox );
    return new (renderArena()) InlineTextBox(this);
}

void RenderText::position(InlineBox* box, int from, int len, bool reverse)
{
//kdDebug(6040) << "position: from="<<from<<" len="<<len<<endl;
    // ### should not be needed!!!
    // asserts sometimes with pre (that unibw-hamburg testcase). ### find out why
    //KHTMLAssert(!(len == 0 || (str->l && len == 1 && *(str->s+from) == '\n') ));
    // It is now needed. BRs need text boxes too otherwise caret navigation
    // gets stuck (LS)
    // if (len == 0 || (str->l && len == 1 && *(str->s+from) == '\n') ) return;

    reverse = reverse && !style()->visuallyOrdered();

#ifdef DEBUG_LAYOUT
    QChar *ch = str->s+from;
    QConstString cstr(ch, len);
#endif

    KHTMLAssert(box->isInlineTextBox());
    InlineTextBox *s = static_cast<InlineTextBox *>(box);
    s->m_start = from;
    s->m_len = len;
    s->m_reversed = reverse;
    //kdDebug(6040) << "m_start: " << s->m_start << " m_len: " << s->m_len << endl;

    if(m_lines.count() == m_lines.size())
        m_lines.resize(m_lines.size()*2+1);

    m_lines.insert(m_lines.count(), s);
    //kdDebug(6040) << this << " " << renderName() << "::position inserted" << endl;
}

unsigned int RenderText::width(unsigned int from, unsigned int len, bool firstLine) const
{
    if(!str->s || from > str->l ) return 0;
    if ( from + len > str->l ) len = str->l - from;

    const Font *f = htmlFont( firstLine );
    return width( from, len, f );
}

unsigned int RenderText::width(unsigned int from, unsigned int len, const Font *f) const
{
    if(!str->s || from > str->l ) return 0;
    if ( from + len > str->l ) len = str->l - from;

    if ( f == &style()->htmlFont() && from == 0 && len == str->l )
 	 return m_maxWidth;

    int w = f->width(str->s, str->l, from, len );

    //kdDebug( 6040 ) << "RenderText::width(" << from << ", " << len << ") = " << w << endl;
    return w;
}

short RenderText::width() const
{
    int w;
    int minx = 100000000;
    int maxx = 0;
    // slooow
    for(unsigned int si = 0; si < m_lines.count(); si++) {
        InlineTextBox* s = m_lines[si];
        if(s->m_x < minx)
            minx = s->m_x;
        if(s->m_x + s->m_width > maxx)
            maxx = s->m_x + s->m_width;
    }

    w = kMax(0, maxx-minx);

    return w;
}

void RenderText::repaint(bool immediate)
{
    RenderObject *cb = containingBlock();
    if(cb)
        cb->repaint(immediate);
}

bool RenderText::isFixedWidthFont() const
{
    return QFontInfo(style()->font()).fixedPitch();
}

short RenderText::verticalPositionHint( bool firstLine ) const
{
    return parent()->verticalPositionHint( firstLine );
}

const QFontMetrics &RenderText::metrics(bool firstLine) const
{
    if( firstLine && hasFirstLine() ) {
	RenderStyle *pseudoStyle  = style()->getPseudoStyle(RenderStyle::FIRST_LINE);
	if ( pseudoStyle )
	    return pseudoStyle->fontMetrics();
    }
    return style()->fontMetrics();
}

const Font *RenderText::htmlFont(bool firstLine) const
{
    const Font *f = 0;
    if( firstLine && hasFirstLine() ) {
	RenderStyle *pseudoStyle  = style()->getPseudoStyle(RenderStyle::FIRST_LINE);
	if ( pseudoStyle )
	    f = &pseudoStyle->htmlFont();
    } else {
	f = &style()->htmlFont();
    }
    return f;
}

bool RenderText::containsOnlyWhitespace(unsigned int from, unsigned int len) const
{
    unsigned int currPos;
    for (currPos = from;
         currPos < from+len && (str->s[currPos] == '\n' || str->s[currPos].direction() == QChar::DirWS);
         currPos++);
    return currPos >= (from+len);
}

void RenderText::trimmedMinMaxWidth(short& beginMinW, bool& beginWS,
                                    short& endMinW, bool& endWS,
                                    bool& hasBreakableChar, bool& hasBreak,
                                    short& beginMaxW, short& endMaxW,
                                    short& minW, short& maxW, bool& stripFrontSpaces)
{
    bool preserveWS = style()->preserveWS();
    bool preserveLF = style()->preserveLF();
    bool autoWrap = style()->autoWrap();
    if (preserveWS)
        stripFrontSpaces = false;

    int len = str->l;
    if (len == 0 || (stripFrontSpaces && str->containsOnlyWhitespace())) {
        maxW = 0;
        hasBreak = false;
        return;
    }

    minW = m_minWidth;
    maxW = m_maxWidth;
    beginWS = stripFrontSpaces ? false : m_hasBeginWS;
    endWS = m_hasEndWS;

    beginMinW = m_beginMinWidth;
    endMinW = m_endMinWidth;

    hasBreakableChar = m_hasBreakableChar;
    hasBreak = m_hasBreak;

    if (stripFrontSpaces && (str->s[0].direction() == QChar::DirWS || (!preserveLF && str->s[0] == '\n'))) {
        const Font *f = htmlFont( false );
        QChar space[1]; space[0] = ' ';
        int spaceWidth = f->width(space, 1, 0);
        maxW -= spaceWidth;
    }

    stripFrontSpaces = !preserveWS && m_hasEndWS;

    if (!autoWrap)
        minW = maxW;
    else if (minW > maxW)
        minW = maxW;

    // Compute our max widths by scanning the string for newlines.
    if (hasBreak) {
        const Font *f = htmlFont( false );
        bool firstLine = true;
        beginMaxW = endMaxW = maxW;
        for(int i = 0; i < len; i++)
        {
            int linelen = 0;
            while( i+linelen < len && str->s[i+linelen] != '\n')
                linelen++;

            if (linelen)
            {
#ifndef APPLE_CHANGES
                endMaxW = f->width(str->s, str->l, i, linelen);
#else
                endMaxW = widthFromCache(f, i, linelen);
#endif
                if (firstLine) {
                    firstLine = false;
                    beginMaxW = endMaxW;
                }
                i += linelen;
            }
            else if (firstLine) {
                beginMaxW = 0;
                firstLine = false;
            }
	    if (i == len-1)
	        // A <pre> run that ends with a newline, as in, e.g.,
	        // <pre>Some text\n\n<span>More text</pre>
	        endMaxW = 0;
        }
    }
}

#ifdef ENABLE_DUMP

static QString quoteAndEscapeNonPrintables(const QString &s)
{
    QString result;
    result += '"';
    for (uint i = 0; i != s.length(); ++i) {
        QChar c = s.at(i);
        if (c == '\\') {
            result += "\\\\";
        } else if (c == '"') {
            result += "\\\"";
        } else {
            ushort u = c.unicode();
            if (u >= 0x20 && u < 0x7F) {
                result += c;
            } else {
                QString hex;
                hex.sprintf("\\x{%X}", u);
                result += hex;
            }
        }
    }
    result += '"';
    return result;
}

static void writeTextRun(QTextStream &ts, const RenderText &o, const InlineTextBox &run)
{
    ts << "text run at (" << run.m_x << "," << run.m_y << ") width " << run.m_width << ": "
       << quoteAndEscapeNonPrintables(o.data().string().mid(run.m_start, run.m_len));
}

void RenderText::dump(QTextStream &stream, const QString &ind) const
{
    RenderObject::dump( stream, ind );

    for (unsigned int i = 0; i < m_lines.count(); i++) {
        stream << endl << ind << "   ";
        writeTextRun(stream, *this, *m_lines[i]);
    }
}
#endif

RenderTextFragment::RenderTextFragment(DOM::NodeImpl* _node, DOM::DOMStringImpl* _str,
                                       int startOffset, int endOffset)
:RenderText(_node, _str->substring(startOffset, endOffset)),
m_start(startOffset), m_end(endOffset), m_generatedContentStr(0)
{}

RenderTextFragment::RenderTextFragment(DOM::NodeImpl* _node, DOM::DOMStringImpl* _str)
:RenderText(_node, _str), m_start(0)
{
    m_generatedContentStr = _str;
    if (_str) {
        _str->ref();
        m_end = _str->l;
    }
    else
        m_end = 0;
}

RenderTextFragment::~RenderTextFragment()
{
    if (m_generatedContentStr)
        m_generatedContentStr->deref();
}

bool RenderTextFragment::isTextFragment() const
{
    return true;
}

DOM::DOMStringImpl* RenderTextFragment::originalString() const
{
    DOM::DOMStringImpl* result = 0;
    if (element())
        result = element()->string();
    else
        result = contentString();
    if (result && (start() > 0 || start() < result->l))
        result = result->substring(start(), end());
    return result;
}

#undef BIDI_DEBUG
#undef DEBUG_LAYOUT