render_text.cpp

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	sel->height = height();
	sel->area = 0;
	boxInfoList.append(sel);
}
#endif

#ifdef APPLE_CHANGES

bool RenderText::allAscii() const
{
    if (m_allAsciiChecked)
        return m_allAscii;
    m_allAsciiChecked = true;

    unsigned int i;
    for (i = 0; i < str->l; i++){
        if (str->s[i].unicode() >= 0x7f){
            m_allAscii = false;
            return m_allAscii;
        }
    }

    m_allAscii = true;

    return m_allAscii;
}

bool RenderText::shouldUseMonospaceCache(const Font *f) const
{
    return (f && f->isFixedPitch() && allAscii() && !style()->htmlFont().isSmallCaps());
}

// We cache the width of the ' ' character for <pre> text.  We could go futher
// and cache a widths array for all styles, at the expense of increasing the size of the
// RenderText.
void RenderText::cacheWidths()
{
    const Font *f = htmlFont( false );

    if (shouldUseMonospaceCache(f)){
        float fw;
        QChar c(' ');
        f->floatCharacterWidths( &c, 1, 0, 1, 0, &fw);
        m_monospaceCharacterWidth = (int)fw;
    }
    else
        m_monospaceCharacterWidth = 0;
}


inline int RenderText::widthFromCache(const Font *f, int start, int len) const
{
    if (m_monospaceCharacterWidth != 0){
        int i, w = 0;
        for (i = start; i < start+len; i++){
            int dir = str->s[i].direction();
            if (dir != QChar::DirNSM && dir != QChar::DirBN)
                w += m_monospaceCharacterWidth;
        }
        return w;
    }

    return f->width(str->s, str->l, start, len);
}
#ifdef XXX
inline int RenderText::widthFromCache(const Font *f, int start, int len) const
{
    if (m_monospaceCharacterWidth != 0){
        return len * m_monospaceCharacterWidth;
    }

    return f->width(str->s, str->l, start, len);
}
#endif

#endif

void RenderText::trimmedMinMaxWidth(int& beginMinW, bool& beginWS,
                                    int& endMinW, bool& endWS,
                                    bool& hasBreakableChar, bool& hasBreak,
                                    int& beginMaxW, int& endMaxW,
                                    int& minW, int& maxW, bool& stripFrontSpaces)
{
    bool isPre = style()->whiteSpace() == PRE;
    if (isPre)
        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] == ' ' || (!isPre && str->s[0] == '\n'))) {
        const Font *f = htmlFont( false );
        QChar space[1]; space[0] = ' ';
        int spaceWidth = f->width(space, 1, 0);
        maxW -= spaceWidth;
    }

    stripFrontSpaces = !isPre && m_hasEndWS;

    if (style()->whiteSpace() == NOWRAP)
        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)
            {
#if !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;
        }
    }
}

void RenderText::calcMinMaxWidth()
{
    KHTMLAssert( !minMaxKnown() );

    // ### calc Min and Max width...
    m_minWidth = m_beginMinWidth = m_endMinWidth = 0;
    m_maxWidth = 0;

    if (isBR())
        return;

    int currMinWidth = 0;
    int currMaxWidth = 0;
    m_hasBreakableChar = m_hasBreak = m_hasBeginWS = m_hasEndWS = false;

    // ### not 100% correct for first-line
    const Font *f = htmlFont( false );
    int wordSpacing = style()->wordSpacing();
    int len = str->l;
    bool ignoringSpaces = false;
    bool isSpace = false;
    bool isPre = style()->whiteSpace() == PRE;
    bool firstWord = true;
    bool firstLine = true;
    for(int i = 0; i < len; i++)
    {
        const QChar c = str->s[i];

        bool previousCharacterIsSpace = isSpace;

        bool isNewline = false;
        if (c == '\n') {
            if (isPre) {
                m_hasBreak = true;
                isNewline = true;
                isSpace = false;
            }
            else
                isSpace = true;
        } else {
            isSpace = c == ' ';
        }

        if ((isSpace || isNewline) && i == 0)
            m_hasBeginWS = true;
        if ((isSpace || isNewline) && i == len-1)
            m_hasEndWS = true;

        if (!ignoringSpaces && !isPre && previousCharacterIsSpace && isSpace)
            ignoringSpaces = true;

        if (ignoringSpaces && !isSpace)
            ignoringSpaces = false;

        if (ignoringSpaces || (i > 0 && c.unicode() == SOFT_HYPHEN)) // Ignore spaces and soft hyphens
            continue;

        int wordlen = 0;
        while (i+wordlen < len && str->s[i+wordlen] != '\n' && str->s[i+wordlen] != ' ' &&
               (i+wordlen == 0 || str->s[i+wordlen].unicode() != SOFT_HYPHEN) && // Skip soft hyphens
               (wordlen == 0 || !isBreakable( str->s, i+wordlen, str->l)))
            wordlen++;

        if (wordlen)
        {
#if !APPLE_CHANGES
            int w = f->width(str->s, str->l, i, wordlen);
#else
            int w = widthFromCache(f, i, wordlen);
#endif
            currMinWidth += w;
            currMaxWidth += w;

            bool isBreakableCharSpace = (i+wordlen < len) ? ((!isPre && str->s[i+wordlen] == '\n') ||
                                                             str->s[i+wordlen] == ' ') : false;

            if (i+wordlen < len && style()->whiteSpace() == NORMAL)
                m_hasBreakableChar = true;

            // Add in wordspacing to our maxwidth, but not if this is the last word on a line or the
            // last word in the run.
            if (wordSpacing && isBreakableCharSpace && !containsOnlyWhitespace(i+wordlen, len-(i+wordlen)))
                currMaxWidth += wordSpacing;

            if (firstWord) {
                firstWord = false;
                // If the first character in the run is breakable, then we consider ourselves to have a beginning
                // minimum width of 0, since a break could occur right before our run starts, preventing us from ever
                // being appended to a previous text run when considering the total minimum width of the containing block.
                bool hasBreak = isBreakable(str->s, i, str->l);
                if (hasBreak)
                    m_hasBreakableChar = true;
                m_beginMinWidth = hasBreak ? 0 : w;
            }
            m_endMinWidth = w;

            if (currMinWidth > m_minWidth) m_minWidth = currMinWidth;
            currMinWidth = 0;

            i += wordlen-1;
        }
        else {
            // Nowrap can never be broken, so don't bother setting the
            // breakable character boolean. Pre can only be broken if we encounter a newline.
            if (style()->whiteSpace() == NORMAL || isNewline)
                m_hasBreakableChar = true;

            if (currMinWidth > m_minWidth) m_minWidth = currMinWidth;
            currMinWidth = 0;

            if (isNewline) // Only set if isPre was true and we saw a newline.
            {
                if (firstLine) {
                    firstLine = false;
                    m_beginMinWidth = currMaxWidth;
                }

                if (currMaxWidth > m_maxWidth) m_maxWidth = currMaxWidth;
                currMaxWidth = 0;
            }
            else
            {
                currMaxWidth += f->width( str->s, str->l, i + wordlen );
            }
        }
    }

    if(currMinWidth > m_minWidth) m_minWidth = currMinWidth;
    if(currMaxWidth > m_maxWidth) m_maxWidth = currMaxWidth;

    if (style()->whiteSpace() != NORMAL)
        m_minWidth = m_maxWidth;

    if (isPre) {
        if (firstLine)
            m_beginMinWidth = m_maxWidth;
        m_endMinWidth = currMaxWidth;
    }

    setMinMaxKnown();
    //kdDebug( 6040 ) << "Text::calcMinMaxWidth(): min = " << m_minWidth << " max = " << m_maxWidth << endl;
}

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].unicode() == ' ');
         currPos++);
    return currPos >= (from+len);
}

int RenderText::minXPos() const
{
    if (!m_firstTextBox) return 0;
    int retval=6666666;
    for (InlineTextBox* box = firstTextBox(); box; box = box->nextTextBox())
	retval = kMin(retval, (int)box->m_x);
    return retval;
}

int RenderText::xPos() const
{
    return m_firstTextBox ? m_firstTextBox->m_x : 0;
}

int RenderText::yPos() const
{
    return m_firstTextBox ? m_firstTextBox->m_y : 0;
}

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

void RenderText::setSelectionState(SelectionState s)
{
    InlineTextBox* box;

    m_selectionState = s;
    if (s == SelectionStart || s == SelectionEnd || s == SelectionBoth) {
        int startPos, endPos;
        selectionStartEnd(startPos, endPos);
        if(selectionState() == SelectionStart) {
            endPos = str->l;

            // to handle selection from end of text to end of line
            if (startPos != 0 && startPos == endPos) {
                startPos = endPos - 1;
            }
        } else if(selectionState() == SelectionEnd)
            startPos = 0;

        for (box = firstTextBox(); box; box = box->nextTextBox()) {
            if (box->isSelected(startPos, endPos)) {
                RootInlineBox* line = box->root();
                if (line)
                    line->setHasSelectedChildren(true);
            }
        }
    }
    else {
        for (box = firstTextBox(); box; box = box->nextTextBox()) {
            RootInlineBox* line = box->root();
            if (line)
                line->setHasSelectedChildren(s == SelectionInside);
        }
    }

    containingBlock()->setSelectionState(s);
}

void RenderText::setTextWithOffset(DOMStringImpl *text, uint offset, uint len, bool force)
{
    uint oldLen = str ? str->l : 0;
    uint newLen = text ? text->l : 0;
    int delta = newLen - oldLen;
    uint end = len ? offset+len-1 : offset;

    RootInlineBox* firstRootBox = 0;