rendertextcontrol.cpp

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    return TextIterator::rangeLength(range.get());
}

void RenderTextControl::subtreeHasChanged()
{
    m_edited = true;
    m_userEdited = true;
}

String RenderTextControl::finishText(Vector<UChar>& result) const
{
    // Remove one trailing newline; there's always one that's collapsed out by rendering.
    size_t size = result.size();
    if (size && result[size - 1] == '\n')
        result.shrink(--size);

    // Convert backslash to currency symbol.
    document()->displayBufferModifiedByEncoding(result.data(), result.size());
    
    return String::adopt(result);
}

String RenderTextControl::text()
{
    if (!m_innerText)
        return "";
 
    Frame* frame = document()->frame();
    Text* compositionNode = frame ? frame->editor()->compositionNode() : 0;

    Vector<UChar> result;

    for (Node* n = m_innerText.get(); n; n = n->traverseNextNode(m_innerText.get())) {
        if (n->hasTagName(brTag))
            result.append(&newlineCharacter, 1);
        else if (n->isTextNode()) {
            Text* text = static_cast<Text*>(n);
            String data = text->data();
            unsigned length = data.length();
            if (text != compositionNode)
                result.append(data.characters(), length);
            else {
                unsigned compositionStart = min(frame->editor()->compositionStart(), length);
                unsigned compositionEnd = min(max(compositionStart, frame->editor()->compositionEnd()), length);
                result.append(data.characters(), compositionStart);
                result.append(data.characters() + compositionEnd, length - compositionEnd);
            }
        }
    }

    return finishText(result);
}

static void getNextSoftBreak(RootInlineBox*& line, Node*& breakNode, unsigned& breakOffset)
{
    RootInlineBox* next;
    for (; line; line = next) {
        next = line->nextRootBox();
        if (next && !line->endsWithBreak()) {
            ASSERT(line->lineBreakObj());
            breakNode = line->lineBreakObj()->node();
            breakOffset = line->lineBreakPos();
            line = next;
            return;
        }
    }
    breakNode = 0;
}

String RenderTextControl::textWithHardLineBreaks()
{
    if (!m_innerText)
        return "";
    Node* firstChild = m_innerText->firstChild();
    if (!firstChild)
        return "";

    document()->updateLayout();

    RenderObject* renderer = firstChild->renderer();
    if (!renderer)
        return "";

    InlineBox* box = renderer->isText() ? toRenderText(renderer)->firstTextBox() : toRenderBox(renderer)->inlineBoxWrapper();
    if (!box)
        return "";

    Frame* frame = document()->frame();
    Text* compositionNode = frame ? frame->editor()->compositionNode() : 0;

    Node* breakNode;
    unsigned breakOffset;
    RootInlineBox* line = box->root();
    getNextSoftBreak(line, breakNode, breakOffset);

    Vector<UChar> result;

    for (Node* n = firstChild; n; n = n->traverseNextNode(m_innerText.get())) {
        if (n->hasTagName(brTag))
            result.append(&newlineCharacter, 1);
        else if (n->isTextNode()) {
            Text* text = static_cast<Text*>(n);
            String data = text->data();
            unsigned length = data.length();
            unsigned compositionStart = (text == compositionNode)
                ? min(frame->editor()->compositionStart(), length) : 0;
            unsigned compositionEnd = (text == compositionNode)
                ? min(max(compositionStart, frame->editor()->compositionEnd()), length) : 0;
            unsigned position = 0;
            while (breakNode == n && breakOffset < compositionStart) {
                result.append(data.characters() + position, breakOffset - position);
                position = breakOffset;
                result.append(&newlineCharacter, 1);
                getNextSoftBreak(line, breakNode, breakOffset);
            }
            result.append(data.characters() + position, compositionStart - position);
            position = compositionEnd;
            while (breakNode == n && breakOffset <= length) {
                if (breakOffset > position) {
                    result.append(data.characters() + position, breakOffset - position);
                    position = breakOffset;
                    result.append(&newlineCharacter, 1);
                }
                getNextSoftBreak(line, breakNode, breakOffset);
            }
            result.append(data.characters() + position, length - position);
        }
        while (breakNode == n)
            getNextSoftBreak(line, breakNode, breakOffset);
    }

    return finishText(result);
}

int RenderTextControl::scrollbarThickness() const
{
    // FIXME: We should get the size of the scrollbar from the RenderTheme instead.
    return ScrollbarTheme::nativeTheme()->scrollbarThickness();
}

void RenderTextControl::calcHeight()
{
    setHeight(m_innerText->renderBox()->borderTop() + m_innerText->renderBox()->borderBottom() +
              m_innerText->renderBox()->paddingTop() + m_innerText->renderBox()->paddingBottom() +
              m_innerText->renderBox()->marginTop() + m_innerText->renderBox()->marginBottom());

    adjustControlHeightBasedOnLineHeight(m_innerText->renderer()->lineHeight(true, true));
    setHeight(height() + paddingTop() + paddingBottom() + borderTop() + borderBottom());

    // We are able to have a horizontal scrollbar if the overflow style is scroll, or if its auto and there's no word wrap.
    if (m_innerText->renderer()->style()->overflowX() == OSCROLL ||  (m_innerText->renderer()->style()->overflowX() == OAUTO && m_innerText->renderer()->style()->wordWrap() == NormalWordWrap))
        setHeight(height() + scrollbarThickness());

    RenderBlock::calcHeight();
}

void RenderTextControl::hitInnerTextBlock(HitTestResult& result, int xPos, int yPos, int tx, int ty)
{
    result.setInnerNode(m_innerText.get());
    result.setLocalPoint(IntPoint(xPos - tx - x() - m_innerText->renderBox()->x(),
                                  yPos - ty - y() - m_innerText->renderBox()->y()));
}

void RenderTextControl::forwardEvent(Event* event)
{
    if (event->type() == eventNames().blurEvent || event->type() == eventNames().focusEvent)
        return;
    m_innerText->defaultEventHandler(event);
}

IntRect RenderTextControl::controlClipRect(int tx, int ty) const
{
    IntRect clipRect = contentBoxRect();
    clipRect.move(tx, ty);
    return clipRect;
}

void RenderTextControl::calcPrefWidths()
{
    ASSERT(prefWidthsDirty());

    m_minPrefWidth = 0;
    m_maxPrefWidth = 0;

    if (style()->width().isFixed() && style()->width().value() > 0)
        m_minPrefWidth = m_maxPrefWidth = calcContentBoxWidth(style()->width().value());
    else {
        // Figure out how big a text control needs to be for a given number of characters
        // (using "0" as the nominal character).
        const UChar ch = '0';
        float charWidth = style()->font().floatWidth(TextRun(&ch, 1, false, 0, 0, false, false, false));
        m_maxPrefWidth = preferredContentWidth(charWidth) + m_innerText->renderBox()->paddingLeft() + m_innerText->renderBox()->paddingRight();
    }

    if (style()->minWidth().isFixed() && style()->minWidth().value() > 0) {
        m_maxPrefWidth = max(m_maxPrefWidth, calcContentBoxWidth(style()->minWidth().value()));
        m_minPrefWidth = max(m_minPrefWidth, calcContentBoxWidth(style()->minWidth().value()));
    } else if (style()->width().isPercent() || (style()->width().isAuto() && style()->height().isPercent()))
        m_minPrefWidth = 0;
    else
        m_minPrefWidth = m_maxPrefWidth;

    if (style()->maxWidth().isFixed() && style()->maxWidth().value() != undefinedLength) {
        m_maxPrefWidth = min(m_maxPrefWidth, calcContentBoxWidth(style()->maxWidth().value()));
        m_minPrefWidth = min(m_minPrefWidth, calcContentBoxWidth(style()->maxWidth().value()));
    }

    int toAdd = paddingLeft() + paddingRight() + borderLeft() + borderRight();

    m_minPrefWidth += toAdd;
    m_maxPrefWidth += toAdd;

    setPrefWidthsDirty(false);
}

void RenderTextControl::selectionChanged(bool userTriggered)
{
    cacheSelection(selectionStart(), selectionEnd());

    if (Frame* frame = document()->frame()) {
        if (frame->selection()->isRange() && userTriggered)
            node()->dispatchEventForType(eventNames().selectEvent, true, false);
    }
}

void RenderTextControl::addFocusRingRects(GraphicsContext* graphicsContext, int tx, int ty)
{
    graphicsContext->addFocusRingRect(IntRect(tx, ty, width(), height()));
}

void RenderTextControl::autoscroll()
{
    RenderLayer* layer = m_innerText->renderBox()->layer();
    if (layer)
        layer->autoscroll();
}

int RenderTextControl::scrollWidth() const
{
    if (m_innerText)
        return m_innerText->scrollWidth();
    return RenderBlock::scrollWidth();
}

int RenderTextControl::scrollHeight() const
{
    if (m_innerText)
        return m_innerText->scrollHeight();
    return RenderBlock::scrollHeight();
}

int RenderTextControl::scrollLeft() const
{
    if (m_innerText)
        return m_innerText->scrollLeft();
    return RenderBlock::scrollLeft();
}

int RenderTextControl::scrollTop() const
{
    if (m_innerText)
        return m_innerText->scrollTop();
    return RenderBlock::scrollTop();
}

void RenderTextControl::setScrollLeft(int newLeft)
{
    if (m_innerText)
        m_innerText->setScrollLeft(newLeft);
}

void RenderTextControl::setScrollTop(int newTop)
{
    if (m_innerText)
        m_innerText->setScrollTop(newTop);
}

bool RenderTextControl::scroll(ScrollDirection direction, ScrollGranularity granularity, float multiplier)
{
    RenderLayer* layer = m_innerText->renderBox()->layer();
    if (layer && layer->scroll(direction, granularity, multiplier))
        return true;
    return RenderBlock::scroll(direction, granularity, multiplier);
}

HTMLElement* RenderTextControl::innerTextElement() const
{
    return m_innerText.get();
}

FormControlElement* RenderTextControl::formControlElement() const
{
    return toFormControlElement(static_cast<Element*>(node()));
}

} // namespace WebCore