Function findSplitPositionForWord

core/ui/UIRichText.cpp:1941–1999

}

int findSplitPositionForWord(Label* label,
                             const StringUtils::StringUTF8& text,
                             int estimatedIdx,
                             float originalLeftSpaceWidth,
                             float newLineWidth)
{
    const bool startingNewLine = (newLineWidth == originalLeftSpaceWidth);
    if (!isWrappable(text))
        return (startingNewLine ? static_cast<int>(text.length()) : 0);

    // The adjustment of the new line position
    int idx             = getNextWordPos(text, estimatedIdx);
    std::string leftStr = text.getAsCharSequence(0, idx);
    label->setString(leftStr);
    float textRendererWidth = label->getContentSize().width;
    if (originalLeftSpaceWidth < textRendererWidth)  // Have protruding
    {
        while (1)
        {
            // try to erase a word
            int newidx = getPrevWordPos(text, idx);
            if (newidx >= 0)
            {
                leftStr = text.getAsCharSequence(0, newidx);
                label->setString(leftStr);
                textRendererWidth = label->getContentSize().width;
                if (textRendererWidth <= originalLeftSpaceWidth)  // is fitted
                    return newidx;
                idx = newidx;
                continue;
            }
            // newidx < 0 means no prev word
            return (startingNewLine ? idx : 0);
        }
    }
    else if (textRendererWidth < originalLeftSpaceWidth)  // A wide margin
    {
        while (1)
        {
            // try to append a word
            int newidx = getNextWordPos(text, idx);
            leftStr    = text.getAsCharSequence(0, newidx);
            label->setString(leftStr);
            textRendererWidth = label->getContentSize().width;
            if (textRendererWidth < originalLeftSpaceWidth)
            {
                // the whole string is tested
                if (newidx == static_cast<int>(text.length()))
                    return newidx;
                idx = newidx;
                continue;
            }
            // protruded ? undo add, or quite fit
            return (textRendererWidth > originalLeftSpaceWidth ? idx : newidx);
        }
    }

    return idx;