void Skin::render(const PushButton& button) const
{
    const auto& _pos = button.pos();
    const auto& _size = button.size();
    const Style style = button.getStyle();

    unsigned frame = static_cast<unsigned>(button.state());
    if(button.disabled()) {
        frame = 3;
    }
    drawButton(style, _pos, _size, frame);

    Pos w = _pos;
    w.x += _size.wid / 2.f;
    w.y += _size.hei / 2.f;

    if(button.state() == PushButton::State::Down) {
        w += Pos(1, 1);
    }

    if(button.disabled()) {
        glColor3f(0.6f, 0.6f, 0.6f);
    }

    float dx = 0.f;
    if(button._icon != -1) {
        /// @todo define json parameter for sep
        int sep = button._text.empty()?0:4;
        if(button._icon_policy == IconPolicy::GluedLeft) {
            dx = int( (_icons.getWidth(button._icon) + sep) / 2.f);
            _icons.draw(button._icon, 0,
                        int(w.x - button._text_width/2.f - dx),
                        int(w.y - _icons.getHeight(button._icon)/2.f));
        }
        else if(button._icon_policy == IconPolicy::GluedRight) {
            dx =  - int( (_icons.getWidth(button._icon) + sep) / 2.f);
            _icons.draw(button._icon, 0,
                        int(w.x + button._text_width/2.f + dx + sep),
                        int(w.y - _icons.getHeight(button._icon)/2.f));
        }
        /// @todo geometry update, etc ... (atm it's WIP / not finished)
        else if(button._icon_policy == IconPolicy::Left) {
            /// @todo define json parameter for '+ 8'
            _icons.draw(button._icon, 0,
                        int(_pos.x + 8),
                        int(w.y - _icons.getHeight(button._icon)/2.f));
        }
    }

    const auto& attribs = _attribs.at(style.skin);
    const auto& attr = attribs.button.at(style.style);

    drawSetColor(attr.text.color);
    _fonts[attr.text.font_index]->draw(w + Pos(dx, 0), button._text,
                                  Font::Middle, Font::Center);
    glColor3f(1, 1, 1);
}