Method giveScrollEventForSubWidgets

dgl/src/WidgetPrivateData.cpp:183–217

}

bool Widget::PrivateData::giveScrollEventForSubWidgets(ScrollEvent& ev)
{
    if (! visible)
        return false;
    if (subWidgets.size() == 0)
        return false;

    const double x = ev.absolutePos.getX();
    const double y = ev.absolutePos.getY();

    if (SubWidget* const selfw = dynamic_cast<SubWidget*>(self))
    {
        if (selfw->pData->needsViewportScaling)
        {
            ev.absolutePos.setX(x - selfw->getAbsoluteX() + selfw->getMargin().getX());
            ev.absolutePos.setY(y - selfw->getAbsoluteY() + selfw->getMargin().getY());
        }
    }

    FOR_EACH_SUBWIDGET_INV(rit)
    {
        SubWidget* const widget(*rit);

        if (! widget->isVisible())
            continue;

        ev.pos = Point<double>(x - widget->getAbsoluteX() + widget->getMargin().getX(),
                               y - widget->getAbsoluteY() + widget->getMargin().getY());

        if (widget->onScroll(ev))
            return true;
    }

    return false;
}

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