Method interceptTouchEvent

core/ui/UIScrollView.cpp:1128–1188

}

void ScrollView::interceptTouchEvent(Widget::TouchEventType event, Widget* sender, Touch* touch)
{
    if (!_touchEnabled)
    {
        Layout::interceptTouchEvent(event, sender, touch);
        return;
    }
    if (_direction == Direction::NONE)
        return;
    Vec2 touchPoint = touch->getLocation();
    switch (event)
    {
    case TouchEventType::BEGAN:
    {
        _isInterceptTouch   = true;
        _touchBeganPosition = touch->getLocation();
        handlePressLogic(touch);
    }
    break;
    case TouchEventType::MOVED:
    {
        _touchMovePosition = touch->getLocation();
        // calculates move offset in points
        float offsetInInch = 0;
        switch (_direction)
        {
        case Direction::HORIZONTAL:
            offsetInInch =
                convertDistanceFromPointToInch(Vec2(std::abs(sender->getTouchBeganPosition().x - touchPoint.x), 0.0f));
            break;
        case Direction::VERTICAL:
            offsetInInch =
                convertDistanceFromPointToInch(Vec2(0.0f, std::abs(sender->getTouchBeganPosition().y - touchPoint.y)));
            break;
        case Direction::BOTH:
            offsetInInch = convertDistanceFromPointToInch(sender->getTouchBeganPosition() - touchPoint);
            break;
        default:
            break;
        }
        if (offsetInInch > _childFocusCancelOffsetInInch)
        {
            sender->setHighlighted(false);
            handleMoveLogic(touch);
        }
    }
    break;

    case TouchEventType::CANCELED:
    case TouchEventType::ENDED:
    {
        _touchEndPosition = touch->getLocation();
        handleReleaseLogic(touch);
        if (sender->isSwallowTouches())
        {
            _isInterceptTouch = false;
        }
    }