react-native-scroll-into-view/build/computeScrollY.js

React-Native port of DOMElement.scrollIntoView() web function, for ScrollView

export const computeScrollY = (scrollViewLayout, viewLayout, scrollY, insets, align) => {
    const scrollViewHeight = scrollViewLayout.height;
    const childHeight = viewLayout.height;
    // layout measures are relative to window, so we make them relative to ScrollView instead
    const viewTopY = viewLayout.y - scrollViewLayout.y;
    const viewBottomY = viewTopY + childHeight;
    const computationData = {
        scrollViewHeight,
        scrollY,
        viewTopY,
        viewBottomY,
        insets,
    };
    switch (align) {
        case 'auto':
            return computeScrollYAuto(computationData);
        case 'top':
            return computeScrollYTop(computationData);
        case 'bottom':
            return computeScrollYBottom(computationData);
        case 'center':
            return computeScrollYCenter(computationData);
        default:
            throw new Error(`align=${align} not supported`);
    }
};
export const computeScrollYAuto = (data) => {
    const { scrollY } = data;
    const scrollYTop = computeScrollYTop(data);
    if (scrollY > scrollYTop) {
        return scrollYTop;
    }
    const scrollYBottom = computeScrollYBottom(data);
    if (scrollY < scrollYBottom) {
        return scrollYBottom;
    }
    return scrollY;
};
export const computeScrollYTop = ({ scrollViewHeight, scrollY, viewTopY, insets, }) => {
    return scrollY + viewTopY - insets.top;
};
export const computeScrollYBottom = ({ scrollViewHeight, scrollY, viewTopY, viewBottomY, insets, }) => {
    return scrollY + viewBottomY - scrollViewHeight + insets.bottom;
};
export const computeScrollYCenter = (data) => {
    return (computeScrollYTop(data) + computeScrollYBottom(data)) / 2;
};
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