ParallaxLayerLayout.java 文件源码

@Size(2)
private float[] calculateFinalTranslationPx(View child, @Size(2) float[] translations) {
    LayoutParams lp = (LayoutParams) child.getLayoutParams();
    int xSign = translations[0] > 0 ? 1 : -1;
    int ySign = translations[1] > 0 ? 1 : -1;

    float translationX =
            xSign * lp.offsetPx * interpolator.getInterpolation(Math.abs(translations[0])) * scaleX;
    float translationY =
            ySign * lp.offsetPx * interpolator.getInterpolation(Math.abs(translations[1])) * scaleY;

    return new float[]{translationX, translationY};
}