GravityDelegate.java 文件源码

public int[] calculateDistanceToFinalSnap(@NonNull RecyclerView.LayoutManager layoutManager,
                                          @NonNull View targetView) {
    int[] out = new int[2];

    if (layoutManager.canScrollHorizontally()) {
        if (gravity == Gravity.START) {
            out[0] = distanceToStart(targetView, getHorizontalHelper(layoutManager), false);
        } else { // END
            out[0] = distanceToEnd(targetView, getHorizontalHelper(layoutManager), false);
        }
    } else {
        out[0] = 0;
    }

    if (layoutManager.canScrollVertically()) {
        if (gravity == Gravity.TOP) {
            out[1] = distanceToStart(targetView, getVerticalHelper(layoutManager), false);
        } else { // BOTTOM
            out[1] = distanceToEnd(targetView, getVerticalHelper(layoutManager), false);
        }
    } else {
        out[1] = 0;
    }

    return out;
}