nikhilpanju

/**
 * Called when fab is clicked to open filter sheet (open = true)
 * or called when closeIcon is clicked to close the filter sheet (open = false)
 *
 * It's a 3 step animation played in sequence. Read the comments to know more.
 */
private fun openFilterSheet(open: Boolean) {

    // 1) Fab Arc Path Animator
    // Animates path of the fab from starting position to centre of screen

nikhilpanju

class NoScrollRecyclerView @JvmOverloads constructor(context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0)
    : RecyclerView(context, attrs, defStyleAttr) {

    override fun scrollBy(x: Int, y: Int) {
        val lm = layoutManager as? NoScrollHorizontalLayoutManager
        lm?.canScrollHorizontally = true
        super.scrollBy(x, y)
        lm?.canScrollHorizontally = false
    }
}

nikhilpanju

tabsRecyclerView.addOnScrollListener(object : RecyclerView.OnScrollListener() {
    override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
        totalTabsScroll += dx
    }
})

viewPager.registerOnPageChangeCallback(object : ViewPager2.OnPageChangeCallback() {
    override fun onPageScrolled(position: Int, positionOffset: Float, positionOffsetPixels: Int) {
        // Scroll tabs as viewpager is scrolled
        val dx = (position + positionOffset) * tabItemWidth - totalTabsScroll

nikhilpanju

private fun expandItem(holder: ListViewHolder, expand: Boolean, animate: Boolean) {
    if (animate) {
        val animator = getValueAnimator(
                expand, listItemExpandDuration, AccelerateDecelerateInterpolator()
        ) { progress ->
            holder.cardContainer.layoutParams.height =
                    (originalHeight + (expandedHeight - originalHeight) * progress).toInt()
            holder.cardContainer.layoutParams.width =
                    (originalWidth + (expandedWidth - originalWidth) * progress).toInt()

nikhilpanju

cardContainer.doOnLayout { view ->
    originalHeight = view.height
    
    // show expandView and record expandedHeight in next
    // layout pass (doOnNextLayout) and hide it immediately
    expandView.isVisible = true
    cardContainer.doOnNextLayout { view ->
        expandedHeight = view.height
        
        // We use post{} to hide the view. Otherwise the parent will not

nikhilpanju

inline fun <T : View> T.doOnGlobalLayout(crossinline action: () -> Unit) {
    viewTreeObserver.addOnGlobalLayoutListener(object : ViewTreeObserver.OnGlobalLayoutListener {
        override fun onGlobalLayout() {
            viewTreeObserver.removeOnGlobalLayoutListener(this)
            action()
        }
    })
}

nikhilpanju

inline fun getValueAnimator(forward: Boolean = true, duration: Long, interpolator: TimeInterpolator,
                            crossinline updateListener: (progress: Float) -> Unit
): ValueAnimator {
    val a =
            if (forward) ValueAnimator.ofFloat(0f, 1f)
            else ValueAnimator.ofFloat(1f, 0f)
    a.addUpdateListener { updateListener(it.animatedValue as Float) }
    a.duration = duration
    a.interpolator = interpolator
    return a

nikhilpanju

override fun onBindViewHolder(holder: ListViewHolder, position: Int) {
    val model = adapterList[position]

    // set expand state on binded items because views are recycler
    expandItem(holder, model == expandedModel, animate = false)

    holder.cardContainer.setOnClickListener {
        if (expandedModel == null) {
            // expand clicked view
            expandItem(holder, expand = true, animate = true)

nikhilpanju

class ToolbarBehavior : CoordinatorLayout.Behavior<AppBarLayout>() {
   
    /** Consume if vertical scroll because we don't care about other scrolls */
    override fun onStartNestedScroll(coordinatorLayout: CoordinatorLayout, child: AppBarLayout, 
                                     directTargetChild: View, target: View, axes: Int, type: Int): Boolean {
        
        getViews(child)
        return axes == ViewCompat.SCROLL_AXIS_VERTICAL ||
                super.onStartNestedScroll(coordinatorLayout, child, directTargetChild, target, axes, type)
    }