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CardSliderViewPager.kt
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CardSliderViewPager.kt
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package com.github.islamkhsh
import android.content.Context
import android.graphics.Rect
import android.os.Handler
import android.os.Looper
import android.util.AttributeSet
import android.view.View
import androidx.core.util.forEach
import androidx.core.view.children
import androidx.databinding.BindingMethod
import androidx.databinding.BindingMethods
import androidx.recyclerview.widget.RecyclerView
import androidx.recyclerview.widget.RecyclerView.ItemDecoration
import com.github.islamkhsh.viewpager2.ViewPager2
import java.util.*
import kotlin.math.max
@BindingMethods(
value = [
BindingMethod(
type = CardSliderViewPager::class,
attribute = "cardSlider_pageMargin",
method = "setSliderPageMargin"
),
BindingMethod(
type = CardSliderViewPager::class,
attribute = "cardSlider_otherPagesWidth",
method = "setOtherPagesWidth"
),
BindingMethod(
type = CardSliderViewPager::class,
attribute = "cardSlider_smallScaleFactor",
method = "setSmallScaleFactor"
),
BindingMethod(
type = CardSliderViewPager::class,
attribute = "cardSlider_smallAlphaFactor",
method = "setSmallAlphaFactor"
),
BindingMethod(
type = CardSliderViewPager::class,
attribute = "cardSlider_minShadow",
method = "setMinShadow"
),
BindingMethod(
type = CardSliderViewPager::class,
attribute = "cardSlider_baseShadow",
method = "setBaseShadow"
),
BindingMethod(
type = CardSliderViewPager::class,
attribute = "auto_slide_time",
method = "setAutoSlideTime"
)
]
)
open class CardSliderViewPager : ViewPager2 {
companion object {
const val STOP_AUTO_SLIDING = -1
}
private var indicatorId = View.NO_ID
private val recyclerViewInstance = children.first { it is RecyclerView } as RecyclerView
/**
* The small scale factor, height of cards in right and left (previous and next cards)
*/
var smallScaleFactor = 1f
set(value) {
field = value
(adapter as? CardSliderAdapter<*>)?.viewHolders?.forEach { position, holder ->
if (position != currentItem)
holder.itemView.scaleY = field
}
}
/**
* The small alpha factor, opacity of cards in right and left (previous and next cards)
*/
var smallAlphaFactor = 1f
set(value) {
field = value
(adapter as? CardSliderAdapter<*>)?.viewHolders?.forEach { position, holder ->
if (position != currentItem)
holder.itemView.alpha = field
}
}
/**
* The card shadow in case of current card
*/
var baseShadow = 0.0f
set(value) {
field = value
setPageMargin()
}
/**
* The card shadow in case of previous and next cards
*/
var minShadow = baseShadow * smallScaleFactor
set(value) {
field = value
setPageMargin()
}
/**
* Space between pages
*/
var sliderPageMargin = baseShadow
set(value) {
field = value
setPageMargin()
}
/**
* The width of displayed part from previous and next cards
*/
var otherPagesWidth = 0f
set(value) {
field = value
setPagePadding()
}
/**
* The auto sliding time in seconds
*/
var autoSlideTime = STOP_AUTO_SLIDING
set(value) {
field = value
initAutoSlidingTimer()
}
private lateinit var timer: Timer
constructor(context: Context) : super(context) {
init(null)
}
constructor(context: Context, attrs: AttributeSet) : super(context, attrs) {
init(attrs)
}
private fun init(attrs: AttributeSet?) {
val typedArray = context.obtainStyledAttributes(attrs, R.styleable.CardSliderViewPager)
smallScaleFactor =
typedArray.getFloat(R.styleable.CardSliderViewPager_cardSlider_smallScaleFactor, 1f)
smallAlphaFactor =
typedArray.getFloat(R.styleable.CardSliderViewPager_cardSlider_smallAlphaFactor, 1f)
baseShadow = typedArray.getDimension(
R.styleable.CardSliderViewPager_cardSlider_baseShadow,
context.resources.getDimension(R.dimen.baseCardElevation)
)
minShadow =
typedArray.getDimension(
R.styleable.CardSliderViewPager_cardSlider_minShadow,
baseShadow * smallScaleFactor
)
sliderPageMargin =
typedArray.getDimension(
R.styleable.CardSliderViewPager_cardSlider_pageMargin,
baseShadow + minShadow
)
otherPagesWidth =
typedArray.getDimension(R.styleable.CardSliderViewPager_cardSlider_otherPagesWidth, 0f)
indicatorId =
typedArray.getResourceId(
R.styleable.CardSliderViewPager_cardSlider_indicator,
View.NO_ID
)
autoSlideTime =
typedArray.getInt(R.styleable.CardSliderViewPager_auto_slide_time, STOP_AUTO_SLIDING)
typedArray.recycle()
recyclerViewInstance.clipToPadding = false
}
private fun setPageMargin() {
val pageMargin = max(sliderPageMargin, baseShadow + minShadow)
recyclerViewInstance.addItemDecoration(PageDecoration(pageMargin))
}
private fun setPagePadding() {
recyclerViewInstance.run {
val pageMargin = max(sliderPageMargin, baseShadow + minShadow).toInt()
if (orientation == ORIENTATION_HORIZONTAL)
setPadding(
otherPagesWidth.toInt() + pageMargin / 2, max(paddingTop, baseShadow.toInt()),
otherPagesWidth.toInt() + pageMargin / 2, max(paddingBottom, baseShadow.toInt())
)
else
setPadding(
max(paddingLeft, baseShadow.toInt()), otherPagesWidth.toInt() + pageMargin / 2,
max(paddingRight, baseShadow.toInt()), otherPagesWidth.toInt() + pageMargin / 2
)
}
}
/**
* Set a CardSliderAdapter that will supply views for this pager.
* @param adapter PagerAdapter? instance of CardSliderAdapter
* @throws IllegalArgumentException if adapter passed isn't a CardSliderAdapter
*/
@Throws(IllegalArgumentException::class)
override fun setAdapter(adapter: RecyclerView.Adapter<*>?) {
require(adapter is CardSliderAdapter<*>) { "adapter must be CardSliderAdapter" }
super.setAdapter(adapter)
setPageTransformer(CardSliderTransformer(this))
rootView.findViewById<CardSliderIndicator>(indicatorId)?.run {
viewPager = this@CardSliderViewPager
}
doOnPageSelected { initAutoSlidingTimer() }
}
private fun initAutoSlidingTimer() {
if (::timer.isInitialized) {
timer.cancel()
timer.purge()
}
if (autoSlideTime != STOP_AUTO_SLIDING) {
timer = Timer()
timer.schedule(SlidingTask(), autoSlideTime.toLong() * 1000)
}
}
private inner class SlidingTask : TimerTask() {
override fun run() {
adapter?.run {
Handler(Looper.getMainLooper()).post {
currentItem = if (currentItem == itemCount - 1) 0 else currentItem + 1
}
}
}
}
inner class PageDecoration(private val space: Float) : ItemDecoration() {
override fun getItemOffsets(
outRect: Rect, view: View,
parent: RecyclerView, state: RecyclerView.State
) {
if (orientation == ORIENTATION_HORIZONTAL) {
outRect.left = (space / 2).toInt()
outRect.right = (space / 2).toInt()
outRect.top = 0
outRect.bottom = 0
} else {
outRect.top = (space / 2).toInt()
outRect.bottom = (space / 2).toInt()
outRect.left = 0
outRect.right = 0
}
}
}
}