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PagerViewViewManager.kt
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PagerViewViewManager.kt
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package versioned.host.exp.exponent.modules.api.components.pagerview
import android.view.View
import android.view.ViewGroup
import androidx.viewpager2.widget.ViewPager2
import androidx.viewpager2.widget.ViewPager2.OnPageChangeCallback
import com.facebook.infer.annotation.Assertions
import com.facebook.react.bridge.ReadableArray
import com.facebook.react.common.MapBuilder
import com.facebook.react.uimanager.PixelUtil
import com.facebook.react.uimanager.ThemedReactContext
import com.facebook.react.uimanager.UIManagerModule
import com.facebook.react.uimanager.ViewGroupManager
import com.facebook.react.uimanager.annotations.ReactProp
import com.facebook.react.uimanager.events.EventDispatcher
import versioned.host.exp.exponent.modules.api.components.pagerview.event.PageScrollEvent
import versioned.host.exp.exponent.modules.api.components.pagerview.event.PageScrollStateChangedEvent
import versioned.host.exp.exponent.modules.api.components.pagerview.event.PageSelectedEvent
class PagerViewViewManager : ViewGroupManager<NestedScrollableHost>() {
private lateinit var eventDispatcher: EventDispatcher
override fun getName(): String {
return REACT_CLASS
}
override fun createViewInstance(reactContext: ThemedReactContext): NestedScrollableHost {
val host = NestedScrollableHost(reactContext)
host.id = View.generateViewId()
host.layoutParams = ViewGroup.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.MATCH_PARENT)
host.isSaveEnabled = false
val vp = ViewPager2(reactContext)
vp.adapter = ViewPagerAdapter()
//https://github.com/callstack/react-native-viewpager/issues/183
vp.isSaveEnabled = false
eventDispatcher = reactContext.getNativeModule(UIManagerModule::class.java)!!.eventDispatcher
vp.post {
vp.registerOnPageChangeCallback(object : OnPageChangeCallback() {
override fun onPageScrolled(position: Int, positionOffset: Float, positionOffsetPixels: Int) {
super.onPageScrolled(position, positionOffset, positionOffsetPixels)
eventDispatcher.dispatchEvent(
PageScrollEvent(host.id, position, positionOffset))
}
override fun onPageSelected(position: Int) {
super.onPageSelected(position)
eventDispatcher.dispatchEvent(
PageSelectedEvent(host.id, position))
}
override fun onPageScrollStateChanged(state: Int) {
super.onPageScrollStateChanged(state)
val pageScrollState: String = when (state) {
ViewPager2.SCROLL_STATE_IDLE -> "idle"
ViewPager2.SCROLL_STATE_DRAGGING -> "dragging"
ViewPager2.SCROLL_STATE_SETTLING -> "settling"
else -> throw IllegalStateException("Unsupported pageScrollState")
}
eventDispatcher.dispatchEvent(
PageScrollStateChangedEvent(host.id, pageScrollState))
}
})
eventDispatcher.dispatchEvent(PageSelectedEvent(host.id, vp.currentItem))
}
host.addView(vp)
return host
}
private fun getViewPager(view: NestedScrollableHost): ViewPager2 {
if (view.getChildAt(0) is ViewPager2) {
return view.getChildAt(0) as ViewPager2
} else {
throw ClassNotFoundException("Could not retrieve ViewPager2 instance")
}
}
private fun setCurrentItem(view: ViewPager2, selectedTab: Int, scrollSmooth: Boolean) {
refreshViewChildrenLayout(view)
view.setCurrentItem(selectedTab, scrollSmooth)
}
override fun addView(host: NestedScrollableHost, child: View?, index: Int) {
if (child == null) {
return
}
val parent = getViewPager(host)
(parent.adapter as ViewPagerAdapter?)?.addChild(child, index);
if (parent.currentItem == index) {
// Solves https://github.com/callstack/react-native-pager-view/issues/219
// Required so ViewPager actually displays first dynamically added child
// (otherwise a white screen is shown until the next user interaction).
// https://github.com/facebook/react-native/issues/17968#issuecomment-697136929
refreshViewChildrenLayout(parent)
}
if (!host.didSetInitialIndex && host.initialIndex == index) {
host.didSetInitialIndex = true
setCurrentItem(parent, index, false)
}
}
override fun getChildCount(parent: NestedScrollableHost) = getViewPager(parent).adapter?.itemCount ?: 0
override fun getChildAt(parent: NestedScrollableHost, index: Int): View {
val view = getViewPager(parent)
return (view.adapter as ViewPagerAdapter?)!!.getChildAt(index)
}
override fun removeView(parent: NestedScrollableHost, view: View) {
val pager = getViewPager(parent)
(pager.adapter as ViewPagerAdapter?)?.removeChild(view)
// Required so ViewPager actually animates the removed view right away (otherwise
// a white screen is shown until the next user interaction).
// https://github.com/facebook/react-native/issues/17968#issuecomment-697136929
refreshViewChildrenLayout(pager)
}
override fun removeAllViews(parent: NestedScrollableHost) {
val pager = getViewPager(parent)
pager.isUserInputEnabled = false
val adapter = pager.adapter as ViewPagerAdapter?
adapter?.removeAll()
}
override fun removeViewAt(parent: NestedScrollableHost, index: Int) {
val pager = getViewPager(parent)
val adapter = pager.adapter as ViewPagerAdapter?
adapter?.removeChildAt(index)
// Required so ViewPager actually animates the removed view right away (otherwise
// a white screen is shown until the next user interaction).
// https://github.com/facebook/react-native/issues/17968#issuecomment-697136929
refreshViewChildrenLayout(pager)
}
override fun needsCustomLayoutForChildren(): Boolean {
return true
}
@ReactProp(name = "scrollEnabled", defaultBoolean = true)
fun setScrollEnabled(host: NestedScrollableHost, value: Boolean) {
getViewPager(host).isUserInputEnabled = value
}
@ReactProp(name = "initialPage", defaultInt = 0)
fun setInitialPage(host: NestedScrollableHost, value: Int) {
val view = getViewPager(host)
//https://github.com/callstack/react-native-pager-view/issues/456
//Initial index should be set only once.
if (host.initialIndex === null) {
host.initialIndex = value
view.post {
host.didSetInitialIndex = true
}
}
}
@ReactProp(name = "orientation")
fun setOrientation(host: NestedScrollableHost, value: String) {
getViewPager(host).orientation = if (value == "vertical") ViewPager2.ORIENTATION_VERTICAL else ViewPager2.ORIENTATION_HORIZONTAL
}
@ReactProp(name = "offscreenPageLimit", defaultInt = ViewPager2.OFFSCREEN_PAGE_LIMIT_DEFAULT)
operator fun set(host: NestedScrollableHost, value: Int) {
getViewPager(host).offscreenPageLimit = value
}
@ReactProp(name = "overScrollMode")
fun setOverScrollMode(host: NestedScrollableHost, value: String) {
val child = getViewPager(host).getChildAt(0)
when (value) {
"never" -> {
child.overScrollMode = ViewPager2.OVER_SCROLL_NEVER
}
"always" -> {
child.overScrollMode = ViewPager2.OVER_SCROLL_ALWAYS
}
else -> {
child.overScrollMode = ViewPager2.OVER_SCROLL_IF_CONTENT_SCROLLS
}
}
}
@ReactProp(name = "layoutDirection")
fun setLayoutDirection(host: NestedScrollableHost, value: String) {
val view = getViewPager(host)
when (value) {
"rtl" -> {
view.layoutDirection = View.LAYOUT_DIRECTION_RTL
}
else -> {
view.layoutDirection = View.LAYOUT_DIRECTION_LTR
}
}
}
override fun getExportedCustomDirectEventTypeConstants(): MutableMap<String, Map<String, String>> {
return MapBuilder.of(
PageScrollEvent.EVENT_NAME, MapBuilder.of("registrationName", "onPageScroll"),
PageScrollStateChangedEvent.EVENT_NAME, MapBuilder.of("registrationName", "onPageScrollStateChanged"),
PageSelectedEvent.EVENT_NAME, MapBuilder.of("registrationName", "onPageSelected"))
}
override fun getCommandsMap(): Map<String, Int>? {
return MapBuilder.of(
"setPage",
COMMAND_SET_PAGE,
"setPageWithoutAnimation",
COMMAND_SET_PAGE_WITHOUT_ANIMATION,
"setScrollEnabled",
COMMAND_SET_SCROLL_ENABLED)
}
override fun receiveCommand(root: NestedScrollableHost, commandId: Int, args: ReadableArray?) {
super.receiveCommand(root, commandId, args)
val view = getViewPager(root)
Assertions.assertNotNull(view)
Assertions.assertNotNull(args)
val childCount = view.adapter?.itemCount
when (commandId) {
COMMAND_SET_PAGE, COMMAND_SET_PAGE_WITHOUT_ANIMATION -> {
val pageIndex = args!!.getInt(0)
val canScroll = childCount != null && childCount > 0 && pageIndex >= 0 && pageIndex < childCount
if (canScroll) {
val scrollWithAnimation = commandId == COMMAND_SET_PAGE
setCurrentItem(view, pageIndex, scrollWithAnimation)
eventDispatcher.dispatchEvent(PageSelectedEvent(root.id, pageIndex))
}
}
COMMAND_SET_SCROLL_ENABLED -> {
view.isUserInputEnabled = args!!.getBoolean(0)
}
else -> throw IllegalArgumentException(String.format(
"Unsupported command %d received by %s.",
commandId,
javaClass.simpleName))
}
}
@ReactProp(name = "pageMargin", defaultFloat = 0F)
fun setPageMargin(host: NestedScrollableHost, margin: Float) {
val pager = getViewPager(host)
val pageMargin = PixelUtil.toPixelFromDIP(margin).toInt()
/**
* Don't use MarginPageTransformer to be able to support negative margins
*/
pager.setPageTransformer { page, position ->
val offset = pageMargin * position
if (pager.orientation == ViewPager2.ORIENTATION_HORIZONTAL) {
val isRTL = pager.layoutDirection == View.LAYOUT_DIRECTION_RTL
page.translationX = if (isRTL) -offset else offset
} else {
page.translationY = offset
}
}
}
private fun refreshViewChildrenLayout(view: View) {
view.post {
view.measure(
View.MeasureSpec.makeMeasureSpec(view.width, View.MeasureSpec.EXACTLY),
View.MeasureSpec.makeMeasureSpec(view.height, View.MeasureSpec.EXACTLY))
view.layout(view.left, view.top, view.right, view.bottom)
}
}
companion object {
private const val REACT_CLASS = "RNCViewPager"
private const val COMMAND_SET_PAGE = 1
private const val COMMAND_SET_PAGE_WITHOUT_ANIMATION = 2
private const val COMMAND_SET_SCROLL_ENABLED = 3
}
}