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package com.pitchedapps.frost.web
import android.animation.ValueAnimator
import android.annotation.SuppressLint
import android.content.Context
import android.support.v4.view.MotionEventCompat
import android.support.v4.view.NestedScrollingChild
import android.support.v4.view.NestedScrollingChildHelper
import android.support.v4.view.ViewCompat
import android.util.AttributeSet
import android.view.MotionEvent
import android.view.View
import android.view.animation.DecelerateInterpolator
import android.webkit.CookieManager
import android.webkit.WebView
import com.pitchedapps.frost.utils.L
import io.reactivex.Scheduler
import io.reactivex.android.schedulers.AndroidSchedulers
import io.reactivex.disposables.Disposable
import io.reactivex.subjects.BehaviorSubject
/**
* Created by Allan Wang on 2017-05-29.
*
* Courtesy of takahirom
*
* https://github.com/takahirom/webview-in-coordinatorlayout/blob/master/app/src/main/java/com/github/takahirom/webview_in_coodinator_layout/NestedWebView.java
*/
class FrostWebViewCore @JvmOverloads constructor(
context: Context, attrs: AttributeSet? = null, defStyleAttr: Int = 0
) : WebView(context, attrs, defStyleAttr), NestedScrollingChild {
private val childHelper = NestedScrollingChildHelper(this)
private var lastY: Int = 0
private val scrollOffset = IntArray(2)
private val scrollConsumed = IntArray(2)
private var nestedOffsetY: Int = 0
val progressObservable: BehaviorSubject<Int> // Keeps track of every progress change
val refreshObservable: BehaviorSubject<Boolean> // Only emits on page loads
val titleObservable: BehaviorSubject<String> // Only emits on different non http titles
var baseUrl: String? = null
init {
isNestedScrollingEnabled = true
progressObservable = BehaviorSubject.create<Int>()
refreshObservable = BehaviorSubject.create<Boolean>()
titleObservable = BehaviorSubject.create<String>()
setupWebview()
}
@SuppressLint("SetJavaScriptEnabled")
fun setupWebview() {
settings.javaScriptEnabled = true
// settings.domStorageEnabled = true
setLayerType(View.LAYER_TYPE_HARDWARE, null)
setWebViewClient(FrostWebViewClient(refreshObservable))
setWebChromeClient(FrostChromeClient(progressObservable, titleObservable))
}
override fun loadUrl(url: String?) {
if (url != null)
super.loadUrl(url)
}
fun loadBaseUrl() = loadUrl(baseUrl)
fun addTitleListener(subscriber: (title: String) -> Unit, scheduler: Scheduler = AndroidSchedulers.mainThread()): Disposable
= titleObservable.observeOn(scheduler).subscribe(subscriber)
override fun onTouchEvent(ev: MotionEvent): Boolean {
val event = MotionEvent.obtain(ev)
val action = MotionEventCompat.getActionMasked(event)
if (action == MotionEvent.ACTION_DOWN)
nestedOffsetY = 0
val eventY = event.y.toInt()
event.offsetLocation(0f, nestedOffsetY.toFloat())
val returnValue: Boolean
when (action) {
MotionEvent.ACTION_MOVE -> {
var deltaY = lastY - eventY
// NestedPreScroll
if (dispatchNestedPreScroll(0, deltaY, scrollConsumed, scrollOffset)) {
deltaY -= scrollConsumed[1]
event.offsetLocation(0f, -scrollOffset[1].toFloat())
nestedOffsetY += scrollOffset[1]
}
lastY = eventY - scrollOffset[1]
returnValue = super.onTouchEvent(event)
// NestedScroll
if (dispatchNestedScroll(0, scrollOffset[1], 0, deltaY, scrollOffset)) {
event.offsetLocation(0f, scrollOffset[1].toFloat())
nestedOffsetY += scrollOffset[1]
lastY -= scrollOffset[1]
}
}
MotionEvent.ACTION_DOWN -> {
returnValue = super.onTouchEvent(event)
lastY = eventY
startNestedScroll(ViewCompat.SCROLL_AXIS_VERTICAL)
}
MotionEvent.ACTION_UP, MotionEvent.ACTION_CANCEL -> {
returnValue = super.onTouchEvent(event)
stopNestedScroll()
}
else -> return false
}
return returnValue
}
/**
* If webview is already at the top, refresh
* Otherwise scroll to top
*/
fun scrollOrRefresh() {
L.d("Scroll or Refresh")
if (scrollY < 5) loadBaseUrl()
else scrollToTop()
}
fun scrollToTop() {
if (scrollY > 1000) scrollTo(0, 0)
else {
val animator = ValueAnimator.ofInt(scrollY, 0)
animator.duration = scrollY.toLong()
animator.interpolator = DecelerateInterpolator()
animator.addUpdateListener {
scrollY = it.animatedValue as Int
invalidate()
}
}
}
// Nested Scroll implements
override fun setNestedScrollingEnabled(enabled: Boolean) {
childHelper.isNestedScrollingEnabled = enabled
}
override fun isNestedScrollingEnabled() = childHelper.isNestedScrollingEnabled
override fun startNestedScroll(axes: Int) = childHelper.startNestedScroll(axes)
override fun stopNestedScroll() = childHelper.stopNestedScroll()
override fun hasNestedScrollingParent() = childHelper.hasNestedScrollingParent()
override fun dispatchNestedScroll(dxConsumed: Int, dyConsumed: Int, dxUnconsumed: Int, dyUnconsumed: Int, offsetInWindow: IntArray?)
= childHelper.dispatchNestedScroll(dxConsumed, dyConsumed, dxUnconsumed, dyUnconsumed, offsetInWindow)
override fun dispatchNestedPreScroll(dx: Int, dy: Int, consumed: IntArray?, offsetInWindow: IntArray?)
= childHelper.dispatchNestedPreScroll(dx, dy, consumed, offsetInWindow)
override fun dispatchNestedFling(velocityX: Float, velocityY: Float, consumed: Boolean)
= childHelper.dispatchNestedFling(velocityX, velocityY, consumed)
override fun dispatchNestedPreFling(velocityX: Float, velocityY: Float)
= childHelper.dispatchNestedPreFling(velocityX, velocityY)
}
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