Fix applying preferences while recreating EPUB fragments

CHANGELOG.md

@@ -21,6 +21,7 @@ All notable changes to this project will be documented in this file. Take a look
 #### Navigator
 
 * [#325](https://github.com/readium/kotlin-toolkit/issues/325) Top EPUB selections no longer break when dragging the selection handles.
+* Fixed applying preferences while the EPUB navigator fragment is being recreated.
 
 
 ## [3.0.0-alpha.2]

readium/navigator/src/main/java/org/readium/r2/navigator/epub/EpubNavigatorFragment.kt

@@ -294,8 +294,7 @@ public class EpubNavigatorFragment internal constructor(
     public suspend fun evaluateJavascript(script: String): String? {
         val page = currentReflowablePageFragment ?: return null
         page.awaitLoaded()
-        val webView = page.webView ?: return null
-        return webView.runJavaScriptSuspend(script)
+        return page.runJavaScriptSuspend(script)
     }
 
     private val viewModel: EpubNavigatorViewModel by viewModels {
@@ -665,17 +664,17 @@ public class EpubNavigatorFragment internal constructor(
     private fun run(command: RunScriptCommand) {
         when (command.scope) {
             RunScriptCommand.Scope.CurrentResource -> {
-                currentReflowablePageFragment?.webView
+                currentReflowablePageFragment
                     ?.runJavaScript(command.script)
             }
             RunScriptCommand.Scope.LoadedResources -> {
                 r2PagerAdapter?.mFragments?.forEach { _, fragment ->
-                    (fragment as? R2EpubPageFragment)?.webView
+                    (fragment as? R2EpubPageFragment)
                         ?.runJavaScript(command.script)
                 }
             }
             is RunScriptCommand.Scope.Resource -> {
-                loadedFragmentForHref(command.scope.href)?.webView
+                loadedFragmentForHref(command.scope.href)
                     ?.runJavaScript(command.script)
             }
             is RunScriptCommand.Scope.WebView -> {
@@ -713,9 +712,9 @@ public class EpubNavigatorFragment internal constructor(
     // SelectableNavigator
 
     override suspend fun currentSelection(): Selection? {
-        val webView = currentReflowablePageFragment?.webView ?: return null
+        val fragment = currentReflowablePageFragment ?: return null
         val json =
-            webView.runJavaScriptSuspend("readium.getCurrentSelection();")
+            fragment.runJavaScriptSuspend("readium.getCurrentSelection();")
                 .takeIf { it != "null" }
                 ?.let { tryOrLog { JSONObject(it) } }
                 ?: return null

readium/navigator/src/main/java/org/readium/r2/navigator/pager/R2EpubPageFragment.kt

@@ -11,7 +11,6 @@ package org.readium.r2.navigator.pager
 
 import android.annotation.SuppressLint
 import android.graphics.PointF
-import android.os.Build
 import android.os.Bundle
 import android.util.DisplayMetrics
 import android.view.*
@@ -30,6 +29,8 @@ import androidx.lifecycle.repeatOnLifecycle
 import androidx.webkit.WebViewClientCompat
 import androidx.webkit.WebViewCompat
 import androidx.webkit.WebViewFeature
+import kotlin.coroutines.resume
+import kotlin.coroutines.suspendCoroutine
 import kotlin.math.roundToInt
 import kotlinx.coroutines.flow.*
 import kotlinx.coroutines.launch
@@ -213,6 +214,8 @@ internal class R2EpubPageFragment : Fragment() {
             override fun onPageFinished(view: WebView?, url: String?) {
                 super.onPageFinished(view, url)
 
+                onPageFinished()
+
                 link?.let {
                     webView.listener?.onResourceLoaded(webView, it)
                 }
@@ -249,6 +252,26 @@ internal class R2EpubPageFragment : Fragment() {
         return containerView
     }
 
+    private var isPageFinished = false
+    private val pendingPageFinished = mutableListOf<() -> Unit>()
+
+    /**
+     * Will run the given [action] when the content of the [WebView] is loaded.
+     */
+    fun whenPageFinished(action: () -> Unit) {
+        if (isPageFinished) {
+            action()
+        } else {
+            pendingPageFinished.add(action)
+        }
+    }
+
+    private fun onPageFinished() {
+        isPageFinished = true
+        pendingPageFinished.forEach { it() }
+        pendingPageFinished.clear()
+    }
+
     /**
      * Will run the given [action] when the content of the [WebView] is fully laid out.
      */
@@ -448,6 +471,18 @@ internal class R2EpubPageFragment : Fragment() {
         }
     }
 
+    fun runJavaScript(script: String, callback: ((String) -> Unit)? = null) {
+        whenPageFinished {
+            requireNotNull(webView).runJavaScript(script, callback)
+        }
+    }
+
+    suspend fun runJavaScriptSuspend(javascript: String): String = suspendCoroutine { cont ->
+        runJavaScript(javascript) { result ->
+            cont.resume(result)
+        }
+    }
+
     companion object {
         private const val textZoomBundleKey = "org.readium.textZoom"
 

readium/opds/src/main/java/org/readium/r2/opds/OPDS1Parser.kt

@@ -81,7 +81,7 @@ public class OPDS1Parser {
             ReplaceWith("parse(jsonData, url.toUrl()!!)"),
             DeprecationLevel.ERROR
         )
-        public fun parse(jsonData: ByteArray, url: URL): ParseData =
+        public fun parse(xmlData: ByteArray, url: URL): ParseData =
             throw NotImplementedError()
 
         private fun parseFeed(root: ElementNode, url: Url): Feed {