Use epoxy to render pagedList : WIP

app/build.gradle

@@ -50,6 +50,8 @@ dependencies {
 
     implementation("com.airbnb.android:epoxy:$epoxy_version")
     kapt "com.airbnb.android:epoxy-processor:$epoxy_version"
+    implementation "com.airbnb.android:epoxy-paging:$epoxy_version"
+
 
     implementation "org.koin:koin-android:$koin_version"
     implementation "org.koin:koin-android-scope:$koin_version"

app/src/main/java/im/vector/riotredesign/core/epoxy/KotlinEpoxyHolder.kt

@@ -1,4 +1,4 @@
-package im.vector.riotredesign.core.helpers
+package im.vector.riotredesign.core.epoxy
 
 import android.view.View
 import com.airbnb.epoxy.EpoxyHolder

app/src/main/java/im/vector/riotredesign/core/epoxy/KotlinModel.kt

@@ -1,4 +1,4 @@
-package im.vector.riotredesign.core.helpers
+package im.vector.riotredesign.core.epoxy
 
 import android.support.annotation.IdRes
 import android.support.annotation.LayoutRes

app/src/main/java/im/vector/riotredesign/core/extensions/Activity.kt

@@ -0,0 +1,12 @@
+package im.vector.riotredesign.core.extensions
+
+import android.support.v4.app.Fragment
+import android.support.v7.app.AppCompatActivity
+
+fun AppCompatActivity.addFragment(fragment: Fragment, frameId: Int) {
+    supportFragmentManager.inTransaction { add(frameId, fragment) }
+}
+
+fun AppCompatActivity.replaceFragment(fragment: Fragment, frameId: Int) {
+    supportFragmentManager.inTransaction { replace(frameId, fragment) }
+}

app/src/main/java/im/vector/riotredesign/core/extensions/Fragment.kt

@@ -0,0 +1,19 @@
+package im.vector.riotredesign.core.extensions
+
+import android.support.v4.app.Fragment
+
+fun Fragment.addFragment(fragment: Fragment, frameId: Int) {
+    fragmentManager?.inTransaction { add(frameId, fragment) }
+}
+
+fun Fragment.replaceFragment(fragment: Fragment, frameId: Int) {
+    fragmentManager?.inTransaction { replace(frameId, fragment) }
+}
+
+fun Fragment.addChildFragment(fragment: Fragment, frameId: Int) {
+    childFragmentManager.inTransaction { add(frameId, fragment) }
+}
+
+fun Fragment.replaceChildFragment(fragment: Fragment, frameId: Int) {
+    childFragmentManager.inTransaction { replace(frameId, fragment) }
+}

app/src/main/java/im/vector/riotredesign/core/extensions/FragmentManager.kt

@@ -0,0 +1,8 @@
+package im.vector.riotredesign.core.extensions
+
+import android.support.v4.app.FragmentManager
+import android.support.v4.app.FragmentTransaction
+
+inline fun FragmentManager.inTransaction(func: FragmentTransaction.() -> FragmentTransaction) {
+    beginTransaction().func().commit()
+}

app/src/main/java/im/vector/riotredesign/core/utils/FragmentArgumentDelegate.kt

@@ -0,0 +1,48 @@
+package im.vector.riotredesign.core.utils
+
+import android.os.Binder
+import android.os.Bundle
+import android.support.v4.app.BundleCompat
+import android.support.v4.app.Fragment
+import kotlin.reflect.KProperty
+
+class FragmentArgumentDelegate<T : Any> : kotlin.properties.ReadWriteProperty<Fragment, T> {
+
+    var value: T? = null
+
+    override operator fun getValue(thisRef: android.support.v4.app.Fragment, property: kotlin.reflect.KProperty<*>): T {
+        if (value == null) {
+            val args = thisRef.arguments
+                       ?: throw IllegalStateException("Cannot read property ${property.name} if no arguments have been set")
+            @Suppress("UNCHECKED_CAST")
+            value = args.get(property.name) as T
+        }
+        return value ?: throw IllegalStateException("Property ${property.name} could not be read")
+    }
+
+    override operator fun setValue(thisRef: Fragment, property: KProperty<*>, value: T) {
+        if (thisRef.arguments == null) {
+            thisRef.arguments = Bundle()
+        }
+        val args = thisRef.arguments!!
+        val key = property.name
+
+        when (value) {
+            is String                -> args.putString(key, value)
+            is Int                   -> args.putInt(key, value)
+            is Short                 -> args.putShort(key, value)
+            is Long                  -> args.putLong(key, value)
+            is Byte                  -> args.putByte(key, value)
+            is ByteArray             -> args.putByteArray(key, value)
+            is Char                  -> args.putChar(key, value)
+            is CharArray             -> args.putCharArray(key, value)
+            is CharSequence          -> args.putCharSequence(key, value)
+            is Float                 -> args.putFloat(key, value)
+            is Bundle                -> args.putBundle(key, value)
+            is Binder                -> BundleCompat.putBinder(args, key, value)
+            is android.os.Parcelable -> args.putParcelable(key, value)
+            is java.io.Serializable  -> args.putSerializable(key, value)
+            else                     -> throw IllegalStateException("Type ${value.javaClass.canonicalName} of property ${property.name} is not supported")
+        }
+    }
+} 

app/src/main/java/im/vector/riotredesign/features/home/HomeActivity.kt

@@ -4,6 +4,7 @@ import android.content.Context
 import android.content.Intent
 import android.os.Bundle
 import im.vector.riotredesign.R
+import im.vector.riotredesign.core.extensions.replaceFragment
 import im.vector.riotredesign.core.platform.RiotActivity
 
 
@@ -15,9 +16,7 @@ class HomeActivity : RiotActivity() {
 
         if (savedInstanceState == null) {
             val roomListFragment = RoomListFragment.newInstance()
-            val ft = supportFragmentManager.beginTransaction()
-            ft.replace(R.id.homeFragmentContainer, roomListFragment)
-            ft.commit()
+            replaceFragment(roomListFragment, R.id.homeFragmentContainer)
         }
     }
 

app/src/main/java/im/vector/riotredesign/features/home/LoadingItem.kt

@@ -0,0 +1,8 @@
+package im.vector.riotredesign.features.home
+
+import android.content.Context
+import android.widget.ProgressBar
+import com.airbnb.epoxy.ModelView
+
+@ModelView(autoLayout = ModelView.Size.MATCH_WIDTH_WRAP_HEIGHT)
+class LoadingItem(context: Context) : ProgressBar(context)

app/src/main/java/im/vector/riotredesign/features/home/RoomDetailFragment.kt

@@ -0,0 +1,60 @@
+package im.vector.riotredesign.features.home
+
+import android.arch.lifecycle.Observer
+import android.arch.paging.PagedList
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.Toast
+import im.vector.matrix.android.api.Matrix
+import im.vector.matrix.android.api.session.events.model.Event
+import im.vector.matrix.android.api.session.room.Room
+import im.vector.riotredesign.R
+import im.vector.riotredesign.core.platform.RiotFragment
+import im.vector.riotredesign.core.utils.FragmentArgumentDelegate
+import org.koin.android.ext.android.inject
+
+class RoomDetailFragment : RiotFragment(), RoomController.Callback {
+
+    companion object {
+
+        fun newInstance(roomId: String): RoomDetailFragment {
+            return RoomDetailFragment().apply {
+                this.roomId = roomId
+            }
+        }
+    }
+
+    private val matrix by inject<Matrix>()
+    private val currentSession = matrix.currentSession!!
+    private var roomId by FragmentArgumentDelegate<String>()
+
+    private val timelineController = TimelineEventController()
+    private val room: Room? by lazy {
+        currentSession.getRoom(roomId)
+    }
+
+    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
+        return inflater.inflate(R.layout.fragment_room_detail, container, false)
+    }
+
+    override fun onActivityCreated(savedInstanceState: Bundle?) {
+        super.onActivityCreated(savedInstanceState)
+        if (room == null) {
+            activity?.onBackPressed()
+            return
+        }
+        room?.liveTimeline()?.observe(this, Observer { renderEvents(it) })
+    }
+
+    private fun renderEvents(events: PagedList<Event>?) {
+        timelineController.submitList(events)
+    }
+
+    override fun onRoomSelected(room: Room) {
+        Toast.makeText(context, "Room ${room.roomId} clicked", Toast.LENGTH_SHORT).show()
+    }
+
+
+}

app/src/main/java/im/vector/riotredesign/features/home/RoomItem.kt

@@ -2,7 +2,7 @@ package im.vector.riotredesign.features.home
 
 import android.widget.TextView
 import im.vector.riotredesign.R
-import im.vector.riotredesign.core.helpers.KotlinModel
+import im.vector.riotredesign.core.epoxy.KotlinModel
 
 data class RoomItem(
         val title: String,

app/src/main/java/im/vector/riotredesign/features/home/RoomListFragment.kt

@@ -5,10 +5,10 @@ import android.os.Bundle
 import android.view.LayoutInflater
 import android.view.View
 import android.view.ViewGroup
-import android.widget.Toast
 import im.vector.matrix.android.api.Matrix
 import im.vector.matrix.android.api.session.room.Room
 import im.vector.riotredesign.R
+import im.vector.riotredesign.core.extensions.replaceFragment
 import im.vector.riotredesign.core.platform.RiotFragment
 import kotlinx.android.synthetic.main.fragment_room_list.*
 import org.koin.android.ext.android.inject
@@ -42,7 +42,8 @@ class RoomListFragment : RiotFragment(), RoomController.Callback {
     }
 
     override fun onRoomSelected(room: Room) {
-        Toast.makeText(context, "Room ${room.roomId} clicked", Toast.LENGTH_SHORT).show()
+        val detailFragment = RoomDetailFragment.newInstance(room.roomId)
+        replaceFragment(detailFragment, R.id.homeFragmentContainer)
     }
 
 

app/src/main/java/im/vector/riotredesign/features/home/TimelineEventController.kt

@@ -0,0 +1,28 @@
+package im.vector.riotredesign.features.home
+
+import com.airbnb.epoxy.EpoxyAsyncUtil
+import com.airbnb.epoxy.EpoxyModel
+import com.airbnb.epoxy.paging.PagedListEpoxyController
+import im.vector.matrix.android.api.session.events.model.Event
+
+class TimelineEventController : PagedListEpoxyController<Event>(
+        modelBuildingHandler = EpoxyAsyncUtil.getAsyncBackgroundHandler()
+) {
+
+    override fun buildItemModel(currentPosition: Int, item: Event?): EpoxyModel<*> {
+        return if (item == null) {
+            LoadingItemModel_().id(-currentPosition)
+        } else {
+            TimelineEventItem(item.eventId ?: "$currentPosition").id(currentPosition)
+        }
+    }
+
+    init {
+        isDebugLoggingEnabled = true
+    }
+
+    override fun onExceptionSwallowed(exception: RuntimeException) {
+        throw exception
+    }
+
+}

app/src/main/java/im/vector/riotredesign/features/home/TimelineEventItem.kt

@@ -0,0 +1,18 @@
+package im.vector.riotredesign.features.home
+
+import android.widget.TextView
+import im.vector.riotredesign.R
+import im.vector.riotredesign.core.epoxy.KotlinModel
+
+data class TimelineEventItem(
+        val title: String,
+        val listener: (() -> Unit)? = null
+) : KotlinModel(R.layout.item_event) {
+
+    val titleView by bind<TextView>(R.id.titleView)
+
+    override fun bind() {
+        titleView.setOnClickListener { listener?.invoke() }
+        titleView.text = title
+    }
+}

app/src/main/res/layout/fragment_room_detail.xml

@@ -3,4 +3,9 @@
     xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
     android:layout_height="match_parent">
 
+    <com.airbnb.epoxy.EpoxyRecyclerView
+        android:id="@+id/epoxyRecyclerView"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent" />
+
 </android.support.constraint.ConstraintLayout>

app/src/main/res/layout/item_event.xml

@@ -1,6 +1,10 @@
 <?xml version="1.0" encoding="utf-8"?>
-<android.support.constraint.ConstraintLayout
-    xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
-    android:layout_height="match_parent">
-
-</android.support.constraint.ConstraintLayout>
+<TextView xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:id="@+id/titleView"
+    android:layout_width="match_parent"
+    android:layout_height="80dp"
+    android:gravity="center_vertical"
+    android:padding="16dp"
+    android:textSize="14sp"
+    tools:text="Room name" />

app/src/main/res/layout/item_loading.xml

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<ProgressBar xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/progressBar"
+    android:layout_width="match_parent"
+    android:layout_height="80dp"
+    android:padding="16dp" />

matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/database/query/EventEntityQueries.kt

@@ -11,11 +11,11 @@ fun EventEntity.Companion.where(realm: Realm, roomId: String): RealmQuery<EventE
             .equalTo("chunk.room.roomId", roomId)
 }
 
-fun EventEntity.Companion.where(realm: Realm, chunk: ChunkEntity?): RealmQuery<EventEntity> {
+fun EventEntity.Companion.where(realm: Realm, chunk: ChunkEntity): RealmQuery<EventEntity> {
     return realm.where(EventEntity::class.java)
-            .equalTo("chunk.prevToken", chunk?.prevToken)
+            .equalTo("chunk.prevToken", chunk.prevToken)
             .and()
-            .equalTo("chunk.nextToken", chunk?.nextToken)
+            .equalTo("chunk.nextToken", chunk.nextToken)
 }
 
 fun RealmResults<EventEntity>.getLast(type: String? = null): EventEntity? {

matrix-sdk-android/src/main/java/im/vector/matrix/android/internal/session/room/DefaultRoom.kt

@@ -27,7 +27,11 @@ data class DefaultRoom(
     override fun liveTimeline(): LiveData<PagedList<Event>> {
         val realmDataSourceFactory = monarchy.createDataSourceFactory { realm ->
             val lastChunk = ChunkEntity.where(realm, roomId).findAll().last()
-            EventEntity.where(realm, lastChunk)
+            if (lastChunk == null) {
+                EventEntity.where(realm, roomId)
+            } else {
+                EventEntity.where(realm, lastChunk)
+            }
         }
         val domainSourceFactory = realmDataSourceFactory.map { EventMapper.map(it) }
         val livePagedListBuilder = LivePagedListBuilder(domainSourceFactory, 20).setBoundaryCallback(boundaryCallback)