Closes #1004: Integrating ThumbnailsFeature.

app/src/main/java/org/mozilla/fenix/browser/BrowserFragment.kt

@@ -4,6 +4,7 @@
 
 package org.mozilla.fenix.browser
 
+import android.content.ComponentCallbacks2
 import android.content.Context
 import android.content.Intent
 import android.net.Uri
@@ -30,6 +31,7 @@ import mozilla.components.feature.prompts.PromptFeature
 import mozilla.components.feature.session.FullScreenFeature
 import mozilla.components.feature.session.SessionFeature
 import mozilla.components.feature.session.SessionUseCases
+import mozilla.components.feature.session.ThumbnailsFeature
 import mozilla.components.feature.sitepermissions.SitePermissionsFeature
 import mozilla.components.support.base.feature.BackHandler
 import mozilla.components.support.base.feature.ViewBoundFeatureWrapper
@@ -53,7 +55,7 @@ import org.mozilla.fenix.ext.share
 import org.mozilla.fenix.mvi.ActionBusFactory
 import org.mozilla.fenix.mvi.getAutoDisposeObservable
 
-class BrowserFragment : Fragment(), BackHandler {
+class BrowserFragment : Fragment(), BackHandler, ComponentCallbacks2 {
     private lateinit var toolbarComponent: ToolbarComponent
 
     private val sessionFeature = ViewBoundFeatureWrapper<SessionFeature>()
@@ -65,6 +67,7 @@ class BrowserFragment : Fragment(), BackHandler {
     private val toolbarIntegration = ViewBoundFeatureWrapper<ToolbarIntegration>()
     private val sitePermissionsFeature = ViewBoundFeatureWrapper<SitePermissionsFeature>()
     private val fullScreenFeature = ViewBoundFeatureWrapper<FullScreenFeature>()
+    private val thumbnailsFeature = ViewBoundFeatureWrapper<ThumbnailsFeature>()
     var sessionId: String? = null
 
     override fun onCreateView(
@@ -207,6 +210,12 @@ class BrowserFragment : Fragment(), BackHandler {
             owner = this,
             view = view
         )
+
+        thumbnailsFeature.set(
+            feature = ThumbnailsFeature(requireContext(), view.engineView, requireComponents.core.sessionManager),
+            owner = this,
+            view = view
+        )
     }
 
     override fun onResume() {
@@ -256,6 +265,10 @@ class BrowserFragment : Fragment(), BackHandler {
         promptsFeature.withFeature { it.onActivityResult(requestCode, resultCode, data) }
     }
 
+    override fun onTrimMemory(level: Int) {
+        requireComponents.core.sessionManager.onLowMemory()
+    }
+
     // This method triggers the complexity warning. However it's actually not that hard to understand.
     @SuppressWarnings("ComplexMethod")
     private fun handleToolbarItemInteraction(action: SearchAction.ToolbarMenuItemTapped) {

app/src/main/java/org/mozilla/fenix/home/tabs/TabsAdapter.kt

@@ -124,8 +124,12 @@ class TabsAdapter(private val actionEmitter: Observer<TabsAction>) :
         }
 
         fun updateTabBackground(id: Int) {
-            val background = availableBackgrounds[id % availableBackgrounds.size]
-            tab_background.image = ContextCompat.getDrawable(view.context, background)
+            if (session?.thumbnail != null) {
+                tab_background.setImageBitmap(session?.thumbnail)
+            } else {
+                val background = availableBackgrounds[id % availableBackgrounds.size]
+                tab_background.image = ContextCompat.getDrawable(view.context, background)
+            }
         }
 
         companion object {

app/src/main/java/org/mozilla/fenix/home/tabs/TabsComponent.kt

@@ -4,6 +4,7 @@
 
 package org.mozilla.fenix.home.tabs
 
+import android.graphics.Bitmap
 import android.view.ViewGroup
 import androidx.recyclerview.widget.RecyclerView
 import kotlinx.android.synthetic.main.component_tabs.view.*
@@ -41,10 +42,10 @@ class TabsComponent(
 }
 
 data class TabsState(val sessions: List<SessionViewState>) : ViewState
-data class SessionViewState(val id: String, val url: String, val selected: Boolean)
+data class SessionViewState(val id: String, val url: String, val selected: Boolean, val thumbnail: Bitmap? = null)
 
 fun Session.toSessionViewState(selected: Boolean): SessionViewState {
-    return SessionViewState(this.id, this.url, selected)
+    return SessionViewState(this.id, this.url, selected, this.thumbnail)
 }
 
 sealed class TabsAction : Action {