For #1574: Cleans up unused code and refactors

app/src/main/java/org/mozilla/fenix/home/HomeFragment.kt

@@ -395,7 +395,6 @@ class HomeFragment : Fragment(), CoroutineScope {
 
     private fun subscribeToTabCollections(): Observer<List<TabCollection>> {
         val observer = Observer<List<TabCollection>> {
-            // TODO is it bad to be caching like this?
             requireComponents.core.tabCollectionStorage.cachedTabCollections = it
             getManagedEmitter<SessionControlChange>().onNext(SessionControlChange.CollectionsChange(it))
         }

app/src/main/java/org/mozilla/fenix/home/sessioncontrol/viewholders/CollectionViewHolder.kt

@@ -26,7 +26,6 @@ import org.mozilla.fenix.home.sessioncontrol.CollectionAction
 import org.mozilla.fenix.home.sessioncontrol.SessionControlAction
 import org.mozilla.fenix.home.sessioncontrol.TabCollection
 import org.mozilla.fenix.home.sessioncontrol.onNext
-import org.mozilla.fenix.utils.Settings
 import kotlin.coroutines.CoroutineContext
 
 class CollectionViewHolder(
@@ -42,7 +41,6 @@ class CollectionViewHolder(
 
     private lateinit var collection: TabCollection
     private var expanded = false
-    private var state = CollectionState.Collapsed
     private var collectionMenu: CollectionItemMenu
 
     init {
@@ -70,20 +68,17 @@ class CollectionViewHolder(
         }
 
         view.setOnClickListener {
-            updateState()
+            handleExpansion(expanded)
         }
-
-        view.collection_icon.setColorFilter(ContextCompat.getColor(
-            view.context,
-            getNextIconColor()),
-            android.graphics.PorterDuff.Mode.SRC_IN
-        )
     }
 
     fun bindSession(collection: TabCollection, expanded: Boolean) {
         this.collection = collection
         this.expanded = expanded
         updateCollectionUI()
+
+        // See #2625 for why we're invalidating
+        view.invalidate()
     }
 
     private fun updateCollectionUI() {
@@ -104,7 +99,8 @@ class CollectionViewHolder(
         var tabsDisplayed = 0
         val tabTitlesList = hostNameList.joinToString(", ") {
             if (it.length > maxTitleLength) {
-                it.substring(0,
+                it.substring(
+                    0,
                     maxTitleLength
                 ) + "..."
             } else {
@@ -127,56 +123,43 @@ class CollectionViewHolder(
             view.collection_description.visibility = View.VISIBLE
             view.expand_button.setImageDrawable(ContextCompat.getDrawable(view.context, R.drawable.ic_chevron_down))
         }
+
+        view.collection_icon.setColorFilter(
+            ContextCompat.getColor(
+                view.context,
+                getIconColor(collection.id)
+            ),
+            android.graphics.PorterDuff.Mode.SRC_IN
+        )
     }
 
-    private fun updateState() {
-        state = when (state) {
-            CollectionState.Expanded -> {
-                actionEmitter.onNext(CollectionAction.Collapse(collection))
-                CollectionState.Collapsed
-            }
-            CollectionState.Collapsed -> {
-                actionEmitter.onNext(CollectionAction.Expand(collection))
-                CollectionState.Expanded
-            }
+    private fun handleExpansion(isExpanded: Boolean) {
+        if (isExpanded) {
+            actionEmitter.onNext(CollectionAction.Collapse(collection))
+        } else {
+            actionEmitter.onNext(CollectionAction.Expand(collection))
         }
     }
 
     @Suppress("ComplexMethod", "MagicNumber")
-    private fun getNextIconColor(): Int {
-        with(view.context) {
-            var sessionColorIndex = Settings.getInstance(this).preferences
-                .getInt(getString(R.string.pref_key_collection_color), 0)
-
-            val iconResource = when (sessionColorIndex) {
-                0 -> R.color.collection_icon_color_violet
-                1 -> R.color.collection_icon_color_blue
-                2 -> R.color.collection_icon_color_pink
-                3 -> R.color.collection_icon_color_green
-                4 -> R.color.collection_icon_color_yellow
-                else -> R.color.white_color
-            }
-
-            if (sessionColorIndex >= MAX_COLOR_INDEX) { sessionColorIndex = 0 } else { sessionColorIndex += 1 }
-
-            Settings.getInstance(this).preferences.edit()
-                .putInt(getString(R.string.pref_key_collection_color), sessionColorIndex).apply()
-
-            return iconResource
+    private fun getIconColor(id: Long): Int {
+        val sessionColorIndex = (id % 4).toInt()
+        return when (sessionColorIndex) {
+            0 -> R.color.collection_icon_color_violet
+            1 -> R.color.collection_icon_color_blue
+            2 -> R.color.collection_icon_color_pink
+            3 -> R.color.collection_icon_color_green
+            4 -> R.color.collection_icon_color_yellow
+            else -> R.color.white_color
         }
     }
 
     companion object {
-        const val MAX_COLOR_INDEX = 4
         const val EXPANDED_PADDING = 60
         const val COLLAPSED_MARGIN = 12
         const val LAYOUT_ID = R.layout.collection_home_list_row
         const val maxTitleLength = 20
     }
-
-    enum class CollectionState {
-        Expanded, Collapsed
-    }
 }
 
 class CollectionItemMenu(

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

@@ -43,7 +43,6 @@
         android:id="@+id/collections_list"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:elevation="5dp"
         android:visibility="gone"
         app:layout_constraintBottom_toTopOf="@id/add_collection_button"
         app:layout_constraintEnd_toEndOf="parent"
@@ -54,7 +53,6 @@
         android:id="@+id/add_collection_button"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:elevation="5dp"
         android:background="?foundation"
         android:drawableStart="@drawable/ic_new"
         android:drawablePadding="14dp"
@@ -103,11 +101,9 @@
         android:id="@+id/tab_list"
         android:layout_width="0dp"
         android:layout_height="0dp"
-        android:elevation="0dp"
         android:layout_marginStart="16dp"
         android:layout_marginTop="16dp"
         android:layout_marginEnd="16dp"
-        android:requiresFadingEdge="vertical"
         app:layout_constraintBottom_toTopOf="@id/add_tabs_layout"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"

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

@@ -45,8 +45,8 @@
         android:id="@+id/collections_list"
         android:layout_width="match_parent"
         android:layout_height="0dp"
-        app:layout_constraintTop_toBottomOf="parent"
-        app:layout_constraintBottom_toBottomOf="parent" />
+        android:visibility="gone"
+        app:layout_constraintBottom_toTopOf="@+id/add_collection_button" />
 
     <TextView
         android:id="@+id/add_collection_button"
@@ -62,8 +62,8 @@
         android:text="@string/create_collection_add_new_collection"
         android:textColor="?primaryText"
         android:textSize="16sp"
-        app:layout_constraintTop_toBottomOf="parent"
-        app:layout_constraintBottom_toBottomOf="parent"
+        android:visibility="gone"
+        app:layout_constraintBottom_toTopOf="@id/divider"
         tools:targetApi="m" />
 
     <View

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

@@ -45,7 +45,6 @@
         android:id="@+id/collections_list"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:elevation="5dp"
         android:alpha="1"
         android:background="?foundation"
         android:visibility="visible"
@@ -57,7 +56,6 @@
         android:id="@+id/add_collection_button"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
-        android:elevation="5dp"
         android:alpha="1"
         android:background="?foundation"
         android:drawableStart="@drawable/ic_new"
@@ -107,7 +105,6 @@
 
     <androidx.recyclerview.widget.RecyclerView
         android:id="@+id/tab_list"
-        android:elevation="0dp"
         android:layout_width="0dp"
         android:layout_height="0dp"
         android:layout_marginStart="16dp"
@@ -115,7 +112,7 @@
         android:layout_marginEnd="16dp"
         android:fadingEdgeLength="30dp"
         android:requiresFadingEdge="vertical"
-        app:layout_constraintBottom_toTopOf="@id/add_collection_button"
+        app:layout_constraintBottom_toTopOf="@id/collections_list"
         app:layout_constraintEnd_toEndOf="parent"
         app:layout_constraintStart_toStartOf="parent"
         app:layout_constraintTop_toBottomOf="@id/back_button" />

app/src/main/res/values/preference_keys.xml

@@ -67,6 +67,4 @@
     <string name="pref_key_tracking_protection_settings" translatable="false">pref_key_tracking_protection_settings</string>
     <string name="pref_key_tracking_protection" translatable="false">pref_key_tracking_protection</string>
     <string name="pref_key_tracking_protection_exceptions" translatable="false">pref_key_tracking_protection_exceptions</string>
-
-    <string name="pref_key_collection_color" translatable="false">pref_key_collection_color</string>
 </resources>