tv: hook up isFocused as observable property

This is kind of ridiculous, since the items own state should clearly be
queryable, but it doesn't appear to be the case here, so just shuffle it
around into kotlin and back.

Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>

ui/src/main/java/com/wireguard/android/activity/TvMainActivity.kt

@@ -79,6 +79,10 @@ class TvMainActivity : AppCompatActivity() {
         binding.rowConfigurationHandler = object : ObservableKeyedRecyclerViewAdapter.RowConfigurationHandler<TvTunnelListItemBinding, ObservableTunnel> {
             override fun onConfigureRow(binding: TvTunnelListItemBinding, item: ObservableTunnel, position: Int) {
                 binding.isDeleting = isDeleting
+                binding.isFocused = ObservableBoolean()
+                binding.root.setOnFocusChangeListener { _, focused ->
+                    binding.isFocused?.set(focused)
+                }
                 binding.root.setOnClickListener {
                     lifecycleScope.launch {
                         if (isDeleting.get()) {

ui/src/main/res/layout/tv_tunnel_list_item.xml

@@ -15,6 +15,10 @@
             name="isDeleting"
             type="androidx.databinding.ObservableBoolean" />
 
+        <variable
+            name="isFocused"
+            type="androidx.databinding.ObservableBoolean" />
+
         <variable
             name="key"
             type="String" />
@@ -24,16 +28,15 @@
             type="com.wireguard.android.model.ObservableTunnel" />
     </data>
 
-    <!-- Rather than changing the background tint to red for deleting mode, it should instead just change the selection color -->
     <com.google.android.material.card.MaterialCardView
         android:layout_width="225dp"
         android:layout_height="110dp"
         android:layout_margin="8dp"
         android:layout_marginTop="4dp"
         android:layout_marginBottom="0dp"
-        android:backgroundTint="@{isDeleting ? @color/error_tag_color : item.state == State.UP ? @color/secondary_dark_color : @color/tv_card_background}"
         android:checkable="true"
         android:focusable="true"
+        android:backgroundTint="@{(item.state == State.UP &amp;&amp; !isDeleting) ? @color/secondary_dark_color : (isDeleting &amp;&amp; isFocused) ? @color/tv_card_delete_background : @color/tv_card_background}"
         app:contentPadding="8dp">
 
         <androidx.constraintlayout.widget.ConstraintLayout
@@ -61,13 +64,12 @@
                 app:layout_constraintStart_toStartOf="parent"
                 tools:text="rx: 200 MB, tx: 100 MB" />
 
-            <!-- TODO: replace the "&amp;&amp; true" stuff with && isSelected() -->
             <com.google.android.material.textview.MaterialTextView
                 android:id="@+id/tunnel_delete"
                 android:layout_width="wrap_content"
                 android:layout_height="wrap_content"
                 android:text="@string/tv_delete"
-                android:visibility="@{isDeleting &amp;&amp; true ? View.VISIBLE : View.GONE}"
+                android:visibility="@{(isDeleting &amp;&amp; isFocused) ? View.VISIBLE : View.GONE}"
                 app:layout_constraintBottom_toBottomOf="parent"
                 app:layout_constraintStart_toStartOf="parent"
                 tools:visibility="gone" />

ui/src/main/res/values/tv_colors.xml

@@ -2,4 +2,5 @@
 <resources>
     <color name="tv_primary_color">#ff212121</color>
     <color name="tv_card_background">@color/tv_primary_color</color>
+    <color name="tv_card_delete_background">#b00020</color>
 </resources>