feat: Support "Trending posts"

- Implement the trending posts API
- Display trending statuses as a new Timeline kind
- Allow the user to add trending statuses to a dedicated tab
- Always show the "Trending" option in the navigation menu

app/src/main/java/com/keylesspalace/tusky/TabData.kt

@@ -36,6 +36,7 @@ const val FEDERATED = "Federated"
 const val DIRECT = "Direct"
 const val TRENDING_TAGS = "TrendingTags"
 const val TRENDING_LINKS = "TrendingLinks"
+const val TRENDING_STATUSES = "TrendingStatuses"
 const val HASHTAG = "Hashtag"
 const val LIST = "List"
 const val BOOKMARKS = "Bookmarks"
@@ -107,6 +108,12 @@ fun createTabDataFromId(id: String, arguments: List<String> = emptyList()): TabD
             icon = R.drawable.ic_trending_up_24px,
             fragment = { TrendingLinksFragment.newInstance() }
         )
+        TRENDING_STATUSES -> TabData(
+            id = TRENDING_STATUSES,
+            text = R.string.title_public_trending_statuses,
+            icon = R.drawable.ic_trending_up_24px,
+            fragment = { TimelineFragment.newInstance(TimelineViewModel.Kind.TRENDING_STATUSES) }
+        )
         HASHTAG -> TabData(
             id = HASHTAG,
             text = R.string.hashtags,

app/src/main/java/com/keylesspalace/tusky/TabPreferenceActivity.kt

@@ -386,6 +386,9 @@ class TabPreferenceActivity : BaseActivity(), Injectable, ItemInteractionListene
         if (!currentTabs.contains(trendingLinksTab)) {
             addableTabs.add(trendingLinksTab)
         }
+        createTabDataFromId(TRENDING_STATUSES).apply {
+            currentTabs.contains(this) || addableTabs.add(this)
+        }
         val bookmarksTab = createTabDataFromId(BOOKMARKS)
         if (!currentTabs.contains(trendingTagsTab)) {
             addableTabs.add(bookmarksTab)

app/src/main/java/com/keylesspalace/tusky/components/timeline/TimelineFragment.kt

@@ -549,7 +549,8 @@ class TimelineFragment :
             TimelineViewModel.Kind.FAVOURITES,
             TimelineViewModel.Kind.LIST,
             TimelineViewModel.Kind.BOOKMARKS,
-            TimelineViewModel.Kind.USER_PINNED -> return
+            TimelineViewModel.Kind.USER_PINNED,
+            TimelineViewModel.Kind.TRENDING_STATUSES -> return
         }
     }
 
@@ -562,6 +563,7 @@ class TimelineFragment :
         return viewModel.kind != TimelineViewModel.Kind.TAG &&
             viewModel.kind != TimelineViewModel.Kind.FAVOURITES &&
             viewModel.kind != TimelineViewModel.Kind.BOOKMARKS &&
+            viewModel.kind != TimelineViewModel.Kind.TRENDING_STATUSES &&
             activity is ActionButtonActivity
     }
 

app/src/main/java/com/keylesspalace/tusky/components/timeline/viewmodel/NetworkTimelineViewModel.kt

@@ -308,6 +308,7 @@ class NetworkTimelineViewModel @Inject constructor(
             Kind.FAVOURITES -> api.favourites(fromId, uptoId, limit)
             Kind.BOOKMARKS -> api.bookmarks(fromId, uptoId, limit)
             Kind.LIST -> api.listTimeline(id!!, fromId, uptoId, limit)
+            Kind.TRENDING_STATUSES -> api.trendingStatuses()
         }
     }
 

app/src/main/java/com/keylesspalace/tusky/components/timeline/viewmodel/TimelineViewModel.kt

@@ -321,7 +321,7 @@ abstract class TimelineViewModel(
     }
 
     enum class Kind {
-        HOME, PUBLIC_LOCAL, PUBLIC_FEDERATED, TAG, USER, USER_PINNED, USER_WITH_REPLIES, FAVOURITES, LIST, BOOKMARKS;
+        HOME, PUBLIC_LOCAL, PUBLIC_FEDERATED, TAG, USER, USER_PINNED, USER_WITH_REPLIES, FAVOURITES, LIST, BOOKMARKS, TRENDING_STATUSES;
 
         fun toFilterKind(): Filter.Kind {
             return when (valueOf(name)) {

app/src/main/java/com/keylesspalace/tusky/components/trending/TrendingActivity.kt

@@ -30,8 +30,10 @@ import androidx.fragment.app.Fragment
 import androidx.fragment.app.FragmentActivity
 import androidx.viewpager2.adapter.FragmentStateAdapter
 import com.google.android.material.tabs.TabLayoutMediator
-import com.keylesspalace.tusky.BaseActivity
+import com.keylesspalace.tusky.BottomSheetActivity
 import com.keylesspalace.tusky.R
+import com.keylesspalace.tusky.components.timeline.TimelineFragment
+import com.keylesspalace.tusky.components.timeline.viewmodel.TimelineViewModel
 import com.keylesspalace.tusky.databinding.ActivityTrendingBinding
 import com.keylesspalace.tusky.util.reduceSwipeSensitivity
 import com.keylesspalace.tusky.util.viewBinding
@@ -39,7 +41,7 @@ import dagger.android.DispatchingAndroidInjector
 import dagger.android.HasAndroidInjector
 import javax.inject.Inject
 
-class TrendingActivity : BaseActivity(), HasAndroidInjector, MenuProvider {
+class TrendingActivity : BottomSheetActivity(), HasAndroidInjector, MenuProvider {
 
     @Inject
     lateinit var dispatchingAndroidInjector: DispatchingAndroidInjector<Any>
@@ -93,12 +95,13 @@ class TrendingActivity : BaseActivity(), HasAndroidInjector, MenuProvider {
 }
 
 class TrendingFragmentAdapter(val activity: FragmentActivity) : FragmentStateAdapter(activity) {
-    override fun getItemCount() = 2
+    override fun getItemCount() = 3
 
     override fun createFragment(position: Int): Fragment {
         return when (position) {
             0 -> TrendingTagsFragment.newInstance()
             1 -> TrendingLinksFragment.newInstance()
+            2 -> TimelineFragment.newInstance(TimelineViewModel.Kind.TRENDING_STATUSES)
             else -> throw IllegalStateException()
         }
     }
@@ -107,6 +110,7 @@ class TrendingFragmentAdapter(val activity: FragmentActivity) : FragmentStateAda
         return when (position) {
             0 -> activity.getString(R.string.title_tab_public_trending_hashtags)
             1 -> activity.getString(R.string.title_tab_public_trending_links)
+            2 -> activity.getString(R.string.title_tab_public_trending_statuses)
             else -> throw IllegalStateException()
         }
     }

app/src/main/java/com/keylesspalace/tusky/network/MastodonApi.kt

@@ -789,4 +789,7 @@ interface MastodonApi {
 
     @GET("api/v1/trends/links")
     suspend fun trendingLinks(): NetworkResult<List<TrendsLink>>
+
+    @GET("api/v1/trends/statuses")
+    suspend fun trendingStatuses(): Response<List<Status>>
 }

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

@@ -53,10 +53,12 @@
     <string name="title_notifications">Notifications</string>
     <string name="title_public_local">Local</string>
     <string name="title_public_trending">Trending</string>
-    <string name="title_public_trending_hashtags">Trending Hashtags</string>
+    <string name="title_public_trending_hashtags">Trending hashtags</string>
-    <string name="title_public_trending_links">Trending Links</string>
+    <string name="title_public_trending_links">Trending links</string>
+    <string name="title_public_trending_statuses">Trending posts</string>
     <string name="title_tab_public_trending_hashtags">Hashtags</string>
     <string name="title_tab_public_trending_links">Links</string>
+    <string name="title_tab_public_trending_statuses">Posts</string>
     <string name="title_public_federated">Federated</string>
     <string name="title_direct_messages">Direct messages</string>
     <string name="title_tab_preferences">Tabs</string>