desktop: wire in API into desktop client

desktop/src/jvmMain/kotlin/Paging.kt

@@ -0,0 +1,31 @@
+import androidx.paging.PagingConfig
+import androidx.paging.cachedIn
+import com.kuuurt.paging.multiplatform.Pager
+import com.kuuurt.paging.multiplatform.PagingResult
+import kotlinx.coroutines.CoroutineScope
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.FlowPreview
+
+@OptIn(FlowPreview::class, ExperimentalCoroutinesApi::class)
+class Paging(
+  private val coroutineScope: CoroutineScope,
+) {
+  private val api = Api()
+  private val pager =
+    Pager(
+      clientScope = coroutineScope,
+      config = PagingConfig(20),
+      initialKey = 1,
+      getItems = { currentKey, _ ->
+        val items = api.api.getHottestPosts(currentKey)
+        PagingResult(
+          items = items,
+          currentKey = currentKey,
+          prevKey = { if (currentKey == 1) null else currentKey - 1 },
+          nextKey = { currentKey + 1 },
+        )
+      }
+    )
+  val pagingData
+    get() = pager.pagingData.cachedIn(coroutineScope)
+}