新增趋势动态功能

实现了趋势动态功能，包括前端和后端支持。允许用户查看和获取趋势动态。

app/src/main/java/com/aiosman/riderpro/data/MomentService.kt

@@ -112,13 +112,15 @@ interface MomentService {
      * @param author 作者ID,过滤条件
      * @param timelineId 用户时间线ID,指定用户 ID 的时间线
      * @param contentSearch 内容搜索,过滤条件
+     * @param trend 是否趋势动态
      * @return 动态列表
      */
     suspend fun getMoments(
         pageNumber: Int,
         author: Int? = null,
         timelineId: Int? = null,
-        contentSearch: String? = null
+        contentSearch: String? = null,
+        trend: Boolean? = false
     ): ListContainer<MomentEntity>
 
     /**

app/src/main/java/com/aiosman/riderpro/data/api/RiderProAPI.kt

@@ -102,6 +102,7 @@ interface RiderProAPI {
         @Query("authorId") authorId: Int? = null,
         @Query("contentSearch") contentSearch: String? = null,
         @Query("postUser") postUser: Int? = null,
+        @Query("trend") trend: String? = null,
     ): Response<ListContainer<Moment>>
 
     @Multipart

app/src/main/java/com/aiosman/riderpro/entity/Moment.kt

@@ -24,7 +24,8 @@ class MomentPagingSource(
     private val remoteDataSource: MomentRemoteDataSource,
     private val author: Int? = null,
     private val timelineId: Int? = null,
-    private val contentSearch: String? = null
+    private val contentSearch: String? = null,
+    private val trend: Boolean? = false
 ) : PagingSource<Int, MomentEntity>() {
     override suspend fun load(params: LoadParams<Int>): LoadResult<Int, MomentEntity> {
         return try {
@@ -33,7 +34,8 @@ class MomentPagingSource(
                 pageNumber = currentPage,
                 author = author,
                 timelineId = timelineId,
-                contentSearch = contentSearch
+                contentSearch = contentSearch,
+                trend = trend
             )
 
             LoadResult.Page(
@@ -59,9 +61,16 @@ class MomentRemoteDataSource(
         pageNumber: Int,
         author: Int?,
         timelineId: Int?,
-        contentSearch: String?
+        contentSearch: String?,
+        trend: Boolean?
     ): ListContainer<MomentEntity> {
-        return momentService.getMoments(pageNumber, author, timelineId, contentSearch)
+        return momentService.getMoments(
+            pageNumber = pageNumber,
+            author = author,
+            timelineId = timelineId,
+            contentSearch = contentSearch,
+            trend = trend
+        )
     }
 }
 
@@ -72,9 +81,16 @@ class MomentServiceImpl() : MomentService {
         pageNumber: Int,
         author: Int?,
         timelineId: Int?,
-        contentSearch: String?
+        contentSearch: String?,
+        trend: Boolean?
     ): ListContainer<MomentEntity> {
-        return momentBackend.fetchMomentItems(pageNumber, author, timelineId, contentSearch)
+        return momentBackend.fetchMomentItems(
+            pageNumber = pageNumber,
+            author = author,
+            timelineId = timelineId,
+            contentSearch = contentSearch,
+            trend = trend
+        )
     }
 
     override suspend fun getMomentById(id: Int): MomentEntity {
@@ -115,14 +131,16 @@ class MomentBackend {
         pageNumber: Int,
         author: Int? = null,
         timelineId: Int?,
-        contentSearch: String?
+        contentSearch: String?,
+        trend: Boolean?
     ): ListContainer<MomentEntity> {
         val resp = ApiClient.api.getPosts(
             pageSize = DataBatchSize,
             page = pageNumber,
             timelineId = timelineId,
             authorId = author,
-            contentSearch = contentSearch
+            contentSearch = contentSearch,
+            trend = if (trend == true) "true" else ""
         )
         val body = resp.body() ?: throw ServiceException("Failed to get moments")
         return ListContainer(

app/src/main/java/com/aiosman/riderpro/ui/index/tabs/search/DiscoverScreen.kt

@@ -24,13 +24,21 @@ import androidx.compose.foundation.shape.RoundedCornerShape
 import androidx.compose.foundation.text.BasicTextField
 import androidx.compose.foundation.text.KeyboardActions
 import androidx.compose.foundation.text.KeyboardOptions
+import androidx.compose.material.ExperimentalMaterialApi
 import androidx.compose.material.Icon
 import androidx.compose.material.Text
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Search
+import androidx.compose.material.pullrefresh.PullRefreshIndicator
+import androidx.compose.material.pullrefresh.pullRefresh
+import androidx.compose.material.pullrefresh.rememberPullRefreshState
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
 import androidx.compose.runtime.rememberCoroutineScope
+import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.clip
@@ -52,7 +60,7 @@ import com.aiosman.riderpro.ui.post.PostViewModel
 import com.google.accompanist.systemuicontroller.rememberSystemUiController
 
 
-@OptIn(ExperimentalFoundationApi::class)
+@OptIn(ExperimentalFoundationApi::class, ExperimentalMaterialApi::class)
 @Preview
 @Composable
 fun DiscoverScreen() {
@@ -66,11 +74,16 @@ fun DiscoverScreen() {
     LaunchedEffect(Unit) {
         systemUiController.setStatusBarColor(Color.Transparent, darkIcons = true)
     }
+    var refreshing by remember { mutableStateOf(false) }
+    val state = rememberPullRefreshState(refreshing, onRefresh = {
+        model.refreshPager()
+    })
 
     Column(
         modifier = Modifier
             .background(Color.White)
             .fillMaxSize()
+            .pullRefresh(state)
             .padding(bottom = navigationBarPaddings)
     ) {
         Spacer(modifier = Modifier.height(statusBarPaddingValues.calculateTopPadding()))
@@ -89,9 +102,8 @@ fun DiscoverScreen() {
                 .weight(1f)
         ) {
             DiscoverView()
+            PullRefreshIndicator(refreshing, state, Modifier.align(Alignment.TopCenter))
         }
-
-
     }
 }
 

app/src/main/java/com/aiosman/riderpro/ui/index/tabs/search/DiscoverViewModel.kt

@@ -11,6 +11,7 @@ import com.aiosman.riderpro.entity.MomentEntity
 import com.aiosman.riderpro.entity.MomentPagingSource
 import com.aiosman.riderpro.entity.MomentRemoteDataSource
 import com.aiosman.riderpro.entity.MomentServiceImpl
+import com.aiosman.riderpro.ui.index.tabs.moment.MomentViewModel.accountService
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.asStateFlow
 import kotlinx.coroutines.flow.collectLatest
@@ -28,6 +29,23 @@ object DiscoverViewModel:ViewModel() {
                 pagingSourceFactory = {
                     MomentPagingSource(
                         MomentRemoteDataSource(momentService),
+                        trend = true
+                    )
+                }
+            ).flow.cachedIn(viewModelScope).collectLatest {
+                _discoverMomentsFlow.value = it
+            }
+        }
+    }
+    fun refreshPager() {
+        viewModelScope.launch {
+            val profile = accountService.getMyAccountProfile()
+            Pager(
+                config = PagingConfig(pageSize = 5, enablePlaceholders = false),
+                pagingSourceFactory = {
+                    MomentPagingSource(
+                        MomentRemoteDataSource(momentService),
+                        trend = true
                     )
                 }
             ).flow.cachedIn(viewModelScope).collectLatest {