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/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 {