社团列表

app/src/main/java/com/gyf/csams/ui/MainActivity.kt

@@ -15,6 +15,7 @@ import androidx.compose.material.*
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.getValue
 import androidx.compose.runtime.livedata.observeAsState
+import androidx.compose.runtime.rememberCoroutineScope
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.draw.rotate
@@ -37,6 +38,8 @@ import com.gyf.csams.ui.model.CommunityDto
 import com.gyf.csams.ui.model.ListViewModel
 import com.gyf.csams.ui.model.MarqueeViewModel
 import com.gyf.csams.ui.theme.CSAMSTheme
+import com.orhanobut.logger.Logger
+import kotlinx.coroutines.launch
 
 
 /**
@@ -68,6 +71,23 @@ fun Body() {
                 }
                 composable(MainMenu.List.name) {
                     CommunityList(navController = navController)
+
+                    val model:ListViewModel= viewModel()
+                    val snackBarMsg:String by model.snackBarMsg.observeAsState("")
+
+                    if(snackBarMsg!=""){
+                        val scope= rememberCoroutineScope()
+                        scope.launch {
+                            val result=scaffoldState.snackbarHostState.showSnackbar(
+                                message = snackBarMsg
+                            )
+                            model.reset()
+                        }
+//                        scope.launch {
+//                            delay(1000)
+//                            scaffoldState.snackbarHostState.currentSnackbarData?.dismiss()
+//                        }
+                    }
                 }
                 composable(MainMenu.Center.name) {
                     Box(modifier = Modifier.fillMaxSize()) {
@@ -187,6 +207,8 @@ fun CommunityListBody(model: ListViewModel = viewModel()) {
     val communityList: MutableList<CommunityDto>? by model.communityDto.observeAsState()
     val listState = rememberLazyListState()
 
+//    Text(text ="communityList.size=${communityList?.size}")
+    
     LazyColumn(state = listState)  {
         communityList?.chunked(2)?.forEach {
             item{
@@ -212,9 +234,15 @@ fun CommunityListBody(model: ListViewModel = viewModel()) {
                     .height(10.dp))
             }
         }
-
     }
-    if(listState.firstVisibleItemIndex>0){
+    Logger.i("totalItemsCount=${listState.layoutInfo.totalItemsCount}" +
+            ",firstVisibleItemIndex=${listState.firstVisibleItemIndex}," +
+            "firstVisibleItemScrollOffset=${listState.firstVisibleItemScrollOffset}," +
+            "viewportStartOffset=${listState.layoutInfo.viewportStartOffset}" +
+            "viewportEndOffset=${listState.layoutInfo.viewportEndOffset}")
+
+
+    if(listState.layoutInfo.totalItemsCount-listState.firstVisibleItemIndex==4){
         model.addMore()
     }
 }

app/src/main/java/com/gyf/csams/ui/model/ViewModel.kt

@@ -71,17 +71,19 @@ class CarouselViewModel:ViewModel(){
 data class CommunityDto(val name:String)
 
 class ListViewModel:ViewModel(){
-    private val _name=MutableLiveData<String>()
+    private val _name=MutableLiveData("")
     val name:LiveData<String> = _name
     val nameDesc="社团名称"
     val namePlaceholder="请输入$nameDesc"
 
-    private val _desc=MutableLiveData<String>()
+    private val _desc=MutableLiveData("")
     val desc:LiveData<String> = _desc
     val descDesc="社团简介"
     val descPlaceholder="请输入$descDesc"
 
-
+    //注册请求响应信息
+    private val _snackBarMsg=MutableLiveData<String>()
+    val snackBarMsg:LiveData<String> = _snackBarMsg
 
     //社团列表
     private val _communityList=MutableLiveData<MutableList<CommunityDto>>(mutableListOf())
@@ -101,6 +103,7 @@ class ListViewModel:ViewModel(){
 
     fun search(){
         Logger.i("使用社团名称：${_name.value}和社团简介${_desc.value}搜索社团")
+        _snackBarMsg.value="搜索失败，请联系管理员"
     }
 
     /**
@@ -111,36 +114,48 @@ class ListViewModel:ViewModel(){
 
         viewModelScope.launch {
             _communityList.value?.apply {
-                repeat(2
+                repeat(10
                 ) {
-                    add(CommunityDto(name = "羽毛球社"))
+                    add(CommunityDto(name = "社团${_communityList.value?.size}"))
-                    add(CommunityDto(name = "篮球社"))
-                    add(CommunityDto(name = "足球社"))
-                    add(CommunityDto(name = "桌游社"))
-                    add(CommunityDto(name = "乒乓球社"))
                 }
 
             }
-
+            Logger.i("初始化社团列表size=${_communityList.value?.size}")
-            Logger.i("初始化社团size=${_communityList.value?.size}")
         }
 
     }
 
+
+
     /**
      * 加载更多社团列表
      *
      */
     fun addMore(){
         viewModelScope.launch {
-            Logger.i("加载更多")
+            val c = _communityList.value
-            _communityList.value?.apply {
+
-                add(CommunityDto(name = "羽毛球社"))
+            if(c!=null){
-                add(CommunityDto(name = "篮球社"))
+                val t=mutableListOf<CommunityDto>()
-                add(CommunityDto(name = "足球社"))
+                t.addAll(c)
-                add(CommunityDto(name = "桌游社"))
+                t.apply {
-                add(CommunityDto(name = "乒乓球社"))
+                    repeat(10
+                    ) {
+                        add(CommunityDto(name = "社团${t.size}"))
                     }
                 }
+                Logger.i("t.size=${t.size}")
+                _communityList.postValue(t)
+                Logger.i("加载更多社团size=${_communityList.value?.size}")
+                _snackBarMsg.value="成功加载更多社团"
+            }
+
+
+        }
+
+    }
+
+    fun reset(){
+        _snackBarMsg.value=""
     }
 }