fix: 小屏幕中编辑器 FAB 会挡住内容

app/src/main/kotlin/cn/super12138/todo/ui/pages/editor/TodoEditorPage.kt

@@ -11,10 +11,12 @@ import androidx.compose.animation.fadeOut
 import androidx.compose.animation.shrinkVertically
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Row
+import androidx.compose.foundation.layout.Spacer
 import androidx.compose.foundation.layout.fillMaxSize
 import androidx.compose.foundation.layout.fillMaxWidth
 import androidx.compose.foundation.layout.imePadding
 import androidx.compose.foundation.layout.padding
+import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.lazy.LazyColumn
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.automirrored.outlined.Undo
@@ -255,6 +257,10 @@ fun TodoEditorPage(
                     }
                 }
             }
+
+            item {
+                Spacer(modifier = Modifier.size(80.dp))
+            }
         }
 
         ConfirmDialog(

app/src/main/kotlin/cn/super12138/todo/ui/pages/main/MainPage.kt

@@ -58,22 +58,20 @@ fun MainPage(
     var showDeleteConfirmDialog by rememberSaveable { mutableStateOf(false) }
 
     val selectedTodoIds by remember { derivedStateOf { selectedTodos.value } }
-    val isSelectedIdsEmpty by remember { derivedStateOf { selectedTodoIds.isEmpty() } }
+    val inSelectedMode by remember { derivedStateOf { !selectedTodoIds.isEmpty() } }
     val toDoList by remember { derivedStateOf { toDos.value } }
     val totalTasks by remember { derivedStateOf { toDoList.size } }
     val completedTasks by remember { derivedStateOf { toDoList.count { it.isCompleted } } }
-    val filteredTodoList =  if (showCompleted) toDoList else toDoList.filter { item -> !item.isCompleted }
+    val filteredTodoList = if (showCompleted) toDoList else toDoList.filter { item -> !item.isCompleted }
 
-    BackHandler(enabled = !isSelectedIdsEmpty) {
-        // 当按下返回键（或进行返回操作）时清空选择
-        viewModel.clearAllTodoSelection()
-    }
+    // 当按下返回键（或进行返回操作）时清空选择，仅在非选择模式下生效
+    BackHandler(inSelectedMode) { viewModel.clearAllTodoSelection() }
 
     Scaffold(
         topBar = {
             TodoTopAppBar(
                 selectedTodoIds = selectedTodoIds,
-                selectedMode = !isSelectedIdsEmpty,
+                selectedMode = inSelectedMode,
                 onCancelSelect = { viewModel.clearAllTodoSelection() },
                 onSelectAll = { viewModel.selectAllTodos() },
                 onDeleteSelectedTodo = { showDeleteConfirmDialog = true },
@@ -83,7 +81,7 @@ fun MainPage(
         floatingActionButton = {
             with(sharedTransitionScope) {
                 AnimatedVisibility(
-                    visible = isSelectedIdsEmpty,
+                    visible = inSelectedMode,
                     enter = fadeIn() + expandIn(),
                     exit = shrinkOut() + fadeOut()
                 ) {
@@ -120,11 +118,11 @@ fun MainPage(
                     state = listState,
                     list = filteredTodoList,
                     onItemClick = { item ->
-                        if (isSelectedIdsEmpty) {
+                        if (inSelectedMode) {
+                            viewModel.toggleTodoSelection(item)
+                        } else {
                             viewModel.setEditTodoItem(item)
                             toTodoEditPage()
-                        } else {
-                            viewModel.toggleTodoSelection(item)
                         }
                     },
                     onItemLongClick = { viewModel.toggleTodoSelection(it) },
@@ -163,11 +161,11 @@ fun MainPage(
                     state = listState,
                     list = filteredTodoList,
                     onItemClick = { item ->
-                        if (isSelectedIdsEmpty) {
+                        if (inSelectedMode) {
+                            viewModel.toggleTodoSelection(item)
+                        } else {
                             viewModel.setEditTodoItem(item)
                             toTodoEditPage()
-                        } else {
-                            viewModel.toggleTodoSelection(item)
                         }
                     },
                     onItemLongClick = { viewModel.toggleTodoSelection(it) },

app/src/main/kotlin/cn/super12138/todo/ui/pages/settings/SettingsDataCategory.kt

@@ -47,6 +47,7 @@ fun SettingsDataCategory(
     modifier: Modifier = Modifier
 ) {
     // TODO: 本页及其相关组件重组性能检查优化
+    // TODO: 优化内部项目样式
     val scrollBehavior = TopAppBarDefaults.exitUntilCollapsedScrollBehavior()
     val snackbarHostState = remember { SnackbarHostState() }
     val scope = rememberCoroutineScope()