feat(ui): 支持长按单个记录直接进入多选模式并选中

core/src/main/kotlin/plus/rua/project/DateRecorderViewModel.kt

@@ -130,6 +130,16 @@ class DateRecorderViewModel(
         _selectedIds.value = emptySet()
     }
 
+    /**
+     * 开启多选模式并选中指定的记录 ID（响应长按操作）。
+     *
+     * @param id 长按选中的记录 ID
+     */
+    fun startSelectionModeWith(id: Long) {
+        _selectionMode.value = true
+        _selectedIds.value = setOf(id)
+    }
+
     /**
      * 切换某条记录的选中状态。
      */

core/src/main/kotlin/plus/rua/project/ui/DateRecorderScreen.kt

@@ -16,6 +16,8 @@ import androidx.compose.animation.slideInVertically
 import androidx.compose.animation.slideOutVertically
 import androidx.compose.animation.togetherWith
 import androidx.compose.foundation.BorderStroke
+import androidx.compose.foundation.ExperimentalFoundationApi
+import androidx.compose.foundation.combinedClickable
 import androidx.compose.foundation.background
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
@@ -303,7 +305,8 @@ fun DateRecorderScreen(
                     selectionMode = uiState.selectionMode,
                     photoRoot = repo,
                     onOpenRecord = onOpenRecord,
-                    onToggleSelection = viewModel::toggleSelection
+                    onToggleSelection = viewModel::toggleSelection,
+                    onStartSelectionWith = viewModel::startSelectionModeWith
                 )
             }
         }
@@ -341,7 +344,8 @@ private fun RecordGrid(
     selectionMode: Boolean,
     photoRoot: DateRecorderRepository,
     onOpenRecord: (Long) -> Unit,
-    onToggleSelection: (Long) -> Unit
+    onToggleSelection: (Long) -> Unit,
+    onStartSelectionWith: (Long) -> Unit
 ) {
     LazyVerticalGrid(
         columns = GridCells.Adaptive(minSize = 100.dp),
@@ -359,12 +363,20 @@ private fun RecordGrid(
                 onClick = {
                     if (selectionMode) onToggleSelection(record.id)
                     else onOpenRecord(record.id)
+                },
+                onLongClick = {
+                    if (selectionMode) {
+                        onToggleSelection(record.id)
+                    } else {
+                        onStartSelectionWith(record.id)
+                    }
                 }
             )
         }
     }
 }
 
+@OptIn(ExperimentalFoundationApi::class)
 @Composable
 private fun RecordCard(
     record: DateRecord,
@@ -372,6 +384,7 @@ private fun RecordCard(
     isSelected: Boolean,
     selectionMode: Boolean,
     onClick: () -> Unit,
+    onLongClick: () -> Unit,
     modifier: Modifier = Modifier
 ) {
     val cardScale by animateFloatAsState(
@@ -389,9 +402,9 @@ private fun RecordCard(
         animationSpec = tween(200),
         label = "record_card_border_color"
     )
+    val cardShape = RoundedCornerShape(8.dp)
     Card(
-        onClick = onClick,
-        shape = RoundedCornerShape(8.dp),
+        shape = cardShape,
         border = BorderStroke(borderWidth, borderColor),
         elevation = CardDefaults.cardElevation(defaultElevation = 0.dp),
         modifier = modifier
@@ -400,6 +413,11 @@ private fun RecordCard(
                 scaleX = cardScale
                 scaleY = cardScale
             }
+            .clip(cardShape)
+            .combinedClickable(
+                onClick = onClick,
+                onLongClick = onLongClick
+            )
     ) {
         Box {
             AsyncImage(

core/src/test/kotlin/plus/rua/project/DateRecorderViewModelTest.kt

@@ -0,0 +1,87 @@
+package plus.rua.project
+
+import java.io.File
+import kotlin.test.AfterTest
+import kotlin.test.BeforeTest
+import kotlin.test.Test
+import kotlin.test.assertEquals
+import kotlin.test.assertFalse
+import kotlin.test.assertTrue
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.ExperimentalCoroutinesApi
+import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.flowOf
+import kotlinx.coroutines.launch
+import kotlinx.coroutines.test.UnconfinedTestDispatcher
+import kotlinx.coroutines.test.resetMain
+import kotlinx.coroutines.test.runTest
+import kotlinx.coroutines.test.setMain
+
+/**
+ * [DateRecorderViewModel] 的多选模式与选择状态单元测试。
+ */
+@OptIn(ExperimentalCoroutinesApi::class)
+class DateRecorderViewModelTest {
+
+    private val testDispatcher = UnconfinedTestDispatcher()
+
+    @BeforeTest
+    fun setUp() {
+        Dispatchers.setMain(testDispatcher)
+    }
+
+    @AfterTest
+    fun tearDown() {
+        Dispatchers.resetMain()
+    }
+
+    private fun newViewModel(): DateRecorderViewModel {
+        val repository = DateRecorderRepository(FakeDateRecorderDao(), File("build/tmp/date_recorder_vm_test"))
+        return DateRecorderViewModel(repository)
+    }
+
+    @Test
+    fun startSelectionModeWith_enablesSelectionMode_andSelectsSpecifiedId() = runTest(testDispatcher) {
+        val vm = newViewModel()
+        backgroundScope.launch { vm.uiState.collect {} }
+        assertFalse(vm.uiState.value.selectionMode)
+
+        vm.startSelectionModeWith(42L)
+
+        assertTrue(vm.uiState.value.selectionMode)
+        assertEquals(setOf(42L), vm.uiState.value.selectedIds)
+    }
+
+    @Test
+    fun toggleSelectionMode_togglesState_andClearsSelection() = runTest(testDispatcher) {
+        val vm = newViewModel()
+        backgroundScope.launch { vm.uiState.collect {} }
+        vm.startSelectionModeWith(100L)
+        assertTrue(vm.uiState.value.selectionMode)
+
+        vm.toggleSelectionMode()
+        assertFalse(vm.uiState.value.selectionMode)
+        assertTrue(vm.uiState.value.selectedIds.isEmpty())
+    }
+
+    @Test
+    fun toggleSelection_addsAndRemovesId() = runTest(testDispatcher) {
+        val vm = newViewModel()
+        backgroundScope.launch { vm.uiState.collect {} }
+        vm.startSelectionModeWith(1L)
+
+        vm.toggleSelection(2L)
+        assertEquals(setOf(1L, 2L), vm.uiState.value.selectedIds)
+
+        vm.toggleSelection(1L)
+        assertEquals(setOf(2L), vm.uiState.value.selectedIds)
+    }
+}
+
+private class FakeDateRecorderDao : DateRecordDao {
+    override fun getByIdFlow(id: Long): Flow<DateRecord?> = flowOf(null)
+    override fun getAllFlow(): Flow<List<DateRecord>> = flowOf(emptyList())
+    override suspend fun insert(record: DateRecord): Long = 0
+    override suspend fun update(record: DateRecord) = Unit
+    override suspend fun deleteByIds(ids: List<Long>): Int = 0
+}