RoomMembers: change the API again..

libraries/matrixui/src/main/kotlin/io/element/android/libraries/matrix/ui/room/MatrixRoomMembers.kt

@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2023 New Vector Ltd
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package io.element.android.libraries.matrix.ui.room
+
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.State
+import androidx.compose.runtime.collectAsState
+import androidx.compose.runtime.derivedStateOf
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.remember
+import io.element.android.libraries.matrix.api.core.UserId
+import io.element.android.libraries.matrix.api.room.MatrixRoom
+import io.element.android.libraries.matrix.api.room.RoomMember
+import io.element.android.libraries.matrix.api.room.roomMembers
+
+@Composable
+fun MatrixRoom.roomMember(userId: UserId): State<RoomMember?> {
+    val roomMembersState by membersStateFlow.collectAsState()
+    val roomMembers = roomMembersState.roomMembers()
+    return remember(roomMembers) {
+        derivedStateOf {
+            roomMembers?.find {
+                it.userId == userId
+            }
+        }
+    }
+}
+
+@Composable
+fun MatrixRoom.directRoomMember(): State<RoomMember?> {
+    val roomMembersState by membersStateFlow.collectAsState()
+    val roomMembers = roomMembersState.roomMembers()
+    return remember(roomMembers) {
+        derivedStateOf {
+            if (roomMembers == null) {
+                null
+            } else if (roomMembers.size == 2 && isDirect && isEncrypted) {
+                roomMembers.find { it.userId != this.sessionId }
+            } else {
+                null
+            }
+        }
+    }
+}