Logic to store the currently selected users

features/createroom/impl/src/main/kotlin/io/element/android/features/createroom/impl/selectmembers/SelectMembersEvents.kt

@@ -16,4 +16,9 @@
 
 package io.element.android.features.createroom.impl.selectmembers
 
-sealed interface SelectMembersEvents
+import io.element.android.libraries.matrix.ui.model.MatrixUser
+
+sealed interface SelectMembersEvents {
+    data class AddToSelection(val matrixUser: MatrixUser) : SelectMembersEvents
+    data class RemoveFromSelection(val matrixUser: MatrixUser) : SelectMembersEvents
+}

features/createroom/impl/src/main/kotlin/io/element/android/features/createroom/impl/selectmembers/SelectMembersPresenter.kt

@@ -17,20 +17,33 @@
 package io.element.android.features.createroom.impl.selectmembers
 
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.saveable.rememberSaveable
 import io.element.android.libraries.architecture.Presenter
+import io.element.android.libraries.matrix.ui.model.MatrixUser
 import javax.inject.Inject
 
+// TODO add unit tests
 class SelectMembersPresenter @Inject constructor() : Presenter<SelectMembersState> {
 
     @Composable
     override fun present(): SelectMembersState {
+        val selectedUsers = rememberSaveable { mutableStateOf(emptyList<MatrixUser>()) }
 
         fun handleEvents(event: SelectMembersEvents) {
-            // do nothing for now
+            when (event) {
+                is SelectMembersEvents.AddToSelection -> selectedUsers.value = mutableListOf<MatrixUser>().also {
+                    it.addAll(selectedUsers.value.plus(event.matrixUser))
+                }
+                is SelectMembersEvents.RemoveFromSelection -> selectedUsers.value = mutableListOf<MatrixUser>().also {
+                    it.addAll(selectedUsers.value.minus(event.matrixUser))
+                }
+            }
         }
 
         return SelectMembersState(
-            eventSink = ::handleEvents
+            selectedUsers = selectedUsers.value,
+            eventSink = ::handleEvents,
         )
     }
 }

features/createroom/impl/src/main/kotlin/io/element/android/features/createroom/impl/selectmembers/SelectMembersView.kt

@@ -79,12 +79,12 @@ fun SelectMembersView(
                 .fillMaxSize()
                 .padding(padding)
         ) {
+            // TODO create a SearchUserView with multi selection option + callbacks
             SelectedMembersList(
                 modifier = Modifier.padding(horizontal = 16.dp),
                 selectedUsers = state.selectedUsers,
+                onUserRemoved = { eventSink(SelectMembersEvents.RemoveFromSelection(it)) }
             )
-            // TODO create ViewEvent to add/remove selected user
-            // TODO create a SearchUserView with multi selection option + callbacks
         }
     }
 }