Create a reusable selectusers feature module

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

@@ -28,8 +28,8 @@ import com.bumble.appyx.navmodel.backstack.operation.push
 import dagger.assisted.Assisted
 import dagger.assisted.AssistedInject
 import io.element.android.anvilannotations.ContributesNode
+import io.element.android.features.createroom.impl.addpeople.AddPeopleNode
 import io.element.android.features.createroom.impl.root.CreateRoomRootNode
-import io.element.android.features.createroom.impl.selectusers.SelectUsersNode
 import io.element.android.libraries.architecture.BackstackNode
 import io.element.android.libraries.architecture.animation.rememberDefaultTransitionHandler
 import io.element.android.libraries.architecture.createNode
@@ -67,7 +67,7 @@ class CreateRoomFlowNode @AssistedInject constructor(
                 }
                 createNode<CreateRoomRootNode>(buildContext, plugins = listOf(callback))
             }
-            NavTarget.NewRoom -> createNode<SelectUsersNode>(buildContext)
+            NavTarget.NewRoom -> createNode<AddPeopleNode>(buildContext)
         }
     }
 

features/createroom/impl/src/main/kotlin/io/element/android/features/createroom/impl/addpeople/AddPeopleEvents.kt

@@ -0,0 +1,24 @@
+/*
+ * 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.features.createroom.impl.addpeople
+
+import io.element.android.libraries.matrix.ui.model.MatrixUser
+import kotlinx.collections.immutable.ImmutableList
+
+sealed interface AddPeopleEvents {
+    data class UpdateSelection(val users: ImmutableList<MatrixUser>) : AddPeopleEvents
+}

features/createroom/impl/src/main/kotlin/io/element/android/features/createroom/impl/addpeople/AddPeopleNode.kt

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package io.element.android.features.createroom.impl.selectusers
+package io.element.android.features.createroom.impl.addpeople
 
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Modifier
@@ -27,16 +27,16 @@ import io.element.android.anvilannotations.ContributesNode
 import io.element.android.libraries.di.AppScope
 
 @ContributesNode(AppScope::class)
-class SelectUsersNode @AssistedInject constructor(
+class AddPeopleNode @AssistedInject constructor(
     @Assisted buildContext: BuildContext,
     @Assisted plugins: List<Plugin>,
-    private val presenter: SelectUsersPresenter,
+    private val presenter: AddPeoplePresenter,
 ) : Node(buildContext, plugins = plugins) {
 
     @Composable
     override fun View(modifier: Modifier) {
         val state = presenter.present()
-        SelectUsersView(
+        AddPeopleView(
             state = state,
             modifier = modifier,
             onBackPressed = { navigateUp() },

features/createroom/impl/src/main/kotlin/io/element/android/features/createroom/impl/addpeople/AddPeoplePresenter.kt

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package io.element.android.features.createroom.impl.selectusers
+package io.element.android.features.createroom.impl.addpeople
 
 import androidx.compose.runtime.Composable
 import androidx.compose.runtime.MutableState
@@ -24,24 +24,22 @@ import io.element.android.libraries.architecture.Presenter
 import io.element.android.libraries.matrix.ui.model.MatrixUser
 import kotlinx.collections.immutable.ImmutableList
 import kotlinx.collections.immutable.persistentListOf
-import kotlinx.collections.immutable.toImmutableList
 import javax.inject.Inject
 
 // TODO add unit tests
-class SelectUsersPresenter @Inject constructor() : Presenter<SelectUsersState> {
+class AddPeoplePresenter @Inject constructor() : Presenter<AddPeopleState> {
 
     @Composable
-    override fun present(): SelectUsersState {
-        val selectedUsers: MutableState<ImmutableList<MatrixUser>> = remember { mutableStateOf(persistentListOf()) }
+    override fun present(): AddPeopleState {
+        val selectedUsers: MutableState<ImmutableList<MatrixUser>> = remember { mutableStateOf(persistentListOf(aMatrixUser("test"))) }
 
-        fun handleEvents(event: SelectUsersEvents) {
+        fun handleEvents(event: AddPeopleEvents) {
             when (event) {
-                is SelectUsersEvents.AddToSelection -> selectedUsers.value = selectedUsers.value.plus(event.matrixUser).toImmutableList()
-                is SelectUsersEvents.RemoveFromSelection -> selectedUsers.value = selectedUsers.value.minus(event.matrixUser).toImmutableList()
+                is AddPeopleEvents.UpdateSelection -> selectedUsers.value = event.users
             }
         }
 
-        return SelectUsersState(
+        return AddPeopleState(
             selectedUsers = selectedUsers.value,
             eventSink = ::handleEvents,
         )

features/createroom/impl/src/main/kotlin/io/element/android/features/createroom/impl/addpeople/AddPeopleState.kt

@@ -0,0 +1,25 @@
+/*
+ * 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.features.createroom.impl.addpeople
+
+import io.element.android.libraries.matrix.ui.model.MatrixUser
+import kotlinx.collections.immutable.ImmutableList
+
+data class AddPeopleState(
+    val selectedUsers: ImmutableList<MatrixUser>,
+    val eventSink: (AddPeopleEvents) -> Unit,
+)

features/createroom/impl/src/main/kotlin/io/element/android/features/createroom/impl/addpeople/AddPeopleStateProvider.kt

@@ -0,0 +1,46 @@
+/*
+ * 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.features.createroom.impl.addpeople
+
+import androidx.compose.ui.tooling.preview.PreviewParameterProvider
+import io.element.android.libraries.designsystem.components.avatar.AvatarData
+import io.element.android.libraries.matrix.api.core.UserId
+import io.element.android.libraries.matrix.ui.model.MatrixUser
+import kotlinx.collections.immutable.persistentListOf
+
+open class AddPeopleStateProvider : PreviewParameterProvider<AddPeopleState> {
+    override val values: Sequence<AddPeopleState>
+        get() = sequenceOf(
+            aAddPeopleState(),
+            aAddPeopleState().copy(
+                selectedUsers = persistentListOf(
+                    aMatrixUser(userName = ""),
+                    aMatrixUser(userName = "User"),
+                    aMatrixUser(userName = "User with long name"),
+                )
+            )
+        )
+}
+
+fun aAddPeopleState() = AddPeopleState(
+    selectedUsers = persistentListOf(),
+    eventSink = {}
+)
+
+fun aMatrixUser(userName: String): MatrixUser {
+    return MatrixUser(id = UserId("@id"), username = userName, avatarData = AvatarData("@id", "U"))
+}

features/createroom/impl/src/main/kotlin/io/element/android/features/createroom/impl/addpeople/AddPeopleView.kt

@@ -0,0 +1,120 @@
+/*
+ * Copyright (c) 2022 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.features.createroom.impl.addpeople
+
+import androidx.compose.foundation.layout.Column
+import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.padding
+import androidx.compose.material3.ExperimentalMaterial3Api
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.saveable.rememberSaveable
+import androidx.compose.runtime.setValue
+import androidx.compose.ui.Modifier
+import androidx.compose.ui.res.stringResource
+import androidx.compose.ui.text.font.FontWeight
+import androidx.compose.ui.tooling.preview.Preview
+import androidx.compose.ui.tooling.preview.PreviewParameter
+import androidx.compose.ui.unit.dp
+import androidx.compose.ui.unit.sp
+import io.element.android.libraries.designsystem.components.button.BackButton
+import io.element.android.libraries.designsystem.preview.ElementPreviewDark
+import io.element.android.libraries.designsystem.preview.ElementPreviewLight
+import io.element.android.libraries.designsystem.theme.components.CenterAlignedTopAppBar
+import io.element.android.libraries.designsystem.theme.components.Scaffold
+import io.element.android.libraries.designsystem.theme.components.Text
+import io.element.android.libraries.designsystem.theme.components.TextButton
+import io.element.android.libraries.ui.strings.R as StringR
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun AddPeopleView(
+    state: AddPeopleState,
+    modifier: Modifier = Modifier,
+    onBackPressed: () -> Unit = {},
+    onNextPressed: () -> Unit = {},
+) {
+    var isSearchActive by rememberSaveable { mutableStateOf(false) }
+    val eventSink = state.eventSink
+
+    Scaffold(
+        topBar = {
+            AddPeopleViewTopBar(
+                hasSelectedUsers = state.selectedUsers.isNotEmpty(),
+                onBackPressed = onBackPressed,
+                onNextPressed = onNextPressed,
+            )
+        }
+    ) { padding ->
+        Column(
+            modifier = modifier
+                .fillMaxSize()
+                .padding(padding),
+        ) {
+            // TODO use reusable searchUser bar with multi selection
+        }
+    }
+}
+
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun AddPeopleViewTopBar(
+    hasSelectedUsers: Boolean,
+    modifier: Modifier = Modifier,
+    onBackPressed: () -> Unit = {},
+    onNextPressed: () -> Unit = {},
+) {
+    CenterAlignedTopAppBar(
+        modifier = modifier,
+        title = {
+            Text(
+                text = stringResource(id = StringR.string.add_people),
+                fontSize = 16.sp,
+                fontWeight = FontWeight.SemiBold,
+            )
+        },
+        navigationIcon = { BackButton(onClick = onBackPressed) },
+        actions = {
+            TextButton(
+                modifier = Modifier.padding(horizontal = 8.dp),
+                onClick = onNextPressed,
+            ) {
+                val textActionResId = if (hasSelectedUsers) StringR.string.action_next else StringR.string.action_skip
+                Text(
+                    text = stringResource(id = textActionResId),
+                    fontSize = 16.sp,
+                )
+            }
+        }
+    )
+}
+
+@Preview
+@Composable
+internal fun ChangeServerViewLightPreview(@PreviewParameter(AddPeopleStateProvider::class) state: AddPeopleState) =
+    ElementPreviewLight { ContentToPreview(state) }
+
+@Preview
+@Composable
+internal fun ChangeServerViewDarkPreview(@PreviewParameter(AddPeopleStateProvider::class) state: AddPeopleState) =
+    ElementPreviewDark { ContentToPreview(state) }
+
+@Composable
+private fun ContentToPreview(state: AddPeopleState) {
+    AddPeopleView(state = state)
+}

features/selectusers/api/build.gradle.kts

@@ -0,0 +1,30 @@
+/*
+ * 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.
+ */
+
+plugins {
+    id("io.element.android-compose-library")
+}
+
+android {
+    namespace = "io.element.android.features.selectusers.api"
+}
+
+dependencies {
+    implementation(projects.libraries.architecture)
+    implementation(projects.libraries.designsystem)
+    implementation(projects.libraries.uiStrings)
+    implementation(projects.libraries.matrixui)
+}

features/selectusers/api/src/main/kotlin/io/element/android/features/selectusers/api/SelectUsersEvents.kt

@@ -14,11 +14,12 @@
  * limitations under the License.
  */
 
-package io.element.android.features.createroom.impl.selectusers
+package io.element.android.features.selectusers.api
 
 import io.element.android.libraries.matrix.ui.model.MatrixUser
 
 sealed interface SelectUsersEvents {
+    data class UpdateSearchQuery(val query: String) : SelectUsersEvents
     data class AddToSelection(val matrixUser: MatrixUser) : SelectUsersEvents
     data class RemoveFromSelection(val matrixUser: MatrixUser) : SelectUsersEvents
 }

features/selectusers/api/src/main/kotlin/io/element/android/features/selectusers/api/SelectUsersPresenter.kt

@@ -0,0 +1,21 @@
+/*
+ * 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.features.selectusers.api
+
+import io.element.android.libraries.architecture.Presenter
+
+interface SelectUsersPresenter : Presenter<SelectUsersState>

features/selectusers/api/src/main/kotlin/io/element/android/features/selectusers/api/SelectUsersState.kt

@@ -14,12 +14,14 @@
  * limitations under the License.
  */
 
-package io.element.android.features.createroom.impl.selectusers
+package io.element.android.features.selectusers.api
 
 import io.element.android.libraries.matrix.ui.model.MatrixUser
 import kotlinx.collections.immutable.ImmutableList
 
 data class SelectUsersState(
+    val searchQuery: String,
+    val searchResults: ImmutableList<MatrixUser>,
     val selectedUsers: ImmutableList<MatrixUser>,
     val eventSink: (SelectUsersEvents) -> Unit,
 )

features/selectusers/api/src/main/kotlin/io/element/android/features/selectusers/api/SelectUsersStateProvider.kt

@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package io.element.android.features.createroom.impl.selectusers
+package io.element.android.features.selectusers.api
 
 import androidx.compose.ui.tooling.preview.PreviewParameterProvider
 import io.element.android.libraries.designsystem.components.avatar.AvatarData
@@ -37,6 +37,8 @@ open class SelectUsersStateProvider : PreviewParameterProvider<SelectUsersState>
 }
 
 fun aSelectUsersState() = SelectUsersState(
+    searchQuery = "",
+    searchResults = persistentListOf(),
     selectedUsers = persistentListOf(),
     eventSink = {}
 )

features/selectusers/api/src/main/kotlin/io/element/android/features/selectusers/api/SelectUsersView.kt

@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2022 New Vector Ltd
+ * 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.
@@ -14,47 +14,55 @@
  * limitations under the License.
  */
 
-package io.element.android.features.createroom.impl.selectusers
+package io.element.android.features.selectusers.api
 
 import androidx.compose.foundation.background
 import androidx.compose.foundation.layout.Arrangement
 import androidx.compose.foundation.layout.Box
 import androidx.compose.foundation.layout.Column
 import androidx.compose.foundation.layout.fillMaxSize
+import androidx.compose.foundation.layout.fillMaxWidth
+import androidx.compose.foundation.layout.heightIn
 import androidx.compose.foundation.layout.padding
 import androidx.compose.foundation.layout.size
 import androidx.compose.foundation.layout.width
 import androidx.compose.foundation.lazy.LazyRow
-import androidx.compose.foundation.lazy.items
 import androidx.compose.foundation.shape.CircleShape
 import androidx.compose.material.icons.Icons
 import androidx.compose.material.icons.filled.Close
+import androidx.compose.material.icons.filled.Search
 import androidx.compose.material3.ExperimentalMaterial3Api
 import androidx.compose.material3.MaterialTheme
+import androidx.compose.material3.SearchBarDefaults
 import androidx.compose.runtime.Composable
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.saveable.rememberSaveable
+import androidx.compose.runtime.setValue
 import androidx.compose.ui.Alignment
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.draw.alpha
 import androidx.compose.ui.draw.clip
+import androidx.compose.ui.graphics.Color
+import androidx.compose.ui.platform.LocalFocusManager
 import androidx.compose.ui.res.stringResource
-import androidx.compose.ui.text.font.FontWeight
 import androidx.compose.ui.text.style.TextOverflow
 import androidx.compose.ui.tooling.preview.Preview
 import androidx.compose.ui.tooling.preview.PreviewParameter
 import androidx.compose.ui.unit.dp
-import androidx.compose.ui.unit.sp
 import io.element.android.libraries.designsystem.components.avatar.Avatar
 import io.element.android.libraries.designsystem.components.avatar.AvatarSize
 import io.element.android.libraries.designsystem.components.button.BackButton
 import io.element.android.libraries.designsystem.preview.ElementPreviewDark
 import io.element.android.libraries.designsystem.preview.ElementPreviewLight
-import io.element.android.libraries.designsystem.theme.components.CenterAlignedTopAppBar
+import io.element.android.libraries.designsystem.theme.components.DockedSearchBar
 import io.element.android.libraries.designsystem.theme.components.Icon
 import io.element.android.libraries.designsystem.theme.components.IconButton
-import io.element.android.libraries.designsystem.theme.components.Scaffold
 import io.element.android.libraries.designsystem.theme.components.Text
-import io.element.android.libraries.designsystem.theme.components.TextButton
+import io.element.android.libraries.matrix.ui.components.MatrixUserRow
 import io.element.android.libraries.matrix.ui.model.MatrixUser
 import io.element.android.libraries.matrix.ui.model.getBestName
+import kotlinx.collections.immutable.ImmutableList
 import io.element.android.libraries.ui.strings.R as StringR
 
 @OptIn(ExperimentalMaterial3Api::class)
@@ -62,66 +70,38 @@ import io.element.android.libraries.ui.strings.R as StringR
 fun SelectUsersView(
     state: SelectUsersState,
     modifier: Modifier = Modifier,
-    onBackPressed: () -> Unit = {},
-    onNextPressed: () -> Unit = {},
+    onSearchActiveChanged: (Boolean) -> Unit = {},
+    onSelectionChanged: (ImmutableList<MatrixUser>) -> Unit = {},
 ) {
+    var isSearchActive by rememberSaveable { mutableStateOf(false) }
     val eventSink = state.eventSink
 
-    Scaffold(
-        topBar = {
-            SelectUsersViewTopBar(
-                hasSelectedUsers = state.selectedUsers.isNotEmpty(),
-                onBackPressed = onBackPressed,
-                onNextPressed = onNextPressed,
-            )
-        }
-    ) { padding ->
+    // TODO how to pass back the selection list?
+
     Column(
         modifier = modifier
             .fillMaxSize()
-                .padding(padding)
     ) {
-            // TODO create a SearchUserView with multi selection option + callbacks
+        SearchUserBar(
+            modifier = Modifier.fillMaxWidth(),
+            query = state.searchQuery,
+            results = state.searchResults,
+            active = isSearchActive,
+            onActiveChanged = {
+                isSearchActive = it
+                onSearchActiveChanged(it)
+            },
+            onTextChanged = { state.eventSink(SelectUsersEvents.UpdateSearchQuery(it)) },
+            onResultSelected = { state.eventSink(SelectUsersEvents.AddToSelection(it)) }
+        )
+
+        // TODO move into search content
         SelectedUsersList(
-                modifier = Modifier.padding(horizontal = 16.dp),
+            modifier = Modifier.padding(16.dp),
             selectedUsers = state.selectedUsers,
             onUserRemoved = { eventSink(SelectUsersEvents.RemoveFromSelection(it)) }
         )
     }
-    }
-}
-
-@OptIn(ExperimentalMaterial3Api::class)
-@Composable
-fun SelectUsersViewTopBar(
-    hasSelectedUsers: Boolean,
-    modifier: Modifier = Modifier,
-    onBackPressed: () -> Unit = {},
-    onNextPressed: () -> Unit = {},
-) {
-    CenterAlignedTopAppBar(
-        modifier = modifier,
-        title = {
-            Text(
-                text = stringResource(id = StringR.string.add_people),
-                fontSize = 16.sp,
-                fontWeight = FontWeight.SemiBold,
-            )
-        },
-        navigationIcon = { BackButton(onClick = onBackPressed) },
-        actions = {
-            TextButton(
-                modifier = Modifier.padding(horizontal = 8.dp),
-                onClick = onNextPressed,
-            ) {
-                val textActionResId = if (hasSelectedUsers) StringR.string.action_next else StringR.string.action_skip
-                Text(
-                    text = stringResource(id = textActionResId),
-                    fontSize = 16.sp,
-                )
-            }
-        }
-    )
 }
 
 @Composable
@@ -178,6 +158,88 @@ fun SelectedUser(
     }
 }
 
+@OptIn(ExperimentalMaterial3Api::class)
+@Composable
+fun SearchUserBar(
+    query: String,
+    results: ImmutableList<MatrixUser>,
+    active: Boolean,
+    modifier: Modifier = Modifier,
+    placeHolderTitle: String = stringResource(StringR.string.search_for_someone),
+    onActiveChanged: (Boolean) -> Unit = {},
+    onTextChanged: (String) -> Unit = {},
+    onResultSelected: (MatrixUser) -> Unit = {},
+) {
+    val focusManager = LocalFocusManager.current
+
+    if (!active) {
+        onTextChanged("")
+        focusManager.clearFocus()
+    }
+
+    DockedSearchBar(
+        query = query,
+        onQueryChange = onTextChanged,
+        onSearch = { focusManager.clearFocus() },
+        active = active,
+        onActiveChange = onActiveChanged,
+        modifier = modifier
+            .padding(horizontal = if (!active) 16.dp else 0.dp),
+        placeholder = {
+            Text(
+                text = placeHolderTitle,
+                modifier = Modifier.alpha(0.4f), // FIXME align on Design system theme (removing alpha should be fine)
+            )
+        },
+        leadingIcon = if (active) {
+            { BackButton(onClick = { onActiveChanged(false) }) }
+        } else null,
+        trailingIcon = when {
+            active && query.isNotEmpty() -> {
+                {
+                    IconButton(onClick = { onTextChanged("") }) {
+                        Icon(Icons.Default.Close, stringResource(StringR.string.a11y_clear))
+                    }
+                }
+            }
+            !active -> {
+                {
+                    Icon(
+                        imageVector = Icons.Default.Search,
+                        contentDescription = stringResource(StringR.string.search),
+                        modifier = Modifier.alpha(0.4f), // FIXME align on Design system theme (removing alpha should be fine)
+                    )
+                }
+            }
+            else -> null
+        },
+        shape = if (!active) SearchBarDefaults.dockedShape else SearchBarDefaults.fullScreenShape,
+        colors = if (!active) SearchBarDefaults.colors() else SearchBarDefaults.colors(containerColor = Color.Transparent),
+        content = {
+            results.forEach {
+                SearchUserResultItem(
+                    matrixUser = it,
+                    onClick = { onResultSelected(it) }
+                )
+            }
+        },
+    )
+}
+
+@Composable
+fun SearchUserResultItem(
+    matrixUser: MatrixUser,
+    modifier: Modifier = Modifier,
+    onClick: () -> Unit = {},
+) {
+    MatrixUserRow(
+        modifier = modifier.heightIn(min = 56.dp),
+        matrixUser = matrixUser,
+        avatarSize = AvatarSize.Custom(36),
+        onClick = onClick,
+    )
+}
+
 @Preview
 @Composable
 internal fun ChangeServerViewLightPreview(@PreviewParameter(SelectUsersStateProvider::class) state: SelectUsersState) =

features/selectusers/impl/build.gradle.kts

@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2022 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.
+ */
+
+// TODO: Remove once https://youtrack.jetbrains.com/issue/KTIJ-19369 is fixed
+@Suppress("DSL_SCOPE_VIOLATION")
+plugins {
+    id("io.element.android-compose-library")
+    alias(libs.plugins.anvil)
+    alias(libs.plugins.ksp)
+}
+
+android {
+    namespace = "io.element.android.features.selectusers.impl"
+}
+
+anvil {
+    generateDaggerFactories.set(true)
+}
+
+dependencies {
+    implementation(projects.anvilannotations)
+    anvil(projects.anvilcodegen)
+    implementation(projects.libraries.core)
+    implementation(projects.libraries.architecture)
+    implementation(projects.libraries.matrix.api)
+    implementation(projects.libraries.matrixui)
+    implementation(projects.libraries.designsystem)
+    implementation(projects.libraries.elementresources)
+    implementation(projects.libraries.testtags)
+    implementation(projects.libraries.uiStrings)
+    api(projects.features.selectusers.api)
+    ksp(libs.showkase.processor)
+
+    testImplementation(libs.test.junit)
+    testImplementation(libs.coroutines.test)
+    testImplementation(libs.molecule.runtime)
+    testImplementation(libs.test.truth)
+    testImplementation(libs.test.turbine)
+    testImplementation(projects.libraries.matrix.test)
+
+    androidTestImplementation(libs.test.junitext)
+}

features/selectusers/impl/src/main/AndroidManifest.xml

@@ -0,0 +1,20 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+  ~ 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.
+  -->
+
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+</manifest>

features/selectusers/impl/src/main/kotlin/io/element/android/features/selectusers/impl/DefaultSelectUsersPresenter.kt

@@ -0,0 +1,89 @@
+/*
+ * 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.features.selectusers.impl
+
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.LaunchedEffect
+import androidx.compose.runtime.MutableState
+import androidx.compose.runtime.getValue
+import androidx.compose.runtime.mutableStateOf
+import androidx.compose.runtime.remember
+import androidx.compose.runtime.saveable.rememberSaveable
+import androidx.compose.runtime.setValue
+import com.squareup.anvil.annotations.ContributesBinding
+import io.element.android.features.selectusers.api.SelectUsersEvents
+import io.element.android.features.selectusers.api.SelectUsersPresenter
+import io.element.android.features.selectusers.api.SelectUsersState
+import io.element.android.libraries.di.SessionScope
+import io.element.android.libraries.matrix.api.core.MatrixPatterns
+import io.element.android.libraries.matrix.api.core.UserId
+import io.element.android.libraries.matrix.ui.model.MatrixUser
+import kotlinx.collections.immutable.ImmutableList
+import kotlinx.collections.immutable.persistentListOf
+import kotlinx.collections.immutable.toImmutableList
+import javax.inject.Inject
+
+// TODO add unit tests
+@ContributesBinding(SessionScope::class)
+class DefaultSelectUsersPresenter @Inject constructor() : SelectUsersPresenter {
+
+    @Composable
+    override fun present(): SelectUsersState {
+        val selectedUsers: MutableState<ImmutableList<MatrixUser>> = remember { mutableStateOf(persistentListOf()) }
+        var searchQuery by rememberSaveable { mutableStateOf("") }
+        val searchResults: MutableState<ImmutableList<MatrixUser>> = remember {
+            mutableStateOf(persistentListOf())
+        }
+
+        fun handleEvents(event: SelectUsersEvents) {
+            when (event) {
+                is SelectUsersEvents.UpdateSearchQuery -> searchQuery = event.query
+                is SelectUsersEvents.AddToSelection -> selectedUsers.value = selectedUsers.value.plus(event.matrixUser).toImmutableList()
+                is SelectUsersEvents.RemoveFromSelection -> selectedUsers.value = selectedUsers.value.minus(event.matrixUser).toImmutableList()
+            }
+        }
+
+        LaunchedEffect(searchQuery) {
+            searchResults.value = if (MatrixPatterns.isUserId(searchQuery)) {
+                persistentListOf(MatrixUser(UserId(searchQuery)))
+            } else {
+                persistentListOf()
+            }
+            if (searchQuery.isNotEmpty()) {
+                searchResults.value = performSearch(searchQuery)
+            }
+        }
+
+        return SelectUsersState(
+            searchQuery = searchQuery,
+            searchResults = searchResults.value,
+            selectedUsers = selectedUsers.value,
+            eventSink = ::handleEvents,
+        )
+    }
+
+    private fun performSearch(query: String): ImmutableList<MatrixUser> {
+        val isMatrixId = MatrixPatterns.isUserId(query)
+        val results = mutableListOf<MatrixUser>()// TODO trigger /search request
+        if (isMatrixId && results.none { it.id.value == query }) {
+            val getProfileResult: MatrixUser? = null // TODO trigger /profile request
+            val profile = getProfileResult ?: MatrixUser(UserId(query))
+            results.add(0, profile)
+        }
+        return results.toImmutableList()
+    }
+}

settings.gradle.kts

@@ -92,3 +92,5 @@ include(":features:createroom:api")
 include(":features:createroom:impl")
 include(":features:verifysession:api")
 include(":features:verifysession:impl")
+include(":features:selectusers:api")
+include(":features:selectusers:impl")