Create MessageComposerStateProvider. Preview is limited for now.

features/messages/src/main/kotlin/io/element/android/features/messages/textcomposer/MessageComposerState.kt

@@ -29,10 +29,3 @@ data class MessageComposerState(
 ) {
     val isSendButtonVisible: Boolean = text?.charSequence.isNullOrEmpty().not()
 }
-
-fun aMessageComposerState() = MessageComposerState(
-    text = StableCharSequence(""),
-    isFullScreen = false,
-    mode = MessageComposerMode.Normal(content = ""),
-    eventSink = {}
-)

features/messages/src/main/kotlin/io/element/android/features/messages/textcomposer/MessageComposerStateProvider.kt

@@ -0,0 +1,35 @@
+/*
+ * 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.messages.textcomposer
+
+import androidx.compose.ui.tooling.preview.PreviewParameterProvider
+import io.element.android.libraries.core.data.StableCharSequence
+import io.element.android.libraries.textcomposer.MessageComposerMode
+
+open class MessageComposerStateProvider : PreviewParameterProvider<MessageComposerState> {
+    override val values: Sequence<MessageComposerState>
+        get() = sequenceOf(
+            aMessageComposerState(),
+        )
+}
+
+fun aMessageComposerState() = MessageComposerState(
+    text = StableCharSequence(""),
+    isFullScreen = false,
+    mode = MessageComposerMode.Normal(content = ""),
+    eventSink = {}
+)

features/messages/src/main/kotlin/io/element/android/features/messages/textcomposer/MessageComposerView.kt

@@ -18,6 +18,10 @@ package io.element.android.features.messages.textcomposer
 
 import androidx.compose.runtime.Composable
 import androidx.compose.ui.Modifier
+import androidx.compose.ui.tooling.preview.Preview
+import androidx.compose.ui.tooling.preview.PreviewParameter
+import io.element.android.libraries.designsystem.preview.ElementPreviewDark
+import io.element.android.libraries.designsystem.preview.ElementPreviewLight
 import io.element.android.libraries.designsystem.theme.ElementTheme
 import io.element.android.libraries.textcomposer.TextComposer
 
@@ -55,3 +59,18 @@ fun MessageComposerView(
         modifier = modifier
     )
 }
+
+@Preview
+@Composable
+internal fun MessageComposerViewLightPreview(@PreviewParameter(MessageComposerStateProvider::class) state: MessageComposerState) =
+    ElementPreviewLight { ContentToPreview(state) }
+
+@Preview
+@Composable
+internal fun MessageComposerViewDarkPreview(@PreviewParameter(MessageComposerStateProvider::class) state: MessageComposerState) =
+    ElementPreviewDark { ContentToPreview(state) }
+
+@Composable
+private fun ContentToPreview(state: MessageComposerState) {
+    MessageComposerView(state)
+}