feat: Added selected image

lib/src/message_input.dart

@@ -637,7 +637,7 @@ class MessageInputState extends State<MessageInput> {
   Widget _buildPickerSection() {
     switch (_filePickerIndex) {
       case 0:
-        return FutureBuilder<List<Medium>>(
+        return FutureBuilder(
             future: _getAllMedia(),
             builder: (context, mediaData) {
               if (!mediaData.hasData) {
@@ -647,40 +647,46 @@ class MessageInputState extends State<MessageInput> {
               }
 
               return GridView.builder(
-                itemCount: mediaData.data.length,
+                itemCount: mediaData.data.item2.length,
                 gridDelegate: SliverGridDelegateWithFixedCrossAxisCount(
                     crossAxisCount: 3),
                 itemBuilder: (context, position) {
-                  return FutureBuilder<List<dynamic>>(
-                      future: PhotoGallery.getThumbnail(
-                          mediumId: mediaData.data[position].id),
-                      builder: (context, snapshot) {
-                        if (!snapshot.hasData) {
-                          return Center(
-                            child: CircularProgressIndicator(),
-                          );
-                        }
-
                   return Padding(
                     padding: const EdgeInsets.symmetric(
                         horizontal: 1.0, vertical: 1.0),
                     child: InkWell(
-                            child: AspectRatio(
+                      child: Stack(
+                        children: [
+                          AspectRatio(
+                            aspectRatio: 1.0,
                             child: Image.memory(
-                                snapshot.data,
-                                fit: mediaData.data[position].height >
-                                        mediaData.data[position].width
+                              mediaData.data.item2[position],
+                              fit: mediaData.data.item1[position].height >
+                                  mediaData.data.item1[position].width
                                   ? BoxFit.fitWidth
                                   : BoxFit.fitHeight,
                             ),
-                              aspectRatio: 1.0,
+                          ),
+                          if (_attachments.any((element) =>
+                          element.id ==
+                              mediaData.data.item1[position].id))
+                            Container(
+                              color: Colors.black.withOpacity(0.5),
+                              child: Center(
+                                child: Icon(
+                                  StreamIcons.check_send,
+                                  color: Colors.white,
+                                  size: 24.0,
+                                ),
+                              ),
+                            ),
+                        ],
                       ),
                       onTap: () {
-                              _addAttachment(mediaData.data[position]);
+                        _addAttachment(mediaData.data.item1[position]);
                       },
                     ),
                   );
-                      });
                 },
               );
             });
@@ -715,6 +721,7 @@ class MessageInputState extends State<MessageInput> {
         localUri: file.path != null ? Uri.parse(file.path) : null,
         type: medium.mediumType == MediumType.image ? 'image' : 'video',
       ),
+      id: medium.id,
     );
 
     setState(() {
@@ -747,10 +754,11 @@ class MessageInputState extends State<MessageInput> {
     });
   }
 
-  Future<List<Medium>> _getAllMedia() async {
+  Future<Tuple2<List<Medium>, List<dynamic>>> _getAllMedia() async {
     var allAlbums = await PhotoGallery.listAlbums(mediumType: MediumType.image);
     //var allVideoAlbums = await PhotoGallery.listAlbums(mediumType: MediumType.video);
     List<Medium> resultList = [];
+    List<List<dynamic>> resultThumbnailList = [];
 
     for (var album in allAlbums) {
       var data = await album.listMedia();
@@ -764,7 +772,11 @@ class MessageInputState extends State<MessageInput> {
 
     resultList.sort((a, b) => a.modifiedDate.compareTo(b.modifiedDate));
 
-    return resultList;
+    for (var e in resultList) {
+      resultThumbnailList.add(await PhotoGallery.getThumbnail(mediumId: e.id));
+    }
+
+    return Tuple2<List<Medium>, List<dynamic>>(resultList, resultThumbnailList);
   }
 
   OverlayEntry _buildMentionsOverlayEntry() {
@@ -1501,11 +1513,13 @@ class _SendingAttachment {
   PlatformFile file;
   Attachment attachment;
   bool uploaded;
+  String id;
 
   _SendingAttachment({
     this.file,
     this.attachment,
     this.uploaded = false,
+    this.id,
   });
 }
 
@@ -1514,3 +1528,44 @@ extension StringExtension on String {
     return "${this[0].toUpperCase()}${this.substring(1)}";
   }
 }
+
+/// Represents a 2-tuple, or pair.
+class Tuple2<T1, T2> {
+  /// Returns the first item of the tuple
+  final T1 item1;
+
+  /// Returns the second item of the tuple
+  final T2 item2;
+
+  /// Creates a new tuple value with the specified items.
+  const Tuple2(this.item1, this.item2);
+
+  /// Create a new tuple value with the specified list [items].
+  factory Tuple2.fromList(List items) {
+    if (items.length != 2) {
+      throw ArgumentError('items must have length 2');
+    }
+
+    return Tuple2<T1, T2>(items[0] as T1, items[1] as T2);
+  }
+
+  /// Returns a tuple with the first item set to the specified value.
+  Tuple2<T1, T2> withItem1(T1 v) => Tuple2<T1, T2>(v, item2);
+
+  /// Returns a tuple with the second item set to the specified value.
+  Tuple2<T1, T2> withItem2(T2 v) => Tuple2<T1, T2>(item1, v);
+
+  /// Creates a [List] containing the items of this [Tuple2].
+  ///
+  /// The elements are in item order. The list is variable-length
+  /// if [growable] is true.
+  List toList({bool growable = false}) =>
+      List.from([item1, item2], growable: growable);
+
+  @override
+  String toString() => '[$item1, $item2]';
+
+  @override
+  bool operator ==(Object other) =>
+      other is Tuple2 && other.item1 == item1 && other.item2 == item2;
+}