fix: attachment builder (#326)

* feat: Changed attachment builder structure

* fix: fixed image attachments

* feat: Added onTaps to remaining attachments

* fix: merged fixes

* add trailing comma

Co-authored-by: Salvatore Giordano <[email protected]>

packages/stream_chat_flutter/lib/src/attachment/giphy_attachment.dart

@@ -15,6 +15,7 @@ class GiphyAttachment extends AttachmentWidget {
   final MessageTheme messageTheme;
   final ShowMessageCallback onShowMessage;
   final ValueChanged<ReturnActionType> onReturnAction;
+  final VoidCallback onAttachmentTap;
 
   const GiphyAttachment({
     Key key,
@@ -24,6 +25,7 @@ class GiphyAttachment extends AttachmentWidget {
     this.messageTheme,
     this.onShowMessage,
     this.onReturnAction,
+    this.onAttachmentTap,
   }) : super(key: key, message: message, attachment: attachment, size: size);
 
   @override
@@ -65,7 +67,7 @@ class GiphyAttachment extends AttachmentWidget {
                   Padding(
                     padding: const EdgeInsets.all(8.0),
                     child: GestureDetector(
-                      onTap: () => _onImageTap(context),
+                      onTap: () => onAttachmentTap ?? _onImageTap(context),
                       child: ClipRRect(
                         borderRadius: BorderRadius.only(
                           topLeft: Radius.circular(8),