feat: allow to create widgets

- supported widget types: therpad, jitsi, video, custom
- update Matrix SDK

Signed-off-by: TheOneWithTheBraid <the-one@with-the-braid.cf>

lib/pages/chat/add_widget_tile.dart

@@ -0,0 +1,85 @@
+import 'package:flutter/material.dart';
+
+import 'package:flutter_gen/gen_l10n/l10n.dart';
+import 'package:matrix/matrix.dart';
+import 'package:matrix/widget.dart';
+
+import 'package:fluffychat/pages/chat/add_widget_tile_view.dart';
+
+class AddWidgetTile extends StatefulWidget {
+  final Room room;
+
+  const AddWidgetTile({Key? key, required this.room}) : super(key: key);
+
+  @override
+  State<AddWidgetTile> createState() => AddWidgetTileState();
+}
+
+class AddWidgetTileState extends State<AddWidgetTile> {
+  final TextEditingController urlController = TextEditingController();
+  final TextEditingController nameController = TextEditingController();
+  String widgetType = 'm.etherpad';
+
+  late final bool initiallyExpanded;
+
+  String? nameError;
+  String? urlError;
+
+  @override
+  void initState() {
+    initiallyExpanded = widget.room.widgets.isEmpty;
+    super.initState();
+  }
+
+  void setWidgetType(String value) => setState(() => widgetType = value);
+
+  void addWidget() {
+    try {
+      nameError = null;
+      urlError = null;
+
+      final room = widget.room;
+      final name = nameController.text;
+      final uri = Uri.tryParse(urlController.text);
+
+      if (name.length < 3) {
+        setState(() {
+          nameError = L10n.of(context)!.widgetNameError;
+        });
+        return;
+      }
+
+      if (uri == null || uri.scheme != 'https') {
+        setState(() {
+          urlError = L10n.of(context)!.widgetUrlError;
+        });
+        return;
+      }
+      setState(() {});
+
+      late MatrixWidget matrixWidget;
+      switch (widgetType) {
+        case 'm.etherpad':
+          matrixWidget = MatrixWidget.etherpad(room, name, uri);
+          break;
+        case 'm.jitsi':
+          matrixWidget = MatrixWidget.jitsi(room, name, uri);
+          break;
+        case 'm.video':
+          matrixWidget = MatrixWidget.video(room, name, uri);
+          break;
+        default:
+          matrixWidget = MatrixWidget.custom(room, name, uri);
+          break;
+      }
+      widget.room.addWidget(matrixWidget);
+      Navigator.of(context).pop();
+    } catch (e) {
+      ScaffoldMessenger.of(context).showSnackBar(
+          SnackBar(content: Text(L10n.of(context)!.errorAddingWidget)));
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) => AddWidgetTileView(controller: this);
+}