Can cancel membership request

lib/ui/widgets/group_membership_widget.dart

@@ -0,0 +1,82 @@
+import 'package:comunic/helpers/groups_helper.dart';
+import 'package:comunic/models/group.dart';
+import 'package:comunic/ui/widgets/safe_state.dart';
+import 'package:comunic/utils/intl_utils.dart';
+import 'package:comunic/utils/ui_utils.dart';
+import 'package:flutter/gestures.dart';
+import 'package:flutter/material.dart';
+
+/// Group membership information widget
+///
+/// @author Pierre Hubert
+
+class GroupMembershipWidget extends StatefulWidget {
+  final Group group;
+  final Function() onUpdated;
+
+  const GroupMembershipWidget({
+    @required this.group,
+    this.onUpdated,
+  }) : assert(group != null);
+
+  @override
+  _GroupMembershipWidgetState createState() => _GroupMembershipWidgetState();
+}
+
+class _GroupMembershipWidgetState extends SafeState<GroupMembershipWidget> {
+  Group get group => widget.group;
+
+  int get _id => group.id;
+
+  GroupMembershipLevel get _level => group.membershipLevel;
+
+  @override
+  Widget build(BuildContext context) {
+    switch (_level) {
+      case GroupMembershipLevel.ADMINISTRATOR:
+        return Text(tr("Administrator"));
+
+      case GroupMembershipLevel.MODERATOR:
+        return Text(tr("Moderator"));
+
+      case GroupMembershipLevel.MEMBER:
+        return Text(tr("Member"));
+
+      case GroupMembershipLevel.INVITED:
+        // TODO: Handle this case.
+        break;
+      case GroupMembershipLevel.PENDING:
+        return _buildPendingState();
+
+      case GroupMembershipLevel.VISITOR:
+        // TODO: Handle this case.
+        break;
+    }
+  }
+
+  /// Build pending state
+  Widget _buildPendingState() {
+    return RichText(
+      text: TextSpan(children: [
+        TextSpan(text: tr("Requested") + " "),
+        TextSpan(
+            text: tr("Cancel"),
+            style: TextStyle(color: Colors.blue),
+            recognizer: TapGestureRecognizer()..onTap = () => _cancelRequest()),
+      ]),
+    );
+  }
+
+  /// Cancel group membership request
+  void _cancelRequest() async {
+    if (!await GroupsHelper().cancelRequest(_id))
+      showSimpleSnack(context, tr("Could not cancel your membership request!"));
+    else {
+      // Refresh state
+      group.membershipLevel = GroupMembershipLevel.VISITOR;
+      this.setState(() {});
+
+      if (this.widget.onUpdated != null) this.widget.onUpdated();
+    }
+  }
+}