Get and show the list of conversations

lib/ui/tiles/conversation_tile.dart

@@ -0,0 +1,55 @@
+import 'package:comunic/models/conversation.dart';
+import 'package:comunic/utils/intl_utils.dart';
+import 'package:flutter/material.dart';
+
+/// Single conversation tile
+///
+/// @author Pierre HUBERT
+
+class ConversationTile extends StatelessWidget {
+  final Conversation conversation;
+
+  const ConversationTile({Key key, this.conversation}) : super(key: key);
+
+  _buildSubInformation(IconData icon, String content) {
+    return Row(
+      children: <Widget>[
+        Icon(
+          icon,
+          size: 15.0,
+          color: Colors.grey,
+        ),
+        Text(" " + content),
+      ],
+    );
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return ListTile(
+      title: Text(conversation.name == null ? "Unknown" : conversation.name),
+      leading: Icon(
+        conversation.sawLastMessage ? Icons.check_circle : Icons.lens,
+        color: conversation.sawLastMessage ? null : Colors.blue,
+      ),
+      isThreeLine: true,
+      subtitle: Column(
+        crossAxisAlignment: CrossAxisAlignment.stretch,
+        children: <Widget>[
+          _buildSubInformation(Icons.access_time, "time"), //TODO : improve the way the time is shown
+          _buildSubInformation(
+            Icons.group,
+            conversation.members.length == 1
+                ? tr("1 member")
+                : tr(
+                    "%num% members",
+                    args: {
+                      "num": conversation.members.length.toString(),
+                    },
+                  ),
+          ),
+        ],
+      ),
+    );
+  }
+}