Video page added

Author: MichaelVerdon

packages/firebase_vertexai/firebase_vertexai/example/assets/videos/landscape.mp4

@@ -0,0 +1,121 @@
+// Copyright 2025 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+import 'dart:typed_data';
+
+import 'package:flutter/material.dart';
+import 'package:firebase_vertexai/firebase_vertexai.dart';
+import 'package:flutter/services.dart';
+import '../widgets/message_widget.dart';
+
+class VideoPage extends StatefulWidget {
+  const VideoPage({super.key, required this.title, required this.model});
+
+  final String title;
+  final GenerativeModel model;
+
+  @override
+  State<VideoPage> createState() => _VideoPageState();
+}
+
+class _VideoPageState extends State<VideoPage> {
+  ChatSession? chat;
+  late final GenerativeModel model;
+  final List<MessageData> _messages = <MessageData>[];
+  bool _loading = false;
+
+  @override
+  void initState() {
+    super.initState();
+    chat = widget.model.startChat();
+  }
+
+  Future<void> _testVideo(model) async {
+    try {
+      ByteData videoBytes =
+          await rootBundle.load('assets/videos/landscape.mp4');
+
+      const _prompt =
+          'Can you tell me what is in the video?';
+
+      final prompt = TextPart(_prompt);
+
+      setState(() {
+        _messages.add(MessageData(text: _prompt, fromUser: true));
+      });
+
+      final videoPart = InlineDataPart('video/mp4', videoBytes.buffer.asUint8List());
+
+      final response = await widget.model.generateContent([
+        Content.multi([prompt, videoPart]),
+      ]);
+
+      setState((){
+        _messages.add(MessageData(text: response.text, fromUser: false));
+      });
+      
+    } catch (e) {
+      print('Error sending video to model: $e');
+    }
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: Text(widget.title),
+      ),
+      body: Padding(
+        padding: const EdgeInsets.all(8),
+        child: Column(
+          mainAxisAlignment: MainAxisAlignment.center,
+          crossAxisAlignment: CrossAxisAlignment.start,
+          children: [
+            Expanded(
+              child: ListView.builder(
+                itemBuilder: (context, idx) {
+                  return MessageWidget(
+                    text: _messages[idx].text,
+                    isFromUser: _messages[idx].fromUser ?? false,
+                  );
+                },
+                itemCount: _messages.length,
+              ),
+            ),
+            Padding(
+              padding: const EdgeInsets.symmetric(
+                vertical: 25,
+                horizontal: 15,
+              ),
+              child: Row(
+                children: [
+                  Expanded(
+                    child: ElevatedButton(
+                      onPressed: !_loading
+                          ? () async {
+                              await _testVideo(widget.model);
+                            }
+                          : null,
+                      child: const Text('Test Video Prompt'),
+                    ),
+                  ),
+                ],
+              ),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}