[file_selector] initial implementation

packages/file_selector/file_selector/CHANGELOG.md

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+## 0.7.0
+
+* Initial Open Source release.

packages/file_selector/file_selector/LICENSE

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+Copyright 2020 The Flutter Authors. All rights reserved.
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+    * Redistributions of source code must retain the above copyright
+      notice, this list of conditions and the following disclaimer.
+    * Redistributions in binary form must reproduce the above
+      copyright notice, this list of conditions and the following
+      disclaimer in the documentation and/or other materials provided
+      with the distribution.
+    * Neither the name of Google Inc. nor the names of its
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

packages/file_selector/file_selector/README.md

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+# file_selector
+
+[![pub package](https://img.shields.io/pub/v/file_selector.svg)](https://pub.dartlang.org/packages/file_selector)
+
+A Flutter plugin that manages files and interactions with file dialogs.
+
+## Usage
+To use this plugin, add `file_selector` as a [dependency in your pubspec.yaml file](https://flutter.dev/platform-plugins/).
+
+### Examples
+Here are small examples that show you how to use the API.  
+Please also take a look at our [example][example] app.
+
+#### Open a single file
+``` dart
+final typeGroup = XTypeGroup(label: 'images', extensions: ['jpg', 'png']);
+final file = await openFile(acceptedTypeGroups: [typeGroup]);
+```
+
+#### Open multiple files at once
+``` dart
+final typeGroup = XTypeGroup(label: 'images', extensions: ['jpg', 'png']);
+final files = await openFiles(acceptedTypeGroups: [typeGroup]);
+```
+
+#### Saving a file
+```dart
+final path = await getSavePath();
+final name = "hello_file_selector.txt";
+final data = Uint8List.fromList("Hello World!".codeUnits);
+final mimeType = "text/plain";
+final file = XFile.fromData(data, name: name, mimeType: mimeType);
+await file.saveTo(path);
+```
+
+[example]:./example

packages/file_selector/file_selector/example/.gitignore

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+# Miscellaneous
+*.class
+*.log
+*.pyc
+*.swp
+.DS_Store
+.atom/
+.buildlog/
+.history
+.svn/
+
+# IntelliJ related
+*.iml
+*.ipr
+*.iws
+.idea/
+
+# The .vscode folder contains launch configuration and tasks you configure in
+# VS Code which you may wish to be included in version control, so this line
+# is commented out by default.
+#.vscode/
+
+# Flutter/Dart/Pub related
+**/doc/api/
+**/ios/Flutter/.last_build_id
+.dart_tool/
+.flutter-plugins
+.flutter-plugins-dependencies
+.packages
+.pub-cache/
+.pub/
+/build/
+
+# Web related
+lib/generated_plugin_registrant.dart
+
+# Symbolication related
+app.*.symbols
+
+# Obfuscation related
+app.*.map.json
+
+# Currently only web supported
+android/
+ios/
+
+# Exceptions to above rules.
+!/packages/flutter_tools/test/data/dart_dependencies_test/**/.packages

packages/file_selector/file_selector/example/.metadata

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+# This file tracks properties of this Flutter project.
+# Used by Flutter tool to assess capabilities and perform upgrades etc.
+#
+# This file should be version controlled and should not be manually edited.
+
+version:
+  revision: 7736f3bc90270dcb0480db2ccffbf1d13c28db85
+  channel: dev
+
+project_type: app

packages/file_selector/file_selector/example/README.md

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+# file_selector_example
+
+Demonstrates how to use the file_selector plugin.
+
+## Getting Started
+
+For help getting started with Flutter, view our online
+[documentation](https://flutter.dev/).

packages/file_selector/file_selector/example/lib/home_page.dart

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+import 'package:flutter/material.dart';
+
+/// Home Page of the application
+class HomePage extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: Text('File Selector Demo Home Page'),
+      ),
+      body: Center(
+        child: Column(
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: <Widget>[
+            RaisedButton(
+              color: Colors.blue,
+              textColor: Colors.white,
+              child: Text('Open a text file'),
+              onPressed: () => Navigator.pushNamed(context, '/open/text'),
+            ),
+            SizedBox(height: 10),
+            RaisedButton(
+              color: Colors.blue,
+              textColor: Colors.white,
+              child: Text('Open an image'),
+              onPressed: () => Navigator.pushNamed(context, '/open/image'),
+            ),
+            SizedBox(height: 10),
+            RaisedButton(
+              color: Colors.blue,
+              textColor: Colors.white,
+              child: Text('Open multiple images'),
+              onPressed: () => Navigator.pushNamed(context, '/open/images'),
+            ),
+            SizedBox(height: 10),
+            RaisedButton(
+              color: Colors.blue,
+              textColor: Colors.white,
+              child: Text('Save text into a file'),
+              onPressed: () => Navigator.pushNamed(context, '/save/text'),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}

packages/file_selector/file_selector/example/lib/main.dart

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+import 'package:flutter/material.dart';
+import 'package:example/home_page.dart';
+import 'package:example/save_text_page.dart';
+import 'package:example/open_text_page.dart';
+import 'package:example/open_image_page.dart';
+import 'package:example/open_multiple_images_page.dart';
+
+void main() {
+  runApp(MyApp());
+}
+
+/// MyApp is the Main Application
+class MyApp extends StatelessWidget {
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      title: 'File Selector Demo',
+      theme: ThemeData(
+        primarySwatch: Colors.blue,
+        visualDensity: VisualDensity.adaptivePlatformDensity,
+      ),
+      home: HomePage(),
+      routes: {
+        '/save/text': (context) => SaveTextPage(),
+        '/open/text': (context) => OpenTextPage(),
+        '/open/image': (context) => OpenImagePage(),
+        '/open/images': (context) => OpenMultipleImagesPage(),
+      },
+    );
+  }
+}

packages/file_selector/file_selector/example/lib/open_image_page.dart

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+import 'dart:io';
+import 'package:flutter/foundation.dart';
+import 'package:file_selector/file_selector.dart';
+import 'package:flutter/material.dart';
+
+/// Screen that shows an example of openFile(s)
+class OpenImagePage extends StatelessWidget {
+  void _openImageFile(BuildContext context) async {
+    final XTypeGroup typeGroup = XTypeGroup(
+      label: 'images',
+      extensions: ['jpg', 'png'],
+    );
+    final List<XFile> files = await openFiles(acceptedTypeGroups: [typeGroup]);
+    final XFile file = files[0];
+    final String fileName = file.name;
+    final String filePath = file.path;
+
+    await showDialog(
+      context: context,
+      builder: (context) => ImageDisplay(fileName, filePath),
+    );
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: Text("Open an image"),
+      ),
+      body: Center(
+        child: Column(
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: <Widget>[
+            RaisedButton(
+              color: Colors.blue,
+              textColor: Colors.white,
+              child: Text('Press to open an image file(png, jpg)'),
+              onPressed: () => _openImageFile(context),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}
+
+/// Widget that displays a text file in a dialog
+class ImageDisplay extends StatelessWidget {
+  /// Image's name
+  final String fileName;
+
+  /// Image's path
+  final String filePath;
+
+  /// Default Constructor
+  ImageDisplay(this.fileName, this.filePath);
+
+  @override
+  Widget build(BuildContext context) {
+    return AlertDialog(
+      title: Text(fileName),
+      // On web the filePath is a blob url
+      // while on other platforms it is a system path.
+      content: kIsWeb ? Image.network(filePath) : Image.file(File(filePath)),
+      actions: [
+        FlatButton(
+          child: const Text('Close'),
+          onPressed: () {
+            Navigator.pop(context);
+          },
+        ),
+      ],
+    );
+  }
+}

packages/file_selector/file_selector/example/lib/open_multiple_images_page.dart

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+import 'dart:io';
+import 'package:flutter/foundation.dart';
+import 'package:file_selector/file_selector.dart';
+import 'package:flutter/material.dart';
+
+/// Screen that shows an example of openFile(s)
+class OpenMultipleImagesPage extends StatelessWidget {
+  void _openImageFile(BuildContext context) async {
+    final XTypeGroup jpgsTypeGroup = XTypeGroup(
+      label: 'images',
+      extensions: ['jpg', 'jpeg'],
+    );
+    final XTypeGroup pngTypeGroup = XTypeGroup(
+      extensions: ['png'],
+    );
+    final List<XFile> files = await openFiles(acceptedTypeGroups: [
+      jpgsTypeGroup,
+      pngTypeGroup,
+    ]);
+    await showDialog(
+      context: context,
+      builder: (context) => MultipleImagesDisplay(files),
+    );
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: Text("Open multiple images"),
+      ),
+      body: Center(
+        child: Column(
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: <Widget>[
+            RaisedButton(
+              color: Colors.blue,
+              textColor: Colors.white,
+              child: Text('Press to open multiple images (png, jpg)'),
+              onPressed: () => _openImageFile(context),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}
+
+/// Widget that displays a text file in a dialog
+class MultipleImagesDisplay extends StatelessWidget {
+  /// The files containing the images
+  final List<XFile> files;
+
+  /// Default Constructor
+  MultipleImagesDisplay(this.files);
+
+  @override
+  Widget build(BuildContext context) {
+    return AlertDialog(
+      title: Text('Gallery'),
+      // On web the filePath is a blob url
+      // while on other platforms it is a system path.
+      content: Center(
+        child: Row(
+          children: <Widget>[
+            ...files.map(
+              (file) => Flexible(
+                  child: kIsWeb
+                      ? Image.network(file.path)
+                      : Image.file(File(file.path))),
+            )
+          ],
+        ),
+      ),
+      actions: [
+        FlatButton(
+          child: const Text('Close'),
+          onPressed: () {
+            Navigator.pop(context);
+          },
+        ),
+      ],
+    );
+  }
+}