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Merge in the flutter gallery (flutter#176)
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‎gallery/README.md

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# Flutter Gallery
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Flutter Gallery is a resource to help developers evaluate and use Flutter.
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It is a collection of material design widgets, behaviors, and vignettes
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implemented with Flutter. We often get asked how one can see Flutter in
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action, and this gallery demonstrates what Flutter provides and how it
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behaves in the wild.
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## Supported Platforms
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The Flutter Gallery application has been built to support multiple platforms. This includes:
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* Android
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* iOS
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* web
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* macOS
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* Linux
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* Windows
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That being said, extra steps must be taken to [enable Desktop support](https://github.com/flutter/flutter/wiki/Desktop-shells#tooling).
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Additionally, the UI adapts between mobile and desktop layouts regardless of the platform it runs on. This is determined based on window size as outlined in [adaptive.dart](https://github.com/material-components/material-components-flutter-gallery/blob/master/gallery/lib/layout/adaptive.dart).
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## To include a new splash animation
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1. Convert your animation to a `.gif` file. Ideally, use a background color of `0xFF030303` to ensure the animation blends into the background of the app.
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2. Add your new `.gif` file to the assets directory under `assets/splash_effects`. Ensure the name follows the format `splash_effect_$num.gif`. The number should be the next number after the current largest number in the repository.
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3. Update the map `_effectDurations` in [splash.dart](https://github.com/material-components/material-components-flutter-gallery/blob/master/gallery/lib/pages/splash.dart) to include the number of the new `.gif` as well as its estimated duration. The duration is used to determine how long to display the splash animation at launch.

‎gallery/codeviewer_cli/.gitignore

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# Files and directories created by pub
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.dart_tool/
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.packages
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# Remove the following pattern if you wish to check in your lock file
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pubspec.lock
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# Conventional directory for build outputs
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build/
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# Directory created by dartdoc
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doc/api/

‎gallery/codeviewer_cli/CHANGELOG.md

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## 1.0.0
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- Initial version

‎gallery/codeviewer_cli/README.md

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A command-line application to highlight dart source code.
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## Overview
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Code segments are highlighted before the app is compiled.
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This is done because the highlighting process can take 300ms to finish, creating a noticeable delay when the demo switches to code page.
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The highlighter takes all files in the `gallery/lib/demos/` folder and scans each.
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Highlighted code widgets are stored in the `gallery/lib/codeviewer/code_segments.dart` file.
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Under the root directory, run `make update-code-segments` to run the highlighter.
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Wrap a block of code with lines `// BEGIN yourDemoName` and `// END` to mark it for highlighting. The block in between, as well as any copyright notice and imports at the beginning of the file, are automatically taken and highlighted, and stored as `static TextSpan yourDemoName(BuildContext context)` in `gallery/lib/codeviewer/code_segments.dart`.
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To display the code, go to `gallery/lib/data/demos.dart`, and add `code: CodeSegments.yourDemoName,` to your `GalleryDemoConfiguration` object.
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## Multiple blocks of code
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Use the following method to join multiple blocks of code into a single segment:
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```
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// BEGIN yourDemo#2
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a();
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// END
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b();
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// BEGIN yourDemo#1
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c();
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// END
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```
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The generated code will be
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```
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c();
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a();
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```
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Code blocks can nest or overlap. In these cases, specify which file(s) to `END`.
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The following source file
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```
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// BEGIN demoOne
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a();
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// BEGIN demoTwo
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b();
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// END demoOne
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c();
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// END demoTwo
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```
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will create the following segments:
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(demoOne)
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```
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a();
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b();
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```
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(demoTwo)
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```
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b();
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c();
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```

‎gallery/codeviewer_cli/analysis_options.yaml

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# Defines a default set of lint rules enforced for
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# projects at Google. For details and rationale,
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# see https://github.com/dart-lang/pedantic#enabled-lints.
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include: package:pedantic/analysis_options.yaml
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# For lint rules and documentation, see http://dart-lang.github.io/linter/lints.
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# Uncomment to specify additional rules.
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# linter:
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# rules:
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# - camel_case_types
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analyzer:
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# exclude:
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# - path/to/excluded/files/**
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linter:
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rules:
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- avoid_types_on_closure_parameters
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- avoid_void_async
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- await_only_futures
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- camel_case_types
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- cancel_subscriptions
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- close_sinks
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- constant_identifier_names
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- control_flow_in_finally
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- empty_statements
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- hash_and_equals
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- implementation_imports
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- non_constant_identifier_names
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- package_api_docs
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- package_names
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- package_prefixed_library_names
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- test_types_in_equals
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- throw_in_finally
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- unnecessary_brace_in_string_interps
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- unnecessary_getters_setters
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- unnecessary_new
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- unnecessary_statements
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- directives_ordering

‎gallery/codeviewer_cli/bin/main.dart

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// Copyright 2019 The Flutter team. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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import 'package:codeviewer_cli/segment_generator.dart';
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main(List<String> arguments) {
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writeSegments(
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sourceDirectoryPath: '../gallery/lib/demos',
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targetFilePath: '../gallery/lib/codeviewer/code_segments.dart',
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);
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}

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