Initial project setup

.analysis_options

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+analyzer:
+  strong-mode: true
+  language:
+    enableStrictCallChecks: true
+    enableSuperMixins: true
+  errors:
+    # treat missing required parameters as a warning (not a hint)
+    missing_required_param: warning
+    # Allow having TODOs in the code
+    todo: ignore
+
+linter:
+  rules:
+    # these rules are documented on and in the same order as
+    # the Dart Lint rules page to make maintenance easier
+    # http://dart-lang.github.io/linter/lints/
+
+    # === error rules ===
+    - avoid_empty_else
+    - comment_references
+    - cancel_subscriptions
+    - close_sinks
+    - control_flow_in_finally
+    - empty_statements
+    - hash_and_equals
+    - invariant_booleans
+    - iterable_contains_unrelated_type
+    - list_remove_unrelated_type
+    - literal_only_boolean_expressions
+    - test_types_in_equals
+    - throw_in_finally
+    - unrelated_type_equality_checks
+    - valid_regexps
+
+    # === style rules ===
+    - always_declare_return_types
+    - always_specify_types
+    - annotate_overrides
+    # TODO - avoid_as
+    - avoid_init_to_null
+    - avoid_return_types_on_setters
+    - await_only_futures
+    - camel_case_types
+    - constant_identifier_names
+    - control_flow_in_finally
+    - empty_catches
+    - empty_constructor_bodies
+    - implementation_imports
+    - library_names
+    - library_prefixes
+    - non_constant_identifier_names
+    - one_member_abstracts
+    - only_throw_errors
+    - overridden_fields
+    - package_api_docs
+    - package_prefixed_library_names
+    - prefer_is_not_empty
+    - public_member_api_docs
+    - slash_for_doc_comments
+    - sort_constructors_first
+    - sort_unnamed_constructors_first
+    - super_goes_last
+    - type_annotate_public_apis
+    - type_init_formals
+    # TODO - unawaited_futures (https://github.com/dart-lang/linter/issues/419)
+    - unnecessary_brace_in_string_interp
+    - unnecessary_getters_setters
+
+    # === pub rules ===
+    - package_names

.gitattributes

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+# Auto detect text files and perform LF normalization
+*        text=auto
+
+# Always perform LF normalization on these files
+*.dart   text
+*.gradle text
+*.html   text
+*.java   text
+*.json   text
+*.md     text
+*.py     text
+*.sh     text
+*.txt    text
+*.xml    text
+*.yaml   text
+
+# Make sure that these Windows files always have CRLF line endings in checkout
+*.bat    text eol=crlf
+*.ps1    text eol=crlf
+
+# Never perform LF normalization on these files
+*.ico    binary
+*.jar    binary
+*.png    binary
+*.zip    binary

.gitignore

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+### Dart template
+# Don’t commit the following directories created by pub.
+.buildlog
+.pub/
+build/
+packages
+.packages
+
+# Or the files created by dart2js.
+*.dart.js
+*.js_
+*.js.deps
+*.js.map
+
+# Include when developing application packages.
+pubspec.lock
+
+# IDE
+.project
+.settings
+.idea
+.c9

.travis.yml

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+language: dart
+sudo: false
+dart:
+  - stable
+  - dev
+script: ./tool/travis.sh

AUTHORS

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+# Below is a list of people and organizations that have contributed
+# to the Flutter project. Names should be added to the list like so:
+#
+#   Name/Organization <email address>
+
+Google Inc.

CONTRIBUTING.md

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+Contributing to Flutter Widgets
+===============================
+
+_See also: [Flutter's code of conduct](https://flutter.io/design-principles/#code-of-conduct)_
+
+Things you will need
+--------------------
+
+ * Linux, Mac OS X, or Windows.
+ * git (used for source version control).
+ * An ssh client (used to authenticate with GitHub).
+
+Getting the code and configuring your environment
+-------------------------------------------------
+
+ * Ensure all the dependencies described in the previous section are installed.
+ * Fork `https://github.com/google/flutter.widgets` into your own GitHub account.
+   If you already have a fork and are now installing a development environment on
+   a new machine, make sure you've updated your fork so that you don't use stale
+   configuration options from long ago.
+ * If you haven't configured your machine with an SSH key that's known to github, then
+   follow [GitHub's directions](https://help.github.com/articles/generating-ssh-keys/)
+   to generate an SSH key.
+ * `git clone git@github.com:<your_name_here>/flutter.widgets.git`
+ * `cd widgets`
+ * `git remote add upstream git@github.com:google/flutter.widgets.git`
+   (So that you fetch from the master repository, not your clone, when running
+   `git fetch` et al.)
+
+Contributing code
+-----------------
+
+We gladly accept contributions via GitHub pull requests.
+
+Please peruse Flutter's
+[style guide](https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo) and
+[design principles](https://flutter.io/design-principles/) before
+working on anything non-trivial. These guidelines are intended to
+keep the code consistent and avoid common pitfalls.
+
+To start working on a patch:
+
+ * `git fetch upstream`
+ * `git checkout upstream/master -b <name_of_your_branch>`
+ * Hack away.
+ * `git commit -a -m "<your informative commit message>"`
+ * `git push origin <name_of_your_branch>`
+
+To send us a pull request:
+
+* `git pull-request` (if you are using [Hub](http://github.com/github/hub/)) or
+  go to `https://github.com/google/flutter.widgets` and click the
+  "Compare & pull request" button
+
+Please make sure all your checkins have detailed commit messages explaining the patch.
+
+Once you've gotten an LGTM from a project maintainer and once your PR has received
+the green light from all our automated testing (Travis, Appveyor, etc), submit your
+changes to the `master` branch using one of the following methods:
+
+* Wait for one of the project maintainers to submit it for you.
+* Click the green "Merge pull request" button on the GitHub UI of your pull
+  request (requires commit access).
+
+You must complete the
+[Contributor License Agreement](https://cla.developers.google.com/clas).
+You can do this online, and it only takes a minute.
+If you've never submitted code before, you must add your (or your
+organization's) name and contact info to the [AUTHORS](AUTHORS) file.

LICENSE

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+Copyright 2017 Google, Inc. 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.

README.md

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+# Flutter widgets
+
+[![Build Status](https://travis-ci.org/google/flutter.widgets.svg?branch=master)](https://travis-ci.org/google/flutter.widgets)
+
+This repository contains the source code for various Flutter widgets that are
+developed by Google but not by the core Flutter team.
+
+## Issues
+
+Please file any issues, bugs, or feature requests in the [this
+repo](https://github.com/google/flutter.widgets/issues/new).
+
+## Contributing
+
+If you wish to contribute a change to any of the existing widgets in this repo,
+please review our [contribution guide](https://github.com/google/flutter.widgets/blob/master/CONTRIBUTING.md),
+and send a [pull request](https://github.com/google/flutter.widgets/pulls).

appveyor.yml

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+install:
+  - choco install dart-sdk
+  - ps: refreshenv
+  - refreshenv
+  - set DART_DIR=c:\tools\dart-sdk\bin
+  - set PUB_EXECUTABLE=pub.bat
+  - ps: pwd
+  - pub get
+
+build: off
+
+test_script:
+  - pub run test

tool/travis.sh

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+#!/bin/bash
+
+# Make sure dartfmt is run on everything
+echo "Checking dartfmt..."
+NEEDS_DARTFMT="$(dartfmt -n lib test tool)"
+if [[ ${NEEDS_DARTFMT} != "" ]]
+then
+  echo "FAILED"
+  echo "${NEEDS_DARTFMT}"
+  exit 1
+fi
+echo "PASSED"
+
+# Make sure we pass the analyzer
+echo "Checking dartanalyzer..."
+FAILS_ANALYZER="$(find lib test tool -name "*.dart" | xargs dartanalyzer --options .analysis_options)"
+if [[ $FAILS_ANALYZER == *"[error]"* ]]
+then
+  echo "FAILED"
+  echo "${FAILS_ANALYZER}"
+  exit 1
+fi
+echo "PASSED"
+
+# Fast fail the script on failures.
+set -e
+
+# Run the tests.
+pub run test