Merge pull request #167 from Yuvaraj-Gajaraj/master

Added new controls

Author: JayavigneshwaranG

LICENSE

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+Syncfusion License
+
+Syncfusion Flutter Charts package is available under the Syncfusion Essential Studio program, and can be licensed either under the Syncfusion Community License Program or the Syncfusion commercial license.
+
+To be qualified for the Syncfusion Community License Program you must have a gross revenue of less than one (1) million U.S. dollars ($1,000,000.00 USD) per year and have less than five (5) developers in your organization, and agree to be bound by Syncfusion’s terms and conditions. 
+ 
+Customers who do not qualify for the community license can contact [email protected] for commercial licensing options.
+
+Under no circumstances can you use this product without (1) either a Community License or a commercial license and (2) without agreeing and abiding by Syncfusion’s license containing all terms and conditions. 
+ 
+The Syncfusion license that contains the terms and conditions can be found at 
+https://www.syncfusion.com/content/downloads/syncfusion_license.pdf
+
+Syncfusion provides implementation but you would subsequently need to have a license to use Flutter. The Flutter engine must be licensed from google directly. We do not license Flutter or the Flutter Engine and provide no license or rights even if you end up with the binaries from us by mistake.

README.md

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+# Syncfusion Flutter Examples
+
+This repository contains the demos of Syncfusion Flutter UI widgets. This is the best place to check our widgets to get more insight about the usage of APIs. You can also check our widgets by installing the [sample browser application](https://play.google.com/store/apps/details?id=com.syncfusion.flutter.examples&hl=en) from Google Play Store, in which you can browse the demos for all the available widgets and view the source code of each example within the app itself.
+
+![showcase_image](https://cdn.syncfusion.com/content/images/FTControl/screen2.png)
+
+This section guides you how to use the Syncfusion Flutter examples in your applications.
+
+## Table of contents
+
+* [Requirements to run the demo](#requirements-to-run-the-demo)
+* [Repository structure](#repository-structure)
+* [Using the samples](#using-the-samples)
+* [Support and feedback](#support-and-feedback)
+* [Screenshots](#screenshots)
+* [Disclaimer](#disclaimer)
+* [About Syncfusion](#about-syncfusion)
+
+## <a name="requirements-to-run-the-demo"></a>Requirements to run the demo ##
+
+* [Flutter SDK](https://flutter.dev/docs/get-started/install/windows)
+* [Android studio](https://developer.android.com/studio/install) or [Visual studio code](https://code.visualstudio.com/download)
+* Install Flutter extension in Android studio or in [VS code](https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter)
+
+## <a name="repository-structure"></a>Repository structure ##
+
+This repository contains sample browser project. Each widgets sample will be found inside the lib/samples folder. Run this project to see the demo samples of all the Flutter widgets in single application.
+
+## <a name="using-the-samples"></a>Using the samples ##
+
+* Download or clone the files in repository.
+* Get the required packages referred in the project.
+
+## <a name="support-and-feedback"></a>Support and Feedback ##
+
+* For any other queries, reach our [Syncfusion support team](https://www.syncfusion.com/support/directtrac/incidents/newincident?utm_source=github&utm_medium=flutter_widgets) or post the queries through the [Community forums](https://www.syncfusion.com/forums?utm_source=github&utm_medium=flutter_widgets) and submit a feature request or a bug through our [Feedback portal](https://www.syncfusion.com/feedback/flutter).
+* To renew the subscription, click [renew](https://www.syncfusion.com/sales/products?utm_source=github&utm_medium=flutter_widgets) or contact our sales team at <[email protected]>.
+
+## <a name='screenshots'></a>Screenshots ##
+
+### Chart types
+<p align="center">
+    <img src="https://cdn.syncfusion.com/content/images/FTControl/chartTypes.png" alt="Chart Types"/>
+</p>
+
+### Axis types
+<p align="center">    
+    <img src="https://cdn.syncfusion.com/content/images/FTControl/axisTypes.png" alt="Axis Types"/>
+</p>
+
+### User interactions
+<p align="center">
+    <img src="https://cdn.syncfusion.com/content/images/FTControl/userInteraction.gif" alt="User Interaction"/>
+</p>
+
+## <a name="disclaimer"></a>Disclaimer ##
+
+Syncfusion has no liability for any damage or consequence that may arise by the use or viewing of the examples. The examples are for demonstrative purposes and if you choose to use or access the examples you agree to not hold Syncfusion liable, in any form, for any damage that is related to use, accessing or otherwise viewing the examples. By accessing, viewing, or otherwise seeing the examples you acknowledge and agree Syncfusion’s examples will not allow you to seek injunctive relief in any form for any claim related to the sample. If you do not agree to this, do not view, access, utilize or otherwise do anything with Syncfusion’s examples.
+
+## <a name="about-syncfusion"></a>About Syncfusion ##
+Founded in 2001 and headquartered in Research Triangle Park, N.C., Syncfusion has more than 20,000 customers and more than 1 million users, including large financial institutions, Fortune 500 companies, and global IT consultancies.
+
+Today we provide 1,000+ controls and frameworks for web ([ASP.NET Core](https://www.syncfusion.com/aspnet-core-ui-controls), [ASP.NET MVC](https://www.syncfusion.com/aspnet-mvc-ui-controls), [ASP.NET WebForms](https://www.syncfusion.com/jquery/aspnet-web-forms-ui-controls), [JavaScript](https://www.syncfusion.com/javascript-ui-controls), [Angular](https://www.syncfusion.com/angular-ui-components), [React](https://www.syncfusion.com/react-ui-components), [Vue](https://www.syncfusion.com/vue-ui-components), and [Blazor](https://www.syncfusion.com/blazor-components), mobile ([Xamarin](https://www.syncfusion.com/xamarin-ui-controls), [Flutter](https://www.syncfusion.com/flutter-widgets), [UWP](https://www.syncfusion.com/uwp-ui-controls), and [JavaScript](https://www.syncfusion.com/javascript-ui-controls)), and desktop development ([WinForms](https://www.syncfusion.com/winforms-ui-controls), [WPF](https://www.syncfusion.com/products/wpf-ui-controls), and [UWP](https://www.syncfusion.com/uwp-ui-controls)). We provide ready-to deploy enterprise software for dashboards, reports, data integration, and big data processing. Many customers have saved millions in licensing fees by deploying our software.

ReadMe.txt

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+Flutter - Read me
+
+To run the Flutter examples, please follow the below steps.
+ 
+* Click 'Explore Demo Source' button in Syncfusion control panel under Flutter menu.
+* Navigate to the 'SampleBrowser' folder and open it using VS code or Android studio.
+* Now get the required packages referred in the 'pubspec.yaml' file to run the project.
+* Run the project by connecting an emulator or a physical device.
+ 
+Note - Android SDK 16 or later version is required to run the flutter examples.

analysis_options.yaml

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+# Specify analysis options.
+#
+# Until there are meta linter rules, each desired lint must be explicitly enabled.
+# See: https://github.com/dart-lang/linter/issues/288
+#
+# For a list of lints, see: http://dart-lang.github.io/linter/lints/
+# See the configuration guide for more
+# https://github.com/dart-lang/sdk/tree/master/pkg/analyzer#configuring-the-analyzer
+#
+# There are other similar analysis options files in the flutter repos,
+# which should be kept in sync with this file:
+#
+#   - analysis_options.yaml (this file)
+#   - packages/flutter/lib/analysis_options_user.yaml
+#   - https://github.com/flutter/plugins/blob/master/analysis_options.yaml
+#   - https://github.com/flutter/engine/blob/master/analysis_options.yaml
+#
+# This file contains the analysis options used by Flutter tools, such as IntelliJ,
+# Android Studio, and the `flutter analyze` command.
+
+analyzer:
+  strong-mode:
+    implicit-dynamic: false
+  errors:
+    # treat missing required parameters as a warning (not a hint)
+    missing_required_param: warning
+    # treat missing returns as a warning (not a hint)
+    missing_return: warning
+    # allow having TODOs in the code
+    todo: ignore
+  exclude:
+    - 'bin/cache/**'
+    # the following two are relative to the stocks example and the flutter package respectively
+    # see https://github.com/dart-lang/sdk/issues/28463
+    - 'lib/i18n/stock_messages_*.dart'
+    - 'lib/src/http/**'
+
+linter:
+  rules:
+    # these rules are documented on and in the same order as
+    # the Dart Lint rules page to make maintenance easier
+    # https://github.com/dart-lang/linter/blob/master/example/all.yaml
+    - always_declare_return_types
+    - always_put_control_body_on_new_line
+    # - always_put_required_named_parameters_first # we prefer having parameters in the same order as fields https://github.com/flutter/flutter/issues/10219
+    - always_require_non_null_named_parameters
+    - always_specify_types
+    # - avoid_annotating_with_dynamic # conflicts with always_specify_types
+    - avoid_as
+    # - avoid_bool_literals_in_conditional_expressions # not yet tested
+    # - avoid_catches_without_on_clauses # we do this commonly
+    # - avoid_catching_errors # we do this commonly
+    - avoid_classes_with_only_static_members
+    # - avoid_double_and_int_checks # only useful when targeting JS runtime
+    - avoid_empty_else
+    - avoid_field_initializers_in_const_classes
+    - avoid_function_literals_in_foreach_calls
+    # - avoid_implementing_value_types # not yet tested
+    - avoid_init_to_null
+    # - avoid_js_rounded_ints # only useful when targeting JS runtime
+    - avoid_null_checks_in_equality_operators
+    # - avoid_positional_boolean_parameters # not yet tested
+    # - avoid_private_typedef_functions # we prefer having typedef (discussion in https://github.com/flutter/flutter/pull/16356)
+    - avoid_relative_lib_imports
+    - avoid_renaming_method_parameters
+    - avoid_return_types_on_setters
+    # - avoid_returning_null # there are plenty of valid reasons to return null
+    - avoid_returning_null_for_void
+    # - avoid_returning_this # there are plenty of valid reasons to return this
+    # - avoid_setters_without_getters # not yet tested
+    # - avoid_single_cascade_in_expression_statements # not yet tested
+    - avoid_slow_async_io
+    - avoid_types_as_parameter_names
+    # - avoid_types_on_closure_parameters # conflicts with always_specify_types
+    - avoid_unused_constructor_parameters
+    - avoid_void_async
+    - await_only_futures
+    - camel_case_types
+    - cancel_subscriptions
+    # - cascade_invocations # not yet tested
+    # - close_sinks # not reliable enough
+    # - comment_references # blocked on https://github.com/flutter/flutter/issues/20765
+    # - constant_identifier_names # needs an opt-out https://github.com/dart-lang/linter/issues/204
+    - control_flow_in_finally
+    # - curly_braces_in_flow_control_structures # not yet tested
+    - directives_ordering
+    - empty_catches
+    - empty_constructor_bodies
+    - empty_statements
+    # - file_names # not yet tested
+    - flutter_style_todos
+    - hash_and_equals
+    - implementation_imports
+    # - invariant_booleans # too many false positives: https://github.com/dart-lang/linter/issues/811
+    - iterable_contains_unrelated_type
+    # - join_return_with_assignment # not yet tested
+    - library_names
+    - library_prefixes
+    # - lines_longer_than_80_chars # not yet tested
+    - list_remove_unrelated_type
+    # - literal_only_boolean_expressions # too many false positives: https://github.com/dart-lang/sdk/issues/34181
+    - no_adjacent_strings_in_list
+    - no_duplicate_case_values
+    - non_constant_identifier_names
+    # - null_closures  # not yet tested
+    # - omit_local_variable_types # opposite of always_specify_types
+    # - one_member_abstracts # too many false positives
+    # - only_throw_errors # https://github.com/flutter/flutter/issues/5792
+    - package_api_docs
+    - package_names
+    - package_prefixed_library_names
+    # - parameter_assignments # we do this commonly
+    - prefer_adjacent_string_concatenation
+    - prefer_asserts_in_initializer_lists
+    - prefer_collection_literals
+    - prefer_conditional_assignment
+    - prefer_const_constructors
+    - prefer_const_constructors_in_immutables
+    - prefer_const_declarations
+    - prefer_const_literals_to_create_immutables
+    # - prefer_constructors_over_static_methods # not yet tested
+    - prefer_contains
+    - prefer_equal_for_default_values
+    # - prefer_expression_function_bodies # conflicts with https://github.com/flutter/flutter/wiki/Style-guide-for-Flutter-repo#consider-using--for-short-functions-and-methods
+    - prefer_final_fields
+    - prefer_final_locals
+    - prefer_foreach
+    # - prefer_function_declarations_over_variables # not yet tested
+    - prefer_generic_function_type_aliases
+    - prefer_initializing_formals
+    # - prefer_int_literals # not yet tested
+    # - prefer_interpolation_to_compose_strings # not yet tested
+    - prefer_is_empty
+    - prefer_is_not_empty
+    - prefer_iterable_whereType
+    # - prefer_mixin # https://github.com/dart-lang/language/issues/32
+    - prefer_single_quotes
+    - prefer_typing_uninitialized_variables
+    - prefer_void_to_null
+    # - public_member_api_docs # enabled on a case-by-case basis; see e.g. packages/analysis_options.yaml
+    - recursive_getters
+    - slash_for_doc_comments
+    - sort_constructors_first
+    - sort_pub_dependencies
+    - sort_unnamed_constructors_first
+    - test_types_in_equals
+    - throw_in_finally
+    # - type_annotate_public_apis # subset of always_specify_types
+    - type_init_formals
+    # - unawaited_futures # too many false positives
+    - unnecessary_brace_in_string_interps
+    - unnecessary_const
+    - unnecessary_getters_setters
+    # - unnecessary_lambdas # has false positives: https://github.com/dart-lang/linter/issues/498
+    - unnecessary_new
+    - unnecessary_null_aware_assignments
+    - unnecessary_null_in_if_null_operators
+    - unnecessary_parenthesis
+    - unnecessary_statements
+    - unnecessary_this
+    - unrelated_type_equality_checks
+    - use_rethrow_when_possible
+    # - use_setters_to_change_properties # not yet tested
+    # - use_string_buffers # has false positives: https://github.com/dart-lang/sdk/issues/34182
+    # - use_to_and_as_if_applicable # has false positives, so we prefer to catch this by code-review
+    - valid_regexps
+    # - void_checks # not yet tested