A set of useful sliver tools that are missing from the flutter framework

sliver_tools

A set of useful sliver tools that are missing from the flutter framework.

Here is a taste what you can make using this package

The structure of this app:

class Section extends State {
  @override
  Widget build(BuildContext context) {
    return MultiSliver(
      pushPinnedChildren: true,
      children: <Widget>[
        SliverPersistentHeader(
          pinned: true,
          ...
        ),
        if (!infinite)
          SliverAnimatedPaintExtent(
            child: SliverList(...),
          )
        else
          SliverList(...),
      ],
    );
  }
}

class NewsPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return CustomScrollView(
      slivers: <Widget>[
        Section(infinite: false),
        Section(infinite: true),
      ],
    );
  }
}

MultiSliver

The MultiSliver widget allows for grouping of multiple slivers together such that they can be returned as a single widget. For instance when one wants to wrap a few slivers with some padding or an inherited widget.

Example

class WidgetThatReturnsASliver extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MultiSliver(
      pushPinnedChildren: false, // defaults to false
      children: <Widget>[
        SliverPersistentHeader(...),
        SliverList(...),
      ],
    );
  }
}

The pushPinnedChildren parameter allows for achieving a ‘sticky header’ effect by simply using pinned SliverPersistentHeader widgets (or any custom sliver that paints beyond its layoutExtent).

SliverStack

The SliverStack widget allows for stacking of both slivers and box widgets. This can be useful for adding some decoration to a sliver. Which is what some of the other widgets in this package use to get their desired effects.

Example

class WidgetThatReturnsASliver extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return SliverStack(
      insetOnOverlap: false, // defaults to false
      children: <Widget>[
        SliverPositioned.fill(
          child: Container(
            decoration: BoxDecoration(
              color: Colors.white,
              boxShadow: const <BoxShadow>[
                BoxShadow(
                  offset: Offset(0, 4),
                  blurRadius: 8,
                  color: Colors.black26,
                )
              ],
              borderRadius: BorderRadius.circular(8),
            ),
          ),
        )
        SliverList(...),
      ],
    );
  }
}

The insetOnOverlap handles whether the positioned children should be inset (made smaller) when the sliver has overlap from a previous sliver.

SliverClip

The SliverClip widget will add a clip around its child from the child’s paintOrigin to its paintExtent. This is very useful and most likely what you want when using a pinned SliverPersistentHeader as child of the stack.

Example

class WidgetThatReturnsASliver extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return SliverClip(
      clipOverlap: true, // defaults to true
      child: SliverList(...),
    );
  }
}

The clipOverlap parameter allows for configuring whether any overlap with the previous child should be clipped. This can be useful when one has a SliverPersitentHeader above a SliverList and does not want to give the header an opaque background but also prevent the list from drawing underneath the header.

SliverAnimatedPaintExtent

The SliverAnimatedPaintExtent widget allows for having a smooth transition when a sliver changes the space it will occupy inside the viewport. For instance when using a SliverList with a button below it that loads the next few items.

Example

class WidgetThatReturnsASliver extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return SliverAnimatedPaintExtent(
      duration: const Duration(milliseconds: 150),
      child: SliverList(...),
    );
  }
}

SliverAnimatedSwitcher

The SliverAnimatedSwitcher widget is simply a pre-configured AnimatedSwitcher widget. If one needs more options than supplied by this widget a regular AnimatedSwitcher can be used by giving it the defaultLayoutBuilder and defaultTransitionBuilder of SliverAnimatedSwitcher.

SliverCrossAxisConstrained

The SliverCrossAxisConstrained widget allows for limiting the cross axis extent of a sliver to a maximum value given by the maxCrossAxisExtent. For instance a long list of text items on an iPad would be too wide to read so one can wrap the SliverList in a SliverCrossAxisConstrained and limit its width to something more reasonable.

Example

class WidgetThatReturnsASliver extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return SliverCrossAxisConstrained(
      maxCrossAxisExtent: 700,
      child: SliverList(...),
    );
  }
}

SliverCrossAxisPadded

The SliverCrossAxisPadded widget allows for adding padding to the cross axis of a sliver. This can be done either by passing a paddingStart and/or paddingEnd or by using the symmetric constructor which takes a single padding value. When using paddingStart and paddingEnd in a vertical sliver it will depend on the TextDirection whether start is left or right.

Example

class WidgetThatReturnsASliver extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return SliverCrossAxisPadded(
      paddingStart: 24,
      paddingEnd: 48,
      textDirection: TextDirection.ltr, // optional, defaults to the Directionality specified by the context
      child: SliverList(...),
    );
  }
}

SliverPinnedHeader

The SliverPinnedHeader widget allows for easily making a pinned header. It will size itself to the size of the child and when it reaches the leading edge of the viewport stay there instead of scrolling off the screen.

Download Details:

Author: Kavantix

Source Code: https://github.com/Kavantix/sliver_tools

#flutter #dart #mobile-apps

What is GEEK

Buddha Community

Google's Flutter 1.20 stable announced with new features - Navoki

Flutter Google cross-platform UI framework has released a new version 1.20 stable.

Flutter is Google’s UI framework to make apps for Android, iOS, Web, Windows, Mac, Linux, and Fuchsia OS. Since the last 2 years, the flutter Framework has already achieved popularity among mobile developers to develop Android and iOS apps. In the last few releases, Flutter also added the support of making web applications and desktop applications.

Last month they introduced the support of the Linux desktop app that can be distributed through Canonical Snap Store(Snapcraft), this enables the developers to publish there Linux desktop app for their users and publish on Snap Store.  If you want to learn how to Publish Flutter Desktop app in Snap Store that here is the tutorial.

Flutter 1.20 Framework is built on Google’s made Dart programming language that is a cross-platform language providing native performance, new UI widgets, and other more features for the developer usage.

Here are the few key points of this release:

Performance improvements for Flutter and Dart

In this release, they have got multiple performance improvements in the Dart language itself. A new improvement is to reduce the app size in the release versions of the app. Another performance improvement is to reduce junk in the display of app animation by using the warm-up phase.

If your app is junk information during the first run then the Skia Shading Language shader provides for pre-compilation as part of your app’s build. This can speed it up by more than 2x.

Added a better support of mouse cursors for web and desktop flutter app,. Now many widgets will show cursor on top of them or you can specify the type of supported cursor you want.

Autofill for mobile text fields

Autofill was already supported in native applications now its been added to the Flutter SDK. Now prefilled information stored by your OS can be used for autofill in the application. This feature will be available soon on the flutter web.

A new widget for interaction

InteractiveViewer is a new widget design for common interactions in your app like pan, zoom drag and drop for resizing the widget. Informations on this you can check more on this API documentation where you can try this widget on the DartPad. In this release, drag-drop has more features added like you can know precisely where the drop happened and get the position.

Updated Material Slider, RangeSlider, TimePicker, and DatePicker

In this new release, there are many pre-existing widgets that were updated to match the latest material guidelines, these updates include better interaction with Slider and RangeSlider, DatePicker with support for date range and time picker with the new style.

New pubspec.yaml format

Other than these widget updates there is some update within the project also like in pubspec.yaml file format. If you are a flutter plugin publisher then your old pubspec.yaml  is no longer supported to publish a plugin as the older format does not specify for which platform plugin you are making. All existing plugin will continue to work with flutter apps but you should make a plugin update as soon as possible.

Preview of embedded Dart DevTools in Visual Studio Code

Visual Studio code flutter extension got an update in this release. You get a preview of new features where you can analyze that Dev tools in your coding workspace. Enable this feature in your vs code by _dart.previewEmbeddedDevTools_setting. Dart DevTools menu you can choose your favorite page embed on your code workspace.

Network tracking

The updated the Dev tools comes with the network page that enables network profiling. You can track the timings and other information like status and content type of your** network calls** within your app. You can also monitor gRPC traffic.

Generate type-safe platform channels for platform interop

Pigeon is a command-line tool that will generate types of safe platform channels without adding additional dependencies. With this instead of manually matching method strings on platform channel and serializing arguments, you can invoke native class and pass nonprimitive data objects by directly calling the Dartmethod.

There is still a long list of updates in the new version of Flutter 1.2 that we cannot cover in this blog. You can get more details you can visit the official site to know more. Also, you can subscribe to the Navoki newsletter to get updates on these features and upcoming new updates and lessons. In upcoming new versions, we might see more new features and improvements.

You can get more free Flutter tutorials you can follow these courses:

• Setup Flutter Desktop on Windows, Linux, MacOS using VSCode and Build – Flutter Tutorial
• Flutter Desktop Linux app | Build and Publish on Snapcraft Store
• Firebase Local Emulator Suite in Flutter

#dart #developers #flutter #app developed #dart devtools in visual studio code #firebase local emulator suite in flutter #flutter autofill #flutter date picker #flutter desktop linux app build and publish on snapcraft store #flutter pigeon #flutter range slider #flutter slider #flutter time picker #flutter tutorial #flutter widget #google flutter #linux #navoki #pubspec format #setup flutter desktop on windows

What is Flutter and why you should learn it?

Flutter is an open-source UI toolkit for mobile developers, so they can use it to build native-looking** Android and iOS** applications from the same code base for both platforms. Flutter is also working to make Flutter apps for Web, PWA (progressive Web-App) and Desktop platform (Windows,macOS,Linux).

Flutter was officially released in December 2018. Since then, it has gone a much stronger flutter community.

There has been much increase in flutter developers, flutter packages, youtube tutorials, blogs, flutter examples apps, official and private events, and more. Flutter is now on top software repos based and trending on GitHub.

Flutter meaning?

What is Flutter? this question comes to many new developer’s mind.

Flutter means flying wings quickly, and lightly but obviously, this doesn’t apply in our SDK.

So Flutter was one of the companies that were acquired by **Google **for around $40 million. That company was based on providing gesture detection and recognition from a standard webcam. But later when the Flutter was going to release in alpha version for developer it’s name was Sky, but since Google already owned Flutter name, so they rename it to Flutter.

Where Flutter is used?

Flutter is used in many startup companies nowadays, and even some MNCs are also adopting Flutter as a mobile development framework. Many top famous companies are using their apps in Flutter. Some of them here are

Dream11

NuBank

Reflectly app

Abbey Road Studios

and many more other apps. Mobile development companies also adopted Flutter as a service for their clients. Even I was one of them who developed flutter apps as a freelancer and later as an IT company for mobile apps.

#dart #flutter #uncategorized #flutter framework #flutter jobs #flutter language #flutter meaning #flutter meaning in hindi #google flutter #how does flutter work #what is flutter

11 Best Flutter Development Tools You Will Need As A Beginner

In this tutorial, I am going to show you some of the Best Flutter development tools available in the market which will help you to make Development Productivity Faster and Build Better Applications. Flutter is a Framework from google for Creating Cross-platform mobile apps.

Flutter is a Google UI Framework for Developers to Create Native applications for Mobile, Web, and Desktop Just in a Single Codebase. Flutter is Used by Millions of Developer Worldwide to create beautiful UI for their applications.we’ll look at some of the Best flutter development tools that can greatly improve your workflow and help you reduce development time.

Okay Without wasting any time. Let’s start in and Discover lots of New & awesome Flutter tools to develop your flutter apps like a legend.

Best Flutter Development Tool

#11. panache
Panache will help you to create beautiful themes for your flutter apps, you can customize colors & shapes in the apps.

Website: https://rxlabz.github.io/panache

#10.Codemagic
Codemagic is another awesome tool that’ll boost your flutter app development process. Cinemagic will test and release your flutter apps without issue & with no configuration. with the help Codemagic, you can automate the whole build process, test and release process of your flutter apps

Website: codemagic.io

#9.Appetize
Appetize is an Online web-based android Emulator and iOS simulator. Appetize will run Native mobile Apps in the browser with HTML and Javascript. which is easy to maintain and tacks.

Website: appetize.io

#8.TestMagic
TestMagic is a Free Companion app just like Codmagic for Fast & Easy testing of your android and iOS builds. Testmagics helps to distribute your builds and Testing android and Ios Apps on real devices as well as provide Feedback to your projects.

Website: testmagic.io

#7. Screenshots
A screenshot is a command-line utility for capturing Screenshots into the status bar placed in the device frame. Screenshots can be integrated into flutter to work transparently into Android and iOS.

Website: https://github.com/mmcc007/screenshots

#6.Supernova
Supernova Recently Introduced Support For Flutter Platform in Flutter interact. Supernova is a tool that helps you to Generate UI Code for Flutter. it’s support for material Design widgets a style manage that can bring the concepts of token and style into a flutter, you can have flutter app running side by side with Supernova and Change happen real-time.

Supernova will save your time by importing your Sketch Or Adobe Xd file, Select flutter as your export platform which will convert UI design into Production-ready Code.

Website: supernova.io

#5. Adobe Plugins For Flutter
Adobe Recently Released Plugins for Adobe Xd in Flutter Interact, which will Generate Code for Creating apps with flutter which is based on UI design in Adobe XD. this is Collaboration Between Google and Adobe that will be Expected to Released Early 2020. So Plugins will be Open Source According to Adobe.

Website: theblog.adobe.com

Read more

#flutter development tools #flutter tools #best flutter development tools #best flutter tools #flutter

Adobe XD plugin for Flutter with CodePen Tutorial

Recently Adobe XD releases a new version of the plugin that you can use to export designs directly into flutter widgets or screens. Yes, you read it right, now you can make and export your favorite design in Adobe XD and export all the design in the widget form or as a full-screen design, this can save you a lot of time required in designing.

What we will do?
I will make a simple design of a dialogue box with a card design with text over it as shown below. After you complete this exercise you can experiment with the UI. You can make your own components or import UI kits available with the Adobe XD.

#developers #flutter #adobe xd design export to flutter #adobe xd flutter code #adobe xd flutter code generator - plugin #adobe xd flutter plugin #adobe xd flutter plugin tutorial #adobe xd plugins #adobe xd to flutter #adobe xd tutorial #codepen for flutter.

Top 12 Most Used Tools By Developers In 2020

rameworks and libraries can be said as the fundamental building blocks when developers build software or applications. These tools help in opting out the repetitive tasks as well as reduce the amount of code that the developers need to write for a particular software.

Recently, the Stack Overflow Developer Survey 2020 surveyed nearly 65,000 developers, where they voted their go-to tools and libraries. Here, we list down the top 12 frameworks and libraries from the survey that are most used by developers around the globe in 2020.

(The libraries are listed according to their number of Stars in GitHub)

1| TensorFlow

**GitHub Stars: **147k

Rank: 5

**About: **Originally developed by researchers of Google Brain team, TensorFlow is an end-to-end open-source platform for machine learning. It has a comprehensive, flexible ecosystem of tools, libraries, and community resources that lets researchers push the state-of-the-art research in ML. It allows developers to easily build and deploy ML-powered applications.

Know more here.

2| Flutter

**GitHub Stars: **98.3k

**Rank: **9

About: Created by Google, Flutter is a free and open-source software development kit (SDK) which enables fast user experiences for mobile, web and desktop from a single codebase. The SDK works with existing code and is used by developers and organisations around the world.

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#opinions #developer tools #frameworks #java tools #libraries #most used tools by developers #python tools