Flutter animation

The Flutter team recently dropped a great new transitions package, based on the new SharedAxis Example They are super cool to look at and appear to be highly performant. The only issue? The examples they’ve provided with the package are pretty hard to follow (coming in at close to 1500 lines!) and there’s no code snippets at all in the README. But fear not! This package is actually extremely simple to use once you clear away the noise, and can see how it works. First, lets recap. The package itself is composed of 4 “transition patterns”: • SharedAxis– A PageRoute that transitions on the X, Y or Z axis, where Z represents scale. Recommended for pages that are related to one another (login, onboarding etc) • FadeThrough – A PageRoute where outgoing elements fade out, then incoming elements fade in and scale up. Recommended for pages that have no strong relationship to eachother. • FadeScale– A Modal PageRoute (meant for dialogs). Elements that enter use a quick fade in and scale from 80% to 100%. Elements that exit simply fade out. • OpenContainer – A container that grows to fill the screen to reveal new content when tapped. Similar to a Hero widget. We’ll show you how to use the various page routes first, and then we’ll talk a bit more about using OpenContainer. They’re all just page transitions… Using SharedAxis, FadeThrough and FadeScale really could not be easier. They’re just Transitions you can use inside your PageRoutes, so you can just define some static builder meth...

Whenever building an app animation plays a vital role in designing the experience of the user. People tend to like an app that has a smooth flow and a slick design. The Flutter Package provides a variety of methods to create and use animation in our app. We will be discussing the inbuilt Flutter widgets to handle animation. Animation in Flutter As the flow chart shows to handle animation in Flutter the framework provides widgets of different capacity and implementation. The basic property that is present in all the animation widget is the Duration and Curve. The Duration is the time for which the widget animates and the Curve defines the way the object animates and from beginning to end (The flow of the animation from start to end). The built-in animation widgets in flutter can be divided into two main categories. Implicit Widgets These are the simplest widget provided by flutter. These widgets can be implemented without much work from the developer. These are very basic animation techniques, so they don’t have many options available to be changed. They have one-way animation which is not continuous. The implicit widgets can in turn be categorized into two as • AnimatedXYZ: Here XYZ is a specific widget available to be animated. These are animated versions of the basic widgets available in Flutter. Here are some of the Implicit AnimatedXYZ of existing XYZ widgets. • Align → AnimatedAlign • Container → AnimatedContainer • DefaultTextStyle → AnimatedDefaultTextStyle • ...

• • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • open_in_new • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • • Contents • • • • With Flutter’s implicit animations, or implicitly animated widgets, deriving their name from the ImplicitlyAnimatedWidget class that they implement. The following set of resources provide many ways to learn about implicit animations in Flutter. Documentation Jump right into the code! This codelab uses interactive examples and step-by-step instructions to teach you how to use implicit animations. AnimatedContainer sample A step-by-step recipe from the AnimatedContainer implicitly animated widget. ImplicitlyAnimatedWidget API page All implicit animations extend the ImplicitlyAnimatedWidget class. Flutter in Focus videos Flutter in Focus videos feature 5-10 minute tutorials with real code that cover techniques that every Flutter dev needs to know from top to bottom. The following videos cover topics that are relevant to implicit animations. The Boring Show Watch the Boring Show to follow Google Engineers build apps from scratch in Flutter. The following episode covers using implicit animations in a news aggregator app. Widget of the Week videos A weekly series of short animated videos each showing the important features of one particular wid...

I am trying to animate my widgets on provider updates without a success. import 'package:flutter/material.dart'; import 'package:flutter_animate/flutter_animate.dart'; import 'package:provider/provider.dart'; class DataProvider with ChangeNotifier If you execute the above code you will see that text will change every time you hit the floating action button but animations won't kick in. How can I make animations kick in? The most effective way to handle any kind of animation is to create a controller for that effect. Then we use that controller to make changes to the animation by playing with the controller rather than the animation widget itself. When FAB is clicked , we reset the animation by making the animation widget to go back to the initial state by using _controller.reverse() and then animate the widget with _controller.forward();. Complete Code : - import 'package:flutter/material.dart'; import 'package:flutter_animate/flutter_animate.dart'; import 'package:provider/provider.dart'; class DataProvider with ChangeNotifier Output : -

Contents • • • • • UI developers often need to show and hide elements on screen. However, quickly popping elements on and off the screen can feel jarring to end users. Instead, fade elements in and out with an opacity animation to create a smooth experience. The AnimatedOpacity widget makes it easy to perform opacity animations. This recipe uses the following steps: • Create a box to fade in and out. • Define a StatefulWidget. • Display a button that toggles the visibility. • Fade the box in and out. 1. Create a box to fade in and out First, create something to fade in and out. For this example, draw a green box on screen. Container( width: 200, height: 200, color: Colors.green, ) 2. Define a StatefulWidget Now that you have a green box to animate, you need a way to know whether the box should be visible. To accomplish this, use a StatefulWidget. A StatefulWidget is a class that creates a State object. The State object holds some data about the app and provides a way to update that data. When updating the data, you can also ask Flutter to rebuild the UI with those changes. In this case, you have one piece of data: a boolean representing whether the button is visible. To construct a StatefulWidget, create two classes: A StatefulWidget and a corresponding State class. Pro tip: The Flutter plugins for Android Studio and VSCode include the stful snippet to quickly generate this code. // The StatefulWidget's job is to take data and create a State class. // In this case, the wid...