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ezanimation

ezanimation #
Easy Animations - No Controllers, No Tickers, Only the necessary parts.
Easily add Curves and ReverseCurves
Introduction #
Normal animations involve a fair amount of complexity: AnimationControllers, Tweens, Animation, Tickers are not familiar concepts to many.
Not just to beginners - when creating an explicit animation, even advanced users experience hardships dealing with the many components involved.
Announcing EzAnimation: A set of tools to make animations easier #
With EzAnimation, there is no need to burden your code with TickerProviders, the complicated logic of curves, different components of animation, etc.
Here is a simple example to create an animation with an expanding box:

First, we define a Container with a starting size of 50.0
return Scaffold(
body: Center(
child: Container(
color: Colors.yellow,
height: 50.0,
width: 50.0,
),
),
);
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Next, we define an animation to increase size
EzAnimation ezAnimation = EzAnimation(50.0, 200.0, Duration(seconds: 2));
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Then, we simply plugin in values and start the animation when we need to - in this case we will do it when the box is tapped
return Scaffold(
body: Center(
child: InkWell(
onTap: () {
ezAnimation.start();
},
child: AnimatedBuilder(
animation: ezAnimation,
builder: (context, snapshot) {
return Container(
color: Colors.yellow,
height: ezAnimation.value,
width: ezAnimation.value,
);
}
),
),
),
);
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And that's it!

TO USE: #
DEFINE EzAnimation #
(RECOMMENDED METHOD 1) Passing context:
EzAnimation animation = EzAnimation(10.0, 100.0, Duration(seconds: 1), context: context);

// This animation needs to be manually restarted when another page is pushed and then Navigator comes back
// The onNavigate param helps define the behaviour when another page is pushed
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(RECOMMENDED METHOD 2) Passing vsync:
EzAnimation animation = EzAnimation(10.0, 100.0, Duration(seconds: 1), context: context);

// Here the state class needs to add SingleTickerProviderMixin or TickerProviderMixin
// onNavigate does not work in this case as the page ticker defines the state of the animation
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A SIMPLE METHOD (LESS PERFORMANT): No context or vsync
EzAnimation animation = EzAnimation(10.0, 100.0, Duration(seconds: 1));

// Note that this animation needs to be manually stopped if you intend to push another page as it will go to completion without it.
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(Notice that you can define this outside of initState, unlike normal animation controllers)
START ANIMATION #
animation.start();

// OR

animation.start(from: 0.2);
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END ANIMATION #
animation.stop();
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REPEAT ANIMATION #
animation.repeat();
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RESET ANIMATION #
animation.reset();
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REVERSE ANIMATION #
animation.reverse();

// OR

animation.reverse(from: 0.5);
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DEFINE WHAT HAPPENS WHEN NAVIGATOR PUSHES ANOTHER PAGE ON TOP #
EzAnimation animation = EzAnimation(10.0, 100.0, Duration(seconds: 1), context: context, onNavigate: OnNavigate.pauseAnimation);
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An animation can either reset or pause when the navigator pushes another page on top. Use the onNavigate page to achieve this.
NOTE: A PAUSED ANIMATION NEEDS TO BE MANUALLY RESTARTED AFTER COMING BACK TO THE MAIN PAGE
onPressed: () async {
await Navigator.of(context).push(MaterialPageRoute(builder: (context) => DemoPage()));
animation.start();
}

resetAnimation -> Resets animation to the start
pauseAnimation -> Pauses animation at that instant (You need to manually restart this when it comes back)
letItRun -> Animation will go to completion unless animation.stop() is called.
takeToEnd -> Takes animation to final value instantly
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REBUILD UI #
You can use normal listeners and rebuild UI with AnimatedBuilder as usual.
animation.addListener(() {
setState(() {});
});

//OR

AnimatedBuilder(
animation: animation,
builder: (context, snapshot) {
return Center(
child: Container(
width: animation.value,
height: animation.value,
color: Colors.blue,
),
);
}
),
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ADD CURVES EASILY #
var animation = EzAnimation(10.0, 100.0, Duration(seconds: 1), curve: Curves.bounceInOut, reverseCurve: Curves.linear);
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LISTEN TO STATUS #
animation.addStatusListener((status) {
if (status == AnimationStatus.completed) {
animation.reverse();
}
});
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USE ANIMATION SEQUENCES #
You can have multiple animations running in series with weights with EzAnimation.sequence()
EzAnimation ezAnimation = EzAnimation.sequence([
SequenceItem(0.0, 100.0, weight: 2),
SequenceItem(100.0, 50.0),
SequenceItem(50.0, 100.0),
], Duration(seconds: 2), context: context);

ezAnimation.start();
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USE SPECIALIZED TWEENS #
Use the EzAnimation.tween() to pass in other Tween types such as ColorTween
EzAnimation ezAnimation = EzAnimation.tween(ColorTween(begin: Colors.red, end: Colors.blue), Duration(seconds: 2), context: context);

ezAnimation.start();
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Similarly, the EzAnimation.tweenSequence allows you to create a sequence with ColorTweens and other tweens
EzAnimation ezAnimation = EzAnimation.tweenSequence(TweenSequence([
TweenSequenceItem(tween: ColorTween(begin: Colors.red, end: Colors.blue), weight: 1.0),
TweenSequenceItem(tween: ColorTween(begin: Colors.red, end: Colors.blue), weight: 2.0),
]), Duration(seconds: 2), context: context);
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