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Dhrumil Shah, Shipmnts & GDG Ahmedabad @dhuma1981 Kolkata Flutter: Theming & Animation

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Dhrumil Shah Mobile Developer, @Shipmnts Co-organizer, @GDGAhmedabad Founder, @Flutter_Flakes

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“Everything is Widget”

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Theme is also a widget

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Theme Widget Kolkata ● @required data = ThemeData ● @require child = Widget ● Theme.of(context) ● Theme.of(context).copyWith

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ThemeData Kolkata ● primarySwatch ● primaryColor ● accentColor ● bottomAppBarColor ● dividerColor ● buttonTheme ● textTheme ● iconTheme ● tabBarTheme ● ...

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Theme Demo App

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Let’s edit Theme ● Make everything with RED

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Let’s edit FAB Theme ● Using Theme Widget ● Using Theme.of(context).copyWith()

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Let’s edit Body Theme ● Using Theme Widget ● Using Theme.of(context).copyWith()

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Let’s understand Animation

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Feedback Status User education

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Types of Animation Kolkata Tween-Based Animations Physics-Base d Animations models path between points A & B by a transform T based on range & timing models real-world behaviors like velocity, mass, friction, momentum etc.

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Tween-Based Animations / Default Type Kolkata Duration of Animation Value of Animation Upper Bound Value Lower Bound Value Linear Animation Completed Forward

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Tween-Based Animations / Curve Type Kolkata Duration of Animation Value of Animation Upper Bound Value Lower Bound Value non-Linear Animation Dismissed Completed

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Different Curve Types Kolkata

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How animation works?

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Build Layout Paint Animate Tick animations to change widget state Rebuild widgets to account for state changes Update size and position of render objects Vsync GPU Record display lists for composited layers Layer Tree

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Key Animation classes

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AnimationController Kolkata ● An animation itself ● Play-Stop-Reverse-Repeat-Reset-Resume ● AnimateTo-AnimateWith-Fling ● Duration and Value

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Animation Kolkata ● Animation Status ● Animation Value ● AddListener ● AddStatusListener ● AnimateTo-AnimateWith-Fling ● Duration and Value

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ImplicitlyAnimatedWidget Kolkata ● No Animation object needed ● Automatically interpolate and animate ● You can change the Curve and Duration ● AnimatedAlign ● AnimatedContainer ● AnimatedDefaultTextStyle ● AnimatedOpacity ● AnimatedPadding ● AnimatedPhysicalModel ● AnimatedPositioned ● AnimatedPositionedDirectional ● AnimatedTheme

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Some Examples Kolkata

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And some more Kolkata

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And That’s it

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References Kolkata ● Flutter.ioc - Theme & Animation ● Getting Animated from with Fluttter - @nitya ● Animating Flutter - @raoufrahiche ● Flutter Animation: motion awakens - @jansariparth

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Dhrumil Shah, Shipmnts & GDG Ahmedabad @dhuma1981 Kolkata Thank you!