causality and flutter_causality

causality:

flutter_causality:

Motivation

I wanted to have a system in place that works like you would describe stuff happening in the real world as well. Cause and effect came to my mind.

causality contains the pure Dart package and flutter_causality contains the Flutter related extensions.

Supported Features

causality

• ✅ Emit causes
• ✅ Effects observe causes
• ✅ Effects can result in new causes to be emitted

flutter_causality

• ✅ Put a causality universe widget in the wigdet tree
• ✅ Put an effect widget in the widget tree to observe causes

Explanation

See some explanatory examples in the diagram below:

• Effect1 and Effect2 both observe Cause1
• Effect1 emits 3 causes as its result
• Effect2 does not emit any resulting causes
• Effect2 observes Cause4, which is a cause emitted from Effect1

stateDiagram-v2
direction LR

classDef cause fill:lightgreen,color:black
classDef effect fill:lightblue,color:black

Cause1 --> Effect1

Effect1 --> Cause2
Effect1 --> Cause3
Effect1 --> Cause4

Cause1 --> Effect2

Cause4 --> Effect2

Effect2 --> [*]

class Cause1 cause
class Cause2 cause
class Cause3 cause
class Cause4 cause
class Effect1 effect
class Effect2 effect

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Resources

• Medium article by Goddchen: Bring causality to Dart/Flutter