Animation

Ticker

All the animation is triggered by ticker. Flutter widget could get a ticker by mixin SingleTickerProviderStateMixin or TickerProviderStateMixin.

The animation will run in a duration. And the ticket will dirve the this duration.

Value

The animation has a start value and end value. AnimationController will product a value with current duration which drived by the ticker. By default, the start value is 0, and end is 1.0.

The value will be producted by Animation's value, developer could add listener by addListenerto monitor the value's change, meanwhile, also could monitor the animation's status.

Tween

Since the AnimationController only prodct a double interploate value, so we need other class to product a value could be apply to the widget.

Tween will product differet types' value, like int, color, decoration...The Tween product a interpolating value which could generate an animation by animate method.

Curve

Since the top class which mentioned just product a linear value, so we need Curve to create a Curve value.

Developer could use the CurvedAnimation to bind a AnimationController to generate animation which could listen value's change, or use CurveTween to bind a Tween to product a animatable value which will generate animation's by animation method.