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feat: adding background circles animation (#21)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,47 +1,190 @@ | ||
| import 'package:app_ui/app_ui.dart'; | ||
| import 'package:dash_ai_search/home/home.dart'; | ||
| import 'package:flutter/material.dart'; | ||
| import 'package:flutter_bloc/flutter_bloc.dart'; | ||
| import 'package:phased/phased.dart'; | ||
|
|
||
| class Background extends StatelessWidget { | ||
| const Background({super.key}); | ||
| class Background extends StatefulWidget { | ||
| const Background({ | ||
| super.key, | ||
| this.backgroundState, | ||
| }); | ||
|
|
||
| final PhasedState<BackgroundPhase>? backgroundState; | ||
|
|
||
| @override | ||
| State<Background> createState() => _BackgroundState(); | ||
| } | ||
|
|
||
| class _BackgroundState extends State<Background> { | ||
| late final _circlesState = widget.backgroundState ?? | ||
| PhasedState<BackgroundPhase>( | ||
| values: BackgroundPhase.values, | ||
| initialValue: BackgroundPhase.initial, | ||
| autostart: false, | ||
| ); | ||
|
|
||
| @override | ||
| void initState() { | ||
| super.initState(); | ||
|
|
||
| WidgetsBinding.instance.addPostFrameCallback((_) { | ||
| _circlesState.value = BackgroundPhase.circlesIn; | ||
| }); | ||
| } | ||
|
|
||
| @override | ||
| Widget build(BuildContext context) { | ||
| const leftOffset = -50.0; | ||
| const baseRadius = 303.0; | ||
| const baseMediumRadius = 255.0; | ||
| const baseSmallRadius = 185.0; | ||
| const horizontalOffset = baseRadius * 2; | ||
|
|
||
| return const SingleChildScrollView( | ||
| scrollDirection: Axis.horizontal, | ||
| child: Row( | ||
| children: [ | ||
| Circle( | ||
| offset: Offset(leftOffset, 0), | ||
| ), | ||
| Circle( | ||
| offset: Offset(horizontalOffset + leftOffset, 0), | ||
| child: Circle( | ||
| offset: Offset(horizontalOffset + leftOffset, 0), | ||
| radius: baseMediumRadius, | ||
| borderColor: VertexColors.lilac, | ||
| child: Circle( | ||
| offset: Offset(horizontalOffset + leftOffset, 0), | ||
| radius: baseSmallRadius, | ||
| borderColor: VertexColors.lilac, | ||
| dotted: true, | ||
| ), | ||
| return BlocListener<HomeBloc, HomeState>( | ||
| listener: (BuildContext context, state) { | ||
| if (state.status == Status.welcomeToAskQuestion) { | ||
| _circlesState.value = BackgroundPhase.circlesOut; | ||
| } | ||
| }, | ||
| child: LayoutBuilder( | ||
| builder: (context, constraints) { | ||
| final baseRadius = constraints.maxWidth / 7; | ||
| final offset = (baseRadius * 8) - constraints.maxWidth; | ||
| final baseMediumRadius = baseRadius * .84; | ||
| final baseSmallRadius = baseRadius * .61; | ||
|
|
||
| return _Circles( | ||
| state: _circlesState, | ||
| baseRadius: baseRadius, | ||
| offset: offset, | ||
| baseMediumRadius: baseMediumRadius, | ||
| baseSmallRadius: baseSmallRadius, | ||
| baseContainerHeight: constraints.maxHeight, | ||
| ); | ||
| }, | ||
| ), | ||
| ); | ||
| } | ||
| } | ||
|
|
||
| @visibleForTesting | ||
| enum BackgroundPhase { | ||
| initial, | ||
| circlesIn, | ||
| circlesOut, | ||
| } | ||
|
|
||
| class _Circles extends Phased<BackgroundPhase> { | ||
| const _Circles({ | ||
| required super.state, | ||
| required this.baseRadius, | ||
| required this.offset, | ||
| required this.baseMediumRadius, | ||
| required this.baseSmallRadius, | ||
| required this.baseContainerHeight, | ||
| }); | ||
|
|
||
| final double baseRadius; | ||
| final double offset; | ||
| final double baseMediumRadius; | ||
| final double baseSmallRadius; | ||
| final double baseContainerHeight; | ||
|
|
||
| @override | ||
| Widget build(BuildContext context) { | ||
| final size = baseRadius * 2; | ||
| const duration = Duration(seconds: 1); | ||
| const scaleDuration = Duration(milliseconds: 500); | ||
| const curve = Curves.decelerate; | ||
| return Stack( | ||
| children: [ | ||
| AnimatedPositioned( | ||
| curve: curve, | ||
| left: state.phaseValue( | ||
| values: { | ||
| BackgroundPhase.circlesOut: -offset * 2, | ||
| }, | ||
| defaultValue: -offset, | ||
| ), | ||
| duration: duration, | ||
| top: state.phaseValue( | ||
| values: { | ||
| BackgroundPhase.initial: baseContainerHeight, | ||
| }, | ||
| defaultValue: baseContainerHeight / 2 - baseRadius, | ||
| ), | ||
| child: Circle(radius: baseRadius), | ||
| ), | ||
| AnimatedPositioned( | ||
| curve: curve, | ||
| duration: duration, | ||
| left: state.phaseValue( | ||
| values: { | ||
| BackgroundPhase.circlesOut: -(size * 2 - offset), | ||
| }, | ||
| defaultValue: size - offset, | ||
| ), | ||
| top: state.phaseValue( | ||
| values: { | ||
| BackgroundPhase.initial: -size, | ||
| }, | ||
| defaultValue: baseContainerHeight / 2 - baseRadius, | ||
| ), | ||
| child: SizedBox.square( | ||
| dimension: baseRadius * 2, | ||
| child: Stack( | ||
| alignment: Alignment.center, | ||
| children: [ | ||
| Circle( | ||
| radius: baseRadius, | ||
| ), | ||
| Circle( | ||
| radius: baseMediumRadius, | ||
| borderColor: VertexColors.lilac, | ||
| ), | ||
| Circle( | ||
| radius: baseSmallRadius, | ||
| borderColor: VertexColors.lilac, | ||
| dotted: true, | ||
| ), | ||
| ], | ||
| ), | ||
| ), | ||
| Circle( | ||
| offset: Offset(horizontalOffset * 2 + leftOffset, 0), | ||
| ), | ||
| AnimatedPositioned( | ||
| curve: curve, | ||
| duration: duration, | ||
| left: size * 2 - offset, | ||
| top: state.phaseValue( | ||
| values: { | ||
| BackgroundPhase.initial: baseContainerHeight, | ||
| }, | ||
| defaultValue: baseContainerHeight / 2 - baseRadius, | ||
| ), | ||
| Circle( | ||
| offset: Offset(horizontalOffset * 3 + leftOffset, 0), | ||
| child: AnimatedScale( | ||
| duration: scaleDuration, | ||
| scale: state.phaseValue( | ||
| values: { | ||
| BackgroundPhase.circlesOut: 4, | ||
| }, | ||
| defaultValue: 1, | ||
| ), | ||
| child: Circle(radius: baseRadius), | ||
| ), | ||
| ], | ||
| ), | ||
| ), | ||
| AnimatedPositioned( | ||
| curve: curve, | ||
| duration: duration, | ||
| left: state.phaseValue( | ||
| values: { | ||
| BackgroundPhase.circlesOut: size * 4, | ||
| }, | ||
| defaultValue: size * 3 - offset, | ||
| ), | ||
| top: state.phaseValue( | ||
| values: { | ||
| BackgroundPhase.initial: -size, | ||
| }, | ||
| defaultValue: baseContainerHeight / 2 - baseRadius, | ||
| ), | ||
| child: Circle(radius: baseRadius), | ||
| ), | ||
| ], | ||
| ); | ||
| } | ||
| } |
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