Created
June 15, 2021 09:14
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Reveal Animation that is played when dragging exceeds our defined threshold.
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//Update scene state to "reveal" and start corresponding animation | |
//This method is called when drag excced our defined threshold | |
void _playRevealAnimation() { | |
setState(() { | |
currentScreenState = CURRENT_SCREEN_STATE.REVEALING_ANIMATING_STATE; | |
_revealAnimationController.forward(); | |
_amoebaAnimationController.forward(); | |
}); | |
} | |
//Animation controller for expanding the curve animation | |
_revealAnimationController = | |
AnimationController(duration: Duration(milliseconds: 500), vsync: this) | |
..addStatusListener((status) { | |
if (status == AnimationStatus.completed) | |
setState(() { | |
currentScreenState = CURRENT_SCREEN_STATE.POST_REVEAL_STATE; | |
_postRevealAnimationController.forward(); | |
}); | |
}); | |
//Animation to translate the brand label | |
_titleBaseLinePosTranslateAnim = RelativeRectTween( | |
begin: RelativeRect.fromLTRB( | |
0, | |
widget.height - | |
_initialCurveHeight - | |
widget.height * .2 - | |
arcHeight, | |
0, | |
_initialCurveHeight), | |
end: RelativeRect.fromLTRB( | |
0, | |
widget.height - _finalCurveHeight - 20 - arcHeight, | |
0, | |
_finalCurveHeight)) | |
.animate(CurvedAnimation( | |
parent: _revealAnimationController, curve: Curves.easeOutBack)); | |
//Animation to translate side icons | |
_sideIconsTranslateAnim = RelativeRectTween( | |
begin: RelativeRect.fromLTRB( | |
0, | |
widget.height - | |
_initialCurveHeight - | |
widget.height * .25 - | |
arcHeight, | |
0, | |
_initialCurveHeight), | |
end: RelativeRect.fromLTRB( | |
0, | |
widget.height - | |
_finalCurveHeight - | |
widget.height * .25 - | |
arcHeight, | |
0, | |
_finalCurveHeight)) | |
.animate(CurvedAnimation( | |
parent: _revealAnimationController, curve: Curves.easeInOutBack)); | |
//Tween for animating height of the curve during reveal process | |
_swipeArcAnimation = | |
Tween<double>(begin: _initialCurveHeight, end: _finalCurveHeight) | |
.animate(CurvedAnimation( | |
parent: _revealAnimationController, curve: Curves.easeInCubic)); | |
//Animation for the mid control point of cubic bezier curve to show acceleration effect in response to user drag. | |
_swipeArchHeightAnimation = TweenSequence<double>( | |
<TweenSequenceItem<double>>[ | |
TweenSequenceItem<double>( | |
tween: Tween<double>(begin: 0, end: 200), | |
weight: 50.0, | |
), | |
TweenSequenceItem<double>( | |
tween: Tween<double>(begin: 200, end: 0), | |
weight: 50.0, | |
), | |
], | |
).animate(CurvedAnimation( | |
parent: _revealAnimationController, curve: Curves.easeInCubic)); | |
//Animation Controller for amoeba background | |
_amoebaAnimationController = | |
AnimationController(duration: Duration(milliseconds: 350), vsync: this); | |
_amoebaOffsetAnimation = | |
Tween<Offset>(begin: Offset(0, 0), end: Offset(-20, -70)).animate( | |
CurvedAnimation( | |
parent: _amoebaAnimationController, | |
curve: Curves.easeInOutBack)); |
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