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Added custom strength calculation option to FlutterPasswordStrength c… #10

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56663e2
Added custom strength calculation option to FlutterPasswordStrength c…
ahhmino Mar 22, 2021
36807eb
Update flutter_password_strength.dart
ahhmino Sep 6, 2021
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92 changes: 50 additions & 42 deletions example/lib/flutter_password_strength/flutter_password_strength.dart
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Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,9 @@ class FlutterPasswordStrength extends StatefulWidget {
//Strength bar animation duration
final Duration? duration;

//Optional parameter for custom/third party strength calculation algorithm
final double Function(String password)? strengthCalculator;

//Strength callback
final void Function(double strength)? strengthCallback;

Expand All @@ -38,7 +41,8 @@ class FlutterPasswordStrength extends StatefulWidget {
this.backgroundColor = Colors.grey,
this.radius = 0,
this.duration,
this.strengthCallback})
this.strengthCallback,
this.strengthCalculator})
: super(key: key);

/*
Expand All @@ -52,30 +56,30 @@ class FlutterPasswordStrength extends StatefulWidget {
Animatable<Color?> get _strengthColors => (strengthColors != null
? strengthColors
: TweenSequence<Color?>(
[
TweenSequenceItem(
weight: 1.0,
tween: ColorTween(
begin: Colors.red,
end: Colors.yellow,
),
),
TweenSequenceItem(
weight: 1.0,
tween: ColorTween(
begin: Colors.yellow,
end: Colors.blue,
),
),
TweenSequenceItem(
weight: 1.0,
tween: ColorTween(
begin: Colors.blue,
end: Colors.green,
),
),
],
)) as Animatable<Color?>;
[
TweenSequenceItem(
weight: 1.0,
tween: ColorTween(
begin: Colors.red,
end: Colors.yellow,
),
),
TweenSequenceItem(
weight: 1.0,
tween: ColorTween(
begin: Colors.yellow,
end: Colors.blue,
),
),
TweenSequenceItem(
weight: 1.0,
tween: ColorTween(
begin: Colors.blue,
end: Colors.green,
),
),
],
)) as Animatable<Color?>;

//default duration is 300 milliseconds
Duration? get _duration =>
Expand Down Expand Up @@ -115,6 +119,9 @@ class _FlutterPasswordStrengthState extends State<FlutterPasswordStrength>
//Strength callback
void Function(double strength)? _strengthCallback;

//Optional parameter for custom/third party strength calculation algorithm
double Function(String password)? _strengthCalculator;

//_begin is used in _strengthBarAnimation
double _begin = 0;

Expand Down Expand Up @@ -143,14 +150,15 @@ class _FlutterPasswordStrengthState extends State<FlutterPasswordStrength>
_height = widget.height;
_radius = widget.radius;
_strengthCallback = widget.strengthCallback;
_strengthCalculator = widget.strengthCalculator == null ? estimateBruteforceStrength : widget.strengthCalculator;

//start animation
_animationController.forward();
}

void animate() {
//calculate strength
_passwordStrength = estimateBruteforceStrength(widget.password ?? "");
_passwordStrength = _strengthCalculator!(widget.password ?? "");

_begin = _end;
_end = _passwordStrength * 100;
Expand Down Expand Up @@ -203,12 +211,12 @@ class StrengthBarContainer extends AnimatedWidget {

const StrengthBarContainer(
{Key? key,
required this.barColor,
required this.backgroundColor,
this.width,
required this.height,
required this.radius,
required Animation animation})
required this.barColor,
required this.backgroundColor,
this.width,
required this.height,
required this.radius,
required Animation animation})
: super(key: key, listenable: animation);

Animation<double> get _percent {
Expand All @@ -219,16 +227,16 @@ class StrengthBarContainer extends AnimatedWidget {
Widget build(BuildContext context) {
return LayoutBuilder(
builder: (BuildContext context, BoxConstraints constraints) {
return Container(
child: CustomPaint(
size: Size(width ?? constraints.maxWidth, height),
painter: StrengthBarBackground(
backgroundColor: backgroundColor, backgroundRadius: radius),
foregroundPainter: StrengthBar(
barColor: barColor,
barRadius: radius,
percent: _percent.value)));
});
return Container(
child: CustomPaint(
size: Size(width ?? constraints.maxWidth, height),
painter: StrengthBarBackground(
backgroundColor: backgroundColor, backgroundRadius: radius),
foregroundPainter: StrengthBar(
barColor: barColor,
barRadius: radius,
percent: _percent.value)));
});
}
}

Expand Down
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