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Description:

flutter animated progress bar

Animated Progress Bar

An animated progress bar widget designed to be used with video or audio.

Features #
✅ Full control of the animations.
✅ Highly customizable.
✅ Nothing is clipped on the edges to give a modern aspect (See audio example below).
✅ Thumb related components are painted above all widgets to achieve fancy effects (See video example below).
Demo with video and audio:

Keep in mind this widget does not play any media by itself!
Quick Example #
class Example extends StatefulWidget {
const Example({super.key});

@override
State<Example> createState() => _ExampleState();
}

class _ExampleState extends State<Example> with TickerProviderStateMixin {
late final ProgressBarController _controller;

@override
void initState() {
super.initState();
_controller = ProgressBarController(vsync: this);
}

@override
void dispose() {
_controller.dispose();
super.dispose();
}

@override
Widget build(BuildContext context) {
return ProgressBar(
controller: _controller,
progress: const Duration(seconds: 30),
buffered: const Duration(seconds: 35),
total: const Duration(minutes: 1),
onSeek: (position) {
print('New position: $position');
},
);
}
}
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Usage #
First, you need a ProgressBarController to run the animations. Similar to AnimationController, you have to pass a TickerProvider which is configured using the vsync argument on the constructor.
To do so, you can add a TickerProviderStateMixin to your State.
class _ExampleState extends State<Example> with TickerProviderStateMixin {...}
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Then, add to ProgressBarController:
_controller = ProgressBarController(vsync: this);
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After that, add the media progress and total durations. You can also add the buffered position of the media.
ProgressBar(
controller: _controller,
progress: const Duration(seconds: 30),
buffered: const Duration(seconds: 35),
total: const Duration(minutes: 1),
onSeek: (position) {
print('New position: $position');
},
);
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Don't forget to dispose the controller when no longer needed.
ProgressBarController #
You can customize the duration of animations as below:
_controller = ProgressBarController(
vsync: this,
barAnimationDuration: const Duration(milliseconds: 300),
thumbAnimationDuration: const Duration(milliseconds: 200),
waitingDuration: const Duration(seconds: 3),
);
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If you want to go further, the controller gives you full control of the animations:
_controller.forward(); // Expand bar, wait and then collapse.

_controller.expandBar(); // Expand the bar.
_controller.collapseBar(); // Collapse the bar.
_controller.stopBarAnimation(); // Stop bar animation, if running.

_controller.expandThumb(); // Expand the thumb.
_controller.collapseThumb(); // Collapse the thumb.
_controller.stopThumbAnimation(); // Stop thumb animation, if running.

_controller.expandBar( // Expand bar with custom
duration: const Duration(seconds:1), // duration and curve.
curve: Curves.easeIn,
);
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The methods that start animations return a TickerFuture object which completes when the animation completes successfully. Which means that you can await for them to finish.
Customization #
You can customize the ProgressBar with the following parameters:

Parameter
Type
Description

alignment
ProgressBarAlignment
The alignment of ProgressBar relative to it's total size.

barCapShape
BarCapShape
The shape of the bars at the left and right edges.

progressBarIndicator
ProgressBarIndicator
The indicator to be painted.

collapsedBarHeight
double
The smallest size of this bar.

collapsedThumbRadius
double
The smallest size of this thumb.

expandedBarHeight
double
The greatest size of this bar.

expandedThumbRadius
double
The greatest size of this thumb.

thumbGlowRadius
double
The overlay drawn around the thumb.

thumbElevation
double
The size of the shadow around the thumb.

thumbGlowColor
Color
The color of the overlay drawn around the thumb.

backgroundBarColor
Color
The color of the bar in background.

collapsedProgressBarColor
Color
The color of the collapsed progress bar.

collapsedBufferedBarColor
Color
The color of the collapsed buffered bar.

collapsedThumbColor
Color
The color of the collapsed thumb.

expandedProgressBarColor
Color?
The color of the expanded progress bar.

expandedBufferedBarColor
Color?
The color of the expanded buffered bar.

expandedThumbColor
Color?
The color of the expanded thumb.

lerpColorsTransition
bool
Whether colors should be linearly interpolated when transitioning from collapsed to expanded state and vice versa.

showBufferedWhenCollapsed
bool
Whether the buffered bar should be shown when collapsed.

To quickly try it out all these features, check the Playground:

Notes #
If you find any bugs, don't hesitate to open an issue!