Inspired by a dribbble by Virgil Pana.

A fluid design slider that works just like the Slider material widget.

Used to select from a range of values.

Just add the package to your dependencies in the pubspec.yaml file:

dependencies:
  flutter_fluid_slider: ^1.0.2

Place the FluidSlider in your widget tree.

FluidSlider(
  value: _value,
  onChanged: (double newValue) {
    setState(() {
      _value = newValue;
    });
  },
  min: 0.0,
  max: 100.0,
),

• value : [Required] The currently selected value for this slider. The slider's thumb is drawn at a position that corresponds to this value.

• min : The minimum value the user can select. Defaults to 0.0. Must be less than or equal to max.

• max : The maximum value the user can select. Defaults to 1.0. Must be less than or equal to min.

• start : The widget to be displayed as the min label. For eg: an Icon can be displayed. If not provided the min value is displayed as text.

• end : The widget to be displayed as the max label. For eg: an Icon can be displayed. If not provided the max value is displayed as text.

• onChanged : [Required] Called during a drag when the user is selecting a new value for the slider

  by dragging.

  • The slider passes the new value to the callback but does not actually change state until the parent widget rebuilds the slider with the new value.

  • If null, the slider will be displayed as disabled.

• onChangeStart : Called when the user starts selecting a new value for the slider. The value passed will be the last value that the slider had before the change began.

• onChangeEnd : Called when the user is done selecting a new value for the slider.

• labelsTextStyle : The styling of the min and max text that gets displayed on the slider. If not provided the ancestor Theme's accentTextTheme text style will be applied.

• valueTextStyle : The styling of the current value text that gets displayed on the slider. If not provided the ancestor Theme's textTheme.title text style with bold will be applied .

• sliderColor : The color of the slider. If not provided the ancestor Theme's primaryColor will be applied.

• thumbColor : The color of the thumb. If not provided the Colors.white will be applied.

• showDecimalValue : Whether to display the first decimal value of the slider value. Defaults to false.

• mapValueToString : called with value for the String to be rendered in the slider's thumb. E.g. display roman integers as follows:

  FluidSlider(
    value:_val,
    min:1.0,
    max:5.0,
    onChanged:(){},
    mapValueToString: (double value){
      List<String> romanNumerals=['I', 'II', 'III', 'IV', 'V'];
      return _romanNumerals[value.toInt() - 1];
    }
  )

  See example. If null the value is converted to String based on [showDecimalValue].

• Ramotion - implementation for ios and android
• Virgil Pana - creating the original concept