ProgressIndicatorTheme
    Customizes the appearance of progress indicators 
(ProgressBar, ProgressRing) across the 
app.
border_radius: BorderRadiusValue | None = None
Overrides the default value for 
ProgressBar.border_radius.
circular_track_color: ColorValue | None = None
Overrides the default value for ProgressRing.bgcolor.
circular_track_padding: PaddingValue | None = None
Overrides the default value for 
ProgressRing.padding.
color: ColorValue | None = None
Overrides the default values for ProgressBar.color and 
ProgressRing.color.
linear_min_height: Number | None = None
Overrides the default value for 
ProgressBar.bar_height.
linear_track_color: ColorValue | None = None
Overrides the default value for ProgressBar.bgcolor.
refresh_bgcolor: ColorValue | None = None
Background color of that fills the circle under the RefreshIndicator (TBD).
size_constraints: BoxConstraints | None = None
Overrides the default value for 
ProgressRing.size_constraints.
stop_indicator_color: ColorValue | None = None
Overrides the default value for 
ProgressBar.stop_indicator_color.
stop_indicator_radius: Number | None = None
Overrides the default value for 
ProgressBar.stop_indicator_radius.
stroke_align: Number | None = None
Overrides the default value for 
ProgressRing.stroke_align.
stroke_cap: StrokeCap | None = None
Overrides the default value for 
ProgressRing.stroke_cap.
stroke_width: Number | None = None
Overrides the default value for 
ProgressRing.stroke_width.
track_gap: Number | None = None
Overrides the default values for 
ProgressBar.track_gap and 
ProgressRing.track_gap.
year_2023: bool = False
Overrides the default values for 
ProgressBar.year_2023 and 
ProgressRing.year_2023.