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A material design circular progress indicator, which spins to indicate that the application is busy.
A widget that shows progress along a circle. There are two kinds of circular progress indicators:
Determinate. Determinate progress indicators have a specific value at each point in time, and the value should increase monotonically from 0.0 to 1.0, at which time the indicator is complete. To create a determinate progress indicator, use a non-null value between 0.0 and 1.0.
Indeterminate. Indeterminate progress indicators do not have a specific value at each point in time and instead indicate that progress is being made without indicating how much progress remains. To create an indeterminate progress indicator, use a null value.
The indicator arc is displayed with valueColor, an animated value. To specify a constant color use: AlwaysStoppedAnimation
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