flutter CircularProgressIndicator
The CircularProgressIndicator
widget in Flutter is used to display a circular progress indicator, typically to indicate that a task is in progress. It is commonly used in scenarios such as loading data from a network or performing a time-consuming operation.
To use the CircularProgressIndicator
widget in Flutter, you can simply create an instance of it and place it in your widget tree. Here's an example:
CircularProgressIndicator()
This will display a default circular progress indicator with the default size and colors. You can customize the appearance of the CircularProgressIndicator
by using its various properties. For example, you can change the size, color, and stroke width of the indicator. Here's an example that demonstrates some of the available properties:
CircularProgressIndicator(
backgroundColor: Colors.grey, // Sets the background color of the indicator
valueColor: AlwaysStoppedAnimation<Color>(Colors.blue), // Sets the color of the indicator
strokeWidth: 5.0, // Sets the width of the indicator's stroke
)
In this example, the backgroundColor
property is set to Colors.grey
, the valueColor
property is set to AlwaysStoppedAnimation<Color>(Colors.blue)
, and the strokeWidth
property is set to 5.0
.
You can also control the progress of the indicator by using the value
property. The value
property accepts a double value between 0.0 and 1.0, where 0.0 represents no progress and 1.0 represents complete progress. By updating the value
property over time, you can animate the progress indicator. Here's an example:
double progress = 0.5; // Initial progress value
CircularProgressIndicator(
value: progress, // Sets the progress value of the indicator
)
In this example, the value
property is set to progress
, which is initially set to 0.5
. As the progress
value changes, the indicator will animate accordingly.
That's a brief overview of the CircularProgressIndicator
widget in Flutter. I hope this helps!