LinearProgressIndicator class

A progress bar widget that fills its horizontal area with block characters.

It supports custom styling, progress smoothing (using fractional block Unicode characters), gradient coloring (interpolating between start and end colors), and custom mathematical easing curves.

Example Usage

LinearProgressIndicator(
  0.75,
  smooth: true,
  startColor: Color(0xFF00FF00), // Green
  endColor: Color(0xFFFF0000),   // Red
  easing: Easing.easeInOutQuad,
);

Properties and Settings

Property	Type	Description
fraction	double	Progress percentage from 0.0 to 1.0.
style	Style	Rendering style (foreground/background color).
showPercentage	bool	Overlay the text representation (e.g. "75%").
smooth	bool	Draw fractional widths (1/8 to 7/8 characters).
startColor	Color?	Starting color for the horizontal gradient.
endColor	Color?	Ending color for the horizontal gradient.
easing	EasingFunction	Mathematical formula adjusting progress speed.

Inheritance

• Object
• Widget
• LinearProgressIndicator

Constructors

LinearProgressIndicator(double fraction, {Style style = Style.empty, bool showPercentage = true, bool smooth = false, Color? startColor, Color? endColor, EasingFunction easing = Easing.linear})

Creates a LinearProgressIndicator.

const

Properties

easing → EasingFunction

Mathematical formula adjusting progress speed.

final

endColor → Color?

Ending color for the horizontal gradient.

final

fraction → double

Progress percentage from 0.0 to 1.0.

final

hashCode → int

The hash code for this object.

no setter, inherited

key → Key?

The optional key for this widget.

final, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

showPercentage → bool

Overlay the text representation (e.g. "75%").

final

smooth → bool

Draw fractional widths (1/8 to 7/8 characters).

final

startColor → Color?

Starting color for the horizontal gradient.

final

style → Style

Rendering style (foreground/background color).

final

Methods

createElement() → Element

Creates an Element to manage this widget's location in the tree.

inherited

getIntrinsicHeight(int width) → int

Computes the intrinsic height of this widget under the given width constraint.

inherited

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

render(Buffer buffer, Rect area) → void

Renders the widget onto the provided buffer within the specified area.

override

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited

Constants

eighths → const List<String>

List of fractional block characters for smooth progress representation.