ContrastValidator class
Validates color contrast ratios for accessibility compliance.
Implements WCAG 2.1 contrast ratio calculations and provides methods to check if color combinations meet accessibility standards.
Example:
final isAccessible = ContrastValidator.meetsWcagAA(
foreground: Colors.blue,
background: Colors.white,
);
Properties
- hashCode → int
-
The hash code for this object.
no setterinherited
- runtimeType → Type
-
A representation of the runtime type of the object.
no setterinherited
Methods
-
noSuchMethod(
Invocation invocation) → dynamic -
Invoked when a nonexistent method or property is accessed.
inherited
-
toString(
) → String -
A string representation of this object.
inherited
Operators
-
operator ==(
Object other) → bool -
The equality operator.
inherited
Static Methods
-
contrastRatio(
Color foreground, Color background) → double - Calculates the contrast ratio between two colors.
-
describeRatio(
double ratio) → String - Gets a readable description of a contrast ratio.
-
meetsLevel(
Color foreground, Color background, ContrastLevel level) → bool - Checks if a color combination meets a specific WCAG level.
-
meetsWcagAA(
Color foreground, Color background) → bool - Checks if a color combination meets WCAG AA for normal text.
-
meetsWcagAA3(
Color foreground, Color background) → bool - Checks if a color combination meets WCAG AA for large text/UI components.
-
meetsWcagAAA(
Color foreground, Color background) → bool - Checks if a color combination meets WCAG AAA for normal text.
-
suggestAccessibleColor(
Color foreground, Color background, {ContrastLevel level = ContrastLevel.aa}) → Color - Suggests an adjusted color that meets the target contrast level.
-
validatePalette(
List< Color> colors, Color background, {ContrastLevel level = ContrastLevel.aa}) → Map<int, ContrastIssue> - Validates a color palette against a background.