AppFontSizes class

A flexible font sizing system with hierarchical typography scales.

This class provides a complete typographic scale based on a customizable base size (bodySmall) and a geometric scale factor. It follows a consistent progression from small body text to large display headings.

Typography Hierarchy (from smallest to largest):

  1. bodySmall - Smallest readable text (captions, footnotes)
  2. body - Standard body text (paragraphs, lists)
  3. bodyLarge - Emphasized body text
  4. paragraphTitle - Small headings within paragraphs
  5. subheader - Section subheadings
  6. header - Main section headings
  7. h3 - Third-level headings
  8. h2 - Second-level headings
  9. h1 - Top-level headings
  10. display - Hero text, large titles

Usage:

// Create a custom font size scale
final customSizes = AppFontSizes(
  bodySmall: 16,
  scaleFactor: AppFontSizesScaleFactors.normal,
);

Text(
  'Heading',
  style: TextStyle(fontSize: customSizes.h1),
);

Text(
  'Body text',
  style: TextStyle(fontSize: customSizes.body),
);

Recommendations:

  • Use AppFontSizesPresets for common size configurations
  • Use AppFontSizesConstants for compile-time constant values
  • Choose a scaleFactor based on your design system:
    • small (1.13): Compact, information-dense layouts
    • normal (1.17): Balanced, general-purpose
    • large (1.27): Clear hierarchy, better readability
    • extraLarge (1.62): Golden ratio, maximum distinction

See also:

Constructors

AppFontSizes({double bodySmall = AppFontSizesConstants.bodySmall, double scaleFactor = AppFontSizesScaleFactors.large})
Creates a font sizing system with the specified base size and scale factor.

Properties

body → double
Standard body text size.
no setter
bodyLarge → double
Emphasized or larger body text.
no setter
bodySmall → double
The smallest text size in the hierarchy.
no setter
display → double
Display text for hero sections and large titles.
no setter
h1 → double
Top-level heading (H1).
no setter
h2 → double
Second-level heading (H2).
no setter
h3 → double
Third-level heading (H3).
no setter
hashCode → int
The hash code for this object.
no setterinherited
Main section headings.
no setter
paragraphTitle → double
Small headings within content blocks.
no setter
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
subheader → double
Subheadings for content sections.
no setter

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