Flutter Theme Factory

Flutter Theme Factory Skill

This skill provides a curated collection of professional Flutter ThemeData configurations, each with carefully selected color palettes, Google Fonts pairings, and component-level theming. Once a theme is chosen, it generates production-ready Dart code.

Purpose

To apply consistent, professional styling to any Flutter application. Each theme includes:

• A cohesive ColorScheme with light and dark variants
• Complementary Google Fonts pairings for display, headline, title, body, and label text
• Component-level theming (AppBarTheme, CardTheme, ElevatedButtonTheme, InputDecorationTheme, etc.)
• A distinct visual identity suitable for different contexts and audiences

Usage Instructions

1. Show available themes: Present the theme list below with descriptions
2. Ask for their choice: Ask which theme to apply
3. Wait for selection: Get explicit confirmation about the chosen theme
4. Generate the theme: Read the selected theme file from themes/ and generate complete Dart code
5. Deliver files: Provide app_theme.dart, app_colors.dart, app_typography.dart ready to drop into their project

Themes Available

Generated Code Structure

Each theme generates:

lib/core/theme/
├── app_theme.dart          # ThemeData for light & dark mode
├── app_colors.dart         # Color constants & ColorScheme
├── app_typography.dart     # Google Fonts TextTheme
└── app_spacing.dart        # Consistent spacing scale

app_theme.dart Pattern

import 'package:flutter/material.dart';
import 'package:google_fonts/google_fonts.dart';
import 'app_colors.dart';
import 'app_typography.dart';

class AppTheme {
  static ThemeData get light => ThemeData(
    useMaterial3: true,
    brightness: Brightness.light,
    colorScheme: AppColors.lightScheme,
    textTheme: AppTypography.textTheme,
    appBarTheme: AppBarTheme(...),
    cardTheme: CardTheme(...),
    elevatedButtonTheme: ElevatedButtonThemeData(...),
    inputDecorationTheme: InputDecorationTheme(...),
    bottomNavigationBarTheme: BottomNavigationBarThemeData(...),
    floatingActionButtonTheme: FloatingActionButtonThemeData(...),
    chipTheme: ChipThemeData(...),
    dividerTheme: DividerThemeData(...),
    // ... all component themes
  );

  static ThemeData get dark => ThemeData(
    useMaterial3: true,
    brightness: Brightness.dark,
    colorScheme: AppColors.darkScheme,
    textTheme: AppTypography.textTheme,
    // ... dark variants
  );
}

app_colors.dart Pattern

import 'package:flutter/material.dart';

class AppColors {
  // Brand colors
  static const Color primary = Color(0xFF...);
  static const Color secondary = Color(0xFF...);
  static const Color accent = Color(0xFF...);
  static const Color surface = Color(0xFF...);

  // Semantic colors
  static const Color success = Color(0xFF...);
  static const Color warning = Color(0xFF...);
  static const Color error = Color(0xFF...);
  static const Color info = Color(0xFF...);

  // Gradients
  static const LinearGradient primaryGradient = LinearGradient(...);
  static const LinearGradient backgroundGradient = LinearGradient(...);

  // Light scheme
  static const ColorScheme lightScheme = ColorScheme(
    brightness: Brightness.light,
    primary: ...,
    onPrimary: ...,
    secondary: ...,
    onSecondary: ...,
    surface: ...,
    onSurface: ...,
    error: ...,
    onError: ...,
    // ... all 30+ ColorScheme properties
  );

  // Dark scheme
  static const ColorScheme darkScheme = ColorScheme(
    brightness: Brightness.dark,
    // ... dark variants
  );
}

app_typography.dart Pattern

import 'package:flutter/material.dart';
import 'package:google_fonts/google_fonts.dart';

class AppTypography {
  static String get _displayFont => GoogleFonts.playfairDisplay().fontFamily!;
  static String get _bodyFont => GoogleFonts.sourceSansPro().fontFamily!;

  static TextTheme get textTheme => TextTheme(
    displayLarge: TextStyle(fontFamily: _displayFont, fontSize: 57, fontWeight: FontWeight.w700),
    displayMedium: TextStyle(fontFamily: _displayFont, fontSize: 45, fontWeight: FontWeight.w600),
    displaySmall: TextStyle(fontFamily: _displayFont, fontSize: 36, fontWeight: FontWeight.w600),
    headlineLarge: TextStyle(fontFamily: _displayFont, fontSize: 32, fontWeight: FontWeight.w600),
    headlineMedium: TextStyle(fontFamily: _displayFont, fontSize: 28, fontWeight: FontWeight.w500),
    headlineSmall: TextStyle(fontFamily: _displayFont, fontSize: 24, fontWeight: FontWeight.w500),
    titleLarge: TextStyle(fontFamily: _bodyFont, fontSize: 22, fontWeight: FontWeight.w600),
    titleMedium: TextStyle(fontFamily: _bodyFont, fontSize: 16, fontWeight: FontWeight.w600),
    titleSmall: TextStyle(fontFamily: _bodyFont, fontSize: 14, fontWeight: FontWeight.w500),
    bodyLarge: TextStyle(fontFamily: _bodyFont, fontSize: 16, fontWeight: FontWeight.w400),
    bodyMedium: TextStyle(fontFamily: _bodyFont, fontSize: 14, fontWeight: FontWeight.w400),
    bodySmall: TextStyle(fontFamily: _bodyFont, fontSize: 12, fontWeight: FontWeight.w400),
    labelLarge: TextStyle(fontFamily: _bodyFont, fontSize: 14, fontWeight: FontWeight.w600),
    labelMedium: TextStyle(fontFamily: _bodyFont, fontSize: 12, fontWeight: FontWeight.w500),
    labelSmall: TextStyle(fontFamily: _bodyFont, fontSize: 11, fontWeight: FontWeight.w500),
  );
}

Application Process

After a preferred theme is selected:

1. Read the corresponding theme file from the themes/ directory
2. Generate complete app_theme.dart, app_colors.dart, app_typography.dart, app_spacing.dart
3. Include pubspec.yaml dependency additions (google_fonts, etc.)
4. Provide usage example in main.dart:

MaterialApp(
  theme: AppTheme.light,
  darkTheme: AppTheme.dark,
  themeMode: ThemeMode.system,
  ...
)

5. Ensure WCAG AA contrast ratios in both light and dark mode
6. Test all Material component themes are properly configured

Create Your Own Theme

For cases where none of the existing themes work:

1. Ask the user for: brand colors (if any), mood/vibe, target audience, app category
2. Generate a custom theme following the same structure as preset themes
3. Give it a descriptive name
4. Show a preview widget that demonstrates the theme across key components
5. Apply the theme after user approval

Preview Widget

When showing a theme preview, generate a ThemePreview widget that displays:

• Color palette swatches
• Typography samples (all text styles)
• Button variants (elevated, filled, outlined, text)
• Card with content
• TextField / Input
• BottomNavigationBar sample
• Chip variants
• Light vs Dark side-by-side comparison