generateZetaTheme function

Implementation

ThemeData generateZetaTheme({
  required Brightness brightness,
  required ColorScheme colorScheme,
  ThemeData? existingTheme,
  String? fontFamily,
  ZetaThemeData? zetaThemeData,
}) {
  if (existingTheme != null) {
    final baseThemeData = ThemeData();

    // Apply the Zeta styles to the existing theme, ignoring fields that are the same as the default ThemeData.
    return ThemeData(
      brightness: brightness,
      useMaterial3: existingTheme.useMaterial3,
      fontFamily: fontFamily ??
          (existingTheme.textTheme.bodyMedium?.fontFamily == baseThemeData.textTheme.bodyMedium?.fontFamily
              ? kZetaFontFamily
              : existingTheme.textTheme.bodyMedium?.fontFamily),
      scaffoldBackgroundColor: [
        Colors.grey[850]!,
        Colors.grey[50]!,
        baseThemeData.scaffoldBackgroundColor,
        baseThemeData.colorScheme.surface,
      ].any((e) => e == existingTheme.scaffoldBackgroundColor)
          ? colorScheme.surfaceTertiary
          : existingTheme.scaffoldBackgroundColor,
      colorScheme:
          ((existingTheme.colorScheme == baseThemeData.colorScheme ? null : existingTheme.colorScheme) ?? colorScheme)
              .copyWith(brightness: brightness),
      textTheme: (existingTheme.textTheme == baseThemeData.textTheme ? null : existingTheme.textTheme) ?? zetaTextTheme,
      iconTheme: (existingTheme.iconTheme == baseThemeData.iconTheme ? null : existingTheme.iconTheme) ??
          const IconThemeData(size: kZetaIconSize),
      actionIconTheme: existingTheme.actionIconTheme,
      applyElevationOverlayColor: existingTheme.applyElevationOverlayColor,
      cupertinoOverrideTheme: existingTheme.cupertinoOverrideTheme,
      inputDecorationTheme: existingTheme.inputDecorationTheme,
      materialTapTargetSize: existingTheme.materialTapTargetSize,
      pageTransitionsTheme: existingTheme.pageTransitionsTheme,
      platform: existingTheme.platform,
      scrollbarTheme: existingTheme.scrollbarTheme,
      splashFactory: existingTheme.splashFactory,
      visualDensity: existingTheme.visualDensity,
      canvasColor: existingTheme.canvasColor,
      cardColor: existingTheme.cardColor,
      dialogBackgroundColor: existingTheme.dialogBackgroundColor,
      disabledColor: existingTheme.disabledColor,
      dividerColor: existingTheme.dividerColor,
      focusColor: existingTheme.focusColor,
      highlightColor: existingTheme.highlightColor,
      hintColor: existingTheme.hintColor,
      hoverColor: existingTheme.hoverColor,
      indicatorColor: existingTheme.indicatorColor,
      primaryColor: existingTheme.primaryColor,
      primaryColorDark: existingTheme.primaryColorDark,
      primaryColorLight: existingTheme.primaryColorLight,
      secondaryHeaderColor: existingTheme.secondaryHeaderColor,
      shadowColor: existingTheme.shadowColor,
      splashColor: existingTheme.splashColor,
      unselectedWidgetColor: existingTheme.unselectedWidgetColor,
      primaryIconTheme: existingTheme.primaryIconTheme,
      primaryTextTheme: existingTheme.primaryTextTheme,
      typography: existingTheme.typography,
      appBarTheme: existingTheme.appBarTheme,
      badgeTheme: existingTheme.badgeTheme,
      bannerTheme: existingTheme.bannerTheme,
      bottomAppBarTheme: existingTheme.bottomAppBarTheme,
      bottomNavigationBarTheme: existingTheme.bottomNavigationBarTheme,
      bottomSheetTheme: existingTheme.bottomSheetTheme,
      buttonTheme: existingTheme.buttonTheme,
      cardTheme: existingTheme.cardTheme,
      checkboxTheme: existingTheme.checkboxTheme,
      chipTheme: existingTheme.chipTheme,
      dataTableTheme: existingTheme.dataTableTheme,
      datePickerTheme: existingTheme.datePickerTheme,
      dialogTheme: existingTheme.dialogTheme,
      dividerTheme: existingTheme.dividerTheme,
      drawerTheme: existingTheme.drawerTheme,
      dropdownMenuTheme: existingTheme.dropdownMenuTheme,
      elevatedButtonTheme: existingTheme.elevatedButtonTheme,
      expansionTileTheme: existingTheme.expansionTileTheme,
      filledButtonTheme: existingTheme.filledButtonTheme,
      floatingActionButtonTheme: existingTheme.floatingActionButtonTheme,
      iconButtonTheme: existingTheme.iconButtonTheme,
      listTileTheme: existingTheme.listTileTheme,
      menuBarTheme: existingTheme.menuBarTheme,
      menuButtonTheme: existingTheme.menuButtonTheme,
      menuTheme: existingTheme.menuTheme,
      navigationBarTheme: existingTheme.navigationBarTheme,
      navigationDrawerTheme: existingTheme.navigationDrawerTheme,
      navigationRailTheme: existingTheme.navigationRailTheme,
      outlinedButtonTheme: existingTheme.outlinedButtonTheme,
      popupMenuTheme: existingTheme.popupMenuTheme,
      progressIndicatorTheme: existingTheme.progressIndicatorTheme,
      radioTheme: existingTheme.radioTheme,
      searchBarTheme: existingTheme.searchBarTheme,
      searchViewTheme: existingTheme.searchViewTheme,
      segmentedButtonTheme: existingTheme.segmentedButtonTheme,
      sliderTheme: existingTheme.sliderTheme,
      snackBarTheme: existingTheme.snackBarTheme,
      switchTheme: existingTheme.switchTheme,
      tabBarTheme: existingTheme.tabBarTheme,
      textButtonTheme: existingTheme.textButtonTheme,
      textSelectionTheme: existingTheme.textSelectionTheme,
      timePickerTheme: existingTheme.timePickerTheme,
      toggleButtonsTheme: existingTheme.toggleButtonsTheme,
      tooltipTheme: existingTheme.tooltipTheme,
    );
  }
  return ThemeData(
    useMaterial3: true,
    fontFamily: fontFamily ?? kZetaFontFamily,
    brightness: brightness,
    scaffoldBackgroundColor: colorScheme.surfaceTertiary,
    colorScheme: colorScheme.copyWith(brightness: brightness),
    textTheme: zetaTextTheme,
    iconTheme: IconThemeData(
      size: kZetaIconSize,
      color: (zetaThemeData != null
          ? (brightness == Brightness.dark ? zetaThemeData.colorsDark : zetaThemeData.colorsLight).iconDefault
          : colorScheme.onSurface),
    ),
  );
}