lib/studies/shrine/theme.dart

// Copyright 2019 The Flutter team. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

import 'package:flutter/material.dart';
import 'package:google_fonts/google_fonts.dart';
import 'package:gallery/studies/shrine/colors.dart';
import 'package:gallery/studies/shrine/supplemental/cut_corners_border.dart';

const defaultLetterSpacing = 0.03;
const mediumLetterSpacing = 0.04;
const largeLetterSpacing = 1.0;

final ThemeData shrineTheme = _buildShrineTheme();

IconThemeData _customIconTheme(IconThemeData original) {
  return original.copyWith(color: shrineBrown900);
}

ThemeData _buildShrineTheme() {
  final ThemeData base = ThemeData.light();
  return base.copyWith(
    colorScheme: _shrineColorScheme,
    accentColor: shrineBrown900,
    primaryColor: shrinePink100,
    buttonColor: shrinePink100,
    scaffoldBackgroundColor: shrineBackgroundWhite,
    cardColor: shrineBackgroundWhite,
    textSelectionColor: shrinePink100,
    errorColor: shrineErrorRed,
    buttonTheme: const ButtonThemeData(
      colorScheme: _shrineColorScheme,
      textTheme: ButtonTextTheme.normal,
    ),
    primaryIconTheme: _customIconTheme(base.iconTheme),
    inputDecorationTheme: const InputDecorationTheme(
      border: CutCornersBorder(
        borderSide: BorderSide(color: shrineBrown900, width: 0.5),
      ),
      contentPadding: EdgeInsets.symmetric(vertical: 20, horizontal: 16),
    ),
    textTheme: _buildShrineTextTheme(base.textTheme),
    primaryTextTheme: _buildShrineTextTheme(base.primaryTextTheme),
    accentTextTheme: _buildShrineTextTheme(base.accentTextTheme),
    iconTheme: _customIconTheme(base.iconTheme),
  );
}

TextTheme _buildShrineTextTheme(TextTheme base) {
  return GoogleFonts.rubikTextTheme(base
      .copyWith(
        headline: base.headline.copyWith(
          fontWeight: FontWeight.w500,
          letterSpacing: defaultLetterSpacing,
        ),
        title: base.title.copyWith(
          fontSize: 18,
          letterSpacing: defaultLetterSpacing,
        ),
        caption: base.caption.copyWith(
          fontWeight: FontWeight.w400,
          fontSize: 14,
          letterSpacing: defaultLetterSpacing,
        ),
        body2: base.body2.copyWith(
          fontWeight: FontWeight.w500,
          fontSize: 16,
          letterSpacing: defaultLetterSpacing,
        ),
        body1: base.body1.copyWith(
          letterSpacing: defaultLetterSpacing,
        ),
        subhead: base.subhead.copyWith(
          letterSpacing: defaultLetterSpacing,
        ),
        display1: base.display1.copyWith(
          letterSpacing: defaultLetterSpacing,
        ),
        button: base.button.copyWith(
          fontWeight: FontWeight.w500,
          fontSize: 14,
          letterSpacing: defaultLetterSpacing,
        ),
      )
      .apply(
        displayColor: shrineBrown900,
        bodyColor: shrineBrown900,
      ));
}

const ColorScheme _shrineColorScheme = ColorScheme(
  primary: shrinePink100,
  primaryVariant: shrineBrown900,
  secondary: shrinePink50,
  secondaryVariant: shrineBrown900,
  surface: shrineSurfaceWhite,
  background: shrineBackgroundWhite,
  error: shrineErrorRed,
  onPrimary: shrineBrown900,
  onSecondary: shrineBrown900,
  onSurface: shrineBrown900,
  onBackground: shrineBrown900,
  onError: shrineSurfaceWhite,
  brightness: Brightness.light,
);