Flutter Text Style

Summary

In this lesson we'll cover: how to style text using TextTheme, custom fonts and basic Material Design theming with TextStyle. We'll also cover code organization when working with style.

The Code for This Lesson

Check out the tourismandco repo's step/step04 branch for the code we'll cover in this lesson.

Styling text using TextTheme, fonts assets and TextStyle

• In order to style our text, let's use a custom font.
• Create a new directory called assets/fonts.
• Copy the font files located at assets/fonts in the step/step03 branch of this repo and copy it to our new directory.
• Update our pubspec.yaml file so we can use our fonts.

Adding fonts to pubspec.yaml

# pubspec.yaml

flutter:
  # ...

  fonts:
    - family: Montserrat
      fonts:
        - asset: assets/fonts/Montserrat-Regular.ttf
          weight: 300
        - asset: assets/fonts/Montserrat-Bold.ttf
          weight: 600

  # ...

• Again, be careful of the indentation here.

• Note: this screen isn't currently scrollable, so if the content for this screen overflows, we'll see some weird rendering issues. Later, we'll take care of this issue.

Using an App-Wide TextTheme

• We can define app-wide style using the theme parameter of our MaterialApp widget, located in app.dart.
• Update our app.dart to the following:

// app.dart

import 'package:flutter/material.dart';
import 'screens/location_detail/location_detail.dart';
import 'style.dart';

class App extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      home: LocationDetail(),
      theme: ThemeData(textTheme: TextTheme(body1: Body1Style)),
    );
  }
}

// ...

• Here, we can style all text using the textTheme param of ThemeData.
• Warning: note that we'll importing a new file here, style.dart.
• Next, let's create a style.dart file so we can cleanly keep all our app styles in one place.

Adding style.dart

// style.dart

import 'package:flutter/material.dart';

const String FontNameDefault = 'Montserrat';

const Body1Style = TextStyle(
  fontFamily: FontNameDefault,
  fontWeight: FontWeight.w300,
  fontSize: 26.0,
  color: Colors.black,
);

• Note that we're using const here (a "constant"), which ensures that the value of this constant is assigned at compile-time rather than runtime. A small optimization.
• TextStyle allows to style an individual Text widget using its style param.
• Yet we won't do this, as we using ThemeData, no code changes will be needed. Pretty cool.
• Stop and re-start the app to see the changes.
• Note that if we add new files or make changes to any const variables, we'll need to restart our app, as these changes aren't supported by Flutter's Hot Reload feature.

Summary

In this lesson, we covered the basics of layout, imagesand text. Our "Tourism & Co." app is taking shape.