How to make a word UNDERLINE when whole text is in String in Flutter app?

Hey there, Flutter enthusiasts! Are you tired of plain old text in your Flutter app? Want to add some visual flair to make your app stand out? Well, you’re in luck because today we’re going to tackle the age-old question: how to make a word UNDERLINE when the whole text is in a String in Flutter.

Why Underline Text?

Underlining text is a powerful way to draw attention to important information, convey emphasis, or even add a touch of elegance to your app’s design. But, you might ask, why is it so hard to achieve in Flutter? Well, the reason lies in the way Flutter handles text rendering. By default, Flutter treats text as a single entity, making it challenging to apply styles to individual words or characters within a String. But fear not, my friends, for we have some tricks up our sleeves to overcome this limitation.

The Problem with RichText

You might be thinking, “Wait, can’t I just use RichText and wrap the word I want to underline with a TextSpan?” Well, yes and no. While RichText is an excellent way to style individual parts of a text, it has its limitations. When the whole text is in a String, it’s not straightforward to identify the word you want to underline and wrap it with a TextSpan. You’d need to parse the String, identify the target word, and then create a TextSpan for it – not exactly the most efficient or elegant solution.

The Solution: Using Spannable Text

So, what’s the solution? Enter Spannable text, a powerful tool for styling individual parts of a text. With Spannable text, you can create a range of styles, including underline, bold, italic, and more, and apply them to specific parts of a text. The best part? It’s relatively easy to use and integrates seamlessly with Flutter.

Step 1: Add the spannable_text Package

The first step is to add the spannable_text package to your Flutter project. Open your pubspec.yaml file and add the following line:

dependencies:
  flutter:
    sdk: flutter
  spannable_text: ^4.0.1

Then, run flutter pub get to fetch the package.

Step 2: Create a SpannableText Object

Next, create a SpannableText object and pass your text String to it:

import 'package:spannable_text/spannable_text.dart';

SpannableText _spannableText = SpannableText(
  'This is an example sentence with an underlined word',
);

Step 3: Identify the Word to Underline

Now, identify the word you want to underline. You can do this manually or programmatically, depending on your specific requirements. For this example, let’s assume you want to underline the word “example”.

String _underlineWord = 'example';

Step 4: Create a TextSpan for the Underline

Create a TextSpan for the underline style:

TextSpan _underlineTextSpan = TextSpan(
  text: _underlineWord,
  style: TextStyle(
    decoration: TextDecoration.underline,
  ),
);

Step 5: Add the TextSpan to the SpannableText

Add the TextSpan to the SpannableText object, specifying the start and end indices of the word you want to underline:

_spannableText.addSpan(
  _underlineTextSpan,
  'This is an '.length,
  ('This is an ' + _underlineWord).length,
);

Step 6: Display the SpannableText

Finally, display the SpannableText in your Flutter app using the `SpannableTextWidget`:

SpannableTextWidget(
  _spannableText,
)

Putting it All Together

Here’s the complete code example:

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

class UnderlineTextExample extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    String _text = 'This is an example sentence with an underlined word';
    String _underlineWord = 'example';

    SpannableText _spannableText = SpannableText(_text);

    TextSpan _underlineTextSpan = TextSpan(
      text: _underlineWord,
      style: TextStyle(
        decoration: TextDecoration.underline,
      ),
    );

    _spannableText.addSpan(
      _underlineTextSpan,
      'This is an '.length,
      ('This is an ' + _underlineWord).length,
    );

    return Scaffold(
      appBar: AppBar(
        title: Text('Underline Text Example'),
      ),
      body: Center(
        child: SpannableTextWidget(
          _spannableText,
        ),
      ),
    );
  }
}

Troubleshooting and Tips

If you encounter any issues with the above code, here are some troubleshooting tips:

• Make sure you’ve added the spannable_text package correctly and imported it in your Dart file.
• Verify that you’ve correctly identified the start and end indices of the word you want to underline.
• Experiment with different TextStyle properties to customize the underline style.

Conclusion

And that’s it! With these simple steps, you’ve successfully underlined a word in a String in your Flutter app. Remember, the key to achieving this is to use the spannable_text package and create a TextSpan for the underline style. Don’t be afraid to experiment and customize the TextStyle to fit your app’s unique design.

Now, go forth and add some visual flair to your Flutter app!Here are 5 Questions and Answers about “How to make a word UNDERLINE when whole text is in String in Flutter app?” :

Frequently Asked Question

Are you tired of plain text in your Flutter app? Want to add some flair with underlined words? We’ve got you covered!