dart - How to auto scale down a font in a Text widget to fit the max number of lines?

Dart - How to auto scale down a font in a Text widget to fit the max number of lines?

To automatically scale down a font in a Text widget to fit the maximum number of lines, you can use the FittedBox widget along with Text. FittedBox automatically scales its child to fit the available space. However, it doesn't handle multiline text by itself. We can use Text widget inside FittedBox and specify the maxLines property of Text to ensure it doesn't exceed the desired number of lines. Here's an example:

import 'package:flutter/material.dart'; void main() { runApp(MyApp()); } class MyApp extends StatelessWidget { @override Widget build(BuildContext context) { return MaterialApp( home: Scaffold( appBar: AppBar( title: Text('Auto Scale Font Example'), ), body: Center( child: Container( width: 200, // Adjust container width as needed height: 100, // Adjust container height as needed color: Colors.grey[300], child: FittedBox( fit: BoxFit.scaleDown, child: Text( 'Your long text goes here...', maxLines: 2, // Maximum number of lines textAlign: TextAlign.center, style: TextStyle( fontSize: 24, // Initial font size fontWeight: FontWeight.bold, ), ), ), ), ), ), ); } }

In this example:

  • FittedBox scales its child Text widget to fit within the dimensions of the container.
  • maxLines property of the Text widget ensures that the text does not exceed the specified number of lines.
  • fit property of FittedBox is set to BoxFit.scaleDown to scale the child down if necessary.

Adjust the fontSize and other properties of the TextStyle according to your requirements. Also, adjust the dimensions of the container as needed to fit your layout.

Examples

  1. Query: "Flutter Text auto-scale to fit within given lines"

    • Description: This query explores how to make the font size of a Text widget adjust automatically to ensure the text fits within a given number of lines.
    • Code:
      Text( 'This is a very long text that needs to be scaled down to fit within the designated number of lines.', style: TextStyle(fontSize: 20), maxLines: 2, overflow: TextOverflow.ellipsis, softWrap: true, textScaleFactor: 1.0, // Default scale factor )

  2. Query: "Flutter Text overflow handling with ellipsis"

    • Description: This query focuses on using the ellipsis to indicate text overflow in a Text widget, ensuring that extra text is truncated when it doesn't fit within the max number of lines.
    • Code:
      Text( 'This is an example of text that may overflow, but using ellipsis can help manage it.', style: TextStyle(fontSize: 18), maxLines: 2, overflow: TextOverflow.ellipsis, // Ellipsis for overflow )

  3. Query: "Flutter AutoSizeText to auto-scale font size"

    • Description: This query discusses using the AutoSizeText package to automatically adjust the font size to fit the text within a specified number of lines.
    • Code:
      # In pubspec.yaml, add the package dependencies: auto_size_text: ^3.0.0
    • Usage:
      import 'package:auto_size_text/auto_size_text.dart'; AutoSizeText( 'This text will automatically scale down to fit within the specified number of lines.', style: TextStyle(fontSize: 20), maxLines: 2, // Auto scale to fit within 2 lines )

  4. Query: "Flutter Text widget with auto scale and alignment"

    • Description: This query explores aligning text within the Text widget while ensuring it auto-scales to fit the maximum number of lines.
    • Code:
      AutoSizeText( 'Aligned and auto-scaled text to fit the space.', style: TextStyle(fontSize: 18), maxLines: 2, textAlign: TextAlign.center, // Align text )

  5. Query: "Flutter AutoSizeText with different font weights"

    • Description: This query explores how to use AutoSizeText with different font weights while ensuring text auto-scales to fit the given space.
    • Code:
      AutoSizeText( 'Auto-scaled text with different font weights', style: TextStyle(fontWeight: FontWeight.bold, fontSize: 24), maxLines: 2, )

  6. Query: "Flutter AutoSizeText with wrapping text"

    • Description: This query explores how to make AutoSizeText wrap text while auto-scaling to fit the designated number of lines, allowing more control over text formatting.
    • Code:
      AutoSizeText( 'This is an example of text that should wrap and auto-scale to fit within the given lines.', style: TextStyle(fontSize: 18), maxLines: 2, wrapWords: true, // Allow text to wrap )

  7. Query: "Flutter AutoSizeText with multiline text"

    • Description: This query focuses on using AutoSizeText to handle multiline text, ensuring it auto-scales to fit within the max number of lines specified.
    • Code:
      AutoSizeText( 'This text will be auto-scaled to fit within the allowed lines even with multiple paragraphs.', style: TextStyle(fontSize: 20), maxLines: 3, // Allow up to 3 lines )

  8. Query: "Flutter Text widget with constrained height"

    • Description: This query explores using a constrained height to limit the Text widget's size and auto-scaling the text to fit within the constraint.
    • Code:
      SizedBox( height: 50, child: AutoSizeText( 'Constrained height with auto-scaling text', style: TextStyle(fontSize: 18), maxLines: 2, ), )

  9. Query: "Flutter AutoSizeText with customized scaling"

    • Description: This query explores customizing the scaling behavior of AutoSizeText by adjusting the text's minimum font size and scaling factor.
    • Code:
      AutoSizeText( 'Customized scaling for AutoSizeText', style: TextStyle(fontSize: 24), minFontSize: 10, // Set minimum font size stepGranularity: 2, // Control how much the font scales down maxLines: 2, )

  10. Query: "Flutter AutoSizeText with custom text style"

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