Скачать или смотреть How to Display Only a Part of a Widget in Flutter Using SizedBox

Learn how to limit the height of a widget in Flutter to show only a specific number of lines. This article focuses on using `SizedBox` to achieve this functionality with the `flutter_html` package.
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This video is based on the question https://stackoverflow.com/q/67656683/ asked by the user 'CLKH' ( https://stackoverflow.com/u/14617500/ ) and on the answer https://stackoverflow.com/a/67656710/ provided by the user 'DNS' ( https://stackoverflow.com/u/3177054/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Display Only a Part of a Widget in Flutter Using SizedBox

In the world of mobile app development with Flutter, you may encounter situations where you want to display only a specific part of a widget. For instance, when using the flutter_html package, your inputs can be unpredictable, and you might want to limit the visible area of the widget to just a few lines of text or a certain height. This ensures that the hidden part doesn’t take up any space, leading to a cleaner UI.

The Problem

You’re utilizing the flutter_html widget to render HTML content within your Flutter app. However, you only want to show a portion of this widget due to varying lengths of input. You need a solution that allows you to limit the height of the rendered text, such as displaying only three lines and ensuring that any content beyond this isn’t displayed or occupying space on the screen.

The Solution: Using SizedBox

Step-by-Step Implementation

The most straightforward way to solve this problem is by wrapping your Html widget inside a SizedBox. This method allows you to define a specific height for the widget, making it possible to limit its visual representation regardless of the content length.

Example Code

Here’s how to do it:

[[See Video to Reveal this Text or Code Snippet]]

Breakdown of the Code

SizedBox Widget:

The SizedBox widget is used to create a box with a specified size. By setting a height, you control how much space the Html widget uses on the screen.

You can change the height property according to what fits best in your design.

Html Widget:

Inside the SizedBox, you use the Html widget from the flutter_html package to parse and render the HTML content.

The data parameter should contain your HTML content. Whether it's plain text, formatted text, or links, this widget will handle it.

Benefits of This Approach

Clean UI: Ensures that extra content is hidden and doesn’t clutter the interface.

Flexible Height Adjustment: You can easily adjust the height based on the design requirements or the number of lines you wish to show.

Performance Optimization: By limiting the widget size, it may help in optimizing performance, especially when rendering complex HTML content.

Conclusion

Displaying only part of a widget in Flutter can be achieved efficiently using the SizedBox widget. This approach not only enhances the visual appeal of your app but also keeps the user experience intact by presenting information in a manageable way. Whether you're dealing with unpredictable text lengths or just want to keep your interface tidy, implementing this solution will help you achieve your desired outcome effectively.

Feel free to experiment with different heights to find the best fit for your application, and enjoy building beautiful Flutter UIs!