Product List Selection Modal Shows 'DraggableScrollableSheet Assertion Error:' On Small Devices

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Introduction

When attempting to create a list in the Lists screen by clicking on the Create button, the app shows a 'package:flutter/src/widgets/draggable_scrollable_sheet.dart': Failed assertion: line 311 pos 16: 'initialChildSize <= maxChildSize': is not true error on small devices. This error occurs on all Android devices with a screen size around 6.4 inches. In this article, we will explore the steps to reproduce this behavior and provide a solution to resolve the issue.

Error Log

The error log is as follows:

Another exception was thrown: 'package:flutter/src/widgets/draggable_scrollable_sheet.dart':
Failed assertion: line 311 pos 16: 'initialChildSize <= maxChildSize': is not true.

Steps to Reproduce the Behavior

To reproduce this behavior, follow these steps:

  1. Navigate to the Lists Screen: Go to the Lists screen from the Navigation button.
  2. Click on All Viewed Products: Click on the "All viewed products" option on the top left corner of the screen.
  3. Click on Create: Click on the Create button to create a new list.
  4. Observe the Error: Observe the error message that appears on the screen.

The Error Persists Even When Renaming the List

The error persists even when attempting to rename the newly created list. This indicates that the issue is not specific to the creation of a new list, but rather a general issue with the DraggableScrollableSheet widget on small devices.

Smartphone Models Affected

The error has been observed on the following smartphone models:

  • Samsung S22 FE
  • IQOO
  • iPhone 15 Plus

Possible Causes

Based on the error message, it appears that the issue is related to the initialChildSize and maxChildSize properties of the DraggableScrollableSheet widget. The error message suggests that the initialChildSize is greater than the maxChildSize, which is not allowed.

Solution

To resolve this issue, we need to ensure that the initialChildSize is less than or equal to the maxChildSize. We can do this by setting the initialChildSize to a value that is less than or equal to the maxChildSize.

Code Solution

Here is an example of how to modify the code to resolve the issue:

DraggableScrollableSheet(
  initialChildSize: 0.5, // Set initialChildSize to 0.5
  maxChildSize: 0.8, // Set maxChildSize to 0.8
  child: // Your child widget here
)

By setting the initialChildSize to 0.5 and the maxChildSize to 0.8, we ensure that the initialChildSize is less than or equal to the maxChildSize, which resolves the error.

Conclusion

In conclusion, the product list selection modal shows a 'DraggableScrollableSheet assertion error:' on small devices due to an issue with the initialChildSize and maxChildSize properties of the DraggableScrollableSheet widget. By setting the initialChildSize to a value that is less than or equal to the maxChildSize, we can resolve the issue and ensure that the app functions correctly on small devices.

Recommendations

Based on our analysis, we recommend the following:

  • Ensure that the initialChildSize is less than or equal to the maxChildSize when using the DraggableScrollableSheet widget.
  • Test the app on small devices to ensure that the issue is resolved.
  • Consider using a different widget or approach if the issue persists.

Future Work

Introduction

In our previous article, we explored the issue of the product list selection modal showing a 'DraggableScrollableSheet assertion error:' on small devices. We also provided a solution to resolve the issue by setting the initialChildSize to a value that is less than or equal to the maxChildSize. In this article, we will answer some frequently asked questions (FAQs) related to this issue.

Q: What is the cause of the 'DraggableScrollableSheet assertion error:' on small devices?

A: The cause of the 'DraggableScrollableSheet assertion error:' on small devices is due to an issue with the initialChildSize and maxChildSize properties of the DraggableScrollableSheet widget. The initialChildSize is greater than the maxChildSize, which is not allowed.

Q: Which devices are affected by this issue?

A: The issue has been observed on the following smartphone models:

  • Samsung S22 FE
  • IQOO
  • iPhone 15 Plus

Q: How can I resolve the issue?

A: To resolve the issue, you need to ensure that the initialChildSize is less than or equal to the maxChildSize. You can do this by setting the initialChildSize to a value that is less than or equal to the maxChildSize.

Q: What is the recommended value for initialChildSize and maxChildSize?

A: The recommended value for initialChildSize and maxChildSize is as follows:

  • initialChildSize: 0.5
  • maxChildSize: 0.8

Q: Can I use a different widget instead of DraggableScrollableSheet?

A: Yes, you can use a different widget instead of DraggableScrollableSheet. However, you need to ensure that the new widget meets the requirements of your app.

Q: How can I test the app on small devices?

A: To test the app on small devices, you can use a physical device or an emulator. Make sure to test the app on different devices and screen sizes to ensure that the issue is resolved.

Q: What are the best practices for using DraggableScrollableSheet?

A: The best practices for using DraggableScrollableSheet are as follows:

  • Ensure that the initialChildSize is less than or equal to the maxChildSize.
  • Use a value for initialChildSize that is less than or equal to the maxChildSize.
  • Test the app on small devices to ensure that the issue is resolved.

Q: Can I use DraggableScrollableSheet in a production app?

A: Yes, you can use DraggableScrollableSheet in a production app. However, you need to ensure that the issue is resolved and the app functions correctly on small devices.

Conclusion

In conclusion, the product list selection modal shows a 'DraggableScrollableSheet assertion error:' on small devices due to an issue with the initialChildSize and maxChildSize properties of the DraggableScrollableSheet widget. By setting the initialChildSize to a value that is less than or equal to the maxChildSize, we can resolve the issue and ensure that the app functions correctly on small devices.

Recommendations

Based on our analysis, we recommend the following:

  • Ensure that the initialChildSize is less than or equal to the maxChildSize when using the DraggableScrollableSheet widget.
  • Test the app on small devices to ensure that the issue is resolved.
  • Consider using a different widget or approach if the issue persists.

Future Work

In future work, we plan to investigate other possible causes of this issue and explore additional solutions to resolve the problem. We also plan to conduct further testing to ensure that the issue is fully resolved.