How to Fix ‘markNeedsBuild’ Error in Syncfusion Flutter Charts After Flutter 3.24.0 Upgrade

Developer: Sheeraz Ali
Designation: Flutter Developer
LinkedIn: Sheeraz Ali
GitHub: thesheerazali

Problem:

After upgrading Flutter to version 3.24.0, the syncfusion_flutter_charts package throws an error related to the use of markNeedsBuild in several files.

Error Locations:

The error occurs in the following files and line numbers:

• syncfusion_flutter_charts/lib/src/charts/common/element_widget.dart:117
• syncfusion_flutter_charts/lib/src/charts/base.dart:3317
• syncfusion_flutter_charts/lib/src/charts/cartesian_chart.dart:1367
• syncfusion_flutter_charts/lib/src/charts/common/core_tooltip.dart:168
• syncfusion_flutter_charts/lib/src/charts/common/core_legend.dart:452

Solution:

To fix the error, change markNeedsBuild to markNeedsLayout in the specified lines of each file.

Steps:

1. Locate the Lines: Open each .dart file and go to the mentioned line numbers.
2. Update the Code:
   • Replace markNeedsBuild with markNeedsLayout.
   dartCopy code// Original code markNeedsBuild(); // Updated code markNeedsLayout();
3. Save and Rebuild: Save the changes and run flutter clean followed by flutter run to rebuild the project.

Conclusion:

Changing markNeedsBuild to markNeedsLayout resolves the error caused by the Flutter upgrade, allowing the syncfusion_flutter_charts package to work correctly.

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