Flutter Simple Calculator

Flutter Simple Calculator



Flutter Simple Calculator


Flutter Simple Calculator

Input Widgets

input widgets is all extends StatefulWidget, because they need to response the onTap gesture.

  • NumberButton. Rendering the number button (like 1,2,3…) and handling the onTap gesture.

  • OperatorButton. Rendering the operator button (like +,-,*…) and handling the onTap gesture.

  • ResultButton. Rendering the command button (like clear,equal…) and handling the onTap gesture.

Output Widgets

output widgets is all extends StatelessWidget, because they are just rendering.

  • ResultDisplay. Rendering the current result and changing display when user tap a number button.

  • HistoryBlock. Rendering the calculation histories and changing display every time when user tap a valid button.


CalculatorPage is extends StatefulWidget and holding the List of result.

CalculatorPage receives every input widgets onTap event, makes a logical calculation for these input and decide what to display to output widgets.


This repo is inspired by react-calculator.

Thanks to the author’s awesome idea and app ui.



Source Code

Please Visit Flutter Simple Calculator Source Code at GitHub