flutter_calculator
Build a calculator app in iOS and Android with the same code by using flutter.
Structure
Input Widgets
input widgets is all extends StatefulWidget, because they need to response the onTap gesture.
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NumberButton. Rendering the number button (like 1,2,3...) and handling the onTap gesture.
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OperatorButton. Rendering the operator button (like +,-,*...) and handling the onTap gesture.
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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.
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ResultDisplay. Rendering the current result and changing display when user tap a number button.
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HistoryBlock. Rendering the calculation histories and changing display every time when user tap a valid button.
CalculatorPage
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.
