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src/CalcManager/Header Files/ICalcDisplay.h

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+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+#pragma once
+
+// Callback interface to be implemented by the clients of CCalcEngine
+class ICalcDisplay {
+public:
+    virtual void SetPrimaryDisplay(const std::wstring& pszText, bool isError) = 0;
+    virtual void SetIsInError(bool isInError) = 0;
+    virtual void SetExpressionDisplay(_Inout_ std::shared_ptr<CalculatorVector<std::pair<std::wstring, int>>> const &tokens, _Inout_ std::shared_ptr<CalculatorVector<std::shared_ptr<IExpressionCommand>>> const &commands) = 0;
+    virtual void SetParenDisplayText(const std::wstring& pszText) = 0;
+    virtual void MaxDigitsReached() = 0; // not an error but still need to inform UI layer.
+    virtual void BinaryOperatorReceived() = 0;
+    virtual void OnHistoryItemAdded(_In_ unsigned int addedItemIndex) = 0;
+    virtual void SetMemorizedNumbers(const std::vector<std::wstring>& memorizedNumbers) = 0;
+    virtual void MemoryItemChanged(unsigned int indexOfMemory) = 0;
+};