Don't call Reset/Clear when users refresh currency rates v2

src/CalcManager/UnitConverter.cpp

@@ -63,6 +63,7 @@ UnitConverter::UnitConverter(_In_ const shared_ptr<IConverterDataLoader>& dataLo
     unquoteConversions[L"{sc}"] = L';';
     unquoteConversions[L"{lb}"] = LEFTESCAPECHAR;
     unquoteConversions[L"{rb}"] = RIGHTESCAPECHAR;
+    ClearValues();
     Reset();
 }
 
@@ -836,7 +837,6 @@ void UnitConverter::Reset()
 {
     m_categories = m_dataLoader->LoadOrderedCategories();
 
-    ClearValues();
     m_switchedActive = false;
 
     if (m_categories.empty())
@@ -881,7 +881,6 @@ void UnitConverter::Reset()
     }
 
     InitializeSelectedUnits();
-    Calculate();
 }
 
 /// <summary>
@@ -972,11 +971,20 @@ bool UnitConverter::AnyUnitIsEmpty()
 /// </summary>
 void UnitConverter::Calculate()
 {
-    unordered_map<Unit, ConversionData, UnitHash> conversionTable = m_ratioMap[m_fromType];
+    if (AnyUnitIsEmpty())
-    double returnValue = stod(m_currentDisplay);
-    if (AnyUnitIsEmpty() || (conversionTable[m_toType].ratio == 1.0 && conversionTable[m_toType].offset == 0.0))
     {
         m_returnDisplay = m_currentDisplay;
+        m_returnHasDecimal = m_currentHasDecimal;
+        TrimString(m_returnDisplay);
+        return;
+    }
+
+    unordered_map<Unit, ConversionData, UnitHash> conversionTable = m_ratioMap[m_fromType];
+    double returnValue = stod(m_currentDisplay);
+    if (conversionTable[m_toType].ratio == 1.0 && conversionTable[m_toType].offset == 0.0)
+    {
+        m_returnDisplay = m_currentDisplay;
+        m_returnHasDecimal = m_currentHasDecimal;
         TrimString(m_returnDisplay);
     }
     else
@@ -1015,9 +1023,8 @@ void UnitConverter::Calculate()
             m_returnDisplay = returnString;
             TrimString(m_returnDisplay);
         }
-    }
-
         m_returnHasDecimal = (m_returnDisplay.find(L'.') != m_returnDisplay.npos);
+    }
 }
 
 /// <summary>
@@ -1078,3 +1085,10 @@ void UnitConverter::UpdateViewModel()
     m_vmCallback->DisplayCallback(m_currentDisplay, m_returnDisplay);
     m_vmCallback->SuggestedValueCallback(CalculateSuggested());
 }
+
+void UnitConverter::ResetCategoriesAndRatio()
+{
+    Reset();
+    Calculate();
+    UpdateViewModel();
+}

src/CalcManager/UnitConverter.h

@@ -1,4 +1,4 @@
-// Copyright (c) Microsoft Corporation. All rights reserved.
+// Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
 
 #pragma once
@@ -195,6 +195,7 @@ namespace UnitConversionManager
         virtual void SetViewModelCallback(_In_ const std::shared_ptr<IUnitConverterVMCallback>& newCallback) = 0;
         virtual void SetViewModelCurrencyCallback(_In_ const std::shared_ptr<IViewModelCurrencyCallback>& newCallback) = 0;
         virtual concurrency::task<std::pair<bool, std::wstring>> RefreshCurrencyRatios() = 0;
+        virtual void ResetCategoriesAndRatio() = 0;
     };
 
     class UnitConverter : public IUnitConverter, public std::enable_shared_from_this<UnitConverter>
@@ -220,6 +221,7 @@ namespace UnitConversionManager
         concurrency::task<std::pair<bool, std::wstring>> RefreshCurrencyRatios() override;
         // IUnitConverter
 
+        void ResetCategoriesAndRatio();
         static std::vector<std::wstring> StringToVector(const std::wstring& w, const wchar_t * delimiter, bool addRemainder = false);
         static std::wstring Quote(const std::wstring& s);
         static std::wstring Unquote(const std::wstring& s);

src/CalcViewModel/UnitConverterViewModel.cpp

@@ -1,4 +1,4 @@
-// Copyright (c) Microsoft Corporation. All rights reserved.
+// Copyright (c) Microsoft Corporation. All rights reserved.
 // Licensed under the MIT License.
 
 #include "pch.h"
@@ -175,12 +175,16 @@ void UnitConverterViewModel::PopulateData()
 }
 
 void UnitConverterViewModel::OnCategoryChanged(Object^ parameter)
+{
+    m_model->SendCommand(UCM::Command::Clear);
+    ResetCategory();
+}
+
+void UnitConverterViewModel::ResetCategory()
 {
     UCM::Category currentCategory = CurrentCategory->GetModelCategory();
     IsCurrencyCurrentCategory = currentCategory.id == NavCategory::Serialize(ViewMode::Currency);
 
-    m_model->SendCommand(UCM::Command::Clear);
-
     m_isInputBlocked = false;
     SetSelectedUnits();
 
@@ -716,7 +720,8 @@ void UnitConverterViewModel::OnCurrencyDataLoadFinished(bool didLoad)
 {
     m_isCurrencyDataLoaded = true;
     CurrencyDataLoadFailed = !didLoad;
-    ResetView();
+    m_model->ResetCategoriesAndRatio();
+    ResetCategory();
 
     StringReference key = didLoad ? UnitConverterResourceKeys::CurrencyRatesUpdated : UnitConverterResourceKeys::CurrencyRatesUpdateFailed;
     String^ announcement = AppResourceProvider::GetInstance().GetResourceString(key);

src/CalcViewModel/UnitConverterViewModel.h

@@ -242,6 +242,7 @@ namespace CalculatorApp
             void UpdateValue2AutomationName();
             Platform::String^ Serialize();
             void Deserialize(Platform::String^ state);
+            void ResetCategoriesAndRatio();
 
             // Saving And Restoring User Preferences of Category and Associated-Units across Sessions.
             void SaveUserPreferences();
@@ -282,6 +283,7 @@ namespace CalculatorApp
             void RefreshSupplementaryResults();
             void UpdateInputBlocked(_In_ const std::wstring& currencyInput);
             bool UnitsAreValid();
+            void ResetCategory();
 
             void OnButtonPressed(Platform::Object^ parameter);
             Platform::String^ ConvertToLocalizedString(const std::wstring& stringToLocalize, bool allowPartialStrings);