Convert ApplicationViewModel to C#

2025-08-21 22:03:11 -07:00 · 2022-09-30 09:25:20 -07:00 · 2022-09-30 09:25:20 -07:00 · 505b669ece
commit 505b669ece
parent 62ca1ddf1c
16 changed files with 362 additions and 419 deletions
--- a/src/CalcViewModel/ApplicationViewModel.cpp
+++ b/src/CalcViewModel/ApplicationViewModel.cpp
@ -1,274 +0,0 @@
-// Copyright (c) Microsoft Corporation. All rights reserved.
-// Licensed under the MIT License.
-
-#include "pch.h"
-#include "ApplicationViewModel.h"
-#include "Common/TraceLogger.h"
-#include "Common/AppResourceProvider.h"
-#include "StandardCalculatorViewModel.h"
-#include "DateCalculatorViewModel.h"
-#include "DataLoaders/CurrencyHttpClient.h"
-#include "DataLoaders/CurrencyDataLoader.h"
-#include "DataLoaders/UnitConverterDataLoader.h"
-
-using namespace CalculatorApp;
-using namespace CalculatorApp::ViewModelNative::Common;
-using namespace CalculatorApp::ViewModelNative::DataLoaders;
-using namespace CalculatorApp::ViewModelNative;
-using namespace CalculationManager;
-using namespace Platform;
-using namespace Platform::Collections;
-using namespace std;
-using namespace Windows::System;
-using namespace Windows::Storage;
-using namespace Utils;
-using namespace Windows::Foundation::Collections;
-using namespace Windows::Globalization;
-using namespace Windows::UI::ViewManagement;
-using namespace Windows::UI::Core;
-using namespace Windows::UI::Xaml::Automation;
-using namespace Windows::UI::Xaml::Controls;
-using namespace Windows::UI::Xaml::Data;
-using namespace Windows::UI::Xaml::Input;
-using namespace Windows::UI::Xaml::Media;
-using namespace Windows::Foundation;
-using namespace Concurrency;
-
-namespace
-{
-    StringReference CategoriesPropertyName(L"Categories");
-    StringReference ClearMemoryVisibilityPropertyName(L"ClearMemoryVisibility");
-}
-
-ApplicationViewModel::ApplicationViewModel()
-    : m_CalculatorViewModel(nullptr)
-    , m_DateCalcViewModel(nullptr)
-    , m_GraphingCalcViewModel(nullptr)
-    , m_ConverterViewModel(nullptr)
-    , m_PreviousMode(ViewMode::None)
-    , m_mode(ViewMode::None)
-    , m_categories(nullptr)
-{
-    SetMenuCategories();
-}
-
-void ApplicationViewModel::Mode::set(ViewMode value)
-{
-    if (m_mode != value)
-    {
-        PreviousMode = m_mode;
-        m_mode = value;
-        SetDisplayNormalAlwaysOnTopOption();
-        OnModeChanged();
-        RaisePropertyChanged(ModePropertyName);
-    }
-}
-
-void ApplicationViewModel::Categories::set(IObservableVector<NavCategoryGroup ^> ^ value)
-{
-    if (m_categories != value)
-    {
-        m_categories = value;
-        RaisePropertyChanged(CategoriesPropertyName);
-    }
-}
-
-void ApplicationViewModel::Initialize(ViewMode mode)
-{
-    if (!NavCategoryStates::IsValidViewMode(mode) || !NavCategoryStates::IsViewModeEnabled(mode))
-    {
-        mode = ViewMode::Standard;
-    }
-
-    try
-    {
-        Mode = mode;
-    }
-    catch (const std::exception& e)
-    {
-        TraceLogger::GetInstance()->LogStandardException(mode, __FUNCTIONW__, e);
-        if (!TryRecoverFromNavigationModeFailure())
-        {
-            // Could not navigate to standard mode either.
-            // Throw the original exception so we have a good stack to debug.
-            throw;
-        }
-    }
-    catch (Exception ^ e)
-    {
-        TraceLogger::GetInstance()->LogPlatformException(mode, __FUNCTIONW__, e);
-        if (!TryRecoverFromNavigationModeFailure())
-        {
-            // Could not navigate to standard mode either.
-            // Throw the original exception so we have a good stack to debug.
-            throw;
-        }
-    }
-}
-
-bool ApplicationViewModel::TryRecoverFromNavigationModeFailure()
-{
-    // Here we are simply trying to recover from being unable to navigate to a mode.
-    // Try falling back to standard mode and if there are *any* exceptions, we should
-    // fail because something is seriously wrong.
-    try
-    {
-        Mode = ViewMode::Standard;
-        return true;
-    }
-    catch (...)
-    {
-        return false;
-    }
-}
-
-void ApplicationViewModel::OnModeChanged()
-{
-    assert(NavCategoryStates::IsValidViewMode(m_mode));
-    if (NavCategory::IsCalculatorViewMode(m_mode))
-    {
-        if (!m_CalculatorViewModel)
-        {
-            m_CalculatorViewModel = ref new StandardCalculatorViewModel();
-        }
-        m_CalculatorViewModel->SetCalculatorType(m_mode);
-    }
-    else if (NavCategory::IsGraphingCalculatorViewMode(m_mode))
-    {
-        if (!m_GraphingCalcViewModel)
-        {
-            m_GraphingCalcViewModel = ref new GraphingCalculatorViewModel();
-        }
-    }
-    else if (NavCategory::IsDateCalculatorViewMode(m_mode))
-    {
-        if (!m_DateCalcViewModel)
-        {
-            m_DateCalcViewModel = ref new DateCalculatorViewModel();
-        }
-    }
-    else if (NavCategory::IsConverterViewMode(m_mode))
-    {
-        if (!m_ConverterViewModel)
-        {
-            auto dataLoader = make_shared<UnitConverterDataLoader>(ref new GeographicRegion());
-            auto currencyDataLoader = make_shared<CurrencyDataLoader>(make_unique<CurrencyHttpClient>());
-            m_ConverterViewModel = ref new UnitConverterViewModel(make_shared<UnitConversionManager::UnitConverter>(dataLoader, currencyDataLoader));
-        }
-
-        m_ConverterViewModel->Mode = m_mode;
-    }
-
-    auto resProvider = AppResourceProvider::GetInstance();
-    CategoryName = resProvider->GetResourceString(NavCategoryStates::GetNameResourceKey(m_mode));
-
-    // Cast mode to an int in order to save it to app data.
-    // Save the changed mode, so that the new window launches in this mode.
-    // Don't save until after we have adjusted to the new mode, so we don't save a mode that fails to load.
-    ApplicationData::Current->LocalSettings->Values->Insert(ModePropertyName, NavCategoryStates::Serialize(m_mode));
-
-    // Log ModeChange event when not first launch, log WindowCreated on first launch
-    if (NavCategoryStates::IsValidViewMode(m_PreviousMode))
-    {
-        TraceLogger::GetInstance()->LogModeChange(m_mode);
-    }
-    else
-    {
-        TraceLogger::GetInstance()->LogWindowCreated(m_mode, ApplicationView::GetApplicationViewIdForWindow(CoreWindow::GetForCurrentThread()));
-    }
-
-    RaisePropertyChanged(ClearMemoryVisibilityPropertyName);
-}
-
-void ApplicationViewModel::OnCopyCommand(Object ^ parameter)
-{
-    if (NavCategory::IsConverterViewMode(m_mode))
-    {
-        ConverterViewModel->OnCopyCommand(parameter);
-    }
-    else if (NavCategory::IsDateCalculatorViewMode(m_mode))
-    {
-        DateCalcViewModel->OnCopyCommand(parameter);
-    }
-    else if (NavCategory::IsCalculatorViewMode(m_mode))
-    {
-        CalculatorViewModel->OnCopyCommand(parameter);
-    }
-}
-
-void ApplicationViewModel::OnPasteCommand(Object ^ parameter)
-{
-    if (NavCategory::IsConverterViewMode(m_mode))
-    {
-        ConverterViewModel->OnPasteCommand(parameter);
-    }
-    else if (NavCategory::IsCalculatorViewMode(m_mode))
-    {
-        CalculatorViewModel->OnPasteCommand(parameter);
-    }
-}
-
-void ApplicationViewModel::SetMenuCategories()
-{
-    // Use the Categories property instead of the backing variable
-    // because we want to take advantage of binding updates and
-    // property setter logic.
-    Categories = NavCategoryStates::CreateMenuOptions();
-}
-
-void ApplicationViewModel::ToggleAlwaysOnTop(float width, float height)
-{
-    HandleToggleAlwaysOnTop(width, height);
-}
-
-#pragma optimize("", off)
-task<void> ApplicationViewModel::HandleToggleAlwaysOnTop(float width, float height)
-{
-    if (ApplicationView::GetForCurrentView()->ViewMode == ApplicationViewMode::CompactOverlay)
-    {
-        ApplicationDataContainer ^ localSettings = ApplicationData::Current->LocalSettings;
-        localSettings->Values->Insert(WidthLocalSettings, width);
-        localSettings->Values->Insert(HeightLocalSettings, height);
-
-        bool success = co_await ApplicationView::GetForCurrentView()->TryEnterViewModeAsync(ApplicationViewMode::Default);
-        CalculatorViewModel->HistoryVM->AreHistoryShortcutsEnabled = success;
-        CalculatorViewModel->IsAlwaysOnTop = !success;
-        IsAlwaysOnTop = !success;
-    }
-    else
-    {
-        ApplicationDataContainer ^ localSettings = ApplicationData::Current->LocalSettings;
-        ViewModePreferences ^ compactOptions = ViewModePreferences::CreateDefault(ApplicationViewMode::CompactOverlay);
-        if (!localSettings->Values->GetView()->HasKey(LaunchedLocalSettings))
-        {
-            compactOptions->CustomSize = Size(320, 394);
-            localSettings->Values->Insert(LaunchedLocalSettings, true);
-        }
-        else
-        {
-            if (localSettings->Values->GetView()->HasKey(WidthLocalSettings) && localSettings->Values->GetView()->HasKey(HeightLocalSettings))
-            {
-                float oldWidth = safe_cast<IPropertyValue ^>(localSettings->Values->GetView()->Lookup(WidthLocalSettings))->GetSingle();
-                float oldHeight = safe_cast<IPropertyValue ^>(localSettings->Values->GetView()->Lookup(HeightLocalSettings))->GetSingle();
-                compactOptions->CustomSize = Size(oldWidth, oldHeight);
-            }
-            else
-            {
-                compactOptions->CustomSize = Size(320, 394);
-            }
-        }
-
-        bool success = co_await ApplicationView::GetForCurrentView()->TryEnterViewModeAsync(ApplicationViewMode::CompactOverlay, compactOptions);
-        CalculatorViewModel->HistoryVM->AreHistoryShortcutsEnabled = !success;
-        CalculatorViewModel->IsAlwaysOnTop = success;
-        IsAlwaysOnTop = success;
-    }
-    SetDisplayNormalAlwaysOnTopOption();
-};
-#pragma optimize("", on)
-
-void ApplicationViewModel::SetDisplayNormalAlwaysOnTopOption()
-{
-    DisplayNormalAlwaysOnTopOption =
-        m_mode == ViewMode::Standard && ApplicationView::GetForCurrentView()->IsViewModeSupported(ApplicationViewMode::CompactOverlay) && !IsAlwaysOnTop;
-}
--- a/src/CalcViewModel/ApplicationViewModel.h
+++ b/src/CalcViewModel/ApplicationViewModel.h
@ -1,115 +0,0 @@
-// Copyright (c) Microsoft Corporation. All rights reserved.
-// Licensed under the MIT License.
-
-#pragma once
-
-#include "StandardCalculatorViewModel.h"
-#include "DateCalculatorViewModel.h"
-#include "GraphingCalculator/GraphingCalculatorViewModel.h"
-#include "UnitConverterViewModel.h"
-
-namespace CalculatorApp
-{
-    namespace ViewModelNative
-    {
-        [Windows::UI::Xaml::Data::Bindable] public ref class ApplicationViewModel sealed : public Windows::UI::Xaml::Data::INotifyPropertyChanged
-        {
-        public:
-            ApplicationViewModel();
-
-            void Initialize(CalculatorApp::ViewModelNative::Common::ViewMode mode); // Use for first init, use deserialize for rehydration
-
-            OBSERVABLE_OBJECT();
-            OBSERVABLE_PROPERTY_RW(StandardCalculatorViewModel ^, CalculatorViewModel);
-            OBSERVABLE_PROPERTY_RW(DateCalculatorViewModel ^, DateCalcViewModel);
-            OBSERVABLE_PROPERTY_RW(GraphingCalculatorViewModel ^, GraphingCalcViewModel);
-            OBSERVABLE_PROPERTY_RW(UnitConverterViewModel ^, ConverterViewModel);
-            OBSERVABLE_PROPERTY_RW(CalculatorApp::ViewModelNative::Common::ViewMode, PreviousMode);
-            OBSERVABLE_PROPERTY_R(bool, IsAlwaysOnTop);
-            OBSERVABLE_NAMED_PROPERTY_RW(Platform::String ^, CategoryName);
-
-            // Indicates whether calculator is currently in standard mode _and_ supports CompactOverlay _and_ is not in Always-on-Top mode
-            OBSERVABLE_PROPERTY_R(bool, DisplayNormalAlwaysOnTopOption);
-
-            COMMAND_FOR_METHOD(CopyCommand, ApplicationViewModel::OnCopyCommand);
-            COMMAND_FOR_METHOD(PasteCommand, ApplicationViewModel::OnPasteCommand);
-
-            property CalculatorApp::ViewModelNative::Common::ViewMode Mode
-            {
-                CalculatorApp::ViewModelNative::Common::ViewMode get()
-                {
-                    return m_mode;
-                }
-
-                void set(CalculatorApp::ViewModelNative::Common::ViewMode value);
-            }
-            static property Platform::String^ ModePropertyName
-            {
-                Platform::String^ get()
-                {
-                    return Platform::StringReference(L"Mode");
-                }
-            }
-
-            property Windows::Foundation::Collections::IObservableVector<CalculatorApp::ViewModelNative::Common::NavCategoryGroup^>^ Categories
-            {
-                Windows::Foundation::Collections::IObservableVector<CalculatorApp::ViewModelNative::Common::NavCategoryGroup^>^ get()
-                {
-                    return m_categories;
-                }
-
-                void set(Windows::Foundation::Collections::IObservableVector<CalculatorApp::ViewModelNative::Common::NavCategoryGroup^>^ value);
-            }
-
-            property Windows::UI::Xaml::Visibility ClearMemoryVisibility
-            {
-                Windows::UI::Xaml::Visibility get()
-                {
-                    return CalculatorApp::ViewModelNative::Common::NavCategory::IsCalculatorViewMode(Mode) ? Windows::UI::Xaml::Visibility::Visible
-                                                                                          : Windows::UI::Xaml::Visibility::Collapsed;
-                }
-            }
-
-            static property Platform::String ^ LaunchedLocalSettings
-            {
-                Platform::String ^ get()
-                {
-                    return Platform::StringReference(L"calculatorAlwaysOnTopLaunched");
-                }
-            }
-
-            static property Platform::String ^ WidthLocalSettings
-            {
-                Platform::String ^ get()
-                {
-                    return Platform::StringReference(L"calculatorAlwaysOnTopLastWidth");
-                }
-            }
-
-            static property Platform::String ^ HeightLocalSettings
-            {
-                Platform::String ^ get()
-                {
-                    return Platform::StringReference(L"calculatorAlwaysOnTopLastHeight");
-                }
-            }
-
-            void ToggleAlwaysOnTop(float width, float height);
-
-        private:
-            bool TryRecoverFromNavigationModeFailure();
-
-            void OnModeChanged();
-
-            void OnCopyCommand(Platform::Object ^ parameter);
-            void OnPasteCommand(Platform::Object ^ parameter);
-
-            void SetMenuCategories();
-
-            CalculatorApp::ViewModelNative::Common::ViewMode m_mode;
-            Windows::Foundation::Collections::IObservableVector<CalculatorApp::ViewModelNative::Common::NavCategoryGroup ^> ^ m_categories;
-            Concurrency::task<void> HandleToggleAlwaysOnTop(float width, float height);
-            void SetDisplayNormalAlwaysOnTopOption();
-        };
-    }
-}
--- a/src/CalcViewModel/CalcViewModel.vcxproj
+++ b/src/CalcViewModel/CalcViewModel.vcxproj
@ -298,7 +298,6 @@
    <ResourceCompile Include="CalcViewModel.rc" PreprocessorDefinitions="%(PreprocessorDefinitions);APP_VERSION_MAJOR=$(Version.Split(`.`)[0]);APP_VERSION_MINOR=$(Version.Split(`.`)[1]);APP_VERSION_BUILD=$(Version.Split(`.`)[2]);APP_VERSION_REVISION=$(Version.Split(`.`)[3])" />
  </ItemGroup>
  <ItemGroup>
-    <ClInclude Include="ApplicationViewModel.h" />
    <ClInclude Include="Common\AppResourceProvider.h" />
    <ClInclude Include="Common\Automation\NarratorAnnouncement.h" />
    <ClInclude Include="Common\Automation\NarratorNotifier.h" />
@ -343,7 +342,6 @@
    <ClInclude Include="UnitConverterViewModel.h" />
  </ItemGroup>
  <ItemGroup>
-    <ClCompile Include="ApplicationViewModel.cpp" />
    <ClCompile Include="Common\AppResourceProvider.cpp" />
    <ClCompile Include="Common\Automation\NarratorAnnouncement.cpp" />
    <ClCompile Include="Common\Automation\NarratorNotifier.cpp" />
@ -417,4 +415,4 @@
  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
  <ImportGroup Label="ExtensionTargets">
  </ImportGroup>
-</Project>
+</Project>
--- a/src/CalcViewModel/CalcViewModel.vcxproj.filters
+++ b/src/CalcViewModel/CalcViewModel.vcxproj.filters
@ -82,7 +82,6 @@
    <ClCompile Include="GraphingCalculator\GraphingSettingsViewModel.cpp">
      <Filter>GraphingCalculator</Filter>
    </ClCompile>
-    <ClCompile Include="ApplicationViewModel.cpp" />
    <ClCompile Include="DateCalculatorViewModel.cpp" />
    <ClCompile Include="HistoryItemViewModel.cpp" />
    <ClCompile Include="HistoryViewModel.cpp" />
@ -194,7 +193,6 @@
    <ClInclude Include="GraphingCalculator\VariableViewModel.h">
      <Filter>GraphingCalculator</Filter>
    </ClInclude>
-    <ClInclude Include="ApplicationViewModel.h" />
    <ClInclude Include="DateCalculatorViewModel.h" />
    <ClInclude Include="GraphingCalculatorEnums.h" />
    <ClInclude Include="HistoryItemViewModel.h" />
@ -209,4 +207,7 @@
      <Filter>DataLoaders</Filter>
    </None>
  </ItemGroup>
+  <ItemGroup>
+    <ResourceCompile Include="CalcViewModel.rc" />
+  </ItemGroup>
 </Project>
--- a/src/CalcViewModel/Common/NavCategory.cpp
+++ b/src/CalcViewModel/Common/NavCategory.cpp
@ -322,7 +322,7 @@ void NavCategoryStates::SetCurrentUser(Platform::String^ userId)
    CurrentUserId = userId;
 }

-IObservableVector<NavCategoryGroup ^> ^ NavCategoryStates::CreateMenuOptions()
+IVector<NavCategoryGroup ^> ^ NavCategoryStates::CreateMenuOptions()
 {
    auto menuOptions = ref new Vector<NavCategoryGroup ^>();
    menuOptions->Append(CreateCalculatorCategoryGroup());
--- a/src/CalcViewModel/Common/NavCategory.h
+++ b/src/CalcViewModel/Common/NavCategory.h
@ -153,7 +153,7 @@ namespace CalculatorApp::ViewModelNative
        {
        public:
            static void SetCurrentUser(Platform::String^ user);
-            static Windows::Foundation::Collections::IObservableVector<NavCategoryGroup ^> ^ CreateMenuOptions();
+            static Windows::Foundation::Collections::IVector<NavCategoryGroup ^> ^ CreateMenuOptions();
            static NavCategoryGroup ^ CreateCalculatorCategoryGroup();
            static NavCategoryGroup ^ CreateConverterCategoryGroup();

--- a/src/CalcViewModel/StandardCalculatorViewModel.h
+++ b/src/CalcViewModel/StandardCalculatorViewModel.h
@ -259,11 +259,14 @@ namespace CalculatorApp
            void SwitchAngleType(CalculatorApp::ViewModelNative::Common::NumbersAndOperatorsEnum num);
            void FtoEButtonToggled();

-        internal:
-            void OnPaste(Platform::String ^ pastedString);
+            void SetCalculatorType(CalculatorApp::ViewModelNative::Common::ViewMode targetState);
+
            void OnCopyCommand(Platform::Object ^ parameter);
            void OnPasteCommand(Platform::Object ^ parameter);

+        internal:
+            void OnPaste(Platform::String ^ pastedString);
+
            ButtonInfo MapCharacterToButtonId(char16 ch);

            void OnInputChanged();
@ -277,7 +280,6 @@ namespace CalculatorApp

            Platform::String ^ GetLocalizedStringFormat(Platform::String ^ format, Platform::String ^ displayValue);
            void OnPropertyChanged(Platform::String ^ propertyname);
-            void SetCalculatorType(CalculatorApp::ViewModelNative::Common::ViewMode targetState);

            Platform::String ^ GetRawDisplayValue();
            void Recalculate(bool fromHistory = false);
--- a/src/CalcViewModel/UnitConverterViewModel.cpp
+++ b/src/CalcViewModel/UnitConverterViewModel.cpp
@ -152,6 +152,17 @@ UnitConverterViewModel::UnitConverterViewModel(const shared_ptr<UCM::IUnitConver
    PopulateData();
 }

+UnitConverterViewModel::UnitConverterViewModel()
+    : UnitConverterViewModel(make_shared<UnitConversionManager::UnitConverter>(
+        make_shared<UnitConverterDataLoader>(ref new Windows::Globalization::GeographicRegion()),
+        make_shared<CurrencyDataLoader>(make_unique<CurrencyHttpClient>())))
+{
+}
+
+UnitConverterViewModel::~UnitConverterViewModel()
+{
+}
+
 void UnitConverterViewModel::ResetView()
 {
    m_model->SendCommand(UCM::Command::Reset);
--- a/src/CalcViewModel/UnitConverterViewModel.h
+++ b/src/CalcViewModel/UnitConverterViewModel.h
@ -158,6 +158,9 @@ namespace CalculatorApp
            internal : UnitConverterViewModel(const std::shared_ptr<UnitConversionManager::IUnitConverter>& model);

        public:
+            UnitConverterViewModel();
+            virtual ~UnitConverterViewModel();
+
            OBSERVABLE_OBJECT_CALLBACK(OnPropertyChanged);

            OBSERVABLE_PROPERTY_R(Windows::Foundation::Collections::IObservableVector<Category ^> ^, Categories);
@ -239,14 +242,14 @@ namespace CalculatorApp
            void RefreshCurrencyRatios();
            void OnValueActivated(IActivatable ^ control);

+            void OnCopyCommand(Platform::Object ^ parameter);
+            void OnPasteCommand(Platform::Object ^ parameter);
+
            internal : void ResetView();
            void PopulateData();
            CalculatorApp::ViewModelNative::Common::NumbersAndOperatorsEnum MapCharacterToButtonId(const wchar_t ch, bool& canSendNegate);
            void DisplayPasteError();

-            void OnCopyCommand(Platform::Object ^ parameter);
-            void OnPasteCommand(Platform::Object ^ parameter);
-
            enum class CurrencyFormatterParameter
            {
                Default,
--- a/src/CalcViewModelCopyForUT/CalcViewModelCopyForUT.vcxproj
+++ b/src/CalcViewModelCopyForUT/CalcViewModelCopyForUT.vcxproj
@ -292,7 +292,6 @@
    </ClCompile>
  </ItemDefinitionGroup>
  <ItemGroup>
-    <ClInclude Include="..\CalcViewModel\ApplicationViewModel.h" />
    <ClInclude Include="..\CalcViewModel\Common\AlwaysSelectedCollectionView.h" />
    <ClInclude Include="..\CalcViewModel\Common\AppResourceProvider.h" />
    <ClInclude Include="..\CalcViewModel\Common\Automation\NarratorAnnouncement.h" />
@ -338,7 +337,6 @@
    <ClInclude Include="..\CalcViewModel\UnitConverterViewModel.h" />
  </ItemGroup>
  <ItemGroup>
-    <ClCompile Include="..\CalcViewModel\ApplicationViewModel.cpp" />
    <ClCompile Include="..\CalcViewModel\Common\AppResourceProvider.cpp" />
    <ClCompile Include="..\CalcViewModel\Common\Automation\NarratorAnnouncement.cpp" />
    <ClCompile Include="..\CalcViewModel\Common\Automation\NarratorNotifier.cpp" />
@ -411,4 +409,4 @@
  </ItemGroup>
  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
  <ImportGroup Label="ExtensionTargets" />
-</Project>
+</Project>
--- a/src/CalcViewModelCopyForUT/CalcViewModelCopyForUT.vcxproj.filters
+++ b/src/CalcViewModelCopyForUT/CalcViewModelCopyForUT.vcxproj.filters
@ -24,7 +24,6 @@
    <ClCompile Include="..\CalcViewModel\Common\Automation\NarratorNotifier.cpp">
      <Filter>Common\Automation</Filter>
    </ClCompile>
-    <ClCompile Include="..\CalcViewModel\ApplicationViewModel.cpp" />
    <ClCompile Include="..\CalcViewModel\DateCalculatorViewModel.cpp" />
    <ClCompile Include="..\CalcViewModel\HistoryItemViewModel.cpp" />
    <ClCompile Include="..\CalcViewModel\HistoryViewModel.cpp" />
@ -98,7 +97,6 @@
    <ClInclude Include="..\CalcViewModel\Common\Automation\NarratorNotifier.h">
      <Filter>Common\Automation</Filter>
    </ClInclude>
-    <ClInclude Include="..\CalcViewModel\ApplicationViewModel.h" />
    <ClInclude Include="..\CalcViewModel\DateCalculatorViewModel.h" />
    <ClInclude Include="..\CalcViewModel\HistoryItemViewModel.h" />
    <ClInclude Include="..\CalcViewModel\HistoryViewModel.h" />
--- a/src/Calculator/Common/KeyboardShortcutManager.cs
+++ b/src/Calculator/Common/KeyboardShortcutManager.cs
@ -4,6 +4,7 @@
 using CalculatorApp.ViewModel.Common;
 using CalculatorApp.ViewModelNative;
 using CalculatorApp.ViewModelNative.Common;
+using ApplicationViewModel = CalculatorApp.ViewModel.ApplicationViewModel;
 using Utilities = CalculatorApp.ViewModel.Common.Utilities;

 using System;
--- a/src/Calculator/Views/MainPage.xaml.cs
+++ b/src/Calculator/Views/MainPage.xaml.cs
@ -3,6 +3,7 @@ using CalculatorApp.Converters;
 using CalculatorApp.ViewModelNative;
 using CalculatorApp.ViewModelNative.Common;
 using CalculatorApp.ViewModelNative.Common.Automation;
+using ApplicationViewModel = CalculatorApp.ViewModel.ApplicationViewModel;

 using System;
 using System.Collections.Generic;
@ -131,9 +132,9 @@ namespace CalculatorApp
            else
            {
                ApplicationDataContainer localSettings = ApplicationData.Current.LocalSettings;
-                if (localSettings.Values.ContainsKey(ApplicationViewModel.ModePropertyName))
+                if (localSettings.Values.ContainsKey(ApplicationViewModel.ModeLocalSettings))
                {
-                    initialMode = NavCategoryStates.Deserialize(localSettings.Values[ApplicationViewModel.ModePropertyName]);
+                    initialMode = NavCategoryStates.Deserialize(localSettings.Values[ApplicationViewModel.ModeLocalSettings]);
                }
            }

@ -143,11 +144,6 @@ namespace CalculatorApp
        private void InitializeNavViewCategoriesSource()
        {
            NavViewCategoriesSource = ExpandNavViewCategoryGroups(Model.Categories);
-            Model.Categories.VectorChanged += (sender, args) =>
-            {
-                NavViewCategoriesSource.Clear();
-                NavViewCategoriesSource = ExpandNavViewCategoryGroups(Model.Categories);
-            };

            _ = Window.Current.Dispatcher.RunAsync(CoreDispatcherPriority.Low, () =>
            {
@ -199,7 +195,7 @@ namespace CalculatorApp
        private void OnAppPropertyChanged(object sender, PropertyChangedEventArgs e)
        {
            string propertyName = e.PropertyName;
-            if (propertyName == ApplicationViewModel.ModePropertyName)
+            if (propertyName == nameof(ApplicationViewModel.Mode))
            {
                ViewMode newValue = Model.Mode;
                ViewMode previousMode = Model.PreviousMode;
@ -265,7 +261,7 @@ namespace CalculatorApp
                UpdateViewState();
                SetDefaultFocus();
            }
-            else if (propertyName == ApplicationViewModel.CategoryNamePropertyName)
+            else if (propertyName == nameof(ApplicationViewModel.CategoryName))
            {
                SetHeaderAutomationName();
                AnnounceCategoryName();
--- a/src/CalculatorApp.ViewModel/ApplicationViewModel.cs
+++ b/src/CalculatorApp.ViewModel/ApplicationViewModel.cs
@ -0,0 +1,323 @@
+// Copyright (c) Microsoft Corporation. All rights reserved.
+// Licensed under the MIT License.
+
+using CalculatorApp.ViewModelNative;
+using CalculatorApp.ViewModelNative.Common;
+using System;
+using System.Collections.Generic;
+using System.ComponentModel;
+using System.Diagnostics;
+using System.Linq;
+using System.Runtime.CompilerServices;
+using System.Windows.Input;
+using Windows.Foundation;
+using Windows.Storage;
+using Windows.UI.Core;
+using Windows.UI.ViewManagement;
+using Windows.UI.Xaml;
+
+namespace CalculatorApp.ViewModel
+{
+    public class ApplicationViewModel : INotifyPropertyChanged
+    {
+        private class CommandWrapper : ICommand
+        {
+            private readonly Action action;
+
+            public CommandWrapper(Action action)
+            {
+                this.action = action;
+            }
+
+            public event EventHandler CanExecuteChanged
+            {
+                add { }
+                remove { }
+            }
+
+            public bool CanExecute(object parameter)
+            {
+                return true;
+            }
+
+            public void Execute(object parameter)
+            {
+                this.action();
+            }
+        }
+
+        public const string ModeLocalSettings = "Mode";
+        public const string AlwaysOnTopLaunchedLocalSettings = "calculatorAlwaysOnTopLaunched";
+        public const string WidthLocalSettings = "calculatorAlwaysOnTopLastWidth";
+        public const string HeightLocalSettings = "calculatorAlwaysOnTopLastHeight";
+
+        public StandardCalculatorViewModel CalculatorViewModel { get; private set; }
+        public GraphingCalculatorViewModel GraphingCalcViewModel { get; private set; }
+        public DateCalculatorViewModel DateCalcViewModel { get; private set; }
+        public UnitConverterViewModel ConverterViewModel { get; private set; }
+
+        public event PropertyChangedEventHandler PropertyChanged;
+
+        private ViewMode mode = ViewMode.None;
+        public ViewMode Mode
+        {
+            get => this.mode;
+            set
+            {
+                if (this.mode != value)
+                {
+                    this.PreviousMode = this.mode;
+                    this.mode = value;
+                    SetDisplayNormalAlwaysOnTopOption();
+                    OnModeChanged();
+                    RaisePropertyChanged();
+                }
+            }
+        }
+
+        private ViewMode previousMode = ViewMode.None;
+        public ViewMode PreviousMode
+        {
+            get => this.previousMode;
+            set
+            {
+                if (this.previousMode != value)
+                {
+                    this.previousMode = value;
+                    RaisePropertyChanged();
+                }
+            }
+        }
+
+        public IList<NavCategoryGroup> Categories => NavCategoryStates.CreateMenuOptions();
+
+        private string categoryName;
+        public string CategoryName
+        {
+            get => this.categoryName;
+            private set
+            {
+                if (this.categoryName != value)
+                {
+                    this.categoryName = value;
+                    RaisePropertyChanged();
+                }
+            }
+        }
+
+        public Visibility ClearMemoryVisibility
+        {
+            get => NavCategory.IsCalculatorViewMode(Mode) ? Visibility.Visible : Visibility.Collapsed;
+        }
+
+        private bool isAlwaysOnTop;
+        public bool IsAlwaysOnTop
+        {
+            get => this.isAlwaysOnTop;
+            private set
+            {
+                if (this.isAlwaysOnTop != value)
+                {
+                    this.isAlwaysOnTop = value;
+                    RaisePropertyChanged();
+                }
+            }
+        }
+
+        private bool displayNormalAlwaysOnTopOption;
+        // Indicates whether calculator is currently in standard mode _and_ supports CompactOverlay _and_ is not in Always-on-Top mode
+        public bool DisplayNormalAlwaysOnTopOption
+        {
+            get => this.displayNormalAlwaysOnTopOption;
+            private set
+            {
+                if (this.displayNormalAlwaysOnTopOption != value)
+                {
+                    this.displayNormalAlwaysOnTopOption = value;
+                    RaisePropertyChanged();
+                }
+            }
+        }
+
+        public void Initialize(ViewMode mode)
+        {
+            if (!NavCategoryStates.IsValidViewMode(mode) || !NavCategoryStates.IsViewModeEnabled(mode))
+            {
+                mode = ViewMode.Standard;
+            }
+
+            try
+            {
+                this.Mode = mode;
+            }
+            catch (Exception e)
+            {
+                TraceLogger.GetInstance().LogError(mode, "ApplicationViewModel::Initialize", e.Message);
+                if (!TryRecoverFromNavigationModeFailure())
+                {
+                    // Could not navigate to standard mode either.
+                    // Throw the original exception so we have a good stack to debug.
+                    throw;
+                }
+            }
+        }
+
+        public ICommand CopyCommand => new CommandWrapper(this.Copy);
+        public ICommand PasteCommand => new CommandWrapper(this.Paste);
+
+        public void Copy()
+        {
+            if (NavCategory.IsConverterViewMode(this.mode))
+            {
+                ConverterViewModel.OnCopyCommand(null);
+            }
+            else if (NavCategory.IsDateCalculatorViewMode(this.mode))
+            {
+                DateCalcViewModel.OnCopyCommand(null);
+            }
+            else if (NavCategory.IsCalculatorViewMode(this.mode))
+            {
+                CalculatorViewModel.OnCopyCommand(null);
+            }
+        }
+
+        public void Paste()
+        {
+            if (NavCategory.IsConverterViewMode(this.mode))
+            {
+                ConverterViewModel.OnPasteCommand(null);
+            }
+            else if (NavCategory.IsCalculatorViewMode(this.mode))
+            {
+                CalculatorViewModel.OnPasteCommand(null);
+            }
+        }
+
+        public async void ToggleAlwaysOnTop(float width, float height)
+        {
+            if (ApplicationView.GetForCurrentView().ViewMode == ApplicationViewMode.CompactOverlay)
+            {
+                ApplicationDataContainer localSettings = ApplicationData.Current.LocalSettings;
+                localSettings.Values[WidthLocalSettings] = width;
+                localSettings.Values[HeightLocalSettings] = height;
+
+                bool success = await ApplicationView.GetForCurrentView().TryEnterViewModeAsync(ApplicationViewMode.Default);
+                CalculatorViewModel.HistoryVM.AreHistoryShortcutsEnabled = success;
+                CalculatorViewModel.IsAlwaysOnTop = !success;
+                this.IsAlwaysOnTop = !success;
+            }
+            else
+            {
+                ApplicationDataContainer localSettings = ApplicationData.Current.LocalSettings;
+                ViewModePreferences compactOptions = ViewModePreferences.CreateDefault(ApplicationViewMode.CompactOverlay);
+                if (!localSettings.Values.ContainsKey(AlwaysOnTopLaunchedLocalSettings))
+                {
+                    compactOptions.CustomSize = new Size(320, 394);
+                    localSettings.Values[AlwaysOnTopLaunchedLocalSettings] = true;
+                }
+                else
+                {
+                    if (localSettings.Values.TryGetValue(WidthLocalSettings, out object widthSetting) && localSettings.Values.TryGetValue(HeightLocalSettings, out object heightSetting))
+                    {
+                        float oldWidth = (float)widthSetting;
+                        float oldHeight = (float)heightSetting;
+                        compactOptions.CustomSize = new Size(oldWidth, oldHeight);
+                    }
+                    else
+                    {
+                        compactOptions.CustomSize = new Size(320, 394);
+                    }
+                }
+
+                bool success = await ApplicationView.GetForCurrentView().TryEnterViewModeAsync(ApplicationViewMode.CompactOverlay, compactOptions);
+                CalculatorViewModel.HistoryVM.AreHistoryShortcutsEnabled = !success;
+                CalculatorViewModel.IsAlwaysOnTop = success;
+                this.IsAlwaysOnTop = success;
+            }
+            SetDisplayNormalAlwaysOnTopOption();
+        }
+
+        private void OnModeChanged()
+        {
+            Debug.Assert(NavCategoryStates.IsValidViewMode(this.mode));
+            if (NavCategory.IsCalculatorViewMode(this.mode))
+            {
+                if (this.CalculatorViewModel is null)
+                {
+                    this.CalculatorViewModel = new StandardCalculatorViewModel();
+                }
+                this.CalculatorViewModel.SetCalculatorType(this.mode);
+            }
+            else if (NavCategory.IsGraphingCalculatorViewMode(this.mode))
+            {
+                if (this.GraphingCalcViewModel is null)
+                {
+                    this.GraphingCalcViewModel = new GraphingCalculatorViewModel();
+                }
+            }
+            else if (NavCategory.IsDateCalculatorViewMode(this.mode))
+            {
+                if (this.DateCalcViewModel is null)
+                {
+                    this.DateCalcViewModel = new DateCalculatorViewModel();
+                }
+            }
+            else if (NavCategory.IsConverterViewMode(this.mode))
+            {
+                if (this.ConverterViewModel is null)
+                {
+                    this.ConverterViewModel = new UnitConverterViewModel();
+                }
+
+                this.ConverterViewModel.Mode = this.mode;
+            }
+
+            var resProvider = AppResourceProvider.GetInstance();
+            this.CategoryName = resProvider.GetResourceString(NavCategoryStates.GetNameResourceKey(this.mode));
+
+            // Cast mode to an int in order to save it to app data.
+            // Save the changed mode, so that the new window launches in this mode.
+            // Don't save until after we have adjusted to the new mode, so we don't save a mode that fails to load.
+            ApplicationData.Current.LocalSettings.Values[ModeLocalSettings] = NavCategoryStates.Serialize(this.mode);
+
+            // Log ModeChange event when not first launch, log WindowCreated on first launch
+            if (NavCategoryStates.IsValidViewMode(this.PreviousMode))
+            {
+                TraceLogger.GetInstance().LogModeChange(this.mode);
+            }
+            else
+            {
+                TraceLogger.GetInstance().LogWindowCreated(this.mode, ApplicationView.GetApplicationViewIdForWindow(CoreWindow.GetForCurrentThread()));
+            }
+
+            RaisePropertyChanged(nameof(this.ClearMemoryVisibility));
+        }
+
+        private bool TryRecoverFromNavigationModeFailure()
+        {
+            // Here we are simply trying to recover from being unable to navigate to a mode.
+            // Try falling back to standard mode and if there are *any* exceptions, we should
+            // fail because something is seriously wrong.
+            try
+            {
+                this.Mode = ViewMode.Standard;
+                return true;
+            }
+            catch
+            {
+                return false;
+            }
+        }
+
+        private void SetDisplayNormalAlwaysOnTopOption()
+        {
+            this.DisplayNormalAlwaysOnTopOption =
+                this.mode == ViewMode.Standard && ApplicationView.GetForCurrentView().IsViewModeSupported(ApplicationViewMode.CompactOverlay) && !this.IsAlwaysOnTop;
+        }
+
+        private void RaisePropertyChanged([CallerMemberName] string propertyName = null)
+        {
+            this.PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
+        }
+    }
+}
--- a/src/CalculatorApp.ViewModel/CalculatorApp.ViewModel.csproj
+++ b/src/CalculatorApp.ViewModel/CalculatorApp.ViewModel.csproj
@ -1,4 +1,4 @@
-<?xml version="1.0" encoding="utf-8"?>
+<?xml version="1.0" encoding="utf-8"?>
 <Project ToolsVersion="15.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
  <PropertyGroup>
@ -101,6 +101,7 @@
    <RestoreProjectStyle>PackageReference</RestoreProjectStyle>
  </PropertyGroup>
  <ItemGroup>
+    <Compile Include="ApplicationViewModel.cs" />
    <Compile Include="Common\Utilities.cs" />
    <Compile Include="Properties\AssemblyInfo.cs" />
    <EmbeddedResource Include="Properties\Calculator.ViewModel.rd.xml" />
@ -131,4 +132,4 @@
  <Target Name="AfterBuild">
  </Target>
  -->
-</Project>
+</Project>
--- a/src/CalculatorUnitTests/NavCategoryUnitTests.cpp
+++ b/src/CalculatorUnitTests/NavCategoryUnitTests.cpp
@ -98,7 +98,7 @@ namespace CalculatorUnitTests
    public:
        TEST_METHOD(CreateNavCategoryGroup)
        {
-            IObservableVector<NavCategoryGroup ^> ^ menuOptions = NavCategoryStates::CreateMenuOptions();
+            IVector<NavCategoryGroup ^> ^ menuOptions = NavCategoryStates::CreateMenuOptions();

            VERIFY_ARE_EQUAL(2, menuOptions->Size);