calculator/src/Calculator/Views/Calculator.xaml.cpp

// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.

#include "pch.h"
#include "Calculator.xaml.h"
#include "CalculatorStandardOperators.xaml.h"
#include "CalcViewModel/Common/TraceLogger.h"
#include "CalcViewModel/Common/CopyPasteManager.h"
#include "CalcViewModel/StandardCalculatorViewModel.h"
#include "CalcViewModel/Common/LocalizationSettings.h"
#include "Memory.xaml.h"
#include "HistoryList.xaml.h"

using namespace CalculatorApp;
using namespace CalculatorApp::Common;
using namespace CalculatorApp::Converters;
using namespace CalculatorApp::Controls;
using namespace CalculatorApp::ViewModel;

using namespace Concurrency;
using namespace Platform;
using namespace Windows::Foundation;
using namespace Windows::Foundation::Collections;
using namespace Windows::Globalization::NumberFormatting;
using namespace Windows::System;
using namespace Windows::UI::Core;
using namespace Windows::UI::Xaml;
using namespace Windows::UI::Xaml::Automation;
using namespace Windows::UI::Xaml::Automation::Peers;
using namespace Windows::UI::Xaml::Controls;
using namespace Windows::UI::Xaml::Controls::Primitives;
using namespace Windows::UI::Xaml::Data;
using namespace Windows::UI::Xaml::Input;
using namespace Windows::UI::Xaml::Media;
using namespace Windows::UI::Xaml::Navigation;
using namespace Windows::System::Threading;
using namespace Windows::UI::ViewManagement;

DEPENDENCY_PROPERTY_INITIALIZATION(Calculator, IsStandard);
DEPENDENCY_PROPERTY_INITIALIZATION(Calculator, IsScientific);
DEPENDENCY_PROPERTY_INITIALIZATION(Calculator, IsProgrammer);
DEPENDENCY_PROPERTY_INITIALIZATION(Calculator, IsAlwaysOnTop);

Calculator::Calculator()
    : m_doAnimate(false)
    , m_isLastAnimatedInScientific(false)
    , m_isLastAnimatedInProgrammer(false)
    , m_resultAnimate(false)
{
    SetFontSizeResources();
    InitializeComponent();
    LoadResourceStrings();

    if (LocalizationService::GetInstance()->IsRtlLayout())
    {
        HistoryButton->HorizontalAlignment = ::HorizontalAlignment::Left;
    }

    m_displayFlyout = static_cast<MenuFlyout ^>(Resources->Lookup(L"DisplayContextMenu"));
    auto resLoader = AppResourceProvider::GetInstance();
    CopyMenuItem->Text = resLoader->GetResourceString(L"copyMenuItem");
    PasteMenuItem->Text = resLoader->GetResourceString(L"pasteMenuItem");

    this->SizeChanged += ref new SizeChangedEventHandler(this, &Calculator::Calculator_SizeChanged);
}

void Calculator::LoadResourceStrings()
{
    auto resProvider = AppResourceProvider::GetInstance();
    m_openMemoryFlyoutAutomationName = resProvider->GetResourceString(L"MemoryButton_Open");
    m_closeMemoryFlyoutAutomationName = resProvider->GetResourceString(L"MemoryButton_Close");
    m_openHistoryFlyoutAutomationName = resProvider->GetResourceString(L"HistoryButton_Open");
    m_closeHistoryFlyoutAutomationName = resProvider->GetResourceString(L"HistoryButton_Close");
    AutomationProperties::SetName(MemoryButton, m_openMemoryFlyoutAutomationName);
    AutomationProperties::SetName(HistoryButton, m_openHistoryFlyoutAutomationName);
}

void Calculator::InitializeHistoryView(_In_ HistoryViewModel ^ historyVM)
{
    if (m_historyList == nullptr)
    {
        m_historyList = ref new HistoryList();
        m_historyList->DataContext = historyVM;
        historyVM->HideHistoryClicked += ref new ViewModel::HideHistoryClickedHandler(this, &Calculator::OnHideHistoryClicked);
        historyVM->HistoryItemClicked += ref new ViewModel::HistoryItemClickedHandler(this, &Calculator::OnHistoryItemClicked);
    }
}

void Calculator::SetFontSizeResources()
{
    // Since we need different font sizes for different numeric system,
    // we use a table of optimal font sizes for each numeric system.
    static const FontTable fontTables[] = {
        { L"Arab", 104, 29.333, 23, 40, 56, 40, 56 },   { L"ArabExt", 104, 29.333, 23, 40, 56, 40, 56 }, { L"Beng", 104, 26, 17, 40, 56, 40, 56 },
        { L"Deva", 104, 29.333, 20.5, 40, 56, 40, 56 }, { L"Gujr", 104, 29.333, 18.5, 40, 56, 40, 56 },  { L"Khmr", 104, 29.333, 19.5, 40, 56, 40, 56 },
        { L"Knda", 104, 25, 17, 40, 56, 40, 56 },       { L"Laoo", 104, 28, 18, 40, 56, 40, 56 },        { L"Latn", 104, 29.333, 23, 40, 56, 40, 56 },
        { L"Mlym", 80, 22, 15.5, 30, 56, 35, 48 },      { L"Mymr", 104, 29.333, 20, 35, 48, 36, 48 },    { L"Orya", 88, 26, 20, 40, 56, 40, 56 },
        { L"TamlDec", 77, 25, 16, 28, 48, 34, 48 },     { L"Telu", 104, 25, 16.5, 40, 56, 40, 56 },      { L"Thai", 104, 28, 18, 40, 56, 40, 56 },
        { L"Tibt", 104, 29.333, 20, 40, 56, 40, 56 },   { L"Default", 104, 29.333, 23, 40, 56, 40, 56 }
    };

    DecimalFormatter ^ formatter = LocalizationService::GetInstance()->GetRegionalSettingsAwareDecimalFormatter();

    const FontTable* currentItem = fontTables;
    while (currentItem->numericSystem.compare(std::wstring(L"Default")) != 0 && currentItem->numericSystem.compare(formatter->NumeralSystem->Data()) != 0)
    {
        currentItem++;
    }

    this->Resources->Insert(StringReference(L"ResultFullFontSize"), currentItem->fullFont);
    this->Resources->Insert(StringReference(L"ResultFullMinFontSize"), currentItem->fullFontMin);
    this->Resources->Insert(StringReference(L"ResultPortraitMinFontSize"), currentItem->portraitMin);
    this->Resources->Insert(StringReference(L"ResultSnapFontSize"), currentItem->snapFont);
    this->Resources->Insert(StringReference(L"CalcButtonCaptionSizeOverride"), currentItem->fullNumPadFont);
    this->Resources->Insert(StringReference(L"CalcButtonScientificSnapCaptionSizeOverride"), currentItem->snapScientificNumPadFont);
    this->Resources->Insert(StringReference(L"CalcButtonScientificPortraitCaptionSizeOverride"), currentItem->portraitScientificNumPadFont);
}

void Calculator::OnLoaded(_In_ Object ^, _In_ RoutedEventArgs ^)
{
    Model->PropertyChanged += ref new PropertyChangedEventHandler(this, &Calculator::OnCalcPropertyChanged);
    Model->HideMemoryClicked += ref new HideMemoryClickedHandler(this, &Calculator::OnHideMemoryClicked);

    InitializeHistoryView(Model->HistoryVM);
    String ^ historyPaneName = AppResourceProvider::GetInstance()->GetResourceString(L"HistoryPane");
    HistoryFlyout->FlyoutPresenterStyle->Setters->Append(ref new Setter(AutomationProperties::NameProperty, historyPaneName));
    String ^ memoryPaneName = AppResourceProvider::GetInstance()->GetResourceString(L"MemoryPane");
    MemoryFlyout->FlyoutPresenterStyle->Setters->Append(ref new Setter(AutomationProperties::NameProperty, memoryPaneName));

    if (Windows::Foundation::Metadata::ApiInformation::IsEventPresent(L"Windows.UI.Xaml.Controls.Primitives.FlyoutBase", L"Closing"))
    {
        HistoryFlyout->Closing += ref new TypedEventHandler<FlyoutBase ^, FlyoutBaseClosingEventArgs ^>(this, &Calculator::HistoryFlyout_Closing);
        MemoryFlyout->Closing += ref new TypedEventHandler<FlyoutBase ^, FlyoutBaseClosingEventArgs ^>(this, &Calculator::OnMemoryFlyoutClosing);
    }

    // Delay load things later when we get a chance.
    WeakReference weakThis(this);
    this->Dispatcher->RunAsync(
        CoreDispatcherPriority::Normal, ref new DispatchedHandler([weakThis]() {
            if (TraceLogger::GetInstance()->IsWindowIdInLog(ApplicationView::GetApplicationViewIdForWindow(CoreWindow::GetForCurrentThread())))
            {
                auto refThis = weakThis.Resolve<Calculator>();
                if (refThis != nullptr)
                {
                    refThis->GetMemory();
                }
            }
        }));
}

Platform::String ^ Calculator::GetCurrentLayoutState()
{
    if (IsProgrammer)
    {
        return L"Programmer";
    }
    else if (IsScientific)
    {
        return L"Scientific";
    }
    else
    {
        return L"Standard";
    }
}

void Calculator::UpdateViewState()
{
    std::wstring state;
    if (IsProgrammer)
    {
        state = L"Programmer";
        Model->IsDecimalEnabled = false;
        ResultsMVisualStateTrigger->MinWindowHeight = 640;
    }
    else if (IsScientific)
    {
        state = L"Scientific";
        Model->IsDecimalEnabled = true;
        ResultsMVisualStateTrigger->MinWindowHeight = 544;
    }
    else
    {
        state = L"Standard";
        Model->IsDecimalEnabled = true;
        ResultsMVisualStateTrigger->MinWindowHeight = 1;
    }

    CloseHistoryFlyout();
    CloseMemoryFlyout();

    VisualStateManager::GoToState(this, ref new String(state.c_str()), true /*useTransitions*/);
}

void Calculator::AnimateCalculator(bool resultAnimate)
{
    static auto uiSettings = ref new UISettings();
    if (uiSettings->AnimationsEnabled)
    {
        m_doAnimate = true;
        m_resultAnimate = resultAnimate;
        if (((m_isLastAnimatedInScientific && IsScientific) || (!m_isLastAnimatedInScientific && !IsScientific))
            && ((m_isLastAnimatedInProgrammer && IsProgrammer) || (!m_isLastAnimatedInProgrammer && !IsProgrammer)))
        {
            // We are forcing the animation here
            // It's because if last animation was in standard, then go to unit converter, then comes back to standard
            // The state for the calculator does not change and the animation would not get run.
            this->OnModeVisualStateCompleted(nullptr, nullptr);
        }
    }
}

void Calculator::OnContextRequested(UIElement ^ sender, ContextRequestedEventArgs ^ e)
{
    auto requestedElement = safe_cast<FrameworkElement ^>(e->OriginalSource);

    PasteMenuItem->IsEnabled = CopyPasteManager::HasStringToPaste();

    Point point;
    if (e->TryGetPosition(requestedElement, &point))
    {
        m_displayFlyout->ShowAt(requestedElement, point);
    }
    else
    {
        // Not invoked via pointer, so let XAML choose a default location.
        m_displayFlyout->ShowAt(requestedElement);
    }

    e->Handled = true;
}

void Calculator::OnContextCanceled(UIElement ^ sender, RoutedEventArgs ^ e)
{
    m_displayFlyout->Hide();
}

void Calculator::OnLayoutVisualStateCompleted(_In_ Object ^ sender, _In_ Object ^ e)
{
    UpdatePanelViewState();
}

void Calculator::OnIsStandardPropertyChanged(bool /*oldValue*/, bool /*newValue*/)
{
    UpdateViewState();
    UpdatePanelViewState();
}

void Calculator::OnIsScientificPropertyChanged(bool /*oldValue*/, bool newValue)
{
    if (newValue)
    {
        EnsureScientific();
    }

    UpdateViewState();
    UpdatePanelViewState();
}

void Calculator::OnIsProgrammerPropertyChanged(bool /*oldValue*/, bool newValue)
{
    if (newValue)
    {
        EnsureProgrammer();
        m_pivotItem = static_cast<Windows::UI::Xaml::Controls::PivotItem ^>(DockPivot->Items->GetAt(0));
        DockPivot->Items->RemoveAt(0);
    }
    else
    {
        if (m_pivotItem != nullptr && DockPivot->Items->Size == 1)
        {
            DockPivot->Items->InsertAt(0, m_pivotItem);
        }
    }

    DockPivot->SelectedIndex = 0;
    UpdateViewState();
    UpdatePanelViewState();
}

void Calculator::OnIsAlwaysOnTopPropertyChanged(bool /*oldValue*/, bool newValue)
{
    if (newValue)
    {
        VisualStateManager::GoToState(this, L"DisplayModeAlwaysOnTop", false);
        AlwaysOnTopResults->UpdateScrollButtons();
    }
    else
    {
        VisualStateManager::GoToState(this, L"DisplayModeNormal", false);
        if (!Model->IsInError)
        {
            EnableMemoryControls(true);
        }
        Results->UpdateTextState();
    }

    Model->IsMemoryEmpty = (Model->MemorizedNumbers->Size == 0) || IsAlwaysOnTop;

    UpdateViewState();
    UpdatePanelViewState();
}

void Calculator::OnIsInErrorPropertyChanged()
{
    bool isError = Model->IsInError;

    String ^ newState = isError ? L"ErrorLayout" : L"NoErrorLayout";
    VisualStateManager::GoToState(this, newState, false);

    if (m_memory != nullptr)
    {
        m_memory->IsErrorVisualState = isError;
    }

    OpsPanel->IsErrorVisualState = isError;
    if (IsScientific && ScientificAngleButtons)
    {
        ScientificAngleButtons->IsErrorVisualState = isError;
    }
    else if (IsProgrammer && ProgrammerDisplayPanel)
    {
        ProgrammerDisplayPanel->IsErrorVisualState = isError;
    }
}

// Once the storyboard that rearranges the buttons completed,
// We do the animation based on the Mode or Orientation change.
void Calculator::OnModeVisualStateCompleted(_In_ Object ^ sender, _In_ Object ^ e)
{
    m_isLastAnimatedInScientific = IsScientific;
    m_isLastAnimatedInProgrammer = IsProgrammer;
    if (m_doAnimate)
    {
        m_doAnimate = false;
        if (m_resultAnimate)
        {
            m_resultAnimate = false;
            Animate->Begin();
        }
        else
        {
            AnimateWithoutResult->Begin();
        }
    }
}

void Calculator::EnsureScientific()
{
    OpsPanel->EnsureScientificOps();

    if (!ScientificAngleButtons)
    {
        this->FindName(L"ScientificAngleButtons");
    }
}

void Calculator::EnsureProgrammer()
{
    if (!ProgrammerOperators)
    {
        this->FindName(L"ProgrammerOperators");
    }

    if (!ProgrammerDisplayPanel)
    {
        this->FindName(L"ProgrammerDisplayPanel");
    }

    OpsPanel->EnsureProgrammerRadixOps();
    ProgrammerOperators->SetRadixButton(Model->CurrentRadixType);
}

void Calculator::OnCalcPropertyChanged(_In_ Object ^ sender, _In_ PropertyChangedEventArgs ^ e)
{
    String ^ prop = e->PropertyName;
    if (prop == StandardCalculatorViewModel::IsMemoryEmptyPropertyName)
    {
        UpdateMemoryState();
    }
    else if (prop == StandardCalculatorViewModel::IsInErrorPropertyName)
    {
        OnIsInErrorPropertyChanged();
    }
}

void Calculator::UpdatePanelViewState()
{
    UpdateHistoryState();
    UpdateMemoryState();
}

void Calculator::UpdateHistoryState()
{
    if (DockPanel->Visibility == ::Visibility::Visible)
    {
        // docked view
        CloseHistoryFlyout();
        SetChildAsHistory();

        if (!IsProgrammer && m_IsLastFlyoutHistory)
        {
            DockPivot->SelectedIndex = 0;
        }
    }
    else
    {
        // flyout view
        DockHistoryHolder->Child = nullptr;
    }
}

void Calculator::UpdateMemoryState()
{
    if (!IsAlwaysOnTop)
    {
        if (!Model->IsMemoryEmpty)
        {
            MemRecall->IsEnabled = true;
            ClearMemoryButton->IsEnabled = true;
        }
        else
        {
            MemRecall->IsEnabled = false;
            ClearMemoryButton->IsEnabled = false;
        }

        if (DockPanel->Visibility == ::Visibility::Visible)
        {
            CloseMemoryFlyout();
            SetChildAsMemory();
            MemoryButton->Visibility = ::Visibility::Collapsed;

            if (m_IsLastFlyoutMemory && !IsProgrammer)
            {
                DockPivot->SelectedIndex = 1;
            }
        }
        else
        {
            MemoryButton->Visibility = ::Visibility::Visible;
            DockMemoryHolder->Child = nullptr;
        }
    }
}

void Calculator::SetChildAsMemory()
{
    DockMemoryHolder->Child = GetMemory();
}

void Calculator::SetChildAsHistory()
{
    if (m_historyList == nullptr)
    {
        InitializeHistoryView(Model->HistoryVM);
    }

    DockHistoryHolder->Child = m_historyList;
}

void Calculator::OnHideHistoryClicked()
{
    ToggleHistoryFlyout(nullptr);
}

void Calculator::OnHistoryItemClicked(_In_ HistoryItemViewModel ^ e)
{
    Model->SelectHistoryItem(e);

    CloseHistoryFlyout();
    this->Focus(::FocusState::Programmatic);
}

void Calculator::HistoryFlyout_Opened(_In_ Object ^ sender, _In_ Object ^ args)
{
    m_fIsHistoryFlyoutOpen = true;
    m_IsLastFlyoutMemory = false;
    m_IsLastFlyoutHistory = true;
    EnableControls(false);
    AutomationProperties::SetName(HistoryButton, m_closeHistoryFlyoutAutomationName);
}

void Calculator::HistoryFlyout_Closing(_In_ FlyoutBase ^ sender, _In_ FlyoutBaseClosingEventArgs ^ args)
{
    // Set in the Closing event so the new name is available when the Flyout has Closed.
    AutomationProperties::SetName(HistoryButton, m_openHistoryFlyoutAutomationName);
}

void Calculator::HistoryFlyout_Closed(_In_ Object ^ sender, _In_ Object ^ args)
{
    // Ideally, this would be renamed in the Closing event because the Closed event is too late.
    // Closing is not available until RS1+ so we set the name again here for TH2 support.
    AutomationProperties::SetName(HistoryButton, m_openHistoryFlyoutAutomationName);
    m_fIsHistoryFlyoutOpen = false;
    EnableControls(true);
    if (HistoryButton->IsEnabled && HistoryButton->Visibility == ::Visibility::Visible)
    {
        HistoryButton->Focus(::FocusState::Programmatic);
    }

    FullscreenFlyoutClosed();
}

void Calculator::CloseHistoryFlyout()
{
    if (m_fIsHistoryFlyoutOpen)
    {
        HistoryFlyout->Hide();
    }
}

void Calculator::CloseMemoryFlyout()
{
    if (m_fIsMemoryFlyoutOpen)
    {
        MemoryFlyout->Hide();
    }
}

void Calculator::SetDefaultFocus()
{
    if (!IsAlwaysOnTop)
    {
        Results->Focus(::FocusState::Programmatic);
    }
    else
    {
        AlwaysOnTopResults->Focus(::FocusState::Programmatic);
    }
}

void Calculator::ToggleHistoryFlyout(Object ^ /*parameter*/)
{
    if (Model->IsProgrammer || DockPanel->Visibility == ::Visibility::Visible)
    {
        return;
    }

    if (m_fIsHistoryFlyoutOpen)
    {
        HistoryFlyout->Hide();
    }
    else
    {
        HistoryFlyout->Content = m_historyList;
        m_historyList->RowHeight = NumpadPanel->ActualHeight;
        FlyoutBase::ShowAttachedFlyout(HistoryButton);
    }
}

void Calculator::ToggleMemoryFlyout()
{
    if (DockPanel->Visibility == ::Visibility::Visible)
    {
        return;
    }

    if (m_fIsMemoryFlyoutOpen)
    {
        MemoryFlyout->Hide();
    }
    else
    {
        MemoryFlyout->Content = GetMemory();
        m_memory->RowHeight = NumpadPanel->ActualHeight;
        FlyoutBase::ShowAttachedFlyout(MemoryButton);
    }
}

void Calculator::OnMemoryFlyoutOpened(_In_ Object ^ sender, _In_ Object ^ args)
{
    m_IsLastFlyoutMemory = true;
    m_IsLastFlyoutHistory = false;
    m_fIsMemoryFlyoutOpen = true;
    AutomationProperties::SetName(MemoryButton, m_closeMemoryFlyoutAutomationName);
    EnableControls(false);
}

void Calculator::OnMemoryFlyoutClosing(_In_ FlyoutBase ^ sender, _In_ FlyoutBaseClosingEventArgs ^ args)
{
    // Set in the Closing event so the new name is available when the Flyout has Closed.
    AutomationProperties::SetName(MemoryButton, m_openMemoryFlyoutAutomationName);
}

void Calculator::OnMemoryFlyoutClosed(_In_ Object ^ sender, _In_ Object ^ args)
{
    // Ideally, this would be renamed in the Closing event because the Closed event is too late.
    // Closing is not available until RS1+ so we set the name again here for TH2 support.
    AutomationProperties::SetName(MemoryButton, m_openMemoryFlyoutAutomationName);
    m_fIsMemoryFlyoutOpen = false;
    EnableControls(true);
    if (MemoryButton->IsEnabled)
    {
        MemoryButton->Focus(::FocusState::Programmatic);
    }

    FullscreenFlyoutClosed();
}

Memory ^ Calculator::GetMemory()
{
    if (m_memory == nullptr)
    {
        m_memory = ref new Memory();
        VisualStateManager::GoToState(m_memory, GetCurrentLayoutState(), true /*useTransitions*/);
    }

    return m_memory;
}

void Calculator::OnHideMemoryClicked()
{
    if (!m_fIsMemoryFlyoutOpen)
    {
        this->Focus(::FocusState::Programmatic);
    }

    MemoryFlyout->Hide();
}

void Calculator::EnableMemoryControls(bool enable)
{
    MemButton->IsEnabled = enable;
    MemMinus->IsEnabled = enable;
    MemPlus->IsEnabled = enable;
    if (!Model->IsMemoryEmpty)
    {
        MemRecall->IsEnabled = enable;
        ClearMemoryButton->IsEnabled = enable;
    }
}

void Calculator::EnableControls(bool enable)
{
    OpsPanel->IsEnabled = enable;
    EnableMemoryControls(enable);
}

void Calculator::OnMemoryFlyOutTapped(_In_ Object ^ sender, _In_ TappedRoutedEventArgs ^ e)
{
    Grid ^ grid = safe_cast<Grid ^>(sender);
    Point point = e->GetPosition(nullptr);

    if (point.Y < (grid->ActualHeight - NumpadPanel->ActualHeight))
    {
        MemoryFlyout->Hide();
    }
}

void Calculator::OnHistoryFlyOutTapped(_In_ Object ^ sender, _In_ TappedRoutedEventArgs ^ e)
{
    Grid ^ grid = safe_cast<Grid ^>(sender);
    Point point = e->GetPosition(nullptr);

    if (point.Y < (grid->ActualHeight - NumpadPanel->ActualHeight))
    {
        HistoryFlyout->Hide();
    }
}

void Calculator::DockPanelTapped(_In_ TappedRoutedEventArgs ^ e)
{
    int index = DockPivot->SelectedIndex;
    if (index == 1 && !IsProgrammer)
    {
        SetChildAsMemory();
    }

    m_IsLastFlyoutMemory = false;
    m_IsLastFlyoutHistory = false;
}

void Calculator::UnregisterEventHandlers()
{
    ExpressionText->UnregisterEventHandlers();
    AlwaysOnTopResults->UnregisterEventHandlers();
}

void Calculator::OnErrorVisualStateCompleted(_In_ Platform::Object ^ sender, _In_ Platform::Object ^ e)
{
    SetDefaultFocus();
}

void Calculator::OnDisplayVisualStateCompleted(_In_ Object ^ sender, _In_ Object ^ e)
{
    SetDefaultFocus();
}

void Calculator::OnHistoryAccessKeyInvoked(_In_ UIElement ^ sender, _In_ AccessKeyInvokedEventArgs ^ args)
{
    DockPivot->SelectedItem = HistoryPivotItem;
}

void Calculator::OnMemoryAccessKeyInvoked(_In_ UIElement ^ sender, _In_ AccessKeyInvokedEventArgs ^ args)
{
    DockPivot->SelectedItem = MemoryPivotItem;
}

void CalculatorApp::Calculator::OnVisualStateChanged(Platform::Object ^ sender, Windows::UI::Xaml::VisualStateChangedEventArgs ^ e)
{
    if (!IsStandard && !IsScientific && !IsProgrammer)
    {
        return;
    }

    auto mode = IsStandard ? ViewMode::Standard : IsScientific ? ViewMode::Scientific : ViewMode::Programmer;
    TraceLogger::GetInstance()->LogVisualStateChanged(mode, e->NewState->Name, IsAlwaysOnTop);
}

void Calculator::Calculator_SizeChanged(Object ^ /*sender*/, SizeChangedEventArgs ^ /*e*/)
{
    if (Model->IsAlwaysOnTop)
    {
        AlwaysOnTopResults->UpdateScrollButtons();
    }
}

::Visibility Calculator::ShouldDisplayHistoryButton(bool isAlwaysOnTop, bool isProgrammer, ::Visibility dockPanelVisibility)
{
    return !isAlwaysOnTop && !isProgrammer && dockPanelVisibility == ::Visibility::Collapsed ? ::Visibility::Visible : ::Visibility::Collapsed;
}