void NavigationView::OnPropertyChanged()

in dev/NavigationView/NavigationView.cpp [3916:4079]
150 lines of code
39 McCabe index (conditional complexity)

void NavigationView::OnPropertyChanged(const winrt::DependencyPropertyChangedEventArgs& args)
{
    winrt::IDependencyProperty property = args.Property();

    if (property == s_IsPaneOpenProperty)
    {
        OnIsPaneOpenChanged();
        UpdateVisualStateForDisplayModeGroup(DisplayMode());
    }
    else if (property == s_CompactModeThresholdWidthProperty ||
        property == s_ExpandedModeThresholdWidthProperty)
    {
        UpdateAdaptiveLayout(ActualWidth());
    }
    else if (property == s_AlwaysShowHeaderProperty || property == s_HeaderProperty)
    {
        UpdateHeaderVisibility();
    }
    else if (property == s_SelectedItemProperty)
    {
        OnSelectedItemPropertyChanged(args);
    }
    else if (property == s_PaneTitleProperty)
    {
        UpdatePaneTitleFrameworkElementParents();
        UpdateBackAndCloseButtonsVisibility();
        UpdatePaneToggleSize();
    }
    else if (property == s_IsBackButtonVisibleProperty)
    {
        UpdateBackAndCloseButtonsVisibility();
        UpdateAdaptiveLayout(ActualWidth());
        if (IsTopNavigationView())
        {
            InvalidateTopNavPrimaryLayout();
        }

        if (g_IsTelemetryProviderEnabled && IsBackButtonVisible() == winrt::NavigationViewBackButtonVisible::Collapsed)
        {
            //  Explicitly disabling BackUI on NavigationView
            [[gsl::suppress(con.4)]] TraceLoggingWrite(
                g_hTelemetryProvider,
                "NavigationView_DisableBackUI",
                TraceLoggingDescription("Developer explicitly disables the BackUI on NavigationView"));
        }
        // Enabling back button shifts grid instead of resizing, so let's update the layout.
        if (const auto& backButton = m_backButton.get())
        {
            backButton.UpdateLayout();
        }
        UpdatePaneLayout();
    }
    else if (property == s_MenuItemsSourceProperty)
    {
        UpdateRepeaterItemsSource(true /*forceSelectionModelUpdate*/);
    }
    else if (property == s_MenuItemsProperty)
    {
        UpdateRepeaterItemsSource(true /*forceSelectionModelUpdate*/);
    }
    else if (property == s_FooterMenuItemsSourceProperty)
    {
        UpdateFooterRepeaterItemsSource(true /*sourceCollectionReset*/, true /*sourceCollectionChanged*/);
    }
    else if (property == s_FooterMenuItemsProperty)
    {
        UpdateFooterRepeaterItemsSource(true /*sourceCollectionReset*/, true /*sourceCollectionChanged*/);
    }
    else if (property == s_PaneDisplayModeProperty)
    {
        // m_wasForceClosed is set to true because ToggleButton is clicked and Pane is closed.
        // When PaneDisplayMode is changed, reset the force flag to make the Pane can be opened automatically again.
        m_wasForceClosed = false;

        CollapseTopLevelMenuItems(auto_unbox(args.OldValue()));
        UpdatePaneToggleButtonVisibility();
        UpdatePaneDisplayMode(auto_unbox(args.OldValue()), auto_unbox(args.NewValue()));
        UpdatePaneTitleFrameworkElementParents();
        UpdatePaneVisibility();
        UpdateVisualState();
        UpdatePaneButtonsWidths();
    }
    else if (property == s_IsPaneVisibleProperty)
    {
        UpdatePaneVisibility();
        UpdateVisualStateForDisplayModeGroup(DisplayMode());

        // When NavView is in expaneded mode with fixed window size, setting IsPaneVisible to false doesn't closes the pane
        // We manually close/open it for this case
        if (!IsPaneVisible() && IsPaneOpen())
        {
            ClosePane();
        }

        if (IsPaneVisible() && DisplayMode() == winrt::NavigationViewDisplayMode::Expanded && !IsPaneOpen())
        {
            OpenPane();
        }
    }
    else if (property == s_OverflowLabelModeProperty)
    {
        if (m_appliedTemplate)
        {
            UpdateVisualStateForOverflowButton();
            InvalidateTopNavPrimaryLayout();
        }
    }
    else if (property == s_AutoSuggestBoxProperty)
    {
        InvalidateTopNavPrimaryLayout();
        if (args.OldValue())
        {
            m_autoSuggestBoxQuerySubmittedRevoker.revoke();
        }
        if (const auto newAutoSuggestBox = args.NewValue().try_as<winrt::AutoSuggestBox>())
        {
            m_autoSuggestBoxQuerySubmittedRevoker = newAutoSuggestBox.QuerySubmitted(winrt::auto_revoke, {this, &NavigationView::OnAutoSuggestBoxQuerySubmitted });
        }
        UpdateVisualState(false);
    }
    else if (property == s_SelectionFollowsFocusProperty)
    {
        UpdateSingleSelectionFollowsFocusTemplateSetting();
    }
    else if (property == s_IsPaneToggleButtonVisibleProperty)
    {
        UpdatePaneTitleFrameworkElementParents();
        UpdateBackAndCloseButtonsVisibility();
        UpdatePaneToggleButtonVisibility();
        UpdateVisualState();
    }
    else if (property == s_IsSettingsVisibleProperty)
    {
        UpdateFooterRepeaterItemsSource(false /*sourceCollectionReset*/, true /*sourceCollectionChanged*/);
    }
    else if (property == s_CompactPaneLengthProperty)
    {
        if (!SharedHelpers::Is21H1OrHigher())
        {
            // Need to update receiver margins when CompactPaneLength changes
            UpdatePaneShadow();
        }

        // Update pane-button-grid width when pane is closed and we are not in minimal
        UpdatePaneButtonsWidths();
    }
    else if (property == s_IsTitleBarAutoPaddingEnabledProperty)
    {
        UpdateTitleBarPadding();
    }
    else if (property == s_MenuItemTemplateProperty ||
        property == s_MenuItemTemplateSelectorProperty)
    {
        SyncItemTemplates();
    }
    else if (property == s_PaneFooterProperty)
    {
        UpdatePaneLayout();
    }
    else if (property == s_OpenPaneLengthProperty)
    {
        UpdateOpenPaneWidth(ActualWidth());
    }
}