public MainNavigationViewModel(ISampleGalleryUIHost hostingUI)
{
_hostingUI = hostingUI;
_hostingUI.BackStackStateChanged += (object sender, EventArgs args) =>
{
// Show or hide the global back button
SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility =
_hostingUI.CanGoBack ?
AppViewBackButtonVisibility.Visible :
AppViewBackButtonVisibility.Collapsed;
};
SystemNavigationManager.GetForCurrentView().BackRequested += (object backSender, BackRequestedEventArgs backArgs) =>
{
_hostingUI.GoBack();
};
// Build a collection used to populate the navigation menu. This is where you can define the display names of
// each menu item and which page they map to.
_mainMenuList = new List <NavigationItem>();
AddNavigationItem(_mainMenuList, "Home", SampleCategory.None, typeof(HomePage), addEvenIfNoMatchingSamples: true, thumbnail: "ms-appx:///Assets/CategoryIcons/table_home_icon.png");
AddNavigationItem(_mainMenuList, "Light", SampleCategory.Light, typeof(BaseCategoryPage), categoryDescription: CategoryDescription_Light, thumbnail: "ms-appx:///Assets/CategoryIcons/table_light_icon_bw.png");
AddNavigationItem(_mainMenuList, "Depth", SampleCategory.Depth, typeof(BaseCategoryPage), categoryDescription: CategoryDescription_Depth, thumbnail: "ms-appx:///Assets/CategoryIcons/table_depth_icon_bw.png");
AddNavigationItem(_mainMenuList, "Motion", SampleCategory.Motion, typeof(BaseCategoryPage), categoryDescription: CategoryDescription_Motion, thumbnail: "ms-appx:///Assets/CategoryIcons/table_motion_icon_bw.png");
AddNavigationItem(_mainMenuList, "Material", SampleCategory.Material, typeof(BaseCategoryPage), categoryDescription: CategoryDescription_Material, thumbnail: "ms-appx:///Assets/CategoryIcons/table_material_icon_bw.png");
AddNavigationItem(_mainMenuList, "Scale", SampleCategory.Scale, typeof(BaseCategoryPage), categoryDescription: CategoryDescription_Scale, thumbnail: "ms-appx:///Assets/CategoryIcons/table_scale_icon_bw.png");
AddNavigationItem(_mainMenuList, "API Reference", SampleCategory.APIReference, typeof(BaseCategoryPage), categoryDescription: CategoryDescription_APIReference, thumbnail: "ms-appx:///Assets/CategoryIcons/table_reference_icon.png");
s_instance = this;
}
private void LoadUI(UIType type)
{
// Auto-detect the type to load if requested
if (type == UIType.Auto)
{
if (ApiInformation.IsApiContractPresent("Windows.Foundation.UniversalApiContract", 5))
{
type = UIType.NavView;
}
else
{
type = UIType.Pivot;
}
}
// Save off any properties that are stashed on the UI itself and need to be
// forwarded on to the new UI, load it, and then reapply the saved properties
object oldItemsSource = SampleCategories;
UIElement actualContent;
if (type == UIType.Pivot)
{
actualContent = new SampleGalleryPivotHost();
}
else
{
actualContent = new SampleGalleryNavViewHost();
}
Content = actualContent;
_actualContent = (ISampleGalleryUIHost)actualContent;
SampleCategories = oldItemsSource;
}
