void MapMenuItems()
{
List <BaseShellItem> items;
IShellItemController shellItemController = VirtualView;
if (Routing.IsImplicit(VirtualView))
{
items = new List <BaseShellItem>(((IShellSectionController)VirtualView.CurrentItem).GetItems());
}
else
{
items = new List <BaseShellItem>(shellItemController.GetItems());
}
bool hasTabs = shellItemController.ShowTabs;
object?selectedItem = null;
_mainLevelTabs.SyncItems(items, (navItem, baseShellItem) =>
{
SetValues(baseShellItem, navItem);
if (baseShellItem is not ShellSection shellSection)
{
navItem.MenuItemsSource = null;
if (baseShellItem.Parent == VirtualView.CurrentItem)
{
selectedItem = navItem;
}
return;
}
var shellSectionItems = ((IShellSectionController)shellSection).GetItems();
if (shellSection == VirtualView.CurrentItem)
{
selectedItem = navItem;
}
if (shellSectionItems.Count <= 1)
{
if (navItem.MenuItemsSource != null)
{
navItem.MenuItemsSource = null;
}
}
else
{
navItem.MenuItemsSource ??= new ObservableCollection <NavigationViewItemViewModel>();
navItem
.MenuItemsSource
.SyncItems(shellSectionItems, (shellContentNavItem, shellContent) =>
{
SetValues(shellContent, shellContentNavItem);
if (shellSection == VirtualView.CurrentItem &&
shellContent == VirtualView.CurrentItem.CurrentItem)
{
selectedItem = shellContentNavItem;
}
});
hasTabs = hasTabs || shellSectionItems.Count > 1;
}
void SetValues(BaseShellItem bsi, NavigationViewItemViewModel vm)
{
vm.Content = bsi.Title;
var iconSource = bsi.Icon?.ToIconSource(MauiContext !);
if (iconSource != null)
{
if (vm.Foreground != null)
{
iconSource.Foreground = vm.Foreground;
}
else if (PlatformView.Resources.TryGetValue("NavigationViewItemForeground", out object nviForeground) &&
nviForeground is WBrush brush)
{
iconSource.Foreground = brush;
}
}
vm.Icon = iconSource?.CreateIconElement();
}
});
void MapMenuItems()
{
// NavigationView makes a lot of changes to properties before it's been loaded
// So we like to just wait until it's loaded to project our changes over it
if (!ShellItemNavigationView.IsLoaded)
{
return;
}
IShellItemController shellItemController = VirtualView;
var items = new List <BaseShellItem>();
// only add items if we should be showing the tabs
if (shellItemController.ShowTabs)
{
foreach (var item in shellItemController.GetItems())
{
if (Routing.IsImplicit(item))
{
items.Add(item.CurrentItem);
}
else
{
items.Add(item);
}
}
}
object?selectedItem = null;
_mainLevelTabs.SyncItems(items, (navItem, baseShellItem) =>
{
SetValues(baseShellItem, navItem);
if (baseShellItem is not ShellSection shellSection)
{
navItem.MenuItemsSource = null;
if (baseShellItem.Parent == VirtualView.CurrentItem)
{
selectedItem = navItem;
}
return;
}
var shellSectionItems = ((IShellSectionController)shellSection).GetItems();
if (shellSection == VirtualView.CurrentItem)
{
selectedItem = navItem;
}
if (shellSectionItems.Count <= 1)
{
if (navItem.MenuItemsSource != null)
{
navItem.MenuItemsSource = null;
}
}
else
{
navItem.MenuItemsSource ??= new ObservableCollection <NavigationViewItemViewModel>();
navItem
.MenuItemsSource
.SyncItems(shellSectionItems, (shellContentNavItem, shellContent) =>
{
SetValues(shellContent, shellContentNavItem);
if (shellSection == VirtualView.CurrentItem &&
shellContent == VirtualView.CurrentItem.CurrentItem)
{
selectedItem = shellContentNavItem;
}
});
}
void SetValues(BaseShellItem bsi, NavigationViewItemViewModel vm)
{
vm.Content = bsi.Title;
var iconSource = bsi.Icon?.ToIconSource(MauiContext !);
if (iconSource != null)
{
if (vm.Foreground != null)
{
iconSource.Foreground = vm.Foreground;
}
else if (PlatformView.Resources.TryGetValue("NavigationViewItemForeground", out object nviForeground) &&
nviForeground is WBrush brush)
{
iconSource.Foreground = brush;
}
}
vm.Icon = iconSource?.CreateIconElement();
}
});
