private void NavigateContent(string tag)
{
if (!ContentMap.ContainsKey(tag))
{
Debug.WriteLine($"未知的内容: {tag}");
return;
}
if (NavigateHistory.ContainsKey(tag))
{
// has history
if (previousTag != null)
{
// save previous content history
NavigateHistory[previousTag] = ContentFrame.GetNavigationState();
}
// restore history
ContentFrame.SetNavigationState(NavigateHistory[tag]);
}
else
{
// navigate to new content
ContentFrame.Navigate(ContentMap[tag]);
}
previousTag = tag;
}
public MainPage()
{
ViewModel = App.ViewModel;
this.InitializeComponent();
CoreApplication.GetCurrentView().TitleBar.ExtendViewIntoTitleBar = true;
Windows.UI.ViewManagement.ApplicationView.GetForCurrentView().TitleBar.ButtonBackgroundColor = Color.FromArgb(0, 0, 0, 0);
SystemNavigationManager.GetForCurrentView().BackRequested += App_BackRequested;
if (ApplicationData.Current.LocalSettings.Values.ContainsKey("myNavigationState"))
{
ContentFrame.SetNavigationState((string)ApplicationData.Current.LocalSettings.Values["myNavigationState"]);
ApplicationData.Current.LocalSettings.Values.Remove("myNavigationState");
Windows.UI.Core.SystemNavigationManager.GetForCurrentView().AppViewBackButtonVisibility = (ContentFrame.CanGoBack) ? AppViewBackButtonVisibility.Visible : AppViewBackButtonVisibility.Collapsed;
}
else
{
ContentFrame.Navigate(typeof(NavigatorPage));
}
ContentFrame.Visibility = Visibility.Visible;
Current = this;
}
