/// <summary>
/// Goes to the previous Menu Item
/// </summary>
/// <returns>The new page</returns>
public Menu GoBack()
{
// Trigger exit if nothing exists
IMenuNavigationHook currentPage = Peek();
if (currentPage == null)
{
OnExit?.Invoke(this, new object());
return(null);
}
// Unload the Previous Menu
currentPage.InvokeOnNavigatingFrom(this, new object());
currentPage = m_backStack.Pop();
currentPage.InvokeOnUnloaded(this, new object());
// Resume the previous page
IMenuNavigationHook newPage = Peek();
if (newPage == null)
{
OnExit?.Invoke(this, new object());
return(null);
}
newPage?.InvokeOnNavigatingTo(this, new object());
newPage?.InvokeOnNavigated(this, new object());
newPage?.InvokeOnLoaded(this, new object());
// Return the new menu
return(newPage as Menu);
}
/// <summary>
/// Navigates to a new Menu
/// </summary>
/// <param name="menu">The new Menu</param>
public void Navigate(Menu menu)
{
var iMenu = menu as IMenuNavigationHook;
// Unload the Previous Menu
IMenuNavigationHook currentPage = Peek();
if (currentPage != null)
{
currentPage.InvokeOnNavigatingFrom(this, new object());
currentPage.InvokeOnUnloaded(this, new object());
}
// Load the New Menu
iMenu.InvokeOnNavigatingTo(this, new object());
m_backStack.Push(menu);
iMenu.InvokeOnNavigated(this, new object());
iMenu.InvokeOnLoaded(this, new object());
}
