/// <summary>
/// Constructor with actions before pop and push
/// </summary>
/// <param name="navigation"><see cref="INavigation"/> property from your <see cref="NavigationPage"/>.</param>
/// <param name="pageLocator"><see cref="IPageLocator"/> that you created.</param>
/// <param name="beforePopStrategy">
/// Strategy that will be invoked every time before <see cref="Page"/> will be taken from navigation stack.
/// Passing <see cref="Page"/> object that will be removed.
/// </param>
/// <param name="beforePushStrategy">
/// Strategy that will be invoked every time before <see cref="Page"/> will be pushed on top of the navigation stack.
/// Passing <see cref="Page"/> object that will be added.
/// </param>
public NavigationService(INavigation navigation, IPageLocator pageLocator, IPopStrategy beforePopStrategy, IPushStrategy beforePushStrategy)
{
_navigationParameters = new Dictionary <string, object>();
_cancellationTokenSource = new CancellationTokenSource();
_pageNavigation = navigation;
_pageLocator = pageLocator;
_popStrategy = beforePopStrategy;
_pushStrategy = beforePushStrategy;
}
/// <summary>
/// Constructor with strategy for pushing
/// </summary>
/// <param name="navigation"><see cref="INavigation"/> property from your <see cref="NavigationPage"/>.</param>
/// <param name="pageLocator"><see cref="IPageLocator"/> that you created.</param>
/// <param name="beforePushStrategy"><see cref="IPushStrategy"/> that will be invoked before page is pushed to the navigation stack.</param>
public NavigationService(INavigation navigation, IPageLocator pageLocator, IPushStrategy beforePushStrategy)
: this(navigation, pageLocator, new DoNothingStrategy(), beforePushStrategy)
{
}