/// <summary>
/// Navigate back in current page modal navigation stack.
/// </summary>
/// <param name="closeModal">Close modal page</param>
/// <param name="parameter">The navigation paremeter</param>
public Task GoBackModalAsync(bool closeModal, object parameter = null)
{
ContentPage backOutPage = m_navigation.NavigationStack.LastOrDefault();
ContentPage backInPage = null;
if (m_navigation.NavigationStack.Count > 2 && closeModal == false)
{
backInPage = m_navigation.NavigationStack.ElementAt(m_navigation.NavigationStack.Count - 2);
}
DissapearEventArgs dissapearArgs = new DissapearEventArgs(NavigationDirection.Out);
AppearEventArgs appearArgs = new AppearEventArgs(NavigationDirection.In, parameter);
NavigationPage.InvokeOnNavigationAwareElement(backOutPage, v => v.OnDissapearing(dissapearArgs));
NavigationPage.InvokeOnNavigationAwareElement(backInPage, v => v.OnAppearing(appearArgs));
return(m_navigation.PopModalAsync(closeModal).ContinueWith((arg) =>
{
NavigationPage.InvokeOnNavigationAwareElement(backOutPage, v => v.OnDissapeared(dissapearArgs));
NavigationPage.InvokeOnNavigationAwareElement(backInPage, v => v.OnAppeared(appearArgs));
TaskCompletionSource <object> tcs = m_modalTaskDictionary[backOutPage];
m_modalTaskDictionary.Remove(backOutPage);
tcs.SetResult(parameter);
}));
}
/// <summary>
/// Page is dissapeared from the screen and animation is finished
/// </summary>
public virtual void OnDissapeared(DissapearEventArgs args)
{
if (IsDebugEnabled)
{
Debug.WriteLine(NavigationBar.GetTitle(this) + ": OnDissepeared");
}
LifecycleState = LifecycleStates.Dissapeared;
}
/// <summary>
///
/// </summary>
public void Clear()
{
if (m_navigation.NavigationStack.Count > 0)
{
ContentPage currentPage = m_navigation.NavigationStack.Last();
DissapearEventArgs dissapearArgs = new DissapearEventArgs(NavigationDirection.Out);
NavigationPage.InvokeOnNavigationAwareElement(currentPage, v => v.OnDissapearing(dissapearArgs));
NavigationPage.InvokeOnNavigationAwareElement(currentPage, v => v.OnDissapeared(dissapearArgs));
}
m_navigation.Clear();
}
/// <summary>
/// Navigate to new modal page. If current page has modal pages visible, then modal pages is closed
/// with current page.
/// </summary>
/// <param name="page">Page class name</param>
/// <param name="parameter">The navigation parameter</param>
public Task <object> NavigateModalAsync(string page, object parameter)
{
ContentPage currentModalPage = m_navigation.ModalNavigationStack.LastOrDefault();
ContentPage nextModalPage = m_createPage(page);
DissapearEventArgs dissapearArgs = new DissapearEventArgs(NavigationDirection.Out);
AppearEventArgs appearArgs = new AppearEventArgs(NavigationDirection.In, parameter);
NavigationPage.InvokeOnNavigationAwareElement(currentModalPage, v => v.OnDissapearing(dissapearArgs));
NavigationPage.InvokeOnNavigationAwareElement(nextModalPage, v => v.OnAppearing(appearArgs));
m_navigation.PushModalAsync(nextModalPage).ContinueWith((arg) =>
{
NavigationPage.InvokeOnNavigationAwareElement(currentModalPage, v => v.OnDissapeared(dissapearArgs));
NavigationPage.InvokeOnNavigationAwareElement(nextModalPage, v => v.OnAppeared(appearArgs));
});
TaskCompletionSource <object> tcs = new TaskCompletionSource <object>();
m_modalTaskDictionary.Add(nextModalPage, tcs);
return(tcs.Task);
}
