/// <summary>
/// Switches to a Page which is to send back a result of type TResult
/// </summary>
public async Task <TResult> PromptAsync <TResult>(IResultPage <TResult> page)
{
// wrap new page in NavigationPage so it appears like pages launched from ShowAsync
var wrappedPage = new NavigationPage((Page)page);
await _navigation.PushModalAsync(wrappedPage, true);
return(await page.GetResultAsync());
}
/// <summary>
/// Switches back to Page which called PromptAsync() and sends back the result
/// </summary>
public void Return <TResult>(TResult value, IResultPage <TResult> sender)
{
if (sender.Awaiter.Task.IsCompleted || sender.Awaiter.Task.IsCanceled || sender.Awaiter.Task.IsFaulted)
{
return; // already called Return, perhaps error or user double clicked before visually returned back to previous page
}
if (!(sender is Page))
{
throw new InvalidOperationException($"Storyboard.Return cannot be called with sender not being a page. Was {sender.GetType().Name}");
}
sender.Awaiter.SetResult(value);
// go back in navigation stack
_navigation.PopModalAsync();
}
/// <summary>
/// Uses the IResultPage's Awaiter property to allow us to <code>await</code> from the result.
/// </summary>
public static async Task <TResult> GetResultAsync <TResult>(this IResultPage <TResult> page)
{
return(await page.Awaiter.Task);
}
public void RegisterCancelATest(IResultPage resultPage)
{
resultPage.CancelTest += new CustomEventArgs.EventHandlerDefinitions.CancelTestEventHandler(CancelTest);
}
public void RegisterCancelATest(IResultPage resultPage)
{
resultPage.CancelTest += new CustomEventArgs.EventHandlerDefinitions.CancelTestEventHandler(CancelTest);
}
