/// <summary>
/// Reverts the page.
/// </summary>
private async void RevertButton_Click(object sender, RoutedEventArgs e)
{
var saveDialog = new SaveChangesDialog()
{
Title = $"Save changes to Invoice # {ViewModel.InvoiceNumber.ToString()}?",
Message = $"Invoice # {ViewModel.InvoiceNumber.ToString()} " +
"has unsaved changes that will be lost. Do you want to save your changes?"
};
await saveDialog.ShowAsync();
SaveChangesDialogResult result = saveDialog.Result;
switch (result)
{
case SaveChangesDialogResult.Save:
await ViewModel.SaveOrder();
ViewModel = await OrderDetailPageViewModel.CreateFromGuid(ViewModel.Id);
break;
case SaveChangesDialogResult.DontSave:
ViewModel = await OrderDetailPageViewModel.CreateFromGuid(ViewModel.Id);
break;
case SaveChangesDialogResult.Cancel:
break;
}
}
/// <summary>
/// Check whether there are unsaved changes and warn the user.
/// </summary>
protected async override void OnNavigatingFrom(NavigatingCancelEventArgs e)
{
if (ViewModel.HasChanges)
{
var saveDialog = new SaveChangesDialog()
{
Title = $"Save changes to Invoice # {ViewModel.InvoiceNumber.ToString()}?",
Message = $"Invoice # {ViewModel.InvoiceNumber.ToString()} " +
"has unsaved changes that will be lost. Do you want to save your changes?"
};
await saveDialog.ShowAsync();
SaveChangesDialogResult result = saveDialog.Result;
switch (result)
{
case SaveChangesDialogResult.Save:
await ViewModel.SaveOrder();
break;
case SaveChangesDialogResult.DontSave:
break;
case SaveChangesDialogResult.Cancel:
if (e.NavigationMode == NavigationMode.Back)
{
Frame.GoForward();
}
else
{
Frame.GoBack();
}
e.Cancel = true;
// This flag gets cleared on navigation, so restore it.
ViewModel.HasChanges = true;
break;
}
}
base.OnNavigatingFrom(e);
}
