public async void GetMegaContacts()
{
// User must be online to perform this operation
if (!await IsUserOnlineAsync())
{
return;
}
// First cancel any other loading task that is busy
CancelLoad();
// Create the option to cancel
CreateLoadCancelOption();
await OnUiThreadAsync(() => this.ItemCollection.Clear());
MUserList contactsList = this.MegaSdk.getContacts();
await Task.Factory.StartNew(() =>
{
try
{
for (int i = 0; i < contactsList.size(); i++)
{
// If the task has been cancelled, stop processing
if (LoadingCancelToken.IsCancellationRequested)
{
LoadingCancelToken.ThrowIfCancellationRequested();
}
// To avoid null values
if (contactsList.get(i) == null)
{
continue;
}
if (contactsList.get(i).getVisibility() != MUserVisibility.VISIBILITY_VISIBLE)
{
continue;
}
var megaContact = new ContactViewModel(contactsList.get(i), this);
OnUiThread(() => this.ItemCollection.Items.Add(megaContact));
megaContact.GetContactFirstname();
megaContact.GetContactLastname();
megaContact.GetContactAvatarColor();
megaContact.GetContactAvatar();
}
}
catch (OperationCanceledException)
{
// Do nothing. Just exit this background process because a cancellation exception has been thrown
}
}, LoadingCancelToken, TaskCreationOptions.PreferFairness, TaskScheduler.Current);
this.SortBy(this.CurrentOrder, this.ItemCollection.CurrentOrderDirection);
}
protected void OnContactUpdated(object sender, MUser user)
{
var existingContact = (ContactViewModel)this.ItemCollection.Items.FirstOrDefault(
contact => contact.Handle.Equals(user.getHandle()));
// If the contact exists in the contact list
if (existingContact != null)
{
//If the contact is no longer a contact(REMOVE CONTACT SCENARIO)
if (!existingContact.Visibility.Equals(user.getVisibility()) &&
!(user.getVisibility().Equals(MUserVisibility.VISIBILITY_VISIBLE)))
{
OnUiThread(() => this.ItemCollection.Items.Remove(existingContact));
}
// If the contact has been changed (UPDATE CONTACT SCENARIO) and is not an own change
else if (!Convert.ToBoolean(user.isOwnChange()))
{
if (user.hasChanged((int)MUserChangeType.CHANGE_TYPE_AVATAR) &&
!string.IsNullOrWhiteSpace(existingContact.AvatarPath))
{
existingContact.GetContactAvatar();
}
if (user.hasChanged((int)MUserChangeType.CHANGE_TYPE_EMAIL))
{
OnUiThread(() => existingContact.Email = user.getEmail());
}
if (user.hasChanged((int)MUserChangeType.CHANGE_TYPE_FIRSTNAME))
{
existingContact.GetContactFirstname();
}
if (user.hasChanged((int)MUserChangeType.CHANGE_TYPE_LASTNAME))
{
existingContact.GetContactLastname();
}
}
}
// If is a new contact (ADD CONTACT SCENARIO - REQUEST ACCEPTED)
else if (user.getVisibility().Equals(MUserVisibility.VISIBILITY_VISIBLE))
{
var megaContact = new ContactViewModel(user, this);
OnUiThread(() => this.ItemCollection.Items.Add(megaContact));
megaContact.GetContactFirstname();
megaContact.GetContactLastname();
megaContact.GetContactAvatarColor();
megaContact.GetContactAvatar();
}
}
