protected override void OnTextChanged(string oldTextValue, string newTextValue)
{
base.OnTextChanged(oldTextValue, newTextValue);
if (IsSavingEnabled)
{
// Cancels the current execution
if (cancellationTokenSource != null)
{
cancellationTokenSource.Cancel();
}
// Creates a new instance for the cancellation token
IsSaving = true;
cancellationTokenSource = new CancellationTokenSource();
// Executes a background operation
Task.Run(async() =>
{
// Takes the token reference reference that will be cancelled after the next character inserted
var token = cancellationTokenSource.Token;
// Getting the bytes from the url that was inserted on the text
var bytes = await downloadService.DownloadImageUrl(newTextValue);
// If the token wasn't cancelled (when another character is inserted), send it to the ViewModel
if (!token.IsCancellationRequested)
{
Device.BeginInvokeOnMainThread(() =>
{
SaveCommand?.Execute(bytes);
IsSaving = false;
});
}
}, cancellationTokenSource.Token);
}
}