private void GenerateNewCache(QRCodeItem qrCodeItem)
{
var newCache = new NewItemPageViewModelCache
{
QRCodeItem = qrCodeItem,
CancellationTokenSource = new CancellationTokenSource()
};
_caches.Add(newCache);
var cancellationToken = newCache.CancellationTokenSource.Token;
newCache.Task = Task.Factory.StartNew(async() =>
{
// Cancel when request
await Task.Delay(700);
cancellationToken.ThrowIfCancellationRequested();
// Save file
_fileHelper.SaveByteArray(qrCodeItem.GenerateQRCodeByteArray(), qrCodeItem.Path);
// Cancel when request
await Task.Delay(300);
cancellationToken.ThrowIfCancellationRequested();
// Assign new item
Item = qrCodeItem;
IsBusy = false;
});
}
public ItemDetailPageViewModel(QRCodeItem item = null)
{
Title = item?.Data;
Item = item;
IsUrl = Uri.TryCreate(item?.Data, UriKind.Absolute, out Uri uriResult) && (uriResult.Scheme == Uri.UriSchemeHttp || uriResult.Scheme == Uri.UriSchemeHttps);
OpenUrlCommand = new Command(() => Device.OpenUri(new Uri(Item.Data)));
}
public async Task <bool> AddItemAsync(QRCodeItem item)
{
if (await _db.QRCodeItems.AnyAsync(qrci => qrci.Data == item.Data))
{
return(true);
}
await _db.QRCodeItems.AddAsync(item);
await _db.SaveChangesAsync();
return(true);
}
public async Task <bool> DeleteItemAsync(QRCodeItem item)
{
if (await _db.QRCodeItems.AnyAsync(i => i.Data == item.Data) == false)
{
throw new Exception("The item does not exist.");
}
_fileHelper.RemoveFile(item.Path);
_db.QRCodeItems.Remove(item);
await _db.SaveChangesAsync();
return(true);
}
public NewItemPageViewModel(string initialInputText)
{
using (var scope = AppContainer.Container.BeginLifetimeScope())
{
_fileHelper = AppContainer.Container.Resolve <IFileHelper>();
}
Title = "New QR Code";
IsBusy = false;
PropertyChanged += (sender, e) =>
{
if (e.PropertyName == nameof(InputText))
{
IsBusy = true;
// Cancel previous generations
foreach (var cache in _caches.Where(h => h.CancellationTokenSource.IsCancellationRequested == false))
{
cache.CancellationTokenSource.Cancel();
}
if (_inputText == "")
{
IsBusy = false;
Item = null;
return;
}
GenerateNewCache(new QRCodeItem(_inputText));
}
};
InputText = initialInputText ?? throw new ArgumentNullException(nameof(initialInputText));
}
public Task <bool> UpdateItemAsync(QRCodeItem item)
{
throw new NotImplementedException();
}
public override void ViewDidLoad()
{
base.ViewDidLoad();
// For example, look for an image and place it into an image view.
// Replace this with something appropriate for the type[s] your extension supports.
bool imageFound = false;
foreach (var item in ExtensionContext.InputItems)
{
foreach (var itemProvider in item.Attachments)
{
var foundType = _acceptedTypes.FirstOrDefault(at => itemProvider.HasItemConformingTo(at));
if (foundType == null)
{
continue;
}
itemProvider.LoadItem(foundType, null, (urlObj, error) =>
{
var url = urlObj.ToString();
Console.WriteLine(url);
if (url.Length > 256)
{
var deepLinkingUrl = string.Format("ShareQR://com.ettech.ShareQR?data={0}", url);
NSOperationQueue.MainQueue.AddOperation(() =>
{
_isOpenedInContainingApp = true;
OpenURL(new NSUrl(deepLinkingUrl));
});
}
else
{
dataLabel.Text = url;
Task.Factory.StartNew(() =>
{
_qrCodeItem = new QRCodeItem(_fileHelper, url);
_qrCodeByteArray = _qrCodeItem.GenerateQRCodeByteArray();
using (var qrCodeByteBuffer = NSData.FromArray(_qrCodeByteArray))
{
var image = UIImage.LoadFromData(qrCodeByteBuffer);
NSOperationQueue.MainQueue.AddOperation(() => imageView.Image = image);
}
});
}
});
imageFound = true;
break;
}
if (imageFound)
{
NSOperationQueue.MainQueue.AddOperation(() => saveButton.Enabled = true);
break;
}
}
}