protected override void OnElementChanged(ElementChangedEventArgs <ZXingBarcodeImageView> e)
{
formsView = Element;
if (imageView == null)
{
imageView = new ImageView(Xamarin.Forms.Forms.Context);
base.SetNativeControl(imageView);
}
if (formsView != null && formsView.BarcodeValue != null)
{
var writer = new ZXing.Mobile.BarcodeWriter();
if (formsView != null && formsView.BarcodeOptions != null)
{
writer.Options = formsView.BarcodeOptions;
}
if (formsView != null && formsView.BarcodeFormat != null)
{
writer.Format = formsView.BarcodeFormat;
}
var value = formsView != null ? formsView.BarcodeValue : string.Empty;
var image = writer.Write(value);
imageView.SetImageBitmap(image);
}
base.OnElementChanged(e);
}
void regenerate()
{
if (formsView != null && formsView.BarcodeValue != null)
{
var writer = new ZXing.Mobile.BarcodeWriter();
if (formsView != null && formsView.BarcodeOptions != null)
{
writer.Options = formsView.BarcodeOptions;
}
if (formsView != null && formsView.BarcodeFormat != null)
{
writer.Format = formsView.BarcodeFormat;
}
var value = formsView != null ? formsView.BarcodeValue : string.Empty;
Device.BeginInvokeOnMainThread(() =>
{
var image = writer.Write(value);
imageView.Source = image;
});
}
}
private UIImage GetQRCode(string url)
{
var writer = new ZXing.Mobile.BarcodeWriter {
Format = BarcodeFormat.QR_CODE,
Options = new ZXing.Common.EncodingOptions {
Height = 250,
Width = 250
}
};
return(writer.Write(url));
}
public Stream ConvertImageStream(string text, int width = 500, int height = 500)
{
var barcodeWriter = new ZXing.Mobile.BarcodeWriter
{
Format = ZXing.BarcodeFormat.QR_CODE,
Options = new ZXing.Common.EncodingOptions
{
Width = width,
Height = height,
Margin = 2
}
};
barcodeWriter.Renderer = new ZXing.Mobile.BitmapRenderer();
var bitmap = barcodeWriter.Write(text);
var stream = new MemoryStream();
bitmap.Compress(Bitmap.CompressFormat.Jpeg, 100, stream); // this is the diff between iOS and Android
stream.Position = 0;
return(stream);
}
void regenerate()
{
if (formsView != null && formsView.BarcodeValue != null)
{
var writer = new ZXing.Mobile.BarcodeWriter();
if (formsView != null && formsView.BarcodeOptions != null)
{
writer.Options = formsView.BarcodeOptions;
}
if (formsView != null && formsView.BarcodeFormat != null)
{
writer.Format = formsView.BarcodeFormat;
}
var value = formsView != null ? formsView.BarcodeValue : string.Empty;
var image = writer.Write(value);
imageView.SetImageBitmap(image);
}
}
public Bitmap GenerateQrImage(string content, int width, int height)
{
var writer = new ZXing.Mobile.BarcodeWriter
{
Format = BarcodeFormat.QR_CODE,
Options = new ZXing.Common.EncodingOptions
{
Height = height,
Width = width,
Margin = 0,
PureBarcode = true,
}
};
writer.Renderer = new ZXing.Mobile.BitmapRenderer {
Background = Color.Red, Foreground = Color.Black
};
var bitmap = writer.Write(content);
//var stream = new MemoryStream();
//bitmap.Compress(Bitmap.CompressFormat.Png, 100, stream); // this is the diff between iOS and Android
//stream.Position = 0;
return(bitmap);
}
