private void OnTextChanged(string newValue, string oldValue)
{
var canvas = Canvas;
if (canvas == null)
{
_text = newValue;
return;
}
if (string.IsNullOrEmpty(newValue))
{
canvas.Source = null;
return;
}
if (oldValue != null)
{
if (string.Equals(newValue, oldValue, StringComparison.OrdinalIgnoreCase) ||
string.Equals(newValue, _text, StringComparison.OrdinalIgnoreCase))
{
return;
}
}
_text = newValue;
var foreground = Colors.Black;
var background = Colors.White;
if (Foreground is SolidColorBrush foreBrush)
{
foreground = foreBrush.Color;
}
if (Background is SolidColorBrush backBrush)
{
background = backBrush.Color;
}
canvas.Source = PlaceholderHelper.GetQr(newValue, foreground, background);
}