override void OnApplyTemplate()
{
base.OnApplyTemplate();
// Get a reference to the templated parts
_image = GetTemplateChild("Image") as Image;
if (_image == null)
{
throw new Exception("Missing 'Image' Template part.");
}
// Initialize default swatch dpi with the view dpi
_swatchDpi = CompatUtility.IsDesignMode ? 96.0 : CompatUtility.LogicalDpi(this);
}
private void OnSwatchDpiChanged(double newValue)
{
_swatchDpi = newValue > 0.0 ? newValue : CompatUtility.LogicalDpi(this);
SetDirty();
}