private static string GetSizeConstraintQueryString(SizeConstraint constraint)
{
var sizeConstraintParameters = new NameValueCollection();
sizeConstraintParameters.AddSizeConstraint(constraint);
return(sizeConstraintParameters.ToQueryString());
}
/// <summary>
/// Adds size constraint's values to the collection.
/// </summary>
/// <param name="collection">The name value collection.</param>
/// <param name="constraint">Size constraint.</param>
public static void AddSizeConstraint(this NameValueCollection collection, SizeConstraint constraint)
{
if (constraint.WidthComponent > 0)
{
collection.Add("width", constraint.WidthComponent);
}
if (constraint.HeightComponent > 0)
{
collection.Add("height", constraint.HeightComponent);
}
if (constraint.MaxWidthOrHeightComponent > 0)
{
collection.Add("maxsidesize", constraint.MaxWidthOrHeightComponent);
}
// Prevent Kentico from using site settings
if (!constraint.IsEmpty)
{
collection.Add("resizemode", "force");
}
}
/// <summary>
/// Generates a fully qualified URL to the specified image path.
/// </summary>
/// <param name="instance">The object that provides methods to build URLs to Kentico content.</param>
/// <param name="path">The virtual path of the image.</param>
/// <param name="constraint">The size constraint that is enforced on image when resizing.</param>
/// <returns>The fully qualified URL to the image.</returns>
/// <exception cref="ArgumentNullException"><paramref name="instance"/> is null.</exception>
/// <exception cref="ArgumentException"><paramref name="path"/> is null, empty or contains query string parameters.</exception>
public static string ImageUrl(this ExtensionPoint <UrlHelper> instance, string path, SizeConstraint constraint)
{
if (instance == null)
{
throw new ArgumentNullException(nameof(instance));
}
if (string.IsNullOrEmpty(path))
{
throw new ArgumentException("The image path needs to be provided.");
}
var absolutePath = instance.Target.Content(path);
var queryString = GetSizeConstraintQueryString(constraint);
return(BuildUrl(absolutePath, queryString));
}