private static Viewbox CreateImage(HtmlNode node, string src)
{
var viewbox = new Viewbox
{
StretchDirection = StretchDirection.DownOnly
};
var imgHeight = node.Attributes.GetValueInt("height");
var width = node.Attributes.GetValueInt("width");
if (imgHeight > 0)
{
viewbox.MaxHeight = imgHeight;
}
if (width > 0)
{
viewbox.MaxWidth = width;
}
viewbox.Child = new ImageEx
{
Source = src,
Stretch = Stretch.Uniform,
Background = new SolidColorBrush(Colors.Transparent),
Foreground = new SolidColorBrush(Colors.Transparent),
AnimateGif = true
};
return viewbox;
}
internal HtmlNode AddNode(HtmlTag tag)
{
var node = new HtmlNode(tag);
Fragments.Add(node);
return node;
}
private static int GetSpan(HtmlNode node, string name)
{
if (node != null)
{
return node.Attributes.GetValueInt(name);
}
return 0;
}
private static int? GetTableBorder(HtmlNode node)
{
var table = node?.Ascendant("table") as HtmlNode;
if (table != null && !string.IsNullOrEmpty(table.Attributes.GetValue("border")))
{
return table.Attributes.GetValueInt("border");
}
return null;
}
private static string GetImageSrc(HtmlNode node)
{
var regex = new Regex(@"(?:http(?:s?)://www\.youtube\.com/embed/)(?<videoid>[\w_-]*)(?:\??)(?:/?)(?:\.*)");
var src = GetIframeSrc(node);
if (!string.IsNullOrEmpty(src))
{
var match = regex.Match(src);
if (match.Success)
{
return $"https://i.ytimg.com/vi/{match.Groups["videoid"].Value}/maxresdefault.jpg";
}
}
return null;
}
protected abstract void SetScreenshot(ImageEx img, HtmlNode node);
protected override void SetScreenshot(ImageEx img, HtmlNode node)
{
img.Source = GetEmbebedImage("AppStudio.Uwp.Controls.HtmlBlock.channel9-screen.png");
img.Background = new SolidColorBrush(Color.FromArgb(255, 249, 203, 66));
}
private static string GetImageSrc(HtmlNode img)
{
if (!string.IsNullOrEmpty(img.Attributes.GetValue("src")))
{
return img.Attributes.GetValue("src");
}
else if (!string.IsNullOrEmpty(img.Attributes.GetValue("srcset")))
{
var regex = new Regex(@"(?:(?<src>[^\""'\s,]+)\s*(?:\s+\d+[wx])(?:,\s*)?)");
var matches = regex.Matches(img.Attributes.GetValue("srcset"));
if (matches.Count > 0)
{
var m = matches[matches.Count - 1];
return m?.Groups["src"].Value;
}
}
return null;
}
protected override void SetScreenshot(ImageEx img, HtmlNode node)
{
img.Source = GetImageSrc(node);
}
