/// <summary>
/// Set image of this image box by analyzing the src attribute.<br/>
/// Load the image from inline base64 encoded string.<br/>
/// Or from calling property/method on the bridge object that returns image or url to image.<br/>
/// Or from file path<br/>
/// Or from URI.
/// </summary>
/// <remarks>
/// File path and URI image loading is executed async and after finishing calling <see cref="ImageLoadComplete"/>
/// on the main thread and not thread-pool.
/// </remarks>
/// <param name="htmlContainer">the container of the html to handle load image for</param>
/// <param name="src">the source of the image to load</param>
/// <param name="attributes">the collection of attributes on the element to use in event</param>
/// <returns>the image object (null if failed)</returns>
public void LoadImage(HtmlContainer htmlContainer, string src, Dictionary<string, string> attributes)
{
ArgChecker.AssertArgNotNull(htmlContainer, "htmlContainer");
_htmlContainer = htmlContainer;
try
{
var args = new HtmlImageLoadEventArgs(src, attributes, OnHtmlImageLoadEventCallback);
_htmlContainer.RaiseHtmlImageLoadEvent(args);
_asyncCallback = true;
if (!args.Handled)
{
if (!string.IsNullOrEmpty(src))
{
if (src.StartsWith("data:image", StringComparison.CurrentCultureIgnoreCase))
{
_image = GetImageFromData(src);
if (_image == null)
_htmlContainer.ReportError(HtmlRenderErrorType.Image, "Failed extract image from inline data");
_releaseImageObject = true;
ImageLoadComplete(false);
}
else
{
SetImageFromPath(src);
}
}
else
{
ImageLoadComplete(false);
}
}
}
catch (Exception ex)
{
_htmlContainer.ReportError(HtmlRenderErrorType.Image, "Exception in handling image source", ex);
ImageLoadComplete(false);
}
}
/// <summary>
/// Propagate the image load event from root container.
/// </summary>
private void OnImageLoad(object sender, HtmlImageLoadEventArgs e)
{
if (ImageLoad != null)
{
ImageLoad(this, e);
}
}
/// <summary>
/// Raise the image load event with the given event args.
/// </summary>
/// <param name="args">the event args</param>
internal void RaiseHtmlImageLoadEvent(HtmlImageLoadEventArgs args)
{
try
{
if(ImageLoad != null)
{
ImageLoad(this, args);
}
}
catch (Exception ex)
{
ReportError(HtmlRenderErrorType.Image, "Failed image load event", ex);
}
}
/// <summary>
/// On image load in renderer set the image by event async.
/// </summary>
private static void OnImageLoad(object sender, HtmlImageLoadEventArgs e)
{
var img = TryLoadResourceImage(e.Src);
if(!e.Handled && e.Attributes != null)
{
if (e.Attributes.ContainsKey("byevent"))
{
int delay;
if (int.TryParse(e.Attributes["byevent"], out delay))
{
e.Handled = true;
ThreadPool.QueueUserWorkItem(state =>
{
Thread.Sleep(delay);
e.Callback("https://fbcdn-sphotos-a-a.akamaihd.net/hphotos-ak-snc7/c0.44.403.403/p403x403/318890_10151195988833836_1081776452_n.jpg");
});
return;
}
else
{
e.Callback("http://sphotos-a.xx.fbcdn.net/hphotos-ash4/c22.0.403.403/p403x403/263440_10152243591765596_773620816_n.jpg");
return;
}
}
else if (e.Attributes.ContainsKey("byrect"))
{
var split = e.Attributes["byrect"].Split(',');
var rect = new Rectangle(int.Parse(split[0]), int.Parse(split[1]), int.Parse(split[2]), int.Parse(split[3]));
e.Callback( img ?? Resources.html32, rect);
return;
}
}
if (img != null)
e.Callback(img);
}