/// <summary>
/// Load stylesheet data from the given source.<br/>
/// The source can be local file or web URI.<br/>
/// First raise <see cref="HtmlStylesheetLoadEventArgs"/> event to allow the client to overwrite the stylesheet loading.<br/>
/// If the stylesheet is downloaded from URI we will try to correct local URIs to absolute.<br/>
/// </summary>
/// <param name="htmlContainer">the container of the html to handle load stylesheet for</param>
/// <param name="src">the source of the element to load the stylesheet by</param>
/// <param name="attributes">the attributes of the link element</param>
/// <param name="stylesheet">return the stylesheet string that has been loaded (null if failed or <paramref name="stylesheetData"/> is given)</param>
/// <param name="stylesheetData">return stylesheet data object that was provided by overwrite (null if failed or <paramref name="stylesheet"/> is given)</param>
public static void LoadStylesheet(HtmlContainerInt htmlContainer, string src, Dictionary<string, string> attributes, out string stylesheet, out CssData stylesheetData)
{
ArgChecker.AssertArgNotNull(htmlContainer, "htmlContainer");
stylesheet = null;
stylesheetData = null;
try
{
var args = new HtmlStylesheetLoadEventArgs(src, attributes);
htmlContainer.RaiseHtmlStylesheetLoadEvent(args);
if (!string.IsNullOrEmpty(args.SetStyleSheet))
{
stylesheet = args.SetStyleSheet;
}
else if (args.SetStyleSheetData != null)
{
stylesheetData = args.SetStyleSheetData;
}
else if (args.SetSrc != null)
{
stylesheet = LoadStylesheet(htmlContainer, args.SetSrc);
}
else
{
stylesheet = LoadStylesheet(htmlContainer, src);
}
}
catch (Exception ex)
{
htmlContainer.ReportError(HtmlRenderErrorType.CssParsing, "Exception in handling stylesheet source", ex);
}
}
protected override void OnStylesheetLoad(HtmlStylesheetLoadEventArgs e)
{
string styleSheetContent;
if (ChapterContent.StyleSheets.TryGetValue(e.Src, out styleSheetContent))
e.SetStyleSheet = styleSheetContent;
base.OnStylesheetLoad(e);
}
private void OnStylesheetLoad(object sender, HtmlStylesheetLoadEventArgs e)
{
OnStylesheetLoad(e);
}
/// <summary>
/// Propagate the stylesheet load event from root container.
/// </summary>
protected virtual void OnStylesheetLoad(HtmlStylesheetLoadEventArgs e)
{
var handler = StylesheetLoad;
if (handler != null)
handler(this, e);
}
/// <summary>
/// Raise the stylesheet load event with the given event args.
/// </summary>
/// <param name="args">the event args</param>
internal void RaiseHtmlStylesheetLoadEvent(HtmlStylesheetLoadEventArgs args)
{
try
{
EventHandler<HtmlStylesheetLoadEventArgs> handler = StylesheetLoad;
if (handler != null)
handler(this, args);
}
catch (Exception ex)
{
ReportError(HtmlRenderErrorType.CssParsing, "Failed stylesheet load event", ex);
}
}
private void OnStylesheetLoad(object sender, HtmlStylesheetLoadEventArgs e)
{
if (CheckAccess())
OnStylesheetLoad(e);
else
Dispatcher.Invoke(new Action<HtmlStylesheetLoadEventArgs>(OnStylesheetLoad), e);
}
/// <summary>
/// Propagate the stylesheet load event from root container.
/// </summary>
protected virtual void OnStylesheetLoad(HtmlStylesheetLoadEventArgs e)
{
RoutedEventArgs newEventArgs = new RoutedEvenArgs<HtmlStylesheetLoadEventArgs>(StylesheetLoadEvent, this, e);
RaiseEvent(newEventArgs);
}
/// <summary>
/// Raise the stylesheet load event with the given event args.
/// </summary>
/// <param name="args">the event args</param>
internal void RaiseHtmlStylesheetLoadEvent(HtmlStylesheetLoadEventArgs args)
{
try
{
if (StylesheetLoad != null)
{
StylesheetLoad(this, args);
}
}
catch (Exception ex)
{
ReportError(HtmlRenderErrorType.CssParsing, "Failed stylesheet load event", ex);
}
}
/// <summary>
/// Handle stylesheet resolve.
/// </summary>
public static void OnStylesheetLoad(object sender, HtmlStylesheetLoadEventArgs e)
{
var stylesheet = GetStylesheet(e.Src);
if (stylesheet != null)
e.SetStyleSheet = stylesheet;
}
