/// <summary>
/// Initializes a new instance of the <see cref="MarkdownDifferenceUpdater"/> class.
/// </summary>
/// <param name="oldSourceText">The previous version of the source text.</param>
/// <param name="oldDocument">The previous version of the parsed markdown document.</param>
/// <param name="pipeline">The markdown pipeline used to process the source text.</param>
/// <param name="styles">The markdown styles to be used for the rendering.</param>
/// <param name="imageProvider">The image provider.</param>
/// <param name="newSourceText">The new version of the source text.</param>
/// <param name="newSourceTextUsn">The serial number of the new source text.</param>
/// <param name="flowDocument">The flow document to render to.</param>
/// <param name="dispatcher">The dispatcher (used here to process some actions in Gui context).</param>
/// <param name="newDocumentSetter">
/// Action that is called at the end of the processing in Gui context. It is intended to set the new new document in the class that is calling this function.
/// The arguments are: i) the new source text, ii) the serial number of the new source text, and iii) the parsed markdown document.
/// </param>
/// <param name="setFlowDocumentUpdateInProgressFlag">
/// Action that is called in Gui context. It is intended to signal the class that is calling this function exactly when the flow document is updated.
/// This action is called twice: at the beginning of the update with the argument set to true, and at the end of the update with the argument set to false.
/// Argument is a flag that tells if the update of the flow document is in progress now.
/// </param>
/// <param name="cancellationToken">Cancellation token that can be used to cancel the update, e.g. if the user has entered new text.</param>
public MarkdownDifferenceUpdater(string oldSourceText, MarkdownDocument oldDocument, MarkdownPipeline pipeline, IStyles styles, IWpfImageProvider imageProvider, string newSourceText, long newSourceTextUsn, FlowDocument flowDocument, Dispatcher dispatcher, Action <string, long, MarkdownDocument> newDocumentSetter, Action <bool> setFlowDocumentUpdateInProgressFlag, CancellationToken cancellationToken)
{
OldSourceText = oldSourceText;
OldDocument = oldDocument;
Pipeline = pipeline;
Styles = styles;
ImageProvider = imageProvider;
NewSourceText = newSourceText;
NewSourceTextUsn = newSourceTextUsn;
FlowDocument = flowDocument;
Dispatcher = dispatcher;
NewTextAndDocumentSetter = newDocumentSetter;
SetFlowDocumentUpdateInProgressFlag = setFlowDocumentUpdateInProgressFlag;
_cancellationToken = cancellationToken;
}
/// <summary>
/// Initializes a new instance of the <see cref="LinkReferenceTrackerPostProcessor"/> class, and executes the post-processor
/// </summary>
/// <param name="document">The document.</param>
/// <param name="updateSequenceNumber">A number that is increased every time the source document changed.</param>
/// <param name="imageProvider">The image provider. Can be null (in this case nothing is tracked).</param>
public static void TrackLinks(MarkdownDocument document, long updateSequenceNumber, IWpfImageProvider imageProvider)
{
var urlCollector = imageProvider?.CreateUrlCollector();
if (null != urlCollector)
{
foreach (var element in PositionHelper.EnumerateAllMarkdownObjectsRecursively(document))
{
if (element is LinkInline linkInline)
{
if (linkInline.UrlSpan.HasValue)
{
urlCollector.AddUrl(linkInline.IsImage, linkInline.Url, linkInline.UrlSpan.Value.Start, linkInline.UrlSpan.Value.End);
}
}
}
urlCollector.Freeze(); // announce that the collection proccess has finished
imageProvider.UpdateUrlCollector(urlCollector, updateSequenceNumber);
}
}
/// <summary>
/// Converts a list of (top level) <see cref="MarkdownObject"/>s to a list of (top level) <see cref="TextElement"/>s.
/// </summary>
/// <param name="markdownObjects">List of top level markdown objects.</param>
/// <param name="pipeline">The pipeline used for the conversion.</param>
/// <returns>The list of (top level) <see cref="TextElement"/>s as the result of the conversion.</returns>
/// <exception cref="System.ArgumentNullException">if markdown variable is null</exception>
public static IList <TextElement> ListOfMarkdownObjectsToListOfTextElements(IList <MarkdownObject> markdownObjects, MarkdownPipeline pipeline, IStyles styles, IWpfImageProvider imageProvider)
{
var p = new Paragraph();
styles.ApplyParagraphStyle(p);
var result = new TextElementList()
{
FontSize = p.FontSize
};
var renderer = new Markdig.Renderers.WpfRenderer(result, styles)
{
ImageProvider = imageProvider
};
pipeline.Setup(renderer);
renderer.Render(markdownObjects);
return(result);
}
