public void PreviewMarkdown(MarkdownDocumentEditor editor = null, bool keepScrollPosition = false,
bool showInBrowser = false)
{
try
{
// only render if the preview is actually visible and rendering in Preview Browser
if (!Model.IsPreviewBrowserVisible && !showInBrowser)
{
return;
}
if (editor == null)
{
editor = Window.GetActiveMarkdownEditor();
}
if (editor == null)
{
return;
}
var doc = editor.MarkdownDocument;
var ext = Path.GetExtension(doc.Filename).ToLower().Replace(".", "");
string renderedHtml = null;
// only show preview for Markdown and HTML documents
Model.Configuration.EditorExtensionMappings.TryGetValue(ext, out string mappedTo);
mappedTo = mappedTo ?? string.Empty;
if (string.IsNullOrEmpty(ext) || mappedTo == "markdown" || mappedTo == "html")
{
dynamic dom = null;
if (!showInBrowser)
{
if (keepScrollPosition)
{
dom = WebBrowser.Document;
editor.MarkdownDocument.LastEditorLineNumber = dom.documentElement.scrollTop;
}
else
{
Window.ShowPreviewBrowser(false, false);
editor.MarkdownDocument.LastEditorLineNumber = 0;
}
}
if (mappedTo == "html")
{
if (!editor.MarkdownDocument.WriteFile(editor.MarkdownDocument.HtmlRenderFilename,
editor.MarkdownDocument.CurrentText))
{
// need a way to clear browser window
return;
}
}
else
{
bool usePragma = !showInBrowser && mmApp.Configuration.PreviewSyncMode != PreviewSyncMode.None;
renderedHtml = editor.MarkdownDocument.RenderHtmlToFile(usePragmaLines: usePragma,
renderLinksExternal: mmApp.Configuration.MarkdownOptions.RenderLinksAsExternal);
if (renderedHtml == null)
{
Window.SetStatusIcon(FontAwesomeIcon.Warning, Colors.Red, false);
Window.ShowStatus($"Access denied: {Path.GetFileName(editor.MarkdownDocument.Filename)}", 5000);
// need a way to clear browser window
return;
}
renderedHtml = StringUtils.ExtractString(renderedHtml,
"<!-- Markdown Monster Content -->",
"<!-- End Markdown Monster Content -->");
}
if (showInBrowser)
{
var url = editor.MarkdownDocument.HtmlRenderFilename;
mmFileUtils.ShowExternalBrowser(url);
return;
}
else
{
WebBrowser.Cursor = Cursors.None;
WebBrowser.ForceCursor = true;
// if content contains <script> tags we must do a full page refresh
bool forceRefresh = renderedHtml != null && renderedHtml.Contains("<script ");
if (keepScrollPosition && !mmApp.Configuration.AlwaysUsePreviewRefresh && !forceRefresh)
{
string browserUrl = WebBrowser.Source.ToString().ToLower();
string documentFile = "file:///" +
editor.MarkdownDocument.HtmlRenderFilename.Replace('\\', '/')
.ToLower();
if (browserUrl == documentFile)
{
dom = WebBrowser.Document;
//var content = dom.getElementById("MainContent");
if (string.IsNullOrEmpty(renderedHtml))
{
PreviewMarkdown(editor, false, false); // fully reload document
}
else
{
try
{
// explicitly update the document with JavaScript code
// much more efficient and non-jumpy and no wait cursor
var window = dom.parentWindow;
window.updateDocumentContent(renderedHtml);
try
{
// scroll preview to selected line
if (mmApp.Configuration.PreviewSyncMode == PreviewSyncMode.EditorAndPreview ||
mmApp.Configuration.PreviewSyncMode == PreviewSyncMode.EditorToPreview)
{
int lineno = editor.GetLineNumber();
if (lineno > -1)
{
window.scrollToPragmaLine(lineno);
}
}
}
catch
{
/* ignore scroll error */
}
}
catch
{
// Refresh doesn't fire Navigate event again so
// the page is not getting initiallized properly
//PreviewBrowser.Refresh(true);
WebBrowser.Tag = "EDITORSCROLL";
WebBrowser.Navigate(new Uri(editor.MarkdownDocument.HtmlRenderFilename));
}
}
return;
}
}
WebBrowser.Tag = "EDITORSCROLL";
WebBrowser.Navigate(new Uri(editor.MarkdownDocument.HtmlRenderFilename));
return;
}
}
// not a markdown or HTML document to preview
Window.ShowPreviewBrowser(true, keepScrollPosition);
}
catch (Exception ex)
{
mmApp.Log("PreviewMarkdown failed (Exception captured - continuing)", ex);
}
}
private void PreviewBrowserOnLoadCompleted(object sender, NavigationEventArgs e)
{
string url = e.Uri.ToString();
if (!url.Contains("_MarkdownMonster_Preview"))
{
return;
}
bool shouldScrollToEditor = WebBrowser.Tag != null && WebBrowser.Tag.ToString() == "EDITORSCROLL";
WebBrowser.Tag = null;
dynamic window = null;
MarkdownDocumentEditor editor = null;
try
{
editor = Window.GetActiveMarkdownEditor();
dynamic dom = WebBrowser.Document;
window = dom.parentWindow;
dom.documentElement.scrollTop = editor.MarkdownDocument.LastEditorLineNumber;
window.initializeinterop(editor);
if (shouldScrollToEditor)
{
try
{
// scroll preview to selected line
if (mmApp.Configuration.PreviewSyncMode == PreviewSyncMode.EditorAndPreview ||
mmApp.Configuration.PreviewSyncMode == PreviewSyncMode.EditorToPreview)
{
int lineno = editor.GetLineNumber();
if (lineno > -1)
{
window.scrollToPragmaLine(lineno);
}
}
}
catch
{
/* ignore scroll error */
}
}
}
catch
{
// try again
Task.Delay(500).ContinueWith(t =>
{
try
{
window.initializeinterop(editor);
}
catch
{
//mmApp.Log("Preview InitializeInterop failed: " + url, ex);
}
});
}
}
