/// <summary>Handle navigation events</summary>
private void HandleNavigating(object sender, WebBrowserNavigatingEventArgs args)
{
// Ignore recursive calls (and navigation events that happen after
// this method returns but are due to the assignment of DocumentStream)
if (m_rdr_content || args.Url == AboutBlankUrl)
{
return;
}
using (Scope.Create(() => m_rdr_content = true, () => m_rdr_content = false))
{
var idx = UrlHistory.Position + 1;
// Add the selected URL to the history
if (idx == UrlHistory.Count)
{
// Resolve the URL to content
var a = new ResolveContentEventArgs(args.Url);
OnResolveContent(a);
// Add to the history
UrlHistory.Add(new Visit(a.Url, a.Content));
}
else if (!m_fwd_or_back || args.Url != UrlHistory[idx].Url)
{
// Resolve the URL to content
var a = new ResolveContentEventArgs(args.Url);
OnResolveContent(a);
// Set the current visit and remove the future history
UrlHistory[idx] = new Visit(a.Url, a.Content);
m_url_history.RemoveToEnd(idx + 1);
}
UrlHistory.Position = idx;
// Display the content
var content = UrlHistory.Current.Content;
if (content != null)
{
// Setting DocumentStream is considered a navigation (to about:blank)
// This may or may not result in a recursive call to this method
m_wb.DocumentStream = new MemoryStream(Encoding.UTF8.GetBytes(content));
args.Cancel = true;
}
m_fwd_or_back = false;
}
System.Diagnostics.Debug.WriteLine($"{UrlHistory.Position} : {string.Join("->", UrlHistory.Select(x => x.Url.ToString()))}");
}
protected virtual void OnResolveContent(ResolveContentEventArgs args)
{
ResolveContent?.Invoke(this, args);
}
