/// <summary>
/// This method iterates recursively through the <see cref="HtmlWindowCollection"/>
/// of a webbrowser document get the maximal scroll size of the containing frames.
/// </summary>
/// <param name="htmlWindows">
/// The first <see cref="HtmlWindowCollection"/>
/// to start parsing. You get it from browser.Document.Window.Frames
/// </param>
/// <param name="currentScrollsize">
/// Ref. A <see cref="Size"/> to be updated with
/// maximal scroll size values.
/// </param>
private static void GetLargestScrollSizeOfAllFrames(HtmlWindowCollection htmlWindows, ref Size currentScrollsize)
{
foreach (HtmlWindow window in htmlWindows)
{
try
{
HtmlDocument document = window.Document;
if (document == null)
{
continue;
}
GetMaxScrollSizeOfDocument(document, ref currentScrollsize);
if (document.Window != null)
{
GetLargestScrollSizeOfAllFrames(document.Window.Frames, ref currentScrollsize);
}
}
catch (UnauthorizedAccessException ex)
{
ExceptionMethods.HandleExceptionSilent(ex);
}
}
}
/// <summary>
/// This method iterates recursively through the <see cref="HtmlWindowCollection"/>
/// of a web browser Document to attach the mouse down event for all
/// frames, if there are multiple.
/// </summary>
/// <param name="htmlWindows">
/// The first <see cref="HtmlWindowCollection"/>
/// to start parsing. You get it from browser.Document.Window.Frames
/// </param>
private void AttachEventHandlerForFrames(HtmlWindowCollection htmlWindows)
{
foreach (HtmlWindow window in htmlWindows)
{
try
{
window.AttachEventHandler("onscroll", this.WebBrowserScroll);
if (window.Document != null)
{
window.Document.MouseDown -= this.WebBrowserMouseDown;
window.Document.MouseDown += this.WebBrowserMouseDown;
if (window.Document.Window != null)
{
this.AttachEventHandlerForFrames(window.Document.Window.Frames);
}
}
}
catch (UnauthorizedAccessException)
{
// Ignore cross domain access exceptions
// the workaround would need to use mshtml which is
// not easy...
}
}
}