private IEnumerable <ModernFrame> GetChildFrames()
{
var refs = this.childFrames.ToArray();
foreach (var r in refs)
{
var valid = false;
ModernFrame frame;
#if NET4
if (r.IsAlive)
{
frame = (ModernFrame)r.Target;
#else
if (r.TryGetTarget(out frame))
{
#endif
// check if frame is still an actual child (not the case when child is removed, but not yet garbage collected)
if (NavigationHelper.FindFrame(null, frame) == this)
{
valid = true;
yield return(frame);
}
}
if (!valid)
{
this.childFrames.Remove(r);
}
}
}
private void OnLoaded(object sender, RoutedEventArgs e)
{
var parent = NavigationHelper.FindFrame(NavigationHelper.FrameParent, this);
if (parent != null)
{
parent.RegisterChildFrame(this);
}
}
/// <summary>
/// Performs navigation to specified link.
/// </summary>
/// <param name="uri">The uri to navigate to.</param>
/// <param name="source">The source element that triggers the navigation. Required for frame navigation.</param>
/// <param name="parameter">An optional command parameter or navigation target.</param>
public virtual void Navigate(Uri uri, FrameworkElement source = null, string parameter = null)
{
if (uri == null)
{
throw new ArgumentNullException("uri");
}
// first check if uri refers to a command
ICommand command;
if (this.commands != null && this.commands.TryGetValue(uri, out command))
{
// note: not executed within BBCodeBlock context, Hyperlink instance has Command and CommandParameter set
if (command.CanExecute(parameter))
{
command.Execute(parameter);
}
else
{
// do nothing
}
}
else if (uri.IsAbsoluteUri && this.externalSchemes != null && this.externalSchemes.Any(s => uri.Scheme.Equals(s, StringComparison.OrdinalIgnoreCase)))
{
// uri is external, load in default browser
Process.Start(uri.AbsoluteUri);
return;
}
else
{
// perform frame navigation
if (source == null) // source required
{
throw new ArgumentException(string.Format(CultureInfo.CurrentUICulture, Resources.NavigationFailedSourceNotSpecified, uri));
}
// use optional parameter as navigation target to identify target frame (_self, _parent, _top or named target frame)
var frame = NavigationHelper.FindFrame(parameter, source);
if (frame == null)
{
throw new ArgumentException(string.Format(CultureInfo.CurrentUICulture, Resources.NavigationFailedFrameNotFound, uri, parameter));
}
// delegate navigation to the frame
frame.Source = uri;
}
}
