/// <summary>
/// Finds a BeginStoryboard with the given name, following the rules
/// governing Storyboard. Returns null if not found.
/// </summary>
/// <remarks>
/// If a name scope is given, look there and nowhere else. In the
/// absense of name scope, use Framework(Content)Element.FindName which
/// has its own complex set of rules for looking up name scopes.
///
/// This is a different set of rules than from that used to look up
/// the TargetName. BeginStoryboard name is registered with the template
/// INameScope on a per-template basis. So we look it up using
/// INameScope.FindName(). This is a function completely different from
/// Template.FindName().
/// </remarks>
internal static BeginStoryboard ResolveBeginStoryboardName(
string targetName,
INameScope nameScope,
FrameworkElement fe,
FrameworkContentElement fce)
{
object namedObject = null;
BeginStoryboard beginStoryboard = null;
if( nameScope != null )
{
namedObject = nameScope.FindName(targetName);
if( namedObject == null )
{
throw new InvalidOperationException(
SR.Get(SRID.Storyboard_NameNotFound, targetName, nameScope.GetType().ToString()));
}
}
else if( fe != null )
{
namedObject = fe.FindName(targetName);
if( namedObject == null )
{
throw new InvalidOperationException(
SR.Get(SRID.Storyboard_NameNotFound, targetName, fe.GetType().ToString()));
}
}
else if( fce != null )
{
namedObject = fce.FindName(targetName);
if( namedObject == null )
{
throw new InvalidOperationException(
SR.Get(SRID.Storyboard_NameNotFound, targetName, fce.GetType().ToString()));
}
}
else
{
throw new InvalidOperationException(
SR.Get(SRID.Storyboard_NoNameScope, targetName));
}
beginStoryboard = namedObject as BeginStoryboard;
if( beginStoryboard == null )
{
throw new InvalidOperationException(SR.Get(SRID.Storyboard_BeginStoryboardNameNotFound, targetName));
}
return beginStoryboard;
}