/// <summary>
/// Returns true if this range is composes entirely of non-visible elements.
/// </summary>
/// <param name="inScopeContextsOnly">flag to ignore out of scope element
/// (use false unless you absolutely want to ignore visible content in cases like
/// [start]<p>[end]</p>)</param>
/// <returns></returns>
public bool IsEmptyOfContent(bool inScopeContextsOnly)
{
try
{
bool isEmptyOfContent = true;
WalkRange(
delegate(MarkupRange currentRange, MarkupContext context, string text)
{
text = text ?? string.Empty;
if (!String.IsNullOrEmpty(text.Trim()))
{
isEmptyOfContent = false;
return(false);
}
if (context.Element != null && ElementFilters.IsVisibleEmptyElement(context.Element))
{
isEmptyOfContent = false;
return(false);
}
// Continue walking the range.
return(true);
},
inScopeContextsOnly);
return(isEmptyOfContent);
}
catch (Exception)
{
return(false);
}
}
private static MoveFilterResult StopBeforeVisible(MarkupContext mc)
{
if (mc.Context == _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_Text)
{
return(MoveFilterResult.STOP_BACK);
}
if (mc.Element != null && ElementFilters.IsInlineElement(mc.Element) && !ElementFilters.IsVisibleEmptyElement(mc.Element))
{
return(MoveFilterResult.CONTINUE);
}
return(MoveFilterResult.STOP_BACK);
}