private int CountVisibleElements(IHTMLElement node)
{
if (node == null)
{
return(0);
}
int count = 0;
IHTMLElementCollection all = (IHTMLElementCollection)node.all;
foreach (IHTMLElement child in all)
{
if (ElementFilters.IsVisibleEmptyElement(child))
{
count++;
}
}
return(count);
}
/// <summary>
/// Returns true if shift+tab focused region changing is supported for the current edit location
/// </summary>
/// <returns></returns>
private bool ShiftTabFocusChangeSupported()
{
//Shift-tab is only supported if the caret is positioned at the beginning of the post
//If the selection is currently inside a non-blockquote block element with no visible content
//to the left of it, then focus change is supported.
if (!EditorContext.Selection.SelectedMarkupRange.IsEmpty())
{
return(false);
}
MarkupRange range = ElementRange.Clone();
range.Start.MoveAdjacentToElement(HTMLElement, _ELEMENT_ADJACENCY.ELEM_ADJ_AfterBegin);
range.End = EditorContext.Selection.SelectedMarkupRange.Start;
//if there is any text between the caret and the beginning of the post,
//then ShiftTab focus changing is not allowed.
string text = range.Text;
if (text != null && range.Text.Trim() != String.Empty)
{
return(false);
}
MarkupContext context = new MarkupContext();
range.Start.Right(true, context);
int blockElementDepth = 0;
while (range.Start.IsLeftOfOrEqualTo(range.End))
{
if (context.Context == _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_EnterScope || context.Context == _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_NoScope)
{
string tagName = context.Element.tagName;
if (tagName.Equals("BLOCKQUOTE") || ElementFilters.IsListElement(context.Element) || ElementFilters.IsListItemElement(context.Element))
{
return(false); //ShiftTab in a blockquote or list implies "un-blockquote" or "un-list"
}
else if (ElementFilters.IsBlockElement(context.Element))
{
blockElementDepth++;
if (blockElementDepth > 1)
{
return(false); //there are multiple block elements, so this is not the beginning
}
}
else if (ElementFilters.IsVisibleEmptyElement(context.Element))
{
return(false); //there is a visible empty element (like an image), so this is not the beginning
}
}
else if (context.Context == _MARKUP_CONTEXT_TYPE.CONTEXT_TYPE_ExitScope)
{
if (ElementFilters.IsVisibleEmptyElement(context.Element))
{
return(false); //there is a visible empty element (like an image), so this is not the beginning
}
}
range.Start.Right(true, context);
}
return(true);
}
