/// <summary>
/// Collect the aggregated style properties of the given element within its context
/// </summary>
/// <param name="element">A page element, T or OE, or an embedd span from a CDATA wrapper</param>
/// <param name="nested">True to look down the hierarchy as well as up</param>
/// <returns>A StyleProperties collection</returns>
public StyleProperties CollectFrom(XElement element, bool nested = false)
{
var id = element.Attribute("objectID")?.Value;
if (id != null && catalog.ContainsKey(id))
{
Hits++;
return(catalog[id]);
}
var properties = new StyleProperties();
if (element.Name.LocalName == "span")
{
// wrapped CDATA so no connected parent/ancestor to backtrack
properties.Add(element.CollectStyleProperties(false));
}
else if (element.Name.LocalName == "T")
{
properties.Add(element.CollectStyleProperties(nested));
properties.Add(CollectFromParagraph(element.Parent));
}
else if (element.Name.LocalName == "OE")
{
properties.Add(CollectFromParagraph(element));
}
if (id != null && !catalog.ContainsKey(id))
{
catalog.Add(id, properties);
}
return(properties);
}
private StyleProperties CollectFromQuickStyle(XElement element)
{
var index = element.Attribute("quickStyleIndex")?.Value;
if (index != null)
{
var key = $"quick-{index}";
if (catalog.ContainsKey(key))
{
Hits++;
return(catalog[key]);
}
var quick = root.Elements(ns + "QuickStyleDef")
.FirstOrDefault(e => e.Attribute("index").Value.Equals(index));
if (quick != null)
{
var props = new StyleProperties();
QuickStyleDef.CollectStyleProperties(quick, props);
catalog.Add(key, props);
return(props);
}
}
return(new StyleProperties());
}
/// <summary>
/// Infers the style of the selected text on a page. If more than one style is
/// included in the selected region then only the first style is returned
/// </summary>
public Style CollectFromSelection()
{
var runs = root.Descendants(ns + "T")
.Where(e => e.Attribute("selected")?.Value == "all");
if (runs == null || !runs.Any())
{
// nothing selected
return(null);
}
var properties = new StyleProperties();
var selection = runs.First();
var cdata = selection.GetCData();
if (!cdata.IsEmpty() || runs.Count() > 1)
{
// collect from first if one non-empty or more than one run is selected
properties.Add(CollectFrom(selection, true));
}
else if (cdata.IsEmpty())
{
// is cursor adjacent to a previous non-empty run?
if ((selection.PreviousNode is XElement prev) &&
(prev.GetCData() is XCData pdata) && !pdata.EndsWithWhitespace())
{
// if last node is a SPAN then examine its style
var wrapper = pdata.GetWrapper();
if (wrapper.Nodes().Last() is XElement span && span.Attribute("style") != null)
{
properties.Add(CollectFrom(span));
}
}
else if ((selection.NextNode is XElement next) &&
(next.GetCData() is XCData ndata) && !ndata.StartsWithWhitespace())
{
// if first node is a SPAN then examine its style
var wrapper = ndata.GetWrapper();
if (wrapper.Nodes().First() is XElement span && span.Attribute("style") != null)
{
properties.Add(CollectFrom(span));
}
}
private StyleProperties CollectFromParagraph(XElement paragraph)
{
var id = paragraph.Attribute("objectID")?.Value;
if (id != null && catalog.ContainsKey(id))
{
Hits++;
return(catalog[id]);
}
var properties = new StyleProperties
{
paragraph.CollectStyleProperties(nested: false),
CollectFromQuickStyle(paragraph)
};
if (id != null)
{
catalog.Add(id, properties);
}
return(properties);
}
