public static int GenerateNewId(VisualTreeAsset vta, VisualElementAsset vea)
{
int parentHash;
if (!vea.HasParent())
{
parentHash = vta.GetHashCode();
}
else
{
parentHash = vea.parentId;
}
var guid = System.Guid.NewGuid().GetHashCode();
return((vta.GetNextChildSerialNumber() + 585386304) * -1521134295 + parentHash + guid);
}
int GetRecursiveHashCode(VisualTreeAsset vta)
{
int hashCode;
#if UNITY_2020_1_OR_NEWER
unchecked
{
hashCode = vta.contentHash;
// When an attribute is edited, we need to recreate the whole UI
// since UIElements has no way to update existing VisualElements
// from the asset.
hashCode = (hashCode * 397) ^ EditorUtility.GetDirtyCount(vta);
foreach (var asset in vta.templateDependencies)
{
hashCode = (hashCode * 397) ^ GetRecursiveHashCode(asset);
}
foreach (var asset in vta.stylesheets)
{
if (asset != null)
{
hashCode = (hashCode * 397) ^ asset.contentHash;
hashCode = (hashCode * 397) ^ EditorUtility.GetDirtyCount(asset);
}
}
}
#else
unchecked
{
hashCode = vta.GetHashCode();
// When an attribute is edited, we need to recreate the whole UI
// since UIElements has no way to update existing VisualElements
// from the asset.
hashCode = (hashCode * 397) ^ EditorUtility.GetDirtyCount(vta);
// We can't detect changes to sub-UXML files (referenced templates) in 2019.3
// We can't detect external content change to stylesheets in 2019.3
}
#endif
return(hashCode);
}
void LoadXml(XElement elt, VisualElementAsset parent, VisualTreeAsset vta, int orderInDocument)
{
VisualElementAsset vea = ResolveType(elt, vta);
if (vea == null)
{
return;
}
int parentHash;
if (parent == null)
{
vea.parentId = 0;
parentHash = vta.GetHashCode();
}
else
{
vea.parentId = parent.id;
parentHash = parent.id;
}
// id includes the parent id, meaning it's dependent on the whole direct hierarchy
vea.id = (vta.GetNextChildSerialNumber() + 585386304) * -1521134295 + parentHash;
vea.orderInDocument = orderInDocument;
bool startedRule = ParseAttributes(elt, vea, vta, parent);
// each vea will creates 0 or 1 style rule, with one or more properties
// they don't have selectors and are directly referenced by index
// it's then applied during tree cloning
vea.ruleIndex = startedRule ? m_Builder.EndRule() : -1;
var templateAsset = vea as TemplateAsset;
if (templateAsset != null)
{
vta.templateAssets.Add(templateAsset);
}
else
{
vta.visualElementAssets.Add(vea);
}
if (elt.HasElements)
{
foreach (XElement child in elt.Elements())
{
if (child.Name.LocalName == k_StyleReferenceNode)
{
LoadStyleReferenceNode(vea, child);
}
else if (templateAsset != null && child.Name.LocalName == k_AttributeOverridesNode)
{
LoadAttributeOverridesNode(templateAsset, child);
}
else
{
++orderInDocument;
LoadXml(child, vea, vta, orderInDocument);
}
}
}
}
