static VisualElement CloneSetupRecursively(VisualTreeAsset vta, VisualElementAsset root,
Dictionary <int, List <VisualElementAsset> > idToChildren, CreationContext context)
{
var ve = VisualTreeAsset.Create(root, context);
// Linking the new element with its VisualElementAsset.
// All this copied code for this one line!
ve.SetVisualElementAsset(root);
ve.SetProperty(BuilderConstants.ElementLinkedBelongingVisualTreeAssetVEPropertyName, vta);
// context.target is the created templateContainer
if (root.id == context.visualTreeAsset.contentContainerId)
{
if (context.target is TemplateContainer)
{
((TemplateContainer)context.target).SetContentContainer(ve);
}
else
{
Debug.LogError(
"Trying to clone a VisualTreeAsset with a custom content container into a element which is not a template container");
}
}
// if the current element had a slot-name attribute, put it in the resulting slot mapping
string slotName;
if (context.slotInsertionPoints != null && vta.TryGetSlotInsertionPoint(root.id, out slotName))
{
context.slotInsertionPoints.Add(slotName, ve);
}
if (root.classes != null)
{
for (int i = 0; i < root.classes.Length; i++)
{
ve.AddToClassList(root.classes[i]);
}
}
if (root.ruleIndex != -1)
{
if (vta.inlineSheet == null)
{
Debug.LogWarning("VisualElementAsset has a RuleIndex but no inlineStyleSheet");
}
else
{
var rule = vta.inlineSheet.rules[root.ruleIndex];
ve.UpdateInlineRule(vta.inlineSheet, rule);
}
}
var templateAsset = root as TemplateAsset;
if (templateAsset != null)
{
var templatePath = vta.GetPathFromTemplateName(templateAsset.templateAlias);
ve.SetProperty(BuilderConstants.LibraryItemLinkedTemplateContainerPathVEPropertyName, templatePath);
var instancedTemplateVTA = vta.ResolveTemplate(templateAsset.templateAlias);
if (instancedTemplateVTA != null)
{
ve.SetProperty(BuilderConstants.ElementLinkedInstancedVisualTreeAssetVEPropertyName, instancedTemplateVTA);
}
}
List <VisualElementAsset> children;
if (idToChildren.TryGetValue(root.id, out children))
{
children.Sort(VisualTreeAssetUtilities.CompareForOrder);
foreach (VisualElementAsset childVea in children)
{
if (childVea is UxmlObjectAsset)
{
continue;
}
// this will fill the slotInsertionPoints mapping
var childVe = CloneSetupRecursively(vta, childVea, idToChildren, context);
if (childVe == null)
{
continue;
}
// if the parent is not a template asset, just add the child to whatever hierarchy we currently have
// if ve is a scrollView (with contentViewport as contentContainer), this will go to the right place
if (templateAsset == null)
{
ve.Add(childVe);
continue;
}
int index = templateAsset.slotUsages == null
? -1
: templateAsset.slotUsages.FindIndex(u => u.assetId == childVea.id);
if (index != -1)
{
VisualElement parentSlot;
string key = templateAsset.slotUsages[index].slotName;
Assert.IsFalse(String.IsNullOrEmpty(key),
"a lost name should not be null or empty, this probably points to an importer or serialization bug");
if (context.slotInsertionPoints == null ||
!context.slotInsertionPoints.TryGetValue(key, out parentSlot))
{
Debug.LogErrorFormat("Slot '{0}' was not found. Existing slots: {1}", key,
context.slotInsertionPoints == null
? String.Empty
: String.Join(", ",
System.Linq.Enumerable.ToArray(context.slotInsertionPoints.Keys)));
ve.Add(childVe);
}
else
{
parentSlot.Add(childVe);
}
}
else
{
ve.Add(childVe);
}
}
}
if (templateAsset != null && context.slotInsertionPoints != null)
{
context.slotInsertionPoints.Clear();
}
return(ve);
}
static VisualElement CloneSetupRecursively(VisualTreeAsset vta, VisualElementAsset root,
Dictionary <int, List <VisualElementAsset> > idToChildren, CreationContext context)
{
// This is needed because of asset reloads during domain reloads where the
// stylesheet path might be a temporary instance id to a pure in-memory stylesheet.
List <string> originalStyleSheets = null;
#if UNITY_2019_3_OR_NEWER
if (root.stylesheetPaths != null && root.stylesheetPaths.Count > 0)
#else
if (root.stylesheets != null && root.stylesheets.Count > 0)
#endif
{
originalStyleSheets = root.GetStyleSheetPaths();
var strippedList = originalStyleSheets.Where(
(s) => !s.StartsWith(BuilderConstants.VisualTreeAssetStyleSheetPathAsInstanceIdSchemeName));
#if UNITY_2019_3_OR_NEWER
root.stylesheetPaths = strippedList.ToList();
#else
root.stylesheets = strippedList.ToList();
#endif
}
#if UNITY_2019_3_OR_NEWER
var resolvedSheets = new List <StyleSheet>();
foreach (var sheetPath in root.stylesheetPaths)
{
resolvedSheets.Add(AssetDatabase.LoadAssetAtPath <StyleSheet>(sheetPath));
}
root.stylesheets = resolvedSheets;
#endif
var ve = VisualTreeAsset.Create(root, context);
// Restore stylesheets.
if (originalStyleSheets != null)
#if UNITY_2019_3_OR_NEWER
{ root.stylesheetPaths = originalStyleSheets; }
#else
{ root.stylesheets = originalStyleSheets; }
#endif
// Linking the new element with its VisualElementAsset.
// All this copied code for this one line!
ve.SetProperty(BuilderConstants.ElementLinkedVisualElementAssetVEPropertyName, root);
// context.target is the created templateContainer
if (root.id == context.visualTreeAsset.contentContainerId)
{
if (context.target is TemplateContainer)
{
((TemplateContainer)context.target).SetContentContainer(ve);
}
else
{
Debug.LogError(
"Trying to clone a VisualTreeAsset with a custom content container into a element which is not a template container");
}
}
// if the current element had a slot-name attribute, put it in the resulting slot mapping
string slotName;
if (context.slotInsertionPoints != null && vta.TryGetSlotInsertionPoint(root.id, out slotName))
{
context.slotInsertionPoints.Add(slotName, ve);
}
if (root.classes != null)
{
for (int i = 0; i < root.classes.Length; i++)
{
ve.AddToClassList(root.classes[i]);
}
}
if (root.ruleIndex != -1)
{
if (vta.inlineSheet == null)
{
Debug.LogWarning("VisualElementAsset has a RuleIndex but no inlineStyleSheet");
}
else
{
var rule = vta.inlineSheet.rules[root.ruleIndex];
#if UNITY_2020_1_OR_NEWER
ve.SetInlineRule(vta.inlineSheet, rule);
#elif UNITY_2019_3_OR_NEWER
var stylesData = new VisualElementStylesData(false);
ve.SetInlineStyles(stylesData);
s_StylePropertyReader.SetInlineContext(vta.inlineSheet, rule, root.ruleIndex);
stylesData.ApplyProperties(s_StylePropertyReader, null);
#else
var stylesData = new VisualElementStylesData(false);
ve.SetInlineStyles(stylesData);
var propIds = StyleSheetCache.GetPropertyIDs(vta.inlineSheet, root.ruleIndex);
stylesData.ApplyRule(vta.inlineSheet, Int32.MaxValue, rule, propIds);
#endif
}
}
var templateAsset = root as TemplateAsset;
if (templateAsset != null)
{
var templatePath = vta.GetPathFromTemplateName(templateAsset.templateAlias);
ve.SetProperty(BuilderConstants.LibraryItemLinkedTemplateContainerPathVEPropertyName, templatePath);
}
List <VisualElementAsset> children;
if (idToChildren.TryGetValue(root.id, out children))
{
children.Sort(VisualTreeAssetUtilities.CompareForOrder);
foreach (VisualElementAsset childVea in children)
{
// this will fill the slotInsertionPoints mapping
VisualElement childVe = CloneSetupRecursively(vta, childVea, idToChildren, context);
if (childVe == null)
{
continue;
}
// if the parent is not a template asset, just add the child to whatever hierarchy we currently have
// if ve is a scrollView (with contentViewport as contentContainer), this will go to the right place
if (templateAsset == null)
{
ve.Add(childVe);
continue;
}
int index = templateAsset.slotUsages == null
? -1
: templateAsset.slotUsages.FindIndex(u => u.assetId == childVea.id);
if (index != -1)
{
VisualElement parentSlot;
string key = templateAsset.slotUsages[index].slotName;
Assert.IsFalse(String.IsNullOrEmpty(key),
"a lost name should not be null or empty, this probably points to an importer or serialization bug");
if (context.slotInsertionPoints == null ||
!context.slotInsertionPoints.TryGetValue(key, out parentSlot))
{
Debug.LogErrorFormat("Slot '{0}' was not found. Existing slots: {1}", key,
context.slotInsertionPoints == null
? String.Empty
: String.Join(", ",
System.Linq.Enumerable.ToArray(context.slotInsertionPoints.Keys)));
ve.Add(childVe);
}
else
{
parentSlot.Add(childVe);
}
}
else
{
ve.Add(childVe);
}
}
}
if (templateAsset != null && context.slotInsertionPoints != null)
{
context.slotInsertionPoints.Clear();
}
return(ve);
}