private void Initialize(UIElement root, UIElement element, UIElement innerContext)
{
this.root = root;
this.element = element;
this.innerContext = innerContext;
element.bindingNode = this;
this.lastBeforeUpdateFrame = default;
this.lastAfterUpdateFrame = default;
this.createdBinding = default;
this.enabledBinding = default;
this.updateBindings = default;
this.lateBindings = default;
this.localVariable = default;
this.parent = default;
this.referencedContexts = default;
}
public ContextVariable GetContextVariable(int id)
{
ContextVariable ptr = localVariable;
while (ptr != null)
{
if (ptr.id == id)
{
return(ptr.reference ?? ptr);
}
ptr = ptr.next;
}
// if didnt find a local variable, start a search upwards
// if found, reference locally. should only hit this once
if (parent == null)
{
UIElement elemPtr = element.parent;
while (elemPtr != null)
{
if (elemPtr.bindingNode != null)
{
parent = elemPtr.bindingNode;
break;
}
elemPtr = elemPtr.parent;
}
}
ContextVariable value = parent?.GetContextVariable(id);
// it is technically an error if we can't find the context variable, something went wrong with compilation
Debug.Assert(value != null, nameof(value) + " != null");
value = value.CreateReference();
CreateLocalContextVariable(value);
return(value);
}
public void CreateLocalContextVariable(ContextVariable variable)
{
if (localVariable == null)
{
localVariable = variable;
return;
}
ContextVariable ptr = localVariable;
while (true)
{
if (ptr.next == null)
{
ptr.next = variable;
return;
}
ptr = ptr.next;
}
}