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using System.Collections.Generic;
using Microsoft.Maui.Controls.Internals;
namespace Microsoft.Maui.Controls.Xaml
{
class NamescopingVisitor : IXamlNodeVisitor
{
readonly Dictionary<INode, NameScopeRef> _scopes = new Dictionary<INode, NameScopeRef>();
public NamescopingVisitor(HydrationContext context)
{
}
public TreeVisitingMode VisitingMode => TreeVisitingMode.TopDown;
public bool StopOnDataTemplate => false;
public bool StopOnResourceDictionary => false;
public bool VisitNodeOnDataTemplate => true;
public bool SkipChildren(INode node, INode parentNode) => false;
public bool IsResourceDictionary(ElementNode node) => false;
public void Visit(ValueNode node, INode parentNode) => _scopes[node] = _scopes[parentNode];
public void Visit(MarkupNode node, INode parentNode) => _scopes[node] = _scopes[parentNode];
public void Visit(ElementNode node, INode parentNode)
=> _scopes[node] = node.NameScopeRef = (parentNode == null || IsDataTemplate(node, parentNode) || IsStyle(node, parentNode) || IsVisualStateGroupList(node))
? new NameScopeRef { NameScope = new NameScope() }
: _scopes[parentNode];
public void Visit(RootNode node, INode parentNode) => _scopes[node] = node.NameScopeRef = new NameScopeRef { NameScope = new NameScope() };
public void Visit(ListNode node, INode parentNode) =>
_scopes[node] = _scopes[parentNode];
static bool IsDataTemplate(INode node, INode parentNode)
{
if (parentNode is IElementNode parentElement
&& parentElement.Properties.TryGetValue(XmlName._CreateContent, out var createContent)
&& createContent == node)
return true;
return false;
}
static bool IsStyle(INode node, INode parentNode) => (parentNode as ElementNode)?.XmlType.Name == "Style";
static bool IsVisualStateGroupList(ElementNode node) => node?.XmlType.Name == "VisualStateGroup" && node?.Parent is IListNode;
}
} |