using System; namespace Xamarin.Forms.Xaml { interface IXamlNodeVisitor { TreeVisitingMode VisitingMode { get; } bool StopOnDataTemplate { get; } bool VisitNodeOnDataTemplate { get; } bool StopOnResourceDictionary { get; } void Visit(ValueNode node, INode parentNode); void Visit(MarkupNode node, INode parentNode); void Visit(ElementNode node, INode parentNode); void Visit(RootNode node, INode parentNode); void Visit(ListNode node, INode parentNode); } enum TreeVisitingMode { TopDown, BottomUp } class XamlNodeVisitor : IXamlNodeVisitor { readonly Action action; public XamlNodeVisitor(Action action, TreeVisitingMode visitingMode = TreeVisitingMode.TopDown, bool stopOnDataTemplate = false, bool visitNodeOnDataTemplate = true) { this.action = action; VisitingMode = visitingMode; StopOnDataTemplate = stopOnDataTemplate; VisitNodeOnDataTemplate = visitNodeOnDataTemplate; } public TreeVisitingMode VisitingMode { get; } public bool StopOnDataTemplate { get; } public bool StopOnResourceDictionary { get; } public bool VisitNodeOnDataTemplate { get; } public void Visit(ValueNode node, INode parentNode) { action(node, parentNode); } public void Visit(MarkupNode node, INode parentNode) { action(node, parentNode); } public void Visit(ElementNode node, INode parentNode) { action(node, parentNode); } public void Visit(RootNode node, INode parentNode) { action(node, parentNode); } public void Visit(ListNode node, INode parentNode) { action(node, parentNode); } } }