maui-linux/System.Maui.Xaml/ApplyPropertiesVisitor.cs

757 строки
29 KiB
C#

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Reflection;
using System.Xml;
using System.Maui.Internals;
using System.Maui.Xaml.Diagnostics;
using System.Maui.Xaml.Internals;
using static System.String;
namespace System.Maui.Xaml
{
class ApplyPropertiesVisitor : IXamlNodeVisitor
{
public static readonly IList<XmlName> Skips = new List<XmlName> {
XmlName.xKey,
XmlName.xTypeArguments,
XmlName.xArguments,
XmlName.xFactoryMethod,
XmlName.xName,
XmlName.xDataType
};
public ApplyPropertiesVisitor(HydrationContext context, bool stopOnResourceDictionary = false)
{
Context = context;
StopOnResourceDictionary = stopOnResourceDictionary;
}
Dictionary<INode, object> Values => Context.Values;
HydrationContext Context { get; }
public TreeVisitingMode VisitingMode => TreeVisitingMode.BottomUp;
public bool StopOnDataTemplate => true;
public bool StopOnResourceDictionary { get; }
public bool VisitNodeOnDataTemplate => true;
public bool SkipChildren(INode node, INode parentNode) => false;
public bool IsResourceDictionary(ElementNode node) => Context.Types.TryGetValue(node, out var type) && typeof(ResourceDictionary).IsAssignableFrom(type);
public void Visit(ValueNode node, INode parentNode)
{
var parentElement = parentNode as IElementNode;
var value = Values [node];
if (!Values.TryGetValue(parentNode, out var source) && Context.ExceptionHandler != null)
return;
XmlName propertyName;
if (TryGetPropertyName(node, parentNode, out propertyName)) {
if (TrySetRuntimeName(propertyName, source, value, node))
return;
if (Skips.Contains(propertyName))
return;
if (parentElement.SkipProperties.Contains(propertyName))
return;
if (propertyName.Equals(XamlParser.McUri, "Ignorable"))
return;
SetPropertyValue(source, propertyName, value, Context.RootElement, node, Context, node);
} else if (IsCollectionItem(node, parentNode) && parentNode is IElementNode) {
// Collection element, implicit content, or implicit collection element.
var contentProperty = GetContentPropertyName(Context.Types[parentElement].GetTypeInfo());
if (contentProperty != null) {
var name = new XmlName(((ElementNode)parentNode).NamespaceURI, contentProperty);
if (Skips.Contains(name))
return;
if (parentElement.SkipProperties.Contains(propertyName))
return;
SetPropertyValue(source, name, value, Context.RootElement, node, Context, node);
}
}
}
public void Visit(MarkupNode node, INode parentNode)
{
}
public void Visit(ElementNode node, INode parentNode)
{
XmlName propertyName;
if (TryGetPropertyName(node, parentNode, out propertyName) && propertyName == XmlName._CreateContent) {
var s0 = Values[parentNode];
if (s0 is ElementTemplate) {
SetTemplate(s0 as ElementTemplate, node);
return;
}
}
var parentElement = parentNode as IElementNode;
propertyName = XmlName.Empty;
//Simplify ListNodes with single elements
var pList = parentNode as ListNode;
if (pList != null && pList.CollectionItems.Count == 1) {
propertyName = pList.XmlName;
parentNode = parentNode.Parent;
parentElement = parentNode as IElementNode;
}
if (!Values.TryGetValue(node, out var value) && Context.ExceptionHandler != null)
return;
if (propertyName != XmlName.Empty || TryGetPropertyName(node, parentNode, out propertyName)) {
if (Skips.Contains(propertyName))
return;
if (parentElement.SkipProperties.Contains(propertyName))
return;
if (!Values.TryGetValue(parentNode, out var source) && Context.ExceptionHandler != null)
return;
ProvideValue(ref value, node, source, propertyName);
SetPropertyValue(source, propertyName, value, Context.RootElement, node, Context, node);
}
else if (IsCollectionItem(node, parentNode) && parentNode is IElementNode) {
if (!Values.TryGetValue(parentNode, out var source) && Context.ExceptionHandler != null)
return;
ProvideValue(ref value, node, source, XmlName.Empty);
string contentProperty;
Exception xpe = null;
var xKey = node.Properties.ContainsKey(XmlName.xKey) ? ((ValueNode)node.Properties[XmlName.xKey]).Value as string : null;
//ResourceDictionary
if (xpe == null && TryAddToResourceDictionary(source as ResourceDictionary, value, xKey, node, out xpe))
return;
// Collection element, implicit content, or implicit collection element.
if (xpe == null && typeof(IEnumerable).IsAssignableFrom(Context.Types[parentElement]) && Context.Types[parentElement].GetRuntimeMethods().Any(mi => mi.Name == "Add" && mi.GetParameters().Length == 1)) {
var addMethod =
Context.Types[parentElement].GetRuntimeMethods().First(mi => mi.Name == "Add" && mi.GetParameters().Length == 1);
addMethod.Invoke(source, new[] { value });
return;
}
if (xpe == null && (contentProperty = GetContentPropertyName(Context.Types[parentElement].GetTypeInfo())) != null) {
var name = new XmlName(node.NamespaceURI, contentProperty);
if (Skips.Contains(name))
return;
if (parentElement.SkipProperties.Contains(propertyName))
return;
SetPropertyValue(source, name, value, Context.RootElement, node, Context, node);
return;
}
xpe = xpe ?? new XamlParseException($"Can not set the content of {((IElementNode)parentNode).XmlType.Name} as it doesn't have a ContentPropertyAttribute", node);
if (Context.ExceptionHandler != null)
Context.ExceptionHandler(xpe);
else
throw xpe;
}
else if (IsCollectionItem(node, parentNode) && parentNode is ListNode) {
if (!Values.TryGetValue(parentNode.Parent, out var source) && Context.ExceptionHandler != null)
return;
ProvideValue(ref value, node, source, XmlName.Empty);
var parentList = (ListNode)parentNode;
if (Skips.Contains(parentList.XmlName))
return;
Exception xpe = null;
var xKey = node.Properties.ContainsKey(XmlName.xKey) ? ((ValueNode)node.Properties[XmlName.xKey]).Value as string : null;
var collection = GetPropertyValue(source, parentList.XmlName, Context, parentList, out _, out _) as IEnumerable;
if (collection == null)
xpe = new XamlParseException($"Property {parentList.XmlName.LocalName} is null or is not IEnumerable", node);
if (xpe == null && TryAddToResourceDictionary(collection as ResourceDictionary, value, xKey, node, out xpe))
return;
MethodInfo addMethod;
if (xpe == null && (addMethod = collection.GetType().GetRuntimeMethods().First(mi => mi.Name == "Add" && mi.GetParameters().Length == 1)) != null) {
addMethod.Invoke(collection, new[] { value });
return;
}
xpe = xpe ?? new XamlParseException($"Value of {parentList.XmlName.LocalName} does not have a Add() method", node);
if (Context.ExceptionHandler != null)
Context.ExceptionHandler(xpe);
else
throw xpe;
}
}
public void Visit(RootNode node, INode parentNode)
{
}
public void Visit(ListNode node, INode parentNode)
{
}
public static bool TryGetPropertyName(INode node, INode parentNode, out XmlName name)
{
name = default(XmlName);
var parentElement = parentNode as IElementNode;
if (parentElement == null)
return false;
foreach (var kvp in parentElement.Properties) {
if (kvp.Value != node)
continue;
name = kvp.Key;
return true;
}
return false;
}
internal static bool IsCollectionItem(INode node, INode parentNode)
{
var parentList = parentNode as IListNode;
if (parentList == null)
return false;
return parentList.CollectionItems.Contains(node);
}
internal static string GetContentPropertyName(TypeInfo typeInfo)
{
while (typeInfo != null) {
var propName = GetContentPropertyName(typeInfo.CustomAttributes);
if (propName != null)
return propName;
typeInfo = typeInfo?.BaseType?.GetTypeInfo();
}
return null;
}
void ProvideValue(ref object value, ElementNode node, object source, XmlName propertyName)
{
var markupExtension = value as IMarkupExtension;
var valueProvider = value as IValueProvider;
if (markupExtension == null && valueProvider == null)
return;
XamlServiceProvider serviceProvider = null;
if (value.GetType().GetTypeInfo().GetCustomAttribute<AcceptEmptyServiceProviderAttribute>() == null)
serviceProvider = new XamlServiceProvider(node, Context);
if (serviceProvider != null && propertyName != XmlName.Empty)
((XamlValueTargetProvider)serviceProvider.IProvideValueTarget).TargetProperty = GetTargetProperty(source, propertyName, Context, node);
try {
if (markupExtension != null)
value = markupExtension.ProvideValue(serviceProvider);
else if (valueProvider != null)
value = valueProvider.ProvideValue(serviceProvider);
} catch (Exception e) {
if (Context.ExceptionHandler != null)
Context.ExceptionHandler(e);
else
throw e;
}
}
static string GetContentPropertyName(IEnumerable<CustomAttributeData> attributes)
{
var contentAttribute =
attributes.FirstOrDefault(cad => ContentPropertyAttribute.ContentPropertyTypes.Contains(cad.AttributeType.FullName));
if (contentAttribute == null || contentAttribute.ConstructorArguments.Count != 1)
return null;
if (contentAttribute.ConstructorArguments [0].ArgumentType == typeof(string))
return (string)contentAttribute.ConstructorArguments [0].Value;
return null;
}
static bool GetRealNameAndType(ref Type elementType, string namespaceURI, ref string localname,
HydrationContext context, IXmlLineInfo lineInfo)
{
var dotIdx = localname.IndexOf('.');
if (dotIdx > 0) {
var typename = localname.Substring(0, dotIdx);
localname = localname.Substring(dotIdx + 1);
XamlParseException xpe;
elementType = XamlParser.GetElementType(new XmlType(namespaceURI, typename, null), lineInfo,
context.RootElement.GetType().GetTypeInfo().Assembly, out xpe);
if (xpe != null)
throw xpe;
return true;
}
return false;
}
static BindableProperty GetBindableProperty(Type elementType, string localName, IXmlLineInfo lineInfo,
bool throwOnError = false)
{
#if NETSTANDARD1_0
var bindableFieldInfo = elementType.GetFields().FirstOrDefault(fi => fi.Name == localName + "Property");
#else
// F# does not support public fields, so allow internal (Assembly) as well as public
const BindingFlags supportedFlags = BindingFlags.Static | BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.FlattenHierarchy;
var bindableFieldInfo = elementType.GetFields(supportedFlags)
.FirstOrDefault(fi => (fi.IsAssembly || fi.IsPublic) && fi.Name == localName + "Property");
#endif
Exception exception = null;
if (exception == null && bindableFieldInfo == null) {
exception =
new XamlParseException(
Format("BindableProperty {0} not found on {1}", localName + "Property", elementType.Name), lineInfo);
}
if (exception == null)
return bindableFieldInfo.GetValue(null) as BindableProperty;
if (throwOnError)
throw exception;
return null;
}
static object GetTargetProperty(object xamlelement, XmlName propertyName, HydrationContext context, IXmlLineInfo lineInfo)
{
var localName = propertyName.LocalName;
//If it's an attached BP, update elementType and propertyName
var bpOwnerType = xamlelement.GetType();
GetRealNameAndType(ref bpOwnerType, propertyName.NamespaceURI, ref localName, context, lineInfo);
var property = GetBindableProperty(bpOwnerType, localName, lineInfo, false);
if (property != null)
return property;
var elementType = xamlelement.GetType();
var propertyInfo = elementType.GetRuntimeProperties().FirstOrDefault(p => p.Name == localName);
return propertyInfo;
}
public static void SetPropertyValue(object xamlelement, XmlName propertyName, object value, object rootElement, INode node, HydrationContext context, IXmlLineInfo lineInfo)
{
var localName = propertyName.LocalName;
var serviceProvider = new XamlServiceProvider(node, context);
Exception xpe = null;
var xKey = node is IElementNode && ((IElementNode)node).Properties.ContainsKey(XmlName.xKey) ? ((ValueNode)((IElementNode)node).Properties[XmlName.xKey]).Value as string : null;
//If it's an attached BP, update elementType and propertyName
var bpOwnerType = xamlelement.GetType();
var attached = GetRealNameAndType(ref bpOwnerType, propertyName.NamespaceURI, ref localName, context, lineInfo);
var property = GetBindableProperty(bpOwnerType, localName, lineInfo, false);
//If the target is an event, connect
if (xpe == null && TryConnectEvent(xamlelement, localName, attached, value, rootElement, lineInfo, out xpe))
return;
//If Value is DynamicResource and it's a BP, SetDynamicResource
if (xpe == null && TrySetDynamicResource(xamlelement, property, value, lineInfo, out xpe))
return;
//If value is BindingBase, SetBinding
if (xpe == null && TrySetBinding(xamlelement, property, localName, value, lineInfo, out xpe))
return;
var assemblyName = (context.RootAssembly ?? rootElement.GetType().GetTypeInfo().Assembly)?.GetName().Name;
//If it's a BindableProberty, SetValue
if (xpe == null && TrySetValue(xamlelement, property, attached, value, lineInfo, serviceProvider, out xpe)) {
if (!(node is ValueNode) && value != null && !value.GetType().GetTypeInfo().IsValueType && XamlFilePathAttribute.GetFilePathForObject(context.RootElement) is string path)
VisualDiagnostics.RegisterSourceInfo(value, new Uri($"{path};assembly={assemblyName}", UriKind.Relative), ((IXmlLineInfo)node).LineNumber, ((IXmlLineInfo)node).LinePosition);
return;
}
//If we can assign that value to a normal property, let's do it
if (xpe == null && TrySetProperty(xamlelement, localName, value, lineInfo, serviceProvider, context, out xpe)) {
if (!(node is ValueNode) && value != null && !value.GetType().GetTypeInfo().IsValueType && XamlFilePathAttribute.GetFilePathForObject(context.RootElement) is string path)
VisualDiagnostics.RegisterSourceInfo(value, new Uri($"{path};assembly={assemblyName}", UriKind.Relative), ((IXmlLineInfo)node).LineNumber, ((IXmlLineInfo)node).LinePosition);
return;
}
//If it's an already initialized property, add to it
if (xpe == null && TryAddToProperty(xamlelement, propertyName, value, xKey, lineInfo, serviceProvider, context, out xpe)) {
if (!(node is ValueNode) && value != null && !value.GetType().GetTypeInfo().IsValueType && XamlFilePathAttribute.GetFilePathForObject(context.RootElement) is string path)
VisualDiagnostics.RegisterSourceInfo(value, new Uri($"{path};assembly={assemblyName}", UriKind.Relative), ((IXmlLineInfo)node).LineNumber, ((IXmlLineInfo)node).LinePosition);
return;
}
xpe = xpe ?? new XamlParseException($"Cannot assign property \"{localName}\": Property does not exist, or is not assignable, or mismatching type between value and property", lineInfo);
if (context.ExceptionHandler != null)
context.ExceptionHandler(xpe);
else
throw xpe;
}
public static object GetPropertyValue(object xamlElement, XmlName propertyName, HydrationContext context, IXmlLineInfo lineInfo, out Exception xpe, out object targetProperty)
{
var localName = propertyName.LocalName;
xpe = null;
targetProperty = null;
//If it's an attached BP, update elementType and propertyName
var bpOwnerType = xamlElement.GetType();
var attached = GetRealNameAndType(ref bpOwnerType, propertyName.NamespaceURI, ref localName, context, lineInfo);
var property = GetBindableProperty(bpOwnerType, localName, lineInfo, false);
//If it's a BindableProberty, GetValue
if (xpe == null && TryGetValue(xamlElement, property, attached, out var value, lineInfo, out xpe, out targetProperty))
return value;
//If it's a normal property, get it
if (xpe == null && TryGetProperty(xamlElement, localName, out value, lineInfo, context, out xpe, out targetProperty))
return value;
xpe = xpe ?? new XamlParseException($"Property {localName} is not found or does not have an accessible getter", lineInfo);
return null;
}
static bool TryConnectEvent(object element, string localName, bool attached, object value, object rootElement, IXmlLineInfo lineInfo, out Exception exception)
{
exception = null;
if (attached)
return false;
var elementType = element.GetType();
var eventInfo = elementType.GetRuntimeEvent(localName);
var stringValue = value as string;
if (eventInfo == null || IsNullOrEmpty(stringValue))
return false;
foreach (var mi in rootElement.GetType().GetRuntimeMethods()) {
if (mi.Name == (string)value) {
try {
eventInfo.AddEventHandler(element, mi.CreateDelegate(eventInfo.EventHandlerType, mi.IsStatic ? null : rootElement));
return true;
} catch (ArgumentException) {
// incorrect method signature
}
}
}
exception = new XamlParseException($"No method {value} with correct signature found on type {rootElement.GetType()}", lineInfo);
return false;
}
static bool TrySetDynamicResource(object element, BindableProperty property, object value, IXmlLineInfo lineInfo, out Exception exception)
{
exception = null;
var elementType = element.GetType();
var dynamicResource = value as DynamicResource;
var bindable = element as BindableObject;
if (dynamicResource == null || property == null)
return false;
if (bindable == null) {
exception = new XamlParseException($"{elementType.Name} is not a BindableObject", lineInfo);
return false;
}
bindable.SetDynamicResource(property, dynamicResource.Key);
return true;
}
static bool TrySetBinding(object element, BindableProperty property, string localName, object value, IXmlLineInfo lineInfo, out Exception exception)
{
exception = null;
var elementType = element.GetType();
var binding = value.ConvertTo(typeof(BindingBase),pinfoRetriever:null,serviceProvider:null, exception:out exception) as BindingBase;
if (exception != null)
return false;
var bindable = element as BindableObject;
var nativeBindingService = DependencyService.Get<INativeBindingService>();
if (binding == null)
return false;
if (bindable != null && property != null) {
bindable.SetBinding(property, binding);
return true;
}
if (nativeBindingService != null && property != null && nativeBindingService.TrySetBinding(element, property, binding))
return true;
if (nativeBindingService != null && nativeBindingService.TrySetBinding(element, localName, binding))
return true;
if (property != null)
exception = new XamlParseException($"{elementType.Name} is not a BindableObject or does not support native bindings", lineInfo);
return false;
}
static bool TrySetValue(object element, BindableProperty property, bool attached, object value, IXmlLineInfo lineInfo, XamlServiceProvider serviceProvider, out Exception exception)
{
exception = null;
var elementType = element.GetType();
var bindable = element as BindableObject;
var nativeBindingService = DependencyService.Get<INativeBindingService>();
if (property == null)
return false;
if (serviceProvider != null && serviceProvider.IProvideValueTarget != null)
((XamlValueTargetProvider)serviceProvider.IProvideValueTarget).TargetProperty = property;
Func<MemberInfo> minforetriever;
if (attached)
minforetriever = () =>
{
try {
return property.DeclaringType.GetRuntimeMethod("Get" + property.PropertyName, new[] { typeof(BindableObject) });
} catch (AmbiguousMatchException e) {
throw new XamlParseException($"Multiple methods with name '{property.DeclaringType}.Get{property.PropertyName}' found.", lineInfo, innerException: e);
}
};
else
minforetriever = () =>
{
try {
return property.DeclaringType.GetRuntimeProperty(property.PropertyName);
} catch (AmbiguousMatchException e) {
throw new XamlParseException($"Multiple properties with name '{property.DeclaringType}.{property.PropertyName}' found.", lineInfo, innerException: e);
}
};
var convertedValue = value.ConvertTo(property.ReturnType, minforetriever, serviceProvider, out exception);
if (exception != null)
return false;
if (bindable != null) {
//SetValue doesn't throw on mismatching type, so check before to get a chance to try the property setting or the collection adding
var nullable = property.ReturnTypeInfo.IsGenericType &&
property.ReturnTypeInfo.GetGenericTypeDefinition() == typeof(Nullable<>);
if ((convertedValue == null && (!property.ReturnTypeInfo.IsValueType || nullable)) ||
(property.ReturnType.IsInstanceOfType(convertedValue))) {
try {
bindable.SetValue(property, convertedValue);
return true;
}
catch (Exception e) {
exception = e;
return false;
}
}
// This might be a collection; see if we can add to it
return TryAddValue(bindable, property, value, serviceProvider, out exception);
}
if (nativeBindingService != null && nativeBindingService.TrySetValue(element, property, convertedValue))
return true;
exception = new XamlParseException($"{elementType.Name} is not a BindableObject or does not support setting native BindableProperties", lineInfo);
return false;
}
static bool TryGetValue(object element, BindableProperty property, bool attached, out object value, IXmlLineInfo lineInfo, out Exception exception, out object targetProperty)
{
exception = null;
value = null;
targetProperty = property;
var elementType = element.GetType();
var bindable = element as BindableObject;
if (property == null)
return false;
if (bindable == null)
return false;
value = bindable.GetValue(property);
return true;
}
static bool TrySetProperty(object element, string localName, object value, IXmlLineInfo lineInfo, XamlServiceProvider serviceProvider, HydrationContext context, out Exception exception)
{
exception = null;
var elementType = element.GetType();
var propertyInfo = elementType.GetRuntimeProperties().FirstOrDefault(p => p.Name == localName);
MethodInfo setter;
if (propertyInfo == null || !propertyInfo.CanWrite || (setter = propertyInfo.SetMethod) == null)
return false;
if (!IsVisibleFrom(setter, context.RootElement))
return false;
if (serviceProvider != null && serviceProvider.IProvideValueTarget != null)
((XamlValueTargetProvider)serviceProvider.IProvideValueTarget).TargetProperty = propertyInfo;
object convertedValue = value.ConvertTo(propertyInfo.PropertyType, () => propertyInfo, serviceProvider, out exception);
if (exception != null || (convertedValue != null && !propertyInfo.PropertyType.IsInstanceOfType(convertedValue)))
return false;
try {
setter.Invoke(element, new object[] { convertedValue });
return true;
}
catch (Exception e) {
exception = e;
return false;
}
}
static bool TryGetProperty(object element, string localName, out object value, IXmlLineInfo lineInfo, HydrationContext context, out Exception exception, out object targetProperty)
{
exception = null;
value = null;
var elementType = element.GetType();
PropertyInfo propertyInfo = null;
#if NETSTANDARD1_0
try {
propertyInfo = elementType.GetRuntimeProperty(localName);
} catch (AmbiguousMatchException) {
// Get most derived instance of property
foreach (var property in elementType.GetRuntimeProperties().Where(prop => prop.Name == localName)) {
if (propertyInfo == null || propertyInfo.DeclaringType.IsAssignableFrom(property.DeclaringType))
propertyInfo = property;
}
}
#else
while (elementType != null && propertyInfo == null) {
try {
propertyInfo = elementType.GetProperty(localName, BindingFlags.Instance | BindingFlags.Static | BindingFlags.Public | BindingFlags.DeclaredOnly);
} catch (AmbiguousMatchException e) {
throw new XamlParseException($"Multiple properties with name '{elementType}.{localName}' found.", lineInfo, innerException: e);
}
elementType = elementType.BaseType;
}
#endif
MethodInfo getter;
targetProperty = propertyInfo;
if (propertyInfo == null || !propertyInfo.CanRead || (getter = propertyInfo.GetMethod) == null)
return false;
if (!IsVisibleFrom(getter, context.RootElement))
return false;
value = getter.Invoke(element, new object[] { });
return true;
}
static bool IsVisibleFrom(MethodInfo method, object rootElement)
{
if (method.IsPublic)
return true;
if (method.IsPrivate && method.DeclaringType == rootElement.GetType())
return true;
if ((method.IsAssembly || method.IsFamilyOrAssembly) && method.DeclaringType.AssemblyQualifiedName == rootElement.GetType().AssemblyQualifiedName)
return true;
if (method.IsFamily && method.DeclaringType.IsAssignableFrom(rootElement.GetType()))
return true;
return false;
}
static bool TryAddToProperty(object element, XmlName propertyName, object value, string xKey, IXmlLineInfo lineInfo, XamlServiceProvider serviceProvider, HydrationContext context, out Exception exception)
{
exception = null;
if (!(GetPropertyValue(element, propertyName, context, lineInfo, out _, out var targetProperty) is IEnumerable collection))
return false;
if (exception == null && TryAddToResourceDictionary(collection as ResourceDictionary, value, xKey, lineInfo, out exception))
return true;
if (exception != null)
return false;
var addMethod = collection.GetType().GetRuntimeMethods().First(mi => mi.Name == "Add" && mi.GetParameters().Length == 1);
if (addMethod == null)
return false;
if (serviceProvider != null)
((XamlValueTargetProvider)serviceProvider.IProvideValueTarget).TargetProperty = targetProperty;
try {
addMethod.Invoke(collection, new[] { value.ConvertTo(addMethod.GetParameters()[0].ParameterType, (Func<TypeConverter>)null, serviceProvider, out exception) });
}
catch (Exception e) {
exception = e;
}
return exception == null;
}
static bool TryAddToResourceDictionary(ResourceDictionary resourceDictionary, object value, string xKey, IXmlLineInfo lineInfo, out Exception exception)
{
exception = null;
if (resourceDictionary == null)
return false;
if (xKey != null)
resourceDictionary.Add(xKey, value);
else if (value is Style)
resourceDictionary.Add((Style)value);
else if (value is ResourceDictionary)
resourceDictionary.Add((ResourceDictionary)value);
else if (value is StyleSheets.StyleSheet)
resourceDictionary.Add((StyleSheets.StyleSheet)value);
else {
exception = new XamlParseException("resources in ResourceDictionary require a x:Key attribute", lineInfo);
return false;
}
return true;
}
void SetTemplate(ElementTemplate dt, INode node)
{
#pragma warning disable 0612
((IDataTemplate)dt).LoadTemplate = () => {
#pragma warning restore 0612
var cnode = node.Clone();
var context = new HydrationContext { ParentContext = Context, RootAssembly = Context.RootAssembly, RootElement = Context.RootElement, ExceptionHandler = Context.ExceptionHandler };
cnode.Accept(new XamlNodeVisitor((n, parent) => n.Parent = parent), node.Parent); //set parents for {StaticResource}
cnode.Accept(new ExpandMarkupsVisitor(context), null);
cnode.Accept(new NamescopingVisitor(context), null);
cnode.Accept(new CreateValuesVisitor(context), null);
cnode.Accept(new RegisterXNamesVisitor(context), null);
cnode.Accept(new FillResourceDictionariesVisitor(context), null);
cnode.Accept(new ApplyPropertiesVisitor(context, true), null);
return context.Values [cnode];
};
}
static bool TryAddValue(BindableObject bindable, BindableProperty property, object value, XamlServiceProvider serviceProvider, out Exception exception)
{
exception = null;
if (property?.ReturnTypeInfo?.GenericTypeArguments == null)
return false;
if (property.ReturnType == null)
return false;
if (property.ReturnTypeInfo.GenericTypeArguments.Length != 1 || !property.ReturnTypeInfo.GenericTypeArguments[0].IsInstanceOfType(value))
return false;
// This might be a collection we can add to; see if we can find an Add method
var addMethod = GetAllRuntimeMethods(property.ReturnType).FirstOrDefault(mi => mi.Name == "Add" && mi.GetParameters().Length == 1);
if (addMethod == null)
return false;
// If there's an add method, get the collection
var collection = bindable.GetValue(property);
// And add the new value to it
addMethod.Invoke(collection, new[] { value.ConvertTo(addMethod.GetParameters()[0].ParameterType, (Func<TypeConverter>)null, serviceProvider, out exception) });
return exception == null;
}
static IEnumerable<MethodInfo> GetAllRuntimeMethods(Type type)
{
return type.GetRuntimeMethods()
.Concat(type.GetTypeInfo().ImplementedInterfaces.SelectMany(t => t.GetRuntimeMethods()));
}
bool TrySetRuntimeName(XmlName propertyName, object source, object value, ValueNode node)
{
if (propertyName != XmlName.xName)
return false;
var runTimeName = source.GetType().GetTypeInfo().GetCustomAttribute<RuntimeNamePropertyAttribute>();
if (runTimeName == null)
return false;
SetPropertyValue(source, new XmlName("", runTimeName.Name), value, Context.RootElement, node, Context, node);
return true;
}
}
}