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using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Reflection;
using System.Linq;
using System.Threading.Tasks;
namespace Xamarin.PropertyEditing.Reflection
{
public class ReflectionObjectEditor
: IObjectEditor, INameableObject, IObjectEventEditor
{
public ReflectionObjectEditor (object target)
{
if (target == null)
throw new ArgumentNullException (nameof (target));
this.target = target;
Type targetType = target.GetType ();
this.properties.AddRange (ReflectionEditorProvider.GetPropertiesForType (targetType));
foreach (EventInfo ev in targetType.GetEvents ()) {
this.events.Add (new ReflectionEventInfo (ev));
}
}
public event EventHandler<EditorPropertyChangedEventArgs> PropertyChanged;
public object Target => this.target;
public ITypeInfo TargetType => Target.GetType ().ToTypeInfo ();
public IReadOnlyCollection<IPropertyInfo> Properties => this.properties;
public IReadOnlyDictionary<IPropertyInfo, KnownProperty> KnownProperties => null;
public IReadOnlyCollection<IEventInfo> Events => this.events;
public IObjectEditor Parent => null;
public IReadOnlyList<IObjectEditor> DirectChildren => EmptyDirectChildren;
public string Name
{
get;
private set;
}
public Task SetNameAsync (string name)
{
Name = name;
return Task.FromResult (true);
}
public Task<string> GetNameAsync()
{
return Task.FromResult (Name);
}
public Task AttachHandlerAsync (IEventInfo ev, string handlerName)
{
throw new NotSupportedException ();
}
public Task DetachHandlerAsync (IEventInfo ev, string handlerName)
{
throw new NotSupportedException ();
}
public Task<IReadOnlyList<string>> GetHandlersAsync (IEventInfo ev)
{
if (ev == null)
throw new ArgumentNullException (nameof (ev));
ReflectionEventInfo info = ev as ReflectionEventInfo;
if (info == null)
throw new ArgumentException ();
return Task.FromResult (info.GetHandlers (this.target));
}
public Task<AssignableTypesResult> GetAssignableTypesAsync (IPropertyInfo property, bool childTypes)
{
return GetAssignableTypes (property.RealType, childTypes);
}
public async Task SetValueAsync<T> (IPropertyInfo property, ValueInfo<T> value, PropertyVariation variation = null)
{
if (property == null)
throw new ArgumentNullException (nameof (property));
ReflectionPropertyInfo info = property as ReflectionPropertyInfo;
if (info == null)
throw new ArgumentException();
await info.SetValueAsync (this.target, value.Value);
OnPropertyChanged (info);
}
public Task<ITypeInfo> GetValueTypeAsync (IPropertyInfo property, PropertyVariation variation = null)
{
if (property == null)
throw new ArgumentNullException (nameof (property));
ReflectionPropertyInfo info = property as ReflectionPropertyInfo;
if (info == null)
throw new ArgumentException();
return Task.FromResult (info.GetValueType (Target));
}
public async Task<ValueInfo<T>> GetValueAsync<T> (IPropertyInfo property, PropertyVariation variation = null)
{
if (property == null)
throw new ArgumentNullException (nameof (property));
ReflectionPropertyInfo info = property as ReflectionPropertyInfo;
if (info == null)
throw new ArgumentException();
T value = await info.GetValueAsync<T> (this.target);
return new ValueInfo<T> {
Source = ValueSource.Local,
Value = value
};
}
internal static Task<AssignableTypesResult> GetAssignableTypes (ITypeInfo type, bool childTypes)
{
return Task.Run (() => {
var types = AppDomain.CurrentDomain.GetAssemblies ().SelectMany (a => a.GetTypes ()).AsParallel ()
.Where (t => t.Namespace != null && !t.IsAbstract && !t.IsInterface && t.IsPublic && t.GetConstructor (Type.EmptyTypes) != null);
Type realType = ReflectionEditorProvider.GetRealType (type);
if (childTypes) {
var generic = realType.GetInterface ("ICollection`1");
if (generic != null) {
realType = generic.GetGenericArguments()[0];
} else {
realType = typeof(object);
}
}
types = types.Where (t => realType.IsAssignableFrom (t));
return new AssignableTypesResult (types.Select (t => {
string asmName = t.Assembly.GetName ().Name;
return new TypeInfo (new AssemblyInfo (asmName, isRelevant: asmName.StartsWith ("Xamarin")), t.Namespace, t.Name);
}).ToList ());
});
}
private readonly object target;
private readonly List<ReflectionPropertyInfo> properties = new List<ReflectionPropertyInfo> ();
private readonly List<ReflectionEventInfo> events = new List<ReflectionEventInfo> ();
private static readonly IObjectEditor[] EmptyDirectChildren = new IObjectEditor[0];
protected virtual void OnPropertyChanged (IPropertyInfo property)
{
PropertyChanged?.Invoke (this, new EditorPropertyChangedEventArgs (property));
}
}
}
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