/
ResourceDictionary.cs
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/
ResourceDictionary.cs
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using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Collections.Specialized;
using System.ComponentModel;
using System.Globalization;
using System.Linq;
using System.Reflection;
using System.Runtime.CompilerServices;
using Xamarin.Forms.Internals;
using Xamarin.Forms.Xaml;
namespace Xamarin.Forms
{
public class ResourceDictionary : IResourceDictionary, IDictionary<string, object>
{
static ConditionalWeakTable<Type, ResourceDictionary> s_instances = new ConditionalWeakTable<Type, ResourceDictionary>();
readonly Dictionary<string, object> _innerDictionary = new Dictionary<string, object>();
ResourceDictionary _mergedInstance;
Type _mergedWith;
Uri _source;
[TypeConverter(typeof(TypeTypeConverter))]
[Obsolete("Use Source")]
[EditorBrowsable(EditorBrowsableState.Never)]
public Type MergedWith {
get { return _mergedWith; }
set {
if (_mergedWith == value)
return;
if (_source != null)
throw new ArgumentException("MergedWith can not be used with Source");
if (!typeof(ResourceDictionary).GetTypeInfo().IsAssignableFrom(value.GetTypeInfo()))
throw new ArgumentException("MergedWith should inherit from ResourceDictionary");
_mergedWith = value;
if (_mergedWith == null)
return;
_mergedInstance = s_instances.GetValue(_mergedWith, (key) => (ResourceDictionary)Activator.CreateInstance(key));
OnValuesChanged(_mergedInstance.ToArray());
}
}
[TypeConverter(typeof(RDSourceTypeConverter))]
public Uri Source {
get { return _source; }
set {
if (_source == value)
return;
throw new InvalidOperationException("Source can only be set from XAML."); //through the RDSourceTypeConverter
}
}
//Used by the XamlC compiled converter
[EditorBrowsable(EditorBrowsableState.Never)]
public void SetAndLoadSource(Uri value, string resourcePath, Assembly assembly, System.Xml.IXmlLineInfo lineInfo)
{
_source = value;
if (_mergedWith != null)
throw new ArgumentException("Source can not be used with MergedWith");
//this will return a type if the RD as an x:Class element, and codebehind
var type = XamlResourceIdAttribute.GetTypeForPath(assembly, resourcePath);
if (type != null)
_mergedInstance = s_instances.GetValue(type, (key) => (ResourceDictionary)Activator.CreateInstance(key));
else
_mergedInstance = DependencyService.Get<IResourcesLoader>().CreateFromResource<ResourceDictionary>(resourcePath, assembly, lineInfo);
OnValuesChanged(_mergedInstance.ToArray());
}
ObservableCollection<ResourceDictionary> _mergedDictionaries;
public ICollection<ResourceDictionary> MergedDictionaries {
get {
if (_mergedDictionaries == null) {
var col = new ObservableCollection<ResourceDictionary>();
col.CollectionChanged += MergedDictionaries_CollectionChanged;
_mergedDictionaries = col;
}
return _mergedDictionaries;
}
}
internal IList<StyleSheets.StyleSheet> StyleSheets { get; set; }
void StyleSheetsCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
switch (e.Action) {
case NotifyCollectionChangedAction.Add:
ValuesChanged?.Invoke(this, ResourcesChangedEventArgs.StyleSheets);
break;
}
}
IList<ResourceDictionary> _collectionTrack;
void MergedDictionaries_CollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
{
// Move() isn't exposed by ICollection
if (e.Action == NotifyCollectionChangedAction.Move)
return;
_collectionTrack = _collectionTrack ?? new List<ResourceDictionary>();
// Collection has been cleared
if (e.Action == NotifyCollectionChangedAction.Reset) {
foreach (var dictionary in _collectionTrack)
dictionary.ValuesChanged -= Item_ValuesChanged;
_collectionTrack.Clear();
return;
}
// New Items
if (e.NewItems != null)
{
foreach (var item in e.NewItems)
{
var rd = (ResourceDictionary)item;
_collectionTrack.Add(rd);
rd.ValuesChanged += Item_ValuesChanged;
OnValuesChanged(rd.ToArray());
}
}
// Old Items
if (e.OldItems != null)
{
foreach (var item in e.OldItems)
{
var rd = (ResourceDictionary)item;
rd.ValuesChanged -= Item_ValuesChanged;
_collectionTrack.Remove(rd);
}
}
}
void Item_ValuesChanged(object sender, ResourcesChangedEventArgs e)
{
OnValuesChanged(e.Values.ToArray());
}
void ICollection<KeyValuePair<string, object>>.Add(KeyValuePair<string, object> item)
{
((ICollection<KeyValuePair<string, object>>)_innerDictionary).Add(item);
OnValuesChanged(item);
}
public void Clear()
{
_innerDictionary.Clear();
}
bool ICollection<KeyValuePair<string, object>>.Contains(KeyValuePair<string, object> item)
{
return ((ICollection<KeyValuePair<string, object>>)_innerDictionary).Contains(item)
|| (_mergedInstance != null && _mergedInstance.Contains(item));
}
void ICollection<KeyValuePair<string, object>>.CopyTo(KeyValuePair<string, object>[] array, int arrayIndex)
{
((ICollection<KeyValuePair<string, object>>)_innerDictionary).CopyTo(array, arrayIndex);
}
public int Count
{
get { return _innerDictionary.Count; }
}
bool ICollection<KeyValuePair<string, object>>.IsReadOnly
{
get { return ((ICollection<KeyValuePair<string, object>>)_innerDictionary).IsReadOnly; }
}
bool ICollection<KeyValuePair<string, object>>.Remove(KeyValuePair<string, object> item)
{
return ((ICollection<KeyValuePair<string, object>>)_innerDictionary).Remove(item);
}
public void Add(string key, object value)
{
if (ContainsKey(key))
throw new ArgumentException($"A resource with the key '{key}' is already present in the ResourceDictionary.");
_innerDictionary.Add(key, value);
OnValueChanged(key, value);
}
public bool ContainsKey(string key)
{
return _innerDictionary.ContainsKey(key);
}
[IndexerName("Item")]
public object this[string index]
{
get
{
if (_innerDictionary.ContainsKey(index))
return _innerDictionary[index];
if (_mergedInstance != null && _mergedInstance.ContainsKey(index))
return _mergedInstance[index];
if (_mergedDictionaries != null)
foreach (var dict in MergedDictionaries.Reverse())
if (dict.ContainsKey(index))
return dict[index];
throw new KeyNotFoundException($"The resource '{index}' is not present in the dictionary.");
}
set
{
_innerDictionary[index] = value;
OnValueChanged(index, value);
}
}
public ICollection<string> Keys
{
get { return _innerDictionary.Keys; }
}
public bool Remove(string key)
{
return _innerDictionary.Remove(key);
}
public ICollection<object> Values
{
get { return _innerDictionary.Values; }
}
IEnumerator IEnumerable.GetEnumerator()
{
return GetEnumerator();
}
public IEnumerator<KeyValuePair<string, object>> GetEnumerator()
{
return _innerDictionary.GetEnumerator();
}
internal IEnumerable<KeyValuePair<string, object>> MergedResources {
get {
if (_mergedDictionaries != null)
{
for (int i = _mergedDictionaries.Count - 1; i >= 0; i--)
{
ResourceDictionary r = _mergedDictionaries[i];
foreach (var x in r.MergedResources)
yield return x;
}
}
if (_mergedInstance != null)
foreach (var r in _mergedInstance.MergedResources)
yield return r;
foreach (var r in _innerDictionary)
yield return r;
}
}
public bool TryGetValue(string key, out object value)
=> TryGetValueAndSource(key, out value, out _);
internal bool TryGetValueAndSource(string key, out object value, out ResourceDictionary source)
{
source = this;
return _innerDictionary.TryGetValue(key, out value)
|| (_mergedInstance != null && _mergedInstance.TryGetValueAndSource(key, out value, out source))
|| (_mergedDictionaries != null && TryGetMergedDictionaryValue(key, out value, out source));
}
bool TryGetMergedDictionaryValue(string key, out object value, out ResourceDictionary source)
{
foreach (var dictionary in MergedDictionaries.Reverse())
if (dictionary.TryGetValue(key, out value)) {
source = dictionary;
return true;
}
value = null; source = null;
return false;
}
event EventHandler<ResourcesChangedEventArgs> IResourceDictionary.ValuesChanged
{
add { ValuesChanged += value; }
remove { ValuesChanged -= value; }
}
public void Add(Style style)
{
if (string.IsNullOrEmpty(style.Class))
Add(style.TargetType.FullName, style);
else
{
IList<Style> classes;
object outclasses;
if (!TryGetValue(Style.StyleClassPrefix + style.Class, out outclasses) || (classes = outclasses as IList<Style>) == null)
classes = new List<Style>();
classes.Add(style);
this[Style.StyleClassPrefix + style.Class] = classes;
}
}
public void Add(ResourceDictionary mergedResourceDictionary)
{
MergedDictionaries.Add(mergedResourceDictionary);
}
public void Add(StyleSheets.StyleSheet styleSheet)
{
StyleSheets = StyleSheets ?? new List<StyleSheets.StyleSheet>(2);
StyleSheets.Add(styleSheet);
ValuesChanged?.Invoke(this, ResourcesChangedEventArgs.StyleSheets);
}
void OnValueChanged(string key, object value)
{
OnValuesChanged(new KeyValuePair<string, object>(key, value));
}
void OnValuesChanged(params KeyValuePair<string, object>[] values)
{
if (values == null || values.Length == 0)
return;
ValuesChanged?.Invoke(this, new ResourcesChangedEventArgs(values));
}
internal void Reload()
{
foreach (var mr in MergedResources)
OnValuesChanged(mr);
}
event EventHandler<ResourcesChangedEventArgs> ValuesChanged;
//only used for unit testing
internal static void ClearCache() => s_instances = new ConditionalWeakTable<Type, ResourceDictionary>();
[Xaml.ProvideCompiled("Xamarin.Forms.Core.XamlC.RDSourceTypeConverter")]
public class RDSourceTypeConverter : TypeConverter, IExtendedTypeConverter
{
object IExtendedTypeConverter.ConvertFromInvariantString(string value, IServiceProvider serviceProvider)
{
if (serviceProvider == null)
throw new ArgumentNullException(nameof(serviceProvider));
var targetRD = (serviceProvider.GetService(typeof(Xaml.IProvideValueTarget)) as Xaml.IProvideValueTarget)?.TargetObject as ResourceDictionary;
if (targetRD == null)
return null;
var rootObjectType = (serviceProvider.GetService(typeof(Xaml.IRootObjectProvider)) as Xaml.IRootObjectProvider)?.RootObject.GetType();
if (rootObjectType == null)
return null;
var lineInfo = (serviceProvider.GetService(typeof(Xaml.IXmlLineInfoProvider)) as Xaml.IXmlLineInfoProvider)?.XmlLineInfo;
var rootTargetPath = XamlResourceIdAttribute.GetPathForType(rootObjectType);
var uri = new Uri(value, UriKind.Relative); //we don't want file:// uris, even if they start with '/'
var resourcePath = GetResourcePath(uri, rootTargetPath);
targetRD.SetAndLoadSource(uri, resourcePath, rootObjectType.GetTypeInfo().Assembly, lineInfo);
return uri;
}
internal static string GetResourcePath(Uri uri, string rootTargetPath)
{
//need a fake scheme so it's not seen as file:// uri, and the forward slashes are valid on all plats
var resourceUri = uri.OriginalString.StartsWith("/", StringComparison.Ordinal)
? new Uri($"pack://{uri.OriginalString}", UriKind.Absolute)
: new Uri($"pack:///{rootTargetPath}/../{uri.OriginalString}", UriKind.Absolute);
//drop the leading '/'
return resourceUri.AbsolutePath.Substring(1);
}
object IExtendedTypeConverter.ConvertFrom(CultureInfo culture, object value, IServiceProvider serviceProvider)
{
throw new NotImplementedException();
}
public override object ConvertFromInvariantString(string value)
{
throw new NotImplementedException();
}
}
}
}