зеркало из https://github.com/DeGsoft/maui-linux.git
343 строки
20 KiB
C#
343 строки
20 KiB
C#
using System;
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using System.Collections.Generic;
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using System.Diagnostics;
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using System.Linq.Expressions;
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using System.Reflection;
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using Xamarin.Forms.Internals;
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namespace Xamarin.Forms
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{
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[DebuggerDisplay("{PropertyName}")]
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[TypeConverter(typeof(BindablePropertyConverter))]
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public sealed class BindableProperty
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{
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public delegate void BindingPropertyChangedDelegate(BindableObject bindable, object oldValue, object newValue);
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public delegate void BindingPropertyChangedDelegate<in TPropertyType>(BindableObject bindable, TPropertyType oldValue, TPropertyType newValue);
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public delegate void BindingPropertyChangingDelegate(BindableObject bindable, object oldValue, object newValue);
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public delegate void BindingPropertyChangingDelegate<in TPropertyType>(BindableObject bindable, TPropertyType oldValue, TPropertyType newValue);
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public delegate object CoerceValueDelegate(BindableObject bindable, object value);
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public delegate TPropertyType CoerceValueDelegate<TPropertyType>(BindableObject bindable, TPropertyType value);
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public delegate object CreateDefaultValueDelegate(BindableObject bindable);
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public delegate TPropertyType CreateDefaultValueDelegate<in TDeclarer, out TPropertyType>(TDeclarer bindable);
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public delegate bool ValidateValueDelegate(BindableObject bindable, object value);
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public delegate bool ValidateValueDelegate<in TPropertyType>(BindableObject bindable, TPropertyType value);
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static readonly Dictionary<Type, TypeConverter> WellKnownConvertTypes = new Dictionary<Type,TypeConverter>
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{
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{ typeof(Uri), new UriTypeConverter() },
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{ typeof(Color), new ColorTypeConverter() },
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};
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// more or less the encoding of this, without the need to reflect
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// http://msdn.microsoft.com/en-us/library/y5b434w4.aspx
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static readonly Dictionary<Type, Type[]> SimpleConvertTypes = new Dictionary<Type, Type[]>
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{
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{ typeof(sbyte), new[] { typeof(string), typeof(short), typeof(int), typeof(long), typeof(float), typeof(double), typeof(decimal) } },
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{ typeof(byte), new[] { typeof(string), typeof(short), typeof(ushort), typeof(int), typeof(uint), typeof(ulong), typeof(float), typeof(double), typeof(decimal) } },
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{ typeof(short), new[] { typeof(string), typeof(int), typeof(long), typeof(float), typeof(double), typeof(decimal) } },
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{ typeof(ushort), new[] { typeof(string), typeof(int), typeof(uint), typeof(long), typeof(ulong), typeof(float), typeof(double), typeof(decimal) } },
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{ typeof(int), new[] { typeof(string), typeof(long), typeof(float), typeof(double), typeof(decimal) } },
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{ typeof(uint), new[] { typeof(string), typeof(long), typeof(ulong), typeof(float), typeof(double), typeof(decimal) } },
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{ typeof(long), new[] { typeof(string), typeof(float), typeof(double), typeof(decimal) } },
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{ typeof(char), new[] { typeof(string), typeof(ushort), typeof(int), typeof(uint), typeof(long), typeof(ulong), typeof(float), typeof(double), typeof(decimal) } },
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{ typeof(float), new[] { typeof(string), typeof(double) } },
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{ typeof(ulong), new[] { typeof(string), typeof(float), typeof(double), typeof(decimal) } }
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};
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BindableProperty(string propertyName, Type returnType, Type declaringType, object defaultValue, BindingMode defaultBindingMode = BindingMode.OneWay,
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ValidateValueDelegate validateValue = null, BindingPropertyChangedDelegate propertyChanged = null, BindingPropertyChangingDelegate propertyChanging = null,
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CoerceValueDelegate coerceValue = null, BindablePropertyBindingChanging bindingChanging = null, bool isReadOnly = false, CreateDefaultValueDelegate defaultValueCreator = null)
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{
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if (propertyName == null)
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throw new ArgumentNullException("propertyName");
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if (ReferenceEquals(returnType, null))
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throw new ArgumentNullException("returnType");
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if (ReferenceEquals(declaringType, null))
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throw new ArgumentNullException("declaringType");
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// don't use Enum.IsDefined as its redonkulously expensive for what it does
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if (defaultBindingMode != BindingMode.Default && defaultBindingMode != BindingMode.OneWay && defaultBindingMode != BindingMode.OneWayToSource && defaultBindingMode != BindingMode.TwoWay)
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throw new ArgumentException("Not a valid type of BindingMode", "defaultBindingMode");
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if (defaultValue == null && Nullable.GetUnderlyingType(returnType) == null && returnType.GetTypeInfo().IsValueType)
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throw new ArgumentException("Not a valid default value", "defaultValue");
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if (defaultValue != null && !returnType.IsInstanceOfType(defaultValue))
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throw new ArgumentException("Default value did not match return type", "defaultValue");
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if (defaultBindingMode == BindingMode.Default)
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defaultBindingMode = BindingMode.OneWay;
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PropertyName = propertyName;
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ReturnType = returnType;
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ReturnTypeInfo = returnType.GetTypeInfo();
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DeclaringType = declaringType;
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DefaultValue = defaultValue;
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DefaultBindingMode = defaultBindingMode;
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PropertyChanged = propertyChanged;
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PropertyChanging = propertyChanging;
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ValidateValue = validateValue;
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CoerceValue = coerceValue;
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BindingChanging = bindingChanging;
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IsReadOnly = isReadOnly;
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DefaultValueCreator = defaultValueCreator;
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}
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public Type DeclaringType { get; private set; }
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public BindingMode DefaultBindingMode { get; private set; }
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public object DefaultValue { get; }
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public bool IsReadOnly { get; private set; }
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public string PropertyName { get; }
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public Type ReturnType { get; }
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internal BindablePropertyBindingChanging BindingChanging { get; private set; }
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internal CoerceValueDelegate CoerceValue { get; private set; }
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internal CreateDefaultValueDelegate DefaultValueCreator { get; }
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internal BindingPropertyChangedDelegate PropertyChanged { get; private set; }
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internal BindingPropertyChangingDelegate PropertyChanging { get; private set; }
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internal TypeInfo ReturnTypeInfo { get; }
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internal ValidateValueDelegate ValidateValue { get; private set; }
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[Obsolete("Create<> (generic) is obsolete as of version 2.1.0 and is no longer supported.")]
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public static BindableProperty Create<TDeclarer, TPropertyType>(Expression<Func<TDeclarer, TPropertyType>> getter, TPropertyType defaultValue, BindingMode defaultBindingMode = BindingMode.OneWay,
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ValidateValueDelegate<TPropertyType> validateValue = null, BindingPropertyChangedDelegate<TPropertyType> propertyChanged = null,
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BindingPropertyChangingDelegate<TPropertyType> propertyChanging = null, CoerceValueDelegate<TPropertyType> coerceValue = null,
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CreateDefaultValueDelegate<TDeclarer, TPropertyType> defaultValueCreator = null) where TDeclarer : BindableObject
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{
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return Create(getter, defaultValue, defaultBindingMode, validateValue, propertyChanged, propertyChanging, coerceValue, null, defaultValueCreator: defaultValueCreator);
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}
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public static BindableProperty Create(string propertyName, Type returnType, Type declaringType, object defaultValue = null, BindingMode defaultBindingMode = BindingMode.OneWay,
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ValidateValueDelegate validateValue = null, BindingPropertyChangedDelegate propertyChanged = null, BindingPropertyChangingDelegate propertyChanging = null,
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CoerceValueDelegate coerceValue = null, CreateDefaultValueDelegate defaultValueCreator = null)
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{
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return new BindableProperty(propertyName, returnType, declaringType, defaultValue, defaultBindingMode, validateValue, propertyChanged, propertyChanging, coerceValue,
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defaultValueCreator: defaultValueCreator);
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}
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[Obsolete("CreateAttached<> (generic) is obsolete as of version 2.1.0 and is no longer supported.")]
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public static BindableProperty CreateAttached<TDeclarer, TPropertyType>(Expression<Func<BindableObject, TPropertyType>> staticgetter, TPropertyType defaultValue,
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BindingMode defaultBindingMode = BindingMode.OneWay, ValidateValueDelegate<TPropertyType> validateValue = null, BindingPropertyChangedDelegate<TPropertyType> propertyChanged = null,
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BindingPropertyChangingDelegate<TPropertyType> propertyChanging = null, CoerceValueDelegate<TPropertyType> coerceValue = null,
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CreateDefaultValueDelegate<BindableObject, TPropertyType> defaultValueCreator = null)
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{
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return CreateAttached<TDeclarer, TPropertyType>(staticgetter, defaultValue, defaultBindingMode, validateValue, propertyChanged, propertyChanging, coerceValue, null,
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defaultValueCreator: defaultValueCreator);
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}
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public static BindableProperty CreateAttached(string propertyName, Type returnType, Type declaringType, object defaultValue, BindingMode defaultBindingMode = BindingMode.OneWay,
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ValidateValueDelegate validateValue = null, BindingPropertyChangedDelegate propertyChanged = null, BindingPropertyChangingDelegate propertyChanging = null,
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CoerceValueDelegate coerceValue = null, CreateDefaultValueDelegate defaultValueCreator = null)
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{
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return CreateAttached(propertyName, returnType, declaringType, defaultValue, defaultBindingMode, validateValue, propertyChanged, propertyChanging, coerceValue, null, false, defaultValueCreator);
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}
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[Obsolete("CreateAttachedReadOnly<> (generic) is obsolete as of version 2.1.0 and is no longer supported.")]
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public static BindablePropertyKey CreateAttachedReadOnly<TDeclarer, TPropertyType>(Expression<Func<BindableObject, TPropertyType>> staticgetter, TPropertyType defaultValue,
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BindingMode defaultBindingMode = BindingMode.OneWayToSource, ValidateValueDelegate<TPropertyType> validateValue = null,
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BindingPropertyChangedDelegate<TPropertyType> propertyChanged = null, BindingPropertyChangingDelegate<TPropertyType> propertyChanging = null,
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CoerceValueDelegate<TPropertyType> coerceValue = null, CreateDefaultValueDelegate<BindableObject, TPropertyType> defaultValueCreator = null)
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{
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return
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new BindablePropertyKey(CreateAttached<TDeclarer, TPropertyType>(staticgetter, defaultValue, defaultBindingMode, validateValue, propertyChanged, propertyChanging, coerceValue, null, true,
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defaultValueCreator));
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}
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public static BindablePropertyKey CreateAttachedReadOnly(string propertyName, Type returnType, Type declaringType, object defaultValue, BindingMode defaultBindingMode = BindingMode.OneWayToSource,
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ValidateValueDelegate validateValue = null, BindingPropertyChangedDelegate propertyChanged = null, BindingPropertyChangingDelegate propertyChanging = null,
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CoerceValueDelegate coerceValue = null, CreateDefaultValueDelegate defaultValueCreator = null)
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{
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return
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new BindablePropertyKey(CreateAttached(propertyName, returnType, declaringType, defaultValue, defaultBindingMode, validateValue, propertyChanged, propertyChanging, coerceValue, null, true,
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defaultValueCreator));
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}
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[Obsolete("CreateReadOnly<> (generic) is obsolete as of version 2.1.0 and is no longer supported.")]
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public static BindablePropertyKey CreateReadOnly<TDeclarer, TPropertyType>(Expression<Func<TDeclarer, TPropertyType>> getter, TPropertyType defaultValue,
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BindingMode defaultBindingMode = BindingMode.OneWayToSource, ValidateValueDelegate<TPropertyType> validateValue = null,
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BindingPropertyChangedDelegate<TPropertyType> propertyChanged = null, BindingPropertyChangingDelegate<TPropertyType> propertyChanging = null,
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CoerceValueDelegate<TPropertyType> coerceValue = null, CreateDefaultValueDelegate<TDeclarer, TPropertyType> defaultValueCreator = null) where TDeclarer : BindableObject
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{
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return new BindablePropertyKey(Create(getter, defaultValue, defaultBindingMode, validateValue, propertyChanged, propertyChanging, coerceValue, null, true, defaultValueCreator));
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}
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public static BindablePropertyKey CreateReadOnly(string propertyName, Type returnType, Type declaringType, object defaultValue, BindingMode defaultBindingMode = BindingMode.OneWayToSource,
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ValidateValueDelegate validateValue = null, BindingPropertyChangedDelegate propertyChanged = null, BindingPropertyChangingDelegate propertyChanging = null,
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CoerceValueDelegate coerceValue = null, CreateDefaultValueDelegate defaultValueCreator = null)
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{
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return
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new BindablePropertyKey(new BindableProperty(propertyName, returnType, declaringType, defaultValue, defaultBindingMode, validateValue, propertyChanged, propertyChanging, coerceValue,
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isReadOnly: true, defaultValueCreator: defaultValueCreator));
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}
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[Obsolete("Create<> (generic) is obsolete as of version 2.1.0 and is no longer supported.")]
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internal static BindableProperty Create<TDeclarer, TPropertyType>(Expression<Func<TDeclarer, TPropertyType>> getter, TPropertyType defaultValue, BindingMode defaultBindingMode,
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ValidateValueDelegate<TPropertyType> validateValue, BindingPropertyChangedDelegate<TPropertyType> propertyChanged, BindingPropertyChangingDelegate<TPropertyType> propertyChanging,
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CoerceValueDelegate<TPropertyType> coerceValue, BindablePropertyBindingChanging bindingChanging, bool isReadOnly = false,
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CreateDefaultValueDelegate<TDeclarer, TPropertyType> defaultValueCreator = null) where TDeclarer : BindableObject
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{
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if (getter == null)
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throw new ArgumentNullException("getter");
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Expression expr = getter.Body;
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var unary = expr as UnaryExpression;
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if (unary != null)
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expr = unary.Operand;
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var member = expr as MemberExpression;
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if (member == null)
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throw new ArgumentException("getter must be a MemberExpression", "getter");
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var property = (PropertyInfo)member.Member;
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ValidateValueDelegate untypedValidateValue = null;
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BindingPropertyChangedDelegate untypedBindingPropertyChanged = null;
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BindingPropertyChangingDelegate untypedBindingPropertyChanging = null;
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CoerceValueDelegate untypedCoerceValue = null;
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CreateDefaultValueDelegate untypedDefaultValueCreator = null;
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if (validateValue != null)
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untypedValidateValue = (bindable, value) => validateValue(bindable, (TPropertyType)value);
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if (propertyChanged != null)
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untypedBindingPropertyChanged = (bindable, oldValue, newValue) => propertyChanged(bindable, (TPropertyType)oldValue, (TPropertyType)newValue);
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if (propertyChanging != null)
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untypedBindingPropertyChanging = (bindable, oldValue, newValue) => propertyChanging(bindable, (TPropertyType)oldValue, (TPropertyType)newValue);
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if (coerceValue != null)
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untypedCoerceValue = (bindable, value) => coerceValue(bindable, (TPropertyType)value);
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if (defaultValueCreator != null)
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untypedDefaultValueCreator = o => defaultValueCreator((TDeclarer)o);
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return new BindableProperty(property.Name, property.PropertyType, typeof(TDeclarer), defaultValue, defaultBindingMode, untypedValidateValue, untypedBindingPropertyChanged,
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untypedBindingPropertyChanging, untypedCoerceValue, bindingChanging, isReadOnly, untypedDefaultValueCreator);
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}
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internal static BindableProperty Create(string propertyName, Type returnType, Type declaringType, object defaultValue, BindingMode defaultBindingMode, ValidateValueDelegate validateValue,
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BindingPropertyChangedDelegate propertyChanged, BindingPropertyChangingDelegate propertyChanging, CoerceValueDelegate coerceValue, BindablePropertyBindingChanging bindingChanging,
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CreateDefaultValueDelegate defaultValueCreator = null)
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{
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return new BindableProperty(propertyName, returnType, declaringType, defaultValue, defaultBindingMode, validateValue, propertyChanged, propertyChanging, coerceValue, bindingChanging,
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defaultValueCreator: defaultValueCreator);
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}
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[Obsolete("CreateAttached<> (generic) is obsolete as of version 2.1.0 and is no longer supported.")]
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internal static BindableProperty CreateAttached<TDeclarer, TPropertyType>(Expression<Func<BindableObject, TPropertyType>> staticgetter, TPropertyType defaultValue, BindingMode defaultBindingMode,
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ValidateValueDelegate<TPropertyType> validateValue, BindingPropertyChangedDelegate<TPropertyType> propertyChanged, BindingPropertyChangingDelegate<TPropertyType> propertyChanging,
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CoerceValueDelegate<TPropertyType> coerceValue, BindablePropertyBindingChanging bindingChanging, bool isReadOnly = false,
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CreateDefaultValueDelegate<BindableObject, TPropertyType> defaultValueCreator = null)
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{
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if (staticgetter == null)
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throw new ArgumentNullException("staticgetter");
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Expression expr = staticgetter.Body;
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var unary = expr as UnaryExpression;
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if (unary != null)
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expr = unary.Operand;
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var methodcall = expr as MethodCallExpression;
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if (methodcall == null)
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throw new ArgumentException("staticgetter must be a MethodCallExpression", "staticgetter");
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MethodInfo method = methodcall.Method;
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if (!method.Name.StartsWith("Get", StringComparison.Ordinal))
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throw new ArgumentException("staticgetter name must start with Get", "staticgetter");
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string propertyname = method.Name.Substring(3);
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ValidateValueDelegate untypedValidateValue = null;
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BindingPropertyChangedDelegate untypedBindingPropertyChanged = null;
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BindingPropertyChangingDelegate untypedBindingPropertyChanging = null;
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CoerceValueDelegate untypedCoerceValue = null;
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CreateDefaultValueDelegate untypedDefaultValueCreator = null;
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if (validateValue != null)
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untypedValidateValue = (bindable, value) => validateValue(bindable, (TPropertyType)value);
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if (propertyChanged != null)
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untypedBindingPropertyChanged = (bindable, oldValue, newValue) => propertyChanged(bindable, (TPropertyType)oldValue, (TPropertyType)newValue);
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if (propertyChanging != null)
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untypedBindingPropertyChanging = (bindable, oldValue, newValue) => propertyChanging(bindable, (TPropertyType)oldValue, (TPropertyType)newValue);
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if (coerceValue != null)
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untypedCoerceValue = (bindable, value) => coerceValue(bindable, (TPropertyType)value);
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if (defaultValueCreator != null)
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untypedDefaultValueCreator = o => defaultValueCreator(o);
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return new BindableProperty(propertyname, method.ReturnType, typeof(TDeclarer), defaultValue, defaultBindingMode, untypedValidateValue, untypedBindingPropertyChanged, untypedBindingPropertyChanging,
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untypedCoerceValue, bindingChanging, isReadOnly, untypedDefaultValueCreator);
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}
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internal static BindableProperty CreateAttached(string propertyName, Type returnType, Type declaringType, object defaultValue, BindingMode defaultBindingMode, ValidateValueDelegate validateValue,
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BindingPropertyChangedDelegate propertyChanged, BindingPropertyChangingDelegate propertyChanging, CoerceValueDelegate coerceValue, BindablePropertyBindingChanging bindingChanging,
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bool isReadOnly, CreateDefaultValueDelegate defaultValueCreator = null)
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{
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return new BindableProperty(propertyName, returnType, declaringType, defaultValue, defaultBindingMode, validateValue, propertyChanged, propertyChanging, coerceValue, bindingChanging, isReadOnly,
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defaultValueCreator);
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}
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internal object GetDefaultValue(BindableObject bindable)
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{
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if (DefaultValueCreator != null)
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return DefaultValueCreator(bindable);
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return DefaultValue;
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}
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internal bool TryConvert(ref object value)
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{
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if (value == null)
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{
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return !ReturnTypeInfo.IsValueType || ReturnTypeInfo.IsGenericType && ReturnTypeInfo.GetGenericTypeDefinition() == typeof(Nullable<>);
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}
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Type valueType = value.GetType();
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Type type = ReturnType;
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// Dont support arbitrary IConvertible by limiting which types can use this
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Type[] convertableTo;
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TypeConverter typeConverterTo;
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if (SimpleConvertTypes.TryGetValue(valueType, out convertableTo) && Array.IndexOf(convertableTo, type) != -1)
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{
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value = Convert.ChangeType(value, type);
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}
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else if (WellKnownConvertTypes.TryGetValue(type, out typeConverterTo) && typeConverterTo.CanConvertFrom(valueType))
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{
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value = typeConverterTo.ConvertFromInvariantString(value.ToString());
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}
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else if (!ReturnTypeInfo.IsAssignableFrom(valueType.GetTypeInfo()))
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{
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// Is there an implicit cast operator ?
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MethodInfo cast = type.GetRuntimeMethod("op_Implicit", new[] { valueType });
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if (cast != null && cast.ReturnType != type)
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cast = null;
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if (cast == null)
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cast = valueType.GetRuntimeMethod("op_Implicit", new[] { valueType });
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if (cast != null && cast.ReturnType != type)
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cast = null;
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if (cast == null)
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return false;
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value = cast.Invoke(null, new[] { value });
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}
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return true;
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}
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internal delegate void BindablePropertyBindingChanging(BindableObject bindable, BindingBase oldValue, BindingBase newValue);
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}
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} |