Benedikt Stebner
4 years ago
committed by
GitHub
GitHub
22 changed files with 269 additions and 333 deletions
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using System; |
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using System.Diagnostics.CodeAnalysis; |
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using System.Reflection; |
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using Avalonia.Data; |
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using Avalonia.PropertyStore; |
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using Avalonia.Reactive; |
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using Avalonia.Styling; |
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using Avalonia.Utilities; |
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namespace Avalonia |
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{ |
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/// <summary>
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/// Base class for styled properties.
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/// </summary>
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public abstract class StyledPropertyBase<TValue> : AvaloniaProperty<TValue>, IStyledPropertyAccessor |
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{ |
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private readonly bool _inherits; |
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/// <summary>
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/// Initializes a new instance of the <see cref="StyledPropertyBase{T}"/> class.
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/// </summary>
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/// <param name="name">The name of the property.</param>
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/// <param name="ownerType">The type of the class that registers the property.</param>
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/// <param name="metadata">The property metadata.</param>
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/// <param name="inherits">Whether the property inherits its value.</param>
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/// <param name="validate">A value validation callback.</param>
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/// <param name="notifying">A <see cref="AvaloniaProperty.Notifying"/> callback.</param>
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protected StyledPropertyBase( |
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string name, |
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Type ownerType, |
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StyledPropertyMetadata<TValue> metadata, |
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bool inherits = false, |
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Func<TValue, bool>? validate = null, |
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Action<AvaloniaObject, bool>? notifying = null) |
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: base(name, ownerType, metadata, notifying) |
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{ |
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_inherits = inherits; |
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ValidateValue = validate; |
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HasCoercion |= metadata.CoerceValue != null; |
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if (validate?.Invoke(metadata.DefaultValue) == false) |
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{ |
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throw new ArgumentException( |
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$"'{metadata.DefaultValue}' is not a valid default value for '{name}'."); |
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} |
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} |
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/// <summary>
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/// Initializes a new instance of the <see cref="StyledPropertyBase{T}"/> class.
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/// </summary>
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/// <param name="source">The property to add the owner to.</param>
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/// <param name="ownerType">The type of the class that registers the property.</param>
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protected StyledPropertyBase(StyledPropertyBase<TValue> source, Type ownerType) |
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: base(source, ownerType, null) |
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{ |
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_inherits = source.Inherits; |
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} |
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/// <summary>
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/// Gets a value indicating whether the property inherits its value.
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/// </summary>
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/// <value>
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/// A value indicating whether the property inherits its value.
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/// </value>
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public override bool Inherits => _inherits; |
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/// <summary>
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/// Gets the value validation callback for the property.
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/// </summary>
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public Func<TValue, bool>? ValidateValue { get; } |
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/// <summary>
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/// Gets a value indicating whether this property has any value coercion callbacks defined
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/// in its metadata.
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/// </summary>
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internal bool HasCoercion { get; private set; } |
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public TValue CoerceValue(AvaloniaObject instance, TValue baseValue) |
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{ |
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var metadata = GetMetadata(instance.GetType()); |
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if (metadata.CoerceValue != null) |
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{ |
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return metadata.CoerceValue.Invoke(instance, baseValue); |
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} |
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return baseValue; |
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} |
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/// <summary>
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/// Gets the default value for the property on the specified type.
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/// </summary>
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/// <param name="type">The type.</param>
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/// <returns>The default value.</returns>
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public TValue GetDefaultValue(Type type) |
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{ |
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return GetMetadata(type).DefaultValue; |
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} |
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/// <summary>
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/// Gets the property metadata for the specified type.
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/// </summary>
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/// <param name="type">The type.</param>
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/// <returns>
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/// The property metadata.
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/// </returns>
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public new StyledPropertyMetadata<TValue> GetMetadata(Type type) |
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{ |
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_ = type ?? throw new ArgumentNullException(nameof(type)); |
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return (StyledPropertyMetadata<TValue>)base.GetMetadata(type); |
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} |
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/// <summary>
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/// Overrides the default value for the property on the specified type.
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/// </summary>
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/// <typeparam name="T">The type.</typeparam>
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/// <param name="defaultValue">The default value.</param>
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public void OverrideDefaultValue<T>(TValue defaultValue) where T : AvaloniaObject |
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{ |
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OverrideDefaultValue(typeof(T), defaultValue); |
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} |
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/// <summary>
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/// Overrides the default value for the property on the specified type.
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/// </summary>
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/// <param name="type">The type.</param>
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/// <param name="defaultValue">The default value.</param>
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public void OverrideDefaultValue(Type type, TValue defaultValue) |
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{ |
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OverrideMetadata(type, new StyledPropertyMetadata<TValue>(defaultValue)); |
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} |
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/// <summary>
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/// Overrides the metadata for the property on the specified type.
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/// </summary>
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/// <typeparam name="T">The type.</typeparam>
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/// <param name="metadata">The metadata.</param>
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public void OverrideMetadata<T>(StyledPropertyMetadata<TValue> metadata) where T : AvaloniaObject |
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{ |
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base.OverrideMetadata(typeof(T), metadata); |
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} |
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/// <summary>
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/// Overrides the metadata for the property on the specified type.
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/// </summary>
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/// <param name="type">The type.</param>
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/// <param name="metadata">The metadata.</param>
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public void OverrideMetadata(Type type, StyledPropertyMetadata<TValue> metadata) |
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{ |
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if (ValidateValue != null) |
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{ |
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if (!ValidateValue(metadata.DefaultValue)) |
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{ |
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throw new ArgumentException( |
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$"'{metadata.DefaultValue}' is not a valid default value for '{Name}'."); |
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} |
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} |
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HasCoercion |= metadata.CoerceValue != null; |
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base.OverrideMetadata(type, metadata); |
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} |
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/// <summary>
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/// Gets the string representation of the property.
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/// </summary>
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/// <returns>The property's string representation.</returns>
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public override string ToString() |
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{ |
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return Name; |
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} |
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/// <inheritdoc/>
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object? IStyledPropertyAccessor.GetDefaultValue(Type type) => GetDefaultBoxedValue(type); |
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bool IStyledPropertyAccessor.ValidateValue(object? value) |
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{ |
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if (value is null && !typeof(TValue).IsValueType) |
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return ValidateValue?.Invoke(default!) ?? true; |
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if (value is TValue typed) |
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return ValidateValue?.Invoke(typed) ?? true; |
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return false; |
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} |
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internal override EffectiveValue CreateEffectiveValue(AvaloniaObject o) |
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{ |
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return new EffectiveValue<TValue>(o, this); |
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} |
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/// <inheritdoc/>
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internal override void RouteClearValue(AvaloniaObject o) |
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{ |
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o.ClearValue<TValue>(this); |
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} |
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/// <inheritdoc/>
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internal override object? RouteGetValue(AvaloniaObject o) |
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{ |
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return o.GetValue<TValue>(this); |
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} |
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/// <inheritdoc/>
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internal override object? RouteGetBaseValue(AvaloniaObject o) |
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{ |
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var value = o.GetBaseValue<TValue>(this); |
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return value.HasValue ? value.Value : AvaloniaProperty.UnsetValue; |
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} |
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/// <inheritdoc/>
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[UnconditionalSuppressMessage("Trimming", "IL2026", Justification = TrimmingMessages.ImplicitTypeConvertionSupressWarningMessage)] |
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internal override IDisposable? RouteSetValue( |
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AvaloniaObject target, |
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object? value, |
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BindingPriority priority) |
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{ |
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if (value == BindingOperations.DoNothing) |
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{ |
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return null; |
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} |
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else if (value == UnsetValue) |
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{ |
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target.ClearValue(this); |
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return null; |
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} |
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else if (TypeUtilities.TryConvertImplicit(PropertyType, value, out var converted)) |
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{ |
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return target.SetValue<TValue>(this, (TValue)converted!, priority); |
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} |
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else |
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{ |
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var type = value?.GetType().FullName ?? "(null)"; |
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throw new ArgumentException($"Invalid value for Property '{Name}': '{value}' ({type})"); |
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} |
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} |
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internal override IDisposable RouteBind( |
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AvaloniaObject target, |
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IObservable<object?> source, |
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BindingPriority priority) |
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{ |
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return target.Bind<TValue>(this, source, priority); |
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} |
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private object? GetDefaultBoxedValue(Type type) |
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{ |
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_ = type ?? throw new ArgumentNullException(nameof(type)); |
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return GetMetadata(type).DefaultValue; |
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} |
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} |
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} |
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