Steven Kirk
8 years ago
committed by
GitHub
GitHub
28 changed files with 508 additions and 262 deletions
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using System; |
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using System.Collections.Generic; |
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using Avalonia.Data; |
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namespace Avalonia |
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{ |
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internal class ValueStore : IPriorityValueOwner |
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{ |
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private readonly AvaloniaObject _owner; |
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private readonly Dictionary<AvaloniaProperty, object> _values = |
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new Dictionary<AvaloniaProperty, object>(); |
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public ValueStore(AvaloniaObject owner) |
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{ |
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_owner = owner; |
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} |
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public IDisposable AddBinding( |
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AvaloniaProperty property, |
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IObservable<object> source, |
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BindingPriority priority) |
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{ |
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PriorityValue priorityValue; |
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if (_values.TryGetValue(property, out var v)) |
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{ |
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priorityValue = v as PriorityValue; |
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if (priorityValue == null) |
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{ |
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priorityValue = CreatePriorityValue(property); |
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priorityValue.SetValue(v, (int)BindingPriority.LocalValue); |
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_values[property] = priorityValue; |
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} |
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} |
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else |
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{ |
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priorityValue = CreatePriorityValue(property); |
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_values.Add(property, priorityValue); |
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} |
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return priorityValue.Add(source, (int)priority); |
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} |
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public void AddValue(AvaloniaProperty property, object value, int priority) |
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{ |
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PriorityValue priorityValue; |
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if (_values.TryGetValue(property, out var v)) |
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{ |
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priorityValue = v as PriorityValue; |
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if (priorityValue == null) |
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{ |
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if (priority == (int)BindingPriority.LocalValue) |
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{ |
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_values[property] = Validate(property, value); |
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Changed(property, priority, v, value); |
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return; |
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} |
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else |
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{ |
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priorityValue = CreatePriorityValue(property); |
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priorityValue.SetValue(v, (int)BindingPriority.LocalValue); |
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_values[property] = priorityValue; |
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} |
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} |
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} |
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else |
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{ |
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if (value == AvaloniaProperty.UnsetValue) |
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{ |
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return; |
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} |
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if (priority == (int)BindingPriority.LocalValue) |
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{ |
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_values.Add(property, Validate(property, value)); |
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Changed(property, priority, AvaloniaProperty.UnsetValue, value); |
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return; |
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} |
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else |
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{ |
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priorityValue = CreatePriorityValue(property); |
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_values.Add(property, priorityValue); |
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} |
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} |
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priorityValue.SetValue(value, priority); |
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} |
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public void BindingNotificationReceived(AvaloniaProperty property, BindingNotification notification) |
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{ |
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((IPriorityValueOwner)_owner).BindingNotificationReceived(property, notification); |
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} |
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public void Changed(AvaloniaProperty property, int priority, object oldValue, object newValue) |
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{ |
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((IPriorityValueOwner)_owner).Changed(property, priority, oldValue, newValue); |
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} |
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public IDictionary<AvaloniaProperty, PriorityValue> GetSetValues() => throw new NotImplementedException(); |
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public object GetValue(AvaloniaProperty property) |
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{ |
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var result = AvaloniaProperty.UnsetValue; |
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if (_values.TryGetValue(property, out var value)) |
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{ |
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result = (value is PriorityValue priorityValue) ? priorityValue.Value : value; |
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} |
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return result; |
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} |
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public bool IsAnimating(AvaloniaProperty property) |
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{ |
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return _values.TryGetValue(property, out var value) ? (value as PriorityValue)?.IsAnimating ?? false : false; |
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} |
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public bool IsSet(AvaloniaProperty property) |
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{ |
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if (_values.TryGetValue(property, out var value)) |
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{ |
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return ((value as PriorityValue)?.Value ?? value) != AvaloniaProperty.UnsetValue; |
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} |
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return false; |
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} |
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public void Revalidate(AvaloniaProperty property) |
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{ |
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if (_values.TryGetValue(property, out var value)) |
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{ |
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(value as PriorityValue)?.Revalidate(); |
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} |
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} |
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public void VerifyAccess() => _owner.VerifyAccess(); |
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private PriorityValue CreatePriorityValue(AvaloniaProperty property) |
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{ |
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var validate = ((IStyledPropertyAccessor)property).GetValidationFunc(_owner.GetType()); |
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Func<object, object> validate2 = null; |
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if (validate != null) |
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{ |
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validate2 = v => validate(_owner, v); |
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} |
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PriorityValue result = new PriorityValue( |
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this, |
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property, |
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property.PropertyType, |
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validate2); |
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return result; |
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} |
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private object Validate(AvaloniaProperty property, object value) |
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{ |
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var validate = ((IStyledPropertyAccessor)property).GetValidationFunc(_owner.GetType()); |
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if (validate != null && value != AvaloniaProperty.UnsetValue) |
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{ |
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return validate(_owner, value); |
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} |
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return value; |
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} |
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} |
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} |
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@ -1,51 +0,0 @@ |
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// Copyright (c) The Avalonia Project. All rights reserved.
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// Licensed under the MIT license. See licence.md file in the project root for full license information.
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using Avalonia.Data; |
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namespace Avalonia.Markup.Xaml.MarkupExtensions |
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{ |
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using System; |
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using Avalonia.Data.Converters; |
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using Avalonia.Markup.Data; |
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using Portable.Xaml.Markup; |
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[MarkupExtensionReturnType(typeof(IBinding))] |
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public class TemplateBindingExtension : MarkupExtension |
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{ |
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public TemplateBindingExtension() |
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{ |
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} |
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public TemplateBindingExtension(string path) |
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{ |
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Path = path; |
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} |
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public override object ProvideValue(IServiceProvider serviceProvider) |
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{ |
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return new Binding |
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{ |
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Converter = Converter, |
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ElementName = ElementName, |
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Mode = Mode, |
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RelativeSource = new RelativeSource(RelativeSourceMode.TemplatedParent), |
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Path = Path ?? string.Empty, |
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Priority = Priority, |
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}; |
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} |
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public IValueConverter Converter { get; set; } |
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public string ElementName { get; set; } |
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public object FallbackValue { get; set; } |
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public BindingMode Mode { get; set; } |
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[ConstructorArgument("path")] |
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public string Path { get; set; } |
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public BindingPriority Priority { get; set; } = BindingPriority.TemplatedParent; |
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} |
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} |
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@ -0,0 +1,178 @@ |
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using System; |
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using System.Globalization; |
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using System.Reactive.Subjects; |
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using Avalonia.Data.Converters; |
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using Avalonia.Reactive; |
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namespace Avalonia.Data |
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{ |
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/// <summary>
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/// A XAML binding to a property on a control's templated parent.
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/// </summary>
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public class TemplateBinding : SingleSubscriberObservableBase<object>, |
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IBinding, |
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IDescription, |
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ISubject<object> |
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{ |
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private IStyledElement _target; |
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private Type _targetType; |
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public TemplateBinding() |
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{ |
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} |
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public TemplateBinding(AvaloniaProperty property) |
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{ |
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Property = property; |
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} |
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/// <inheritdoc/>
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public InstancedBinding Initiate( |
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IAvaloniaObject target, |
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AvaloniaProperty targetProperty, |
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object anchor = null, |
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bool enableDataValidation = false) |
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{ |
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// Usually each `TemplateBinding` will only be instantiated once; in this case we can
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// use the `TemplateBinding` object itself as the instanced binding in order to save
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// allocating a new object. If the binding *is* instantiated more than once (which can
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// happen if it appears in a `Setter` for example, then just make a clone and instantiate
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// that.
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if (_target == null) |
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{ |
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_target = (IStyledElement)target; |
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_targetType = targetProperty?.PropertyType; |
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return new InstancedBinding( |
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this, |
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Mode == BindingMode.Default ? BindingMode.OneWay : Mode, |
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BindingPriority.TemplatedParent); |
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} |
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else |
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{ |
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var clone = new TemplateBinding |
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{ |
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Converter = Converter, |
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ConverterParameter = ConverterParameter, |
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Property = Property, |
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}; |
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return clone.Initiate(target, targetProperty, anchor, enableDataValidation); |
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} |
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} |
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/// <summary>
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/// Gets or sets the <see cref="IValueConverter"/> to use.
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/// </summary>
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public IValueConverter Converter { get; set; } |
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/// <summary>
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/// Gets or sets a parameter to pass to <see cref="Converter"/>.
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/// </summary>
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public object ConverterParameter { get; set; } |
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/// <summary>
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/// Gets or sets the binding mode.
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/// </summary>
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public BindingMode Mode { get; set; } |
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/// <summary>
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/// Gets or sets the name of the source property on the templated parent.
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/// </summary>
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public AvaloniaProperty Property { get; set; } |
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/// <inheritdoc/>
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public string Description => "TemplateBinding: " + Property; |
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void IObserver<object>.OnCompleted() => throw new NotImplementedException(); |
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void IObserver<object>.OnError(Exception error) => throw new NotImplementedException(); |
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void IObserver<object>.OnNext(object value) |
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{ |
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if (_target.TemplatedParent != null && Property != null) |
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{ |
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if (Converter != null) |
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{ |
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value = Converter.ConvertBack( |
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value, |
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Property.PropertyType, |
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ConverterParameter, |
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CultureInfo.CurrentCulture); |
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} |
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_target.TemplatedParent.SetValue(Property, value, BindingPriority.TemplatedParent); |
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} |
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} |
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protected override void Subscribed() |
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{ |
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TemplatedParentChanged(); |
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_target.PropertyChanged += TargetPropertyChanged; |
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} |
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protected override void Unsubscribed() |
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{ |
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if (_target.TemplatedParent != null) |
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{ |
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_target.TemplatedParent.PropertyChanged -= TemplatedParentPropertyChanged; |
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} |
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_target.PropertyChanged -= TargetPropertyChanged; |
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} |
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private void PublishValue() |
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{ |
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if (_target.TemplatedParent != null) |
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{ |
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var value = Property != null ? |
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_target.TemplatedParent.GetValue(Property) : |
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_target.TemplatedParent; |
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if (Converter != null) |
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{ |
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value = Converter.Convert(value, _targetType, ConverterParameter, CultureInfo.CurrentCulture); |
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} |
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PublishNext(value); |
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} |
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else |
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{ |
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PublishNext(AvaloniaProperty.UnsetValue); |
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} |
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} |
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private void TemplatedParentChanged() |
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{ |
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if (_target.TemplatedParent != null) |
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{ |
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_target.TemplatedParent.PropertyChanged += TemplatedParentPropertyChanged; |
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} |
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PublishValue(); |
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} |
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private void TargetPropertyChanged(object sender, AvaloniaPropertyChangedEventArgs e) |
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{ |
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if (e.Property == StyledElement.TemplatedParentProperty) |
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{ |
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var oldValue = (IAvaloniaObject)e.OldValue; |
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var newValue = (IAvaloniaObject)e.OldValue; |
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if (oldValue != null) |
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{ |
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oldValue.PropertyChanged -= TemplatedParentPropertyChanged; |
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} |
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TemplatedParentChanged(); |
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} |
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} |
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private void TemplatedParentPropertyChanged(object sender, AvaloniaPropertyChangedEventArgs e) |
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{ |
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if (e.Property == Property) |
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{ |
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PublishNext(_target.TemplatedParent.GetValue(Property)); |
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} |
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} |
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} |
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} |
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