Browse Source
Conflicts: samples/XamlTestApplication/ViewModels/MainWindowViewModel.cs samples/XamlTestApplication/ViewModels/TestItem.cs samples/XamlTestApplication/Views/MainWindow.paml src/Markup/Perspex.Markup.Xaml/DataBinding/XamlBinding.cs src/Markup/Perspex.Markup.Xaml/DataBinding/XamlBindingDefinition.cs src/Markup/Perspex.Markup.Xaml/MarkupExtensions/BindingExtension.cspull/237/head
Steven Kirk
11 years ago
25 changed files with 110 additions and 672 deletions
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// Copyright (c) The Perspex 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 System; |
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using System.Collections.Generic; |
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using System.ComponentModel; |
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using System.Linq; |
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using System.Reactive.Linq; |
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using System.Reflection; |
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using Glass; |
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namespace Perspex.Markup.Xaml.DataBinding.ChangeTracking |
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{ |
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public class ObservablePropertyBranch |
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{ |
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private readonly object _instance; |
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private readonly PropertyPath _propertyPath; |
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private readonly PropertyMountPoint _mountPoint; |
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public ObservablePropertyBranch(object instance, PropertyPath propertyPath) |
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{ |
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Guard.ThrowIfNull(instance, nameof(instance)); |
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Guard.ThrowIfNull(propertyPath, nameof(propertyPath)); |
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_instance = instance; |
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_propertyPath = propertyPath; |
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_mountPoint = new PropertyMountPoint(instance, propertyPath); |
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var properties = GetPropertiesThatRaiseNotifications(); |
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Values = CreateUnifiedObservableFromNodes(properties); |
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} |
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public IObservable<object> Values { get; private set; } |
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private IObservable<object> CreateUnifiedObservableFromNodes(IEnumerable<PropertyDefinition> subscriptions) |
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{ |
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return subscriptions.Select(GetObservableFromProperty).Merge(); |
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} |
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private IObservable<object> GetObservableFromProperty(PropertyDefinition subscription) |
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{ |
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return Observable.FromEventPattern<PropertyChangedEventHandler, PropertyChangedEventArgs>( |
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parentOnPropertyChanged => subscription.Parent.PropertyChanged += parentOnPropertyChanged, |
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parentOnPropertyChanged => subscription.Parent.PropertyChanged -= parentOnPropertyChanged) |
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.Where(pattern => pattern.EventArgs.PropertyName == subscription.PropertyName) |
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.Select(pattern => _mountPoint.Value); |
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} |
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private IEnumerable<PropertyDefinition> GetPropertiesThatRaiseNotifications() |
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{ |
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return GetSubscriptionsRecursive(_instance, _propertyPath, 0); |
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} |
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private IEnumerable<PropertyDefinition> GetSubscriptionsRecursive(object current, PropertyPath propertyPath, int i) |
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{ |
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var subscriptions = new List<PropertyDefinition>(); |
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var inpc = current as INotifyPropertyChanged; |
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if (inpc == null) |
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{ |
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return subscriptions; |
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} |
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var nextPropertyName = propertyPath.Chunks[i]; |
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subscriptions.Add(new PropertyDefinition(inpc, nextPropertyName)); |
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if (i < _propertyPath.Chunks.Length) |
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{ |
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var currentObjectTypeInfo = current.GetType().GetTypeInfo(); |
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var nextProperty = currentObjectTypeInfo.GetDeclaredProperty(nextPropertyName); |
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var nextInstance = nextProperty.GetValue(current); |
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if (i < _propertyPath.Chunks.Length - 1) |
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{ |
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subscriptions.AddRange(GetSubscriptionsRecursive(nextInstance, propertyPath, i + 1)); |
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} |
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} |
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return subscriptions; |
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} |
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public object Value |
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{ |
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get |
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{ |
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return _mountPoint.Value; |
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} |
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set |
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{ |
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_mountPoint.Value = value; |
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} |
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} |
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public Type Type => _mountPoint.ProperyType; |
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private class PropertyDefinition |
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{ |
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public PropertyDefinition(INotifyPropertyChanged parent, string propertyName) |
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{ |
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Parent = parent; |
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PropertyName = propertyName; |
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} |
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public INotifyPropertyChanged Parent { get; } |
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public string PropertyName { get; } |
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} |
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} |
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} |
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@ -1,52 +0,0 @@ |
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// Copyright (c) The Perspex 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 System; |
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using System.Reflection; |
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using Glass; |
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namespace Perspex.Markup.Xaml.DataBinding.ChangeTracking |
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{ |
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public class PropertyMountPoint |
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{ |
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private readonly TargettedProperty _referencedTargettedProperty; |
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public PropertyMountPoint(object origin, PropertyPath propertyPath) |
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{ |
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Guard.ThrowIfNull(origin, nameof(origin)); |
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Guard.ThrowIfNull(propertyPath, nameof(propertyPath)); |
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_referencedTargettedProperty = GetReferencedPropertyInfo(origin, propertyPath, 0); |
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} |
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private static TargettedProperty GetReferencedPropertyInfo(object current, PropertyPath propertyPath, int level) |
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{ |
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var typeInfo = current.GetType().GetTypeInfo(); |
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var leftPropertyInfo = typeInfo.GetDeclaredProperty(propertyPath.Chunks[level]); |
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if (level == propertyPath.Chunks.Length - 1) |
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{ |
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return new TargettedProperty(current, leftPropertyInfo); |
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} |
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var nextInstance = leftPropertyInfo.GetValue(current); |
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return GetReferencedPropertyInfo(nextInstance, propertyPath, level + 1); |
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} |
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public object Value |
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{ |
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get |
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{ |
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return _referencedTargettedProperty.Value; |
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} |
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set |
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{ |
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_referencedTargettedProperty.Value = value; |
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} |
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} |
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public Type ProperyType => _referencedTargettedProperty.PropertyType; |
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} |
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} |
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@ -1,36 +0,0 @@ |
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// Copyright (c) The Perspex 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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namespace Perspex.Markup.Xaml.DataBinding.ChangeTracking |
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{ |
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public class PropertyPath |
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{ |
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private string[] _chunks; |
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private PropertyPath(PropertyPath propertyPath) |
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{ |
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_chunks = propertyPath.Chunks; |
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} |
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public PropertyPath(string path) |
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{ |
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_chunks = path.Split('.'); |
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} |
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public string[] Chunks |
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{ |
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get { return _chunks; } |
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set { _chunks = value; } |
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} |
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public PropertyPath Clone() |
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{ |
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return new PropertyPath(this); |
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} |
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public override string ToString() |
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{ |
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return string.Join(".", _chunks); |
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} |
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} |
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} |
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// Copyright (c) The Perspex 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 System; |
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using System.Reflection; |
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using Glass; |
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namespace Perspex.Markup.Xaml.DataBinding.ChangeTracking |
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{ |
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internal class TargettedProperty |
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{ |
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private readonly object _instance; |
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private readonly PropertyInfo _propertyInfo; |
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public TargettedProperty(object instance, PropertyInfo propertyInfo) |
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{ |
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Guard.ThrowIfNull(instance, nameof(instance)); |
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Guard.ThrowIfNull(propertyInfo, nameof(propertyInfo)); |
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_instance = instance; |
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_propertyInfo = propertyInfo; |
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} |
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public object Value |
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{ |
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get |
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{ |
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return _propertyInfo.GetValue(_instance); |
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} |
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set |
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{ |
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_propertyInfo.SetValue(_instance, value); |
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} |
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} |
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public Type PropertyType => _propertyInfo.PropertyType; |
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public string Name => _propertyInfo.Name; |
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} |
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} |
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@ -1,165 +0,0 @@ |
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// Copyright (c) The Perspex 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 System; |
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using System.Globalization; |
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using System.Reactive.Linq; |
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using System.Reflection; |
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using Glass; |
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using OmniXaml.TypeConversion; |
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using Perspex.Markup.Xaml.DataBinding.ChangeTracking; |
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namespace Perspex.Markup.Xaml.DataBinding |
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{ |
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public class DataContextChangeSynchronizer |
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{ |
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private readonly BindingTarget _bindingTarget; |
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private readonly ITypeConverter _targetPropertyTypeConverter; |
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private readonly TargetBindingEndpoint _bindingEndpoint; |
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private readonly ObservablePropertyBranch _sourceEndpoint; |
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public DataContextChangeSynchronizer(BindingSource bindingSource, BindingTarget bindingTarget, ITypeConverterProvider typeConverterProvider) |
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{ |
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_bindingTarget = bindingTarget; |
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Guard.ThrowIfNull(bindingTarget.Object, nameof(bindingTarget.Object)); |
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Guard.ThrowIfNull(bindingTarget.Property, nameof(bindingTarget.Property)); |
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Guard.ThrowIfNull(bindingSource.SourcePropertyPath, nameof(bindingSource.SourcePropertyPath)); |
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Guard.ThrowIfNull(bindingSource.Source, nameof(bindingSource.Source)); |
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Guard.ThrowIfNull(typeConverterProvider, nameof(typeConverterProvider)); |
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_bindingEndpoint = new TargetBindingEndpoint(bindingTarget.Object, bindingTarget.Property); |
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_sourceEndpoint = new ObservablePropertyBranch(bindingSource.Source, bindingSource.SourcePropertyPath); |
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_targetPropertyTypeConverter = typeConverterProvider.GetTypeConverter(bindingTarget.Property.PropertyType); |
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} |
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public class BindingTarget |
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{ |
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private readonly PerspexObject _obj; |
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private readonly PerspexProperty _property; |
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public BindingTarget(PerspexObject @object, PerspexProperty property) |
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{ |
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_obj = @object; |
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_property = property; |
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} |
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public PerspexObject Object => _obj; |
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public PerspexProperty Property => _property; |
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public object Value |
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{ |
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get { return _obj.GetValue(_property); } |
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set { _obj.SetValue(_property, value); } |
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} |
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} |
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public class BindingSource |
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{ |
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private readonly PropertyPath _sourcePropertyPath; |
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private readonly object _source; |
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public BindingSource(PropertyPath sourcePropertyPath, object source) |
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{ |
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_sourcePropertyPath = sourcePropertyPath; |
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_source = source; |
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} |
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public PropertyPath SourcePropertyPath => _sourcePropertyPath; |
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public object Source => _source; |
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} |
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public void StartUpdatingTargetWhenSourceChanges() |
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{ |
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// TODO: commenting out this line will make the existing value to be skipped from the SourceValues. This is not supposed to happen. Is it?
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_bindingTarget.Value = ConvertedValue(_sourceEndpoint.Value, _bindingTarget.Property.PropertyType); |
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// We use the native Bind method from PerspexObject to subscribe to the SourceValues observable
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_bindingTarget.Object.Bind(_bindingTarget.Property, SourceValues); |
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} |
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public void StartUpdatingSourceWhenTargetChanges() |
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{ |
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// We subscribe to the TargetValues and each time we have a new value, we update the source with it
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TargetValues.Subscribe(newValue => _sourceEndpoint.Value = newValue); |
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} |
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private IObservable<object> SourceValues |
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{ |
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get |
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{ |
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return _sourceEndpoint.Values.Select(originalValue => ConvertedValue(originalValue, _bindingTarget.Property.PropertyType)); |
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} |
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} |
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private IObservable<object> TargetValues |
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{ |
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get |
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{ |
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return _bindingEndpoint.Object |
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.GetObservable(_bindingEndpoint.Property).Select(o => ConvertedValue(o, _sourceEndpoint.Type)); |
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} |
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} |
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private bool CanAssignWithoutConversion |
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{ |
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get |
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{ |
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var sourceTypeInfo = _sourceEndpoint.Type.GetTypeInfo(); |
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var targetTypeInfo = _bindingEndpoint.Property.PropertyType.GetTypeInfo(); |
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var compatible = targetTypeInfo.IsAssignableFrom(sourceTypeInfo); |
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return compatible; |
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} |
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} |
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private object ConvertedValue(object originalValue, Type propertyType) |
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{ |
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object converted; |
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if (TryConvert(originalValue, propertyType, out converted)) |
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{ |
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return converted; |
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} |
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return null; |
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} |
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private bool TryConvert(object originalValue, Type targetType, out object finalValue) |
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{ |
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if (originalValue != null) |
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{ |
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if (CanAssignWithoutConversion) |
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{ |
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finalValue = originalValue; |
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return true; |
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} |
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if (_targetPropertyTypeConverter != null) |
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{ |
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if (_targetPropertyTypeConverter.CanConvertTo(null, targetType)) |
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{ |
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object convertedValue = _targetPropertyTypeConverter.ConvertTo( |
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null, |
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CultureInfo.InvariantCulture, |
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originalValue, |
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targetType); |
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if (convertedValue != null) |
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{ |
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finalValue = convertedValue; |
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return true; |
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} |
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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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finalValue = null; |
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return true; |
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} |
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finalValue = null; |
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return false; |
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} |
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} |
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} |
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@ -0,0 +1,48 @@ |
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// Copyright (c) The Perspex 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 System; |
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using System.Reactive.Linq; |
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using System.Reactive.Subjects; |
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namespace Perspex.Markup.Binding |
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{ |
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/// <summary>
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/// Turns an <see cref="ExpressionObserver"/> into a subject that can be bound two-ways.
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/// </summary>
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public class ExpressionSubject : ISubject<object> |
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{ |
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private ExpressionObserver _inner; |
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/// <summary>
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/// Initializes a new instance of the <see cref="ExpressionObserver"/> class.
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/// </summary>
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/// <param name="inner">The <see cref="ExpressionObserver"/>.</param>
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public ExpressionSubject(ExpressionObserver inner) |
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{ |
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_inner = inner; |
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} |
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/// <inheritdoc/>
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public void OnCompleted() |
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{ |
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} |
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/// <inheritdoc/>
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public void OnError(Exception error) |
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{ |
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} |
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/// <inheritdoc/>
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public void OnNext(object value) |
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{ |
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_inner.SetValue(value); |
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} |
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/// <inheritdoc/>
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public IDisposable Subscribe(IObserver<object> observer) |
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{ |
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return _inner.Select(x => x.Value).Distinct().Subscribe(observer); |
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} |
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} |
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} |
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@ -1,72 +0,0 @@ |
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// Copyright (c) The Perspex 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 System; |
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using Perspex.Markup.Xaml.DataBinding.ChangeTracking; |
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using Perspex.Xaml.Base.UnitTest.SampleModel; |
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using Xunit; |
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namespace Perspex.Xaml.Base.UnitTest |
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{ |
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public class ChangeBranchTest |
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{ |
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[Fact] |
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public void GetValueOfMemberOfStruct() |
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{ |
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var level1 = new Level1(); |
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level1.DateTime = new DateTime(1, 2, 3, 4, 5, 6); |
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var branch = new ObservablePropertyBranch(level1, new PropertyPath("DateTime.Minute")); |
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var day = branch.Value; |
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Assert.Equal(day, branch.Value); |
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} |
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[Fact] |
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public void OnePathOnly() |
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{ |
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var level1 = new Level1(); |
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var branch = new ObservablePropertyBranch(level1, new PropertyPath("Text")); |
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var newValue = "Hey now"; |
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branch.Value = newValue; |
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Assert.Equal(level1.Text, newValue); |
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} |
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[Fact] |
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public void SettingValueToUnderlyingProperty_ChangesTheValueInBranch() |
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{ |
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var level1 = new Level1(); |
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level1.Level2.Level3.Property = 3; |
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var branch = new ObservablePropertyBranch(level1, new PropertyPath("Level2.Level3.Property")); |
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Assert.Equal(3, branch.Value); |
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} |
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[Fact] |
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public void SettingValueToBranch_ChangesTheUnderlyingProperty() |
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{ |
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var level1 = new Level1(); |
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var branch = new ObservablePropertyBranch(level1, new PropertyPath("Level2.Level3.Property")); |
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branch.Value = 3; |
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Assert.Equal(3, level1.Level2.Level3.Property); |
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} |
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[Fact] |
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public void SettingValueProperty_RaisesChangeInBranch() |
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{ |
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var level1 = new Level1(); |
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var branch = new ObservablePropertyBranch(level1, new PropertyPath("Level2.Level3.Property")); |
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bool received = false; |
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ObservableExtensions.Subscribe(branch.Values, v => received = ((int)v == 3)); |
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level1.Level2.Level3.Property = 3; |
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Assert.True(received); |
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} |
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} |
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} |
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@ -1,103 +0,0 @@ |
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// Copyright (c) The Perspex 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 System; |
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using Perspex.Controls; |
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using GitHubClient.ViewModels; |
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using Perspex.Markup.Xaml.DataBinding; |
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using Perspex.Markup.Xaml.DataBinding.ChangeTracking; |
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using OmniXaml.Builder; |
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using OmniXaml.TypeConversion; |
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using OmniXaml.TypeConversion.BuiltInConverters; |
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using Perspex.Xaml.Base.UnitTest.SampleModel; |
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using Xunit; |
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namespace Perspex.Xaml.Base.UnitTest |
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{ |
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public class DataContextChangeSynchronizerTest |
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{ |
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private readonly TypeConverterProvider _repo; |
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private readonly SamplePerspexObject _guiObject; |
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private readonly ViewModelMock _viewModel; |
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public DataContextChangeSynchronizerTest() |
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{ |
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_repo = new TypeConverterProvider(); |
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_guiObject = new SamplePerspexObject(); |
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_viewModel = new ViewModelMock(); |
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} |
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[Fact] |
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public void SameTypesFromUIToModel() |
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{ |
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var synchronizer = new DataContextChangeSynchronizer(new DataContextChangeSynchronizer.BindingSource(new PropertyPath("IntProp"), _viewModel), new DataContextChangeSynchronizer.BindingTarget(_guiObject, SamplePerspexObject.IntProperty), _repo); |
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synchronizer.StartUpdatingSourceWhenTargetChanges(); |
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const int someValue = 4; |
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_guiObject.Int = someValue; |
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Assert.Equal(someValue, _viewModel.IntProp); |
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} |
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[Fact] |
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public void DifferentTypesFromUIToModel() |
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{ |
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var synchronizer = new DataContextChangeSynchronizer(new DataContextChangeSynchronizer.BindingSource(new PropertyPath("IntProp"), _viewModel), new DataContextChangeSynchronizer.BindingTarget(_guiObject, SamplePerspexObject.StringProperty), _repo); |
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synchronizer.StartUpdatingSourceWhenTargetChanges(); |
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_guiObject.String = "2"; |
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Assert.Equal(2, _viewModel.IntProp); |
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} |
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[Fact] |
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public void DifferentTypesAndNonConvertibleValueFromUIToModel() |
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{ |
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var synchronizer = new DataContextChangeSynchronizer(new DataContextChangeSynchronizer.BindingSource(new PropertyPath("IntProp"), _viewModel), new DataContextChangeSynchronizer.BindingTarget(_guiObject, SamplePerspexObject.StringProperty), _repo); |
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synchronizer.StartUpdatingSourceWhenTargetChanges(); |
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_guiObject.String = ""; |
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Assert.Equal(default(int), _viewModel.IntProp); |
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} |
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[Fact] |
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public void DifferentTypesFromModelToUI() |
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{ |
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var synchronizer = new DataContextChangeSynchronizer(new DataContextChangeSynchronizer.BindingSource(new PropertyPath("IntProp"), _viewModel), new DataContextChangeSynchronizer.BindingTarget(_guiObject, SamplePerspexObject.StringProperty), _repo); |
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synchronizer.StartUpdatingTargetWhenSourceChanges(); |
|||
|
|||
_viewModel.IntProp = 2; |
|||
|
|||
Assert.Equal("2", _guiObject.String); |
|||
} |
|||
|
|||
[Fact] |
|||
public void SameTypesFromModelToUI() |
|||
{ |
|||
var synchronizer = new DataContextChangeSynchronizer(new DataContextChangeSynchronizer.BindingSource(new PropertyPath("IntProp"), _viewModel), new DataContextChangeSynchronizer.BindingTarget(_guiObject, SamplePerspexObject.IntProperty), _repo); |
|||
synchronizer.StartUpdatingTargetWhenSourceChanges(); |
|||
|
|||
_viewModel.IntProp = 2; |
|||
|
|||
Assert.Equal(2, _guiObject.Int); |
|||
} |
|||
|
|||
[Fact] |
|||
public void GrokysTest() |
|||
{ |
|||
var mainWindowViewModel = new MainWindowViewModel(); |
|||
var contentControl = new ContentControl(); |
|||
|
|||
var synchronizer = new DataContextChangeSynchronizer(new DataContextChangeSynchronizer.BindingSource(new PropertyPath("Content"), mainWindowViewModel), new DataContextChangeSynchronizer.BindingTarget(contentControl, ContentControl.ContentProperty), _repo); |
|||
|
|||
synchronizer.StartUpdatingTargetWhenSourceChanges(); |
|||
|
|||
var logInViewModel = new LogInViewModel(); |
|||
mainWindowViewModel.Content = logInViewModel; |
|||
|
|||
Assert.Equal(logInViewModel, contentControl.Content); |
|||
} |
|||
} |
|||
} |
|||
@ -1,18 +0,0 @@ |
|||
// Copyright (c) The Perspex Project. All rights reserved.
|
|||
// Licensed under the MIT license. See licence.md file in the project root for full license information.
|
|||
|
|||
using Perspex.Markup.Xaml.DataBinding.ChangeTracking; |
|||
using System; |
|||
using Xunit; |
|||
|
|||
namespace Perspex.Xaml.Base.UnitTest |
|||
{ |
|||
public class PropertyMountPointTest |
|||
{ |
|||
[Fact] |
|||
public void SourceAndPathAreNull() |
|||
{ |
|||
Assert.Throws<ArgumentNullException>(() => new PropertyMountPoint(null, null)); |
|||
} |
|||
} |
|||
} |
|||
Loading…
Reference in new issue