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@ -1,3 +1,9 @@ |
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// -----------------------------------------------------------------------
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// <copyright file="DataContextChangeSynchronizer.cs" company="Steven Kirk">
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// Copyright 2015 MIT Licence. See licence.md for more information.
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// </copyright>
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// -----------------------------------------------------------------------
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namespace Perspex.Markup.Xaml.DataBinding |
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{ |
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using System; |
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@ -23,17 +29,17 @@ namespace Perspex.Markup.Xaml.DataBinding |
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Guard.ThrowIfNull(source, nameof(source)); |
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Guard.ThrowIfNull(typeConverterProvider, nameof(typeConverterProvider)); |
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bindingEndpoint = new TargetBindingEndpoint(target, targetProperty); |
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sourceEndpoint = new ObservablePropertyBranch(source, sourcePropertyPath); |
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targetPropertyTypeConverter = typeConverterProvider.GetTypeConverter(targetProperty.PropertyType); |
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this.bindingEndpoint = new TargetBindingEndpoint(target, targetProperty); |
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this.sourceEndpoint = new ObservablePropertyBranch(source, sourcePropertyPath); |
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this.targetPropertyTypeConverter = typeConverterProvider.GetTypeConverter(targetProperty.PropertyType); |
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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 sourceTypeInfo = this.sourceEndpoint.Type.GetTypeInfo(); |
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var targetTypeInfo = this.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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@ -41,19 +47,19 @@ namespace Perspex.Markup.Xaml.DataBinding |
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public void SubscribeModelToUI() |
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{ |
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bindingEndpoint.Object.GetObservable(bindingEndpoint.Property).Subscribe(UpdateModelFromUI); |
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} |
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this.bindingEndpoint.Object.GetObservable(this.bindingEndpoint.Property).Subscribe(this.UpdateModelFromUI); |
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} |
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public void SubscribeUIToModel() |
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{ |
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sourceEndpoint.Changed.Subscribe(_ => UpdateUIFromModel()); |
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UpdateUIFromModel(); |
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this.sourceEndpoint.Changed.Subscribe(_ => this.UpdateUIFromModel()); |
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this.UpdateUIFromModel(); |
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} |
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private void UpdateUIFromModel() |
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{ |
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object contextGetter = sourceEndpoint.Value; |
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SetCompatibleValue(contextGetter, bindingEndpoint.Property.PropertyType, o => bindingEndpoint.Object.SetValue(bindingEndpoint.Property, o)); |
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object contextGetter = this.sourceEndpoint.Value; |
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this.SetCompatibleValue(contextGetter, this.bindingEndpoint.Property.PropertyType, o => this.bindingEndpoint.Object.SetValue(this.bindingEndpoint.Property, o)); |
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} |
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private void SetCompatibleValue(object originalValue, Type targetType, Action<object> setValueFunc) |
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@ -64,7 +70,7 @@ namespace Perspex.Markup.Xaml.DataBinding |
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} |
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else |
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{ |
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if (CanAssignWithoutConversion) |
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if (this.CanAssignWithoutConversion) |
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{ |
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setValueFunc(originalValue); |
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} |
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@ -72,11 +78,11 @@ namespace Perspex.Markup.Xaml.DataBinding |
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{ |
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var synchronizationOk = false; |
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if (targetPropertyTypeConverter != null) |
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if (this.targetPropertyTypeConverter != null) |
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{ |
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if (targetPropertyTypeConverter.CanConvertTo(null, targetType)) |
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if (this.targetPropertyTypeConverter.CanConvertTo(null, targetType)) |
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{ |
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object convertedValue = targetPropertyTypeConverter.ConvertTo(null, CultureInfo.InvariantCulture, originalValue, |
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object convertedValue = this.targetPropertyTypeConverter.ConvertTo(null, CultureInfo.InvariantCulture, originalValue, |
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targetType); |
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if (convertedValue != null) |
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@ -89,7 +95,7 @@ namespace Perspex.Markup.Xaml.DataBinding |
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if (!synchronizationOk) |
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{ |
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LogCannotConvertError(originalValue); |
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this.LogCannotConvertError(originalValue); |
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} |
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} |
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} |
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@ -97,7 +103,7 @@ namespace Perspex.Markup.Xaml.DataBinding |
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private void UpdateModelFromUI(object valueFromUI) |
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{ |
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SetCompatibleValue(valueFromUI, sourceEndpoint.Type, o => sourceEndpoint.Value = o); |
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this.SetCompatibleValue(valueFromUI, this.sourceEndpoint.Type, o => this.sourceEndpoint.Value = o); |
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} |
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private void LogCannotConvertError(object value) |
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@ -107,7 +113,7 @@ namespace Perspex.Markup.Xaml.DataBinding |
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var loggableValue = value.ToString(); |
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var valueToWrite = string.IsNullOrWhiteSpace(loggableValue) ? "'(empty/whitespace string)'" : loggableValue; |
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Debug.WriteLine("Cannot convert value {0} ({1}) to {2}", valueToWrite, value.GetType(), bindingEndpoint.Property.PropertyType); |
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} |
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Debug.WriteLine("Cannot convert value {0} ({1}) to {2}", valueToWrite, value.GetType(), this.bindingEndpoint.Property.PropertyType); |
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} |
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} |
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} |
Steven Kirk
11 years ago