danwalmsley
8 years ago
committed by
GitHub
GitHub
9 changed files with 34 additions and 359 deletions
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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 System; |
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using System.Reactive.Disposables; |
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using System.Reactive.Linq; |
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using System.Reactive.Subjects; |
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using Avalonia.Controls; |
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using Avalonia.Data; |
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using Avalonia.Styling; |
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namespace Avalonia.Markup.Xaml.Data |
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{ |
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public class StyleResourceBinding : IBinding |
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{ |
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/// <summary>
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/// Initializes a new instance of the <see cref="StyleResourceBinding"/> class.
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/// </summary>
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/// <param name="name">The resource name.</param>
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public StyleResourceBinding(string name) |
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{ |
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Name = name; |
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} |
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/// <inheritdoc/>
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public BindingMode Mode => BindingMode.OneTime; |
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/// <summary>
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/// Gets the resource name.
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/// </summary>
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public string Name { get; } |
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/// <inheritdoc/>
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public BindingPriority Priority => BindingPriority.LocalValue; |
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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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var host = (target as IControl) ?? (anchor as IControl); |
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var style = anchor as IStyle; |
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var resource = AvaloniaProperty.UnsetValue; |
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if (host != null) |
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{ |
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resource = host.FindResource(Name); |
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} |
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else if (style != null) |
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{ |
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if (!style.TryGetResource(Name, out resource)) |
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{ |
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resource = AvaloniaProperty.UnsetValue; |
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} |
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} |
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if (resource != AvaloniaProperty.UnsetValue) |
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{ |
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return new InstancedBinding(resource, Priority); |
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} |
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else |
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{ |
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return null; |
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} |
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} |
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} |
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} |
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@ -1,31 +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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using Avalonia.Markup.Xaml.Data; |
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using System; |
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namespace Avalonia.Markup.Xaml.MarkupExtensions |
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{ |
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using Portable.Xaml.Markup; |
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using PortableXaml; |
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[MarkupExtensionReturnType(typeof(IBinding))] |
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public class StyleResourceExtension : MarkupExtension |
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{ |
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public StyleResourceExtension(string name) |
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{ |
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Name = name; |
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} |
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public override object ProvideValue(IServiceProvider serviceProvider) |
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{ |
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return XamlBinding.FromMarkupExtensionContext( |
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new StyleResourceBinding(Name), |
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serviceProvider); |
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} |
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[ConstructorArgument("name")] |
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public string Name { get; set; } |
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} |
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} |
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@ -1,63 +0,0 @@ |
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using Avalonia.Controls; |
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using Avalonia.Data; |
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using Avalonia.Styling; |
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using Portable.Xaml; |
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using Portable.Xaml.ComponentModel; |
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using System.ComponentModel; |
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using Portable.Xaml.Markup; |
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using System; |
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namespace Avalonia.Markup.Xaml.PortableXaml |
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{ |
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internal class XamlBinding : IBinding |
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{ |
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public static IBinding FromMarkupExtensionContext( |
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IBinding binding, |
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IServiceProvider serviceProvider) |
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{ |
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var context = (ITypeDescriptorContext)serviceProvider; |
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var pvt = context.GetService<IProvideValueTarget>(); |
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if (pvt.TargetObject is IControl) return binding; |
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object anchor = GetDefaultAnchor(context); |
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if (anchor == null) return binding; |
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return new XamlBinding(binding, anchor); |
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} |
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private static object GetDefaultAnchor(ITypeDescriptorContext context) |
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{ |
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object anchor = null; |
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// The target is not a control, so we need to find an anchor that will let us look
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// up named controls and style resources. First look for the closest IControl in
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// the context.
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anchor = context.GetFirstAmbientValue<IControl>(); |
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// If a control was not found, then try to find the highest-level style as the XAML
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// file could be a XAML file containing only styles.
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return anchor ?? |
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context.GetService<IRootObjectProvider>()?.RootObject as IStyle ?? |
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context.GetLastOrDefaultAmbientValue<IStyle>(); |
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} |
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private XamlBinding(IBinding binding, object anchor) |
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{ |
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Value = binding; |
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Anchor = new WeakReference(anchor); |
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} |
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public WeakReference Anchor { get; } |
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public IBinding Value { get; } |
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public InstancedBinding Initiate(IAvaloniaObject target, AvaloniaProperty targetProperty, object anchor = null, bool enableDataValidation = false) |
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{ |
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return Value.Initiate(target, targetProperty, |
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anchor ?? Anchor.Target, enableDataValidation); |
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} |
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} |
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} |
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