danwalmsley
7 years ago
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GitHub
GitHub
27 changed files with 294 additions and 391 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.Linq; |
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using System.Reactive.Disposables; |
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using System.Runtime.CompilerServices; |
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using Avalonia.Collections; |
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using Avalonia.Controls.Presenters; |
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using Avalonia.Controls.Primitives; |
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using Avalonia.Interactivity; |
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using Avalonia.LogicalTree; |
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namespace Avalonia.Controls.Mixins |
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{ |
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/// <summary>
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/// Adds content control functionality to control classes.
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/// </summary>
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/// <para>
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/// The <see cref="ContentControlMixin"/> adds behavior to a control which acts as a content
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/// control such as <see cref="ContentControl"/> and <see cref="HeaderedItemsControl"/>. It
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/// keeps the control's logical children in sync with the content being displayed by the
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/// control.
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/// </para>
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public class ContentControlMixin |
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{ |
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private static Lazy<ConditionalWeakTable<TemplatedControl, IDisposable>> subscriptions = |
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new Lazy<ConditionalWeakTable<TemplatedControl, IDisposable>>(() => |
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new ConditionalWeakTable<TemplatedControl, IDisposable>()); |
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/// <summary>
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/// Initializes a new instance of the <see cref="SelectableMixin"/> class.
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/// </summary>
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/// <typeparam name="TControl">The control type.</typeparam>
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/// <param name="content">The content property.</param>
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/// <param name="logicalChildrenSelector">
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/// Given an control of <typeparamref name="TControl"/> should return the control's
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/// logical children collection.
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/// </param>
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/// <param name="presenterName">
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/// The name of the content presenter in the control's template.
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/// </param>
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public static void Attach<TControl>( |
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AvaloniaProperty content, |
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Func<TControl, IAvaloniaList<ILogical>> logicalChildrenSelector, |
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string presenterName = "PART_ContentPresenter") |
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where TControl : TemplatedControl |
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{ |
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Contract.Requires<ArgumentNullException>(content != null); |
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Contract.Requires<ArgumentNullException>(logicalChildrenSelector != null); |
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void ChildChanging(object s, AvaloniaPropertyChangedEventArgs e) |
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{ |
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if (s is IControl sender && sender?.TemplatedParent is TControl parent) |
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{ |
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UpdateLogicalChild( |
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sender, |
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logicalChildrenSelector(parent), |
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e.OldValue, |
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null); |
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} |
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} |
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void TemplateApplied(object s, RoutedEventArgs ev) |
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{ |
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if (s is TControl sender) |
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{ |
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var e = (TemplateAppliedEventArgs)ev; |
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var presenter = e.NameScope.Find(presenterName) as IContentPresenter; |
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if (presenter != null) |
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{ |
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presenter.ApplyTemplate(); |
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var logicalChildren = logicalChildrenSelector(sender); |
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var subscription = new CompositeDisposable(); |
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presenter.ChildChanging += ChildChanging; |
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subscription.Add(Disposable.Create(() => presenter.ChildChanging -= ChildChanging)); |
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subscription.Add(presenter |
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.GetPropertyChangedObservable(ContentPresenter.ChildProperty) |
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.Subscribe(c => UpdateLogicalChild( |
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sender, |
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logicalChildren, |
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null, |
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c.NewValue))); |
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UpdateLogicalChild( |
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sender, |
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logicalChildren, |
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null, |
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presenter.GetValue(ContentPresenter.ChildProperty)); |
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if (subscriptions.Value.TryGetValue(sender, out IDisposable previousSubscription)) |
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{ |
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subscription = new CompositeDisposable(previousSubscription, subscription); |
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subscriptions.Value.Remove(sender); |
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} |
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subscriptions.Value.Add(sender, subscription); |
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} |
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} |
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} |
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TemplatedControl.TemplateAppliedEvent.AddClassHandler( |
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typeof(TControl), |
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TemplateApplied, |
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RoutingStrategies.Direct); |
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content.Changed.Subscribe(e => |
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{ |
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if (e.Sender is TControl sender) |
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{ |
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var logicalChildren = logicalChildrenSelector(sender); |
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UpdateLogicalChild(sender, logicalChildren, e.OldValue, e.NewValue); |
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} |
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}); |
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Control.TemplatedParentProperty.Changed.Subscribe(e => |
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{ |
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if (e.Sender is TControl sender) |
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{ |
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var logicalChild = logicalChildrenSelector(sender).FirstOrDefault() as IControl; |
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logicalChild?.SetValue(Control.TemplatedParentProperty, sender.TemplatedParent); |
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} |
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}); |
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TemplatedControl.TemplateProperty.Changed.Subscribe(e => |
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{ |
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if (e.Sender is TControl sender) |
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{ |
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if (subscriptions.Value.TryGetValue(sender, out IDisposable subscription)) |
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{ |
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subscription.Dispose(); |
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subscriptions.Value.Remove(sender); |
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} |
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} |
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}); |
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} |
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private static void UpdateLogicalChild( |
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IControl control, |
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IAvaloniaList<ILogical> logicalChildren, |
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object oldValue, |
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object newValue) |
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{ |
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if (oldValue != newValue) |
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{ |
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if (oldValue is IControl child) |
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{ |
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logicalChildren.Remove(child); |
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((ISetInheritanceParent)child).SetParent(child.Parent); |
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} |
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child = newValue as IControl; |
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if (child != null && !logicalChildren.Contains(child)) |
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{ |
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child.SetValue(Control.TemplatedParentProperty, control.TemplatedParent); |
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logicalChildren.Add(child); |
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} |
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} |
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} |
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} |
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} |
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@ -1,107 +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 System.Collections.Generic; |
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using System.Linq; |
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using Avalonia.Collections; |
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using Avalonia.Controls.Mixins; |
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using Avalonia.Controls.Presenters; |
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using Avalonia.Controls.Primitives; |
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using Avalonia.Controls.Templates; |
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using Avalonia.LogicalTree; |
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using Moq; |
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using Xunit; |
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namespace Avalonia.Controls.UnitTests.Mixins |
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{ |
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public class ContentControlMixinTests |
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{ |
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[Fact] |
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public void Multiple_Mixin_Usages_Should_Not_Throw() |
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{ |
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var target = new TestControl() |
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{ |
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Template = new FuncControlTemplate((_, scope) => new Panel |
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{ |
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Children = |
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{ |
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new ContentPresenter {Name = "Content_1_Presenter"}.RegisterInNameScope(scope), |
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new ContentPresenter {Name = "Content_2_Presenter"}.RegisterInNameScope(scope) |
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} |
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}) |
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}; |
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var ex = Record.Exception(() => target.ApplyTemplate()); |
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Assert.Null(ex); |
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} |
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[Fact] |
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public void Replacing_Template_Releases_Events() |
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{ |
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var p1 = new ContentPresenter { Name = "Content_1_Presenter" }; |
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var p2 = new ContentPresenter { Name = "Content_2_Presenter" }; |
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var target = new TestControl |
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{ |
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Template = new FuncControlTemplate((_, scope) => new Panel |
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{ |
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Children = |
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{ |
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p1.RegisterInNameScope(scope), |
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p2.RegisterInNameScope(scope) |
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} |
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}) |
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}; |
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target.ApplyTemplate(); |
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Control tc; |
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p1.Content = tc = new Control(); |
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p1.UpdateChild(); |
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Assert.Contains(tc, target.GetLogicalChildren()); |
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p2.Content = tc = new Control(); |
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p2.UpdateChild(); |
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Assert.Contains(tc, target.GetLogicalChildren()); |
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target.Template = null; |
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p1.Content = tc = new Control(); |
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p1.UpdateChild(); |
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Assert.DoesNotContain(tc, target.GetLogicalChildren()); |
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p2.Content = tc = new Control(); |
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p2.UpdateChild(); |
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Assert.DoesNotContain(tc, target.GetLogicalChildren()); |
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} |
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private class TestControl : TemplatedControl |
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{ |
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public static readonly StyledProperty<object> Content1Property = |
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AvaloniaProperty.Register<TestControl, object>(nameof(Content1)); |
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public static readonly StyledProperty<object> Content2Property = |
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AvaloniaProperty.Register<TestControl, object>(nameof(Content2)); |
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static TestControl() |
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{ |
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ContentControlMixin.Attach<TestControl>(Content1Property, x => x.LogicalChildren, "Content_1_Presenter"); |
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ContentControlMixin.Attach<TestControl>(Content2Property, x => x.LogicalChildren, "Content_2_Presenter"); |
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} |
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public object Content1 |
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{ |
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get { return GetValue(Content1Property); } |
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set { SetValue(Content1Property, value); } |
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} |
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public object Content2 |
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{ |
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get { return GetValue(Content2Property); } |
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set { SetValue(Content2Property, value); } |
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} |
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} |
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} |
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} |
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