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Now, two way bindings work as expected and setting a local value on a property with a binding sets the value temporarily until the binding changes value.pull/58/head
Steven Kirk
11 years ago
10 changed files with 559 additions and 289 deletions
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// -----------------------------------------------------------------------
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// <copyright file="IPerspexPropertyBinding.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.Diagnostics |
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{ |
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public interface IPerspexPropertyBinding |
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{ |
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string Description { get; } |
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int Priority { get; } |
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object Value { get; } |
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} |
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} |
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// -----------------------------------------------------------------------
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// <copyright file="PerspexPropertyBinding.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.Diagnostics |
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{ |
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internal class PerspexPropertyBinding : IPerspexPropertyBinding |
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{ |
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public string Description { get; set; } |
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public int Priority { get; set; } |
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public object Value { get; set; } |
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} |
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} |
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// -----------------------------------------------------------------------
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// <copyright file="PriorityValue.cs" company="Steven Kirk">
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// Copyright 2014 MIT Licence. See licence.md for more information.
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// </copyright>
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// -----------------------------------------------------------------------
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namespace Perspex |
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{ |
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using Perspex.Diagnostics; |
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using System; |
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/// <summary>
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/// A registered binding in a <see cref="PriorityValue"/>.
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/// </summary>
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internal class PriorityBindingEntry : IDisposable |
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{ |
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/// <summary>
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/// The binding subscription.
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/// </summary>
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private IDisposable subscription; |
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public PriorityBindingEntry(int index) |
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{ |
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this.Index = index; |
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} |
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/// <summary>
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/// Gets a description of the binding.
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/// </summary>
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public string Description |
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{ |
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get; |
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private set; |
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} |
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public int Index |
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{ |
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get; |
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} |
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/// <summary>
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/// The current value of the binding.
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/// </summary>
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public object Value |
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{ |
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get; |
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private set; |
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} |
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/// <summary>
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/// Starts listening to the binding.
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/// </summary>
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/// <param name="binding">The binding.</param>
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/// <param name="changed">Called when the binding changes.</param>
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/// <param name="completed">Called when the binding completes.</param>
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public void Start( |
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IObservable<object> binding, |
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Action<PriorityBindingEntry> changed, |
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Action<PriorityBindingEntry> completed) |
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{ |
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Contract.Requires<ArgumentNullException>(binding != null); |
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Contract.Requires<ArgumentNullException>(changed != null); |
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Contract.Requires<ArgumentNullException>(completed != null); |
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if (this.subscription != null) |
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{ |
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throw new Exception("PriorityValue.Entry.Start() called more than once."); |
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} |
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this.Value = PerspexProperty.UnsetValue; |
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if (binding is IDescription) |
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{ |
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this.Description = ((IDescription)binding).Description; |
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} |
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this.subscription = binding.Subscribe( |
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value => |
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{ |
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this.Value = value; |
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changed(this); |
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}, |
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() => completed(this)); |
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} |
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/// <summary>
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/// Ends the binding subscription.
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/// </summary>
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public void Dispose() |
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{ |
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if (this.subscription != null) |
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{ |
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this.subscription.Dispose(); |
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} |
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} |
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} |
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} |
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// -----------------------------------------------------------------------
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// <copyright file="PriorityValueTests.cs" company="Steven Kirk">
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// Copyright 2013 MIT Licence. See licence.md for more information.
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// </copyright>
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// -----------------------------------------------------------------------
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namespace Perspex |
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{ |
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using System; |
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using System.Collections.Generic; |
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using System.Reactive.Disposables; |
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internal class PriorityLevel |
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{ |
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private Action<PriorityLevel> changed; |
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private object directValue; |
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private int nextIndex; |
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public PriorityLevel( |
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int priority, |
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Action<PriorityLevel> changed) |
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{ |
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Contract.Requires<ArgumentNullException>(changed != null); |
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this.changed = changed; |
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this.Priority = priority; |
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this.Value = this.directValue = PerspexProperty.UnsetValue; |
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this.ActiveBindingIndex = -1; |
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this.Bindings = new LinkedList<PriorityBindingEntry>(); |
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} |
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public int Priority { get; } |
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public object DirectValue |
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{ |
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get |
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{ |
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return this.directValue; |
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} |
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set |
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{ |
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this.Value = this.directValue = value; |
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this.changed(this); |
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} |
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} |
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public object Value { get; private set; } |
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public int ActiveBindingIndex { get; private set; } |
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public LinkedList<PriorityBindingEntry> Bindings { get; } |
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public IDisposable Add(IObservable<object> binding) |
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{ |
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Contract.Requires<ArgumentNullException>(binding != null); |
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var entry = new PriorityBindingEntry(this.nextIndex++); |
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var node = this.Bindings.AddFirst(entry); |
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entry.Start(binding, this.Changed, this.Completed); |
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return Disposable.Create(() => |
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{ |
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this.Bindings.Remove(node); |
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if (entry.Index >= this.ActiveBindingIndex) |
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{ |
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this.ActivateFirstBinding(); |
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} |
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}); |
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} |
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private void Changed(PriorityBindingEntry entry) |
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{ |
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if (entry.Index >= this.ActiveBindingIndex) |
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{ |
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if (entry.Value != PerspexProperty.UnsetValue) |
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{ |
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this.Value = entry.Value; |
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this.ActiveBindingIndex = entry.Index; |
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this.changed(this); |
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} |
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else |
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{ |
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this.ActivateFirstBinding(); |
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} |
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} |
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} |
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private void Completed(PriorityBindingEntry entry) |
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{ |
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this.Bindings.Remove(entry); |
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if (entry.Index >= this.ActiveBindingIndex) |
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{ |
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this.ActivateFirstBinding(); |
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} |
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} |
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private void ActivateFirstBinding() |
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{ |
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foreach (var binding in this.Bindings) |
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{ |
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if (binding.Value != PerspexProperty.UnsetValue) |
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{ |
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this.Value = binding.Value; |
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this.ActiveBindingIndex = binding.Index; |
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this.changed(this); |
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return; |
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} |
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} |
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this.Value = this.DirectValue; |
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this.ActiveBindingIndex = -1; |
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this.changed(this); |
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} |
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} |
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} |
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