Steven Kirk
3 years ago
20 changed files with 212 additions and 90 deletions
@ -1,10 +1,31 @@ |
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using Avalonia.Styling; |
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using Avalonia.PropertyStore; |
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using Avalonia.Styling; |
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namespace Avalonia.Data.Core; |
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public abstract class BindingExpressionBase : ISetterInstance |
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public abstract class BindingExpressionBase : IBindingExpression, ISetterInstance |
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{ |
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private protected BindingExpressionBase() |
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{ |
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} |
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internal BindingMode Mode { get; private protected set; } |
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public virtual void Dispose() |
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{ |
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} |
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/// <summary>
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/// When overridden in a derived class, attaches the binding expression to a value store but
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/// does not start it.
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/// </summary>
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/// <param name="valueStore">The value store to attach to.</param>
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/// <param name="target">The target object.</param>
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/// <param name="targetProperty">The target property.</param>
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/// <param name="priority">The priority of the binding.</param>
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internal abstract void Attach( |
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ValueStore valueStore, |
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AvaloniaObject target, |
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AvaloniaProperty targetProperty, |
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BindingPriority priority); |
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} |
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@ -0,0 +1,99 @@ |
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using Avalonia.Controls; |
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using Avalonia.Data; |
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using Avalonia.Data.Core; |
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using Avalonia.UnitTests; |
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using Xunit; |
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namespace Avalonia.Base.UnitTests.Data.Core |
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{ |
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[InvariantCulture] |
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public class BindingExpressionTests_Mode |
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{ |
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[Fact] |
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public void OneTime_Binding_Sets_Target_Only_Once() |
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{ |
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var data = new ViewModel(); |
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var binding = new Binding(nameof(data.Foo), BindingMode.OneTime); |
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var target = new Control { DataContext = data }; |
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target.Bind(Control.TagProperty, binding); |
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Assert.Equal("foo", target.Tag); |
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data.Foo = "bar"; |
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Assert.Equal("foo", target.Tag); |
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} |
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[Fact] |
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public void OneTime_Binding_Waits_For_DataContext() |
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{ |
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var data = new ViewModel(); |
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var binding = new Binding(nameof(data.Foo), BindingMode.OneTime); |
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var target = new Control(); |
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target.Bind(Control.TagProperty, binding); |
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Assert.Null(target.Tag); |
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target.DataContext = data; |
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Assert.Equal("foo", target.Tag); |
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data.Foo = "bar"; |
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Assert.Equal("foo", target.Tag); |
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} |
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[Fact] |
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public void OneTime_Binding_Waits_For_DataContext_With_Matching_Property_Name() |
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{ |
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var data1 = new { Baz = "baz" }; |
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var data2 = new ViewModel(); |
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var binding = new Binding(nameof(data2.Foo), BindingMode.OneTime); |
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var target = new Control { DataContext = data1 }; |
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target.Bind(Control.TagProperty, binding); |
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Assert.Null(target.Tag); |
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target.DataContext = data2; |
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Assert.Equal("foo", target.Tag); |
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data2.Foo = "bar"; |
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Assert.Equal("foo", target.Tag); |
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} |
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private class ViewModel : NotifyingBase |
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{ |
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private string _foo; |
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private double _bar; |
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public ViewModel(string foo = "foo", double bar = 0.5) |
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{ |
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_foo = foo; |
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_bar = bar; |
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} |
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public string Foo |
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{ |
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get => _foo; |
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set |
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{ |
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if (_foo != value) |
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{ |
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_foo = value; |
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RaisePropertyChanged(); |
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} |
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} |
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} |
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public double Bar |
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{ |
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get => _bar; |
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set |
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{ |
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if (_bar != value) |
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{ |
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_bar = value; |
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RaisePropertyChanged(); |
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} |
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} |
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} |
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} |
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} |
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} |
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