public void Should_Bind_To_Element()
{
TextBlock source;
ContentControl target;
var root = new TestRoot
{
Child = new StackPanel
{
Children = new Controls.Controls
{
(source = new TextBlock
{
Name = "source",
Text = "foo",
}),
(target = new ContentControl
{
Name = "target",
})
}
}
};
var binding = new Binding
{
ElementName = "source",
};
binding.Bind(target, ContentControl.ContentProperty);
Assert.Same(source, target.Content);
}
public void Should_Bind_To_Element_Path()
{
TextBlock target;
var root = new TestRoot
{
Child = new StackPanel
{
Children = new Controls.Controls
{
new TextBlock
{
Name = "source",
Text = "foo",
},
(target = new TextBlock
{
Name = "target",
})
}
}
};
var binding = new Binding
{
ElementName = "source",
Path = "Text",
};
binding.Bind(target, TextBlock.TextProperty);
Assert.Equal("foo", target.Text);
}
public void OneTime_Binding_Should_Be_Set_Up()
{
var dataContext = new BehaviorSubject<object>(null);
var expression = new BehaviorSubject<object>(null);
var target = CreateTarget(dataContext: dataContext);
var binding = new Binding
{
Path = "Foo",
Mode = BindingMode.OneTime,
};
binding.Bind(target.Object, TextBox.TextProperty, expression);
target.Verify(x => x.SetValue(
(PerspexProperty)TextBox.TextProperty,
null,
BindingPriority.LocalValue));
target.ResetCalls();
expression.OnNext("foo");
dataContext.OnNext(1);
target.Verify(x => x.SetValue(
(PerspexProperty)TextBox.TextProperty,
"foo",
BindingPriority.LocalValue));
}
public void Should_Bind_To_Later_Added_Element()
{
TextBlock target;
StackPanel stackPanel;
var root = new TestRoot
{
Child = stackPanel = new StackPanel
{
Children = new Controls.Controls
{
(target = new TextBlock
{
Name = "target",
}),
}
}
};
var binding = new Binding
{
ElementName = "source",
Path = "Text",
};
binding.Bind(target, TextBlock.TextProperty);
stackPanel.Children.Add(new TextBlock
{
Name = "source",
Text = "foo",
});
Assert.Equal("foo", target.Text);
}
public void Source_Should_Be_Used()
{
var source = new Source { Foo = "foo" };
var binding = new Binding { Source = source, Path = "Foo" };
var target = new TextBlock();
target.Bind(TextBlock.TextProperty, binding);
Assert.Equal(target.Text, "foo");
}
public void OneWayToSource_Binding_Should_Be_Set_Up()
{
var textObservable = new Mock<IObservable<string>>();
var expression = new Mock<ISubject<object>>();
var target = CreateTarget(text: textObservable.Object);
var binding = new Binding
{
Path = "Foo",
Mode = BindingMode.OneWayToSource,
};
binding.Bind(target.Object, TextBox.TextProperty, expression.Object);
textObservable.Verify(x => x.Subscribe(expression.Object));
}
public void OneWay_Binding_Should_Be_Set_Up()
{
var target = CreateTarget();
var binding = new Binding
{
SourcePropertyPath = "Foo",
Mode = BindingMode.OneWay,
};
binding.Bind(target.Object, TextBox.TextProperty);
target.Verify(x => x.Bind(
TextBox.TextProperty,
It.IsAny<IObservable<object>>(),
BindingPriority.LocalValue));
}
public void TwoWay_Binding_Should_Be_Set_Up()
{
var target = CreateTarget();
var binding = new Binding
{
Path = "Foo",
Mode = BindingMode.TwoWay,
};
binding.Bind(target.Object, TextBox.TextProperty);
target.Verify(x => x.BindTwoWay(
TextBox.TextProperty,
It.IsAny<ISubject<object>>(),
BindingPriority.LocalValue));
}
public void OneWay_Binding_Should_Be_Set_Up()
{
var target = CreateTarget();
var binding = new Binding
{
Mode = BindingMode.OneWay,
RelativeSource = new RelativeSource(RelativeSourceMode.TemplatedParent),
Priority = BindingPriority.TemplatedParent,
Path = "Foo",
};
target.Object.Bind(TextBox.TextProperty, binding);
target.Verify(x => x.Bind(
TextBox.TextProperty,
It.IsAny<IObservable<object>>(),
BindingPriority.TemplatedParent));
}
public void TwoWay_Binding_Should_Be_Set_Up()
{
var target = CreateTarget();
var binding = new Binding
{
Mode = BindingMode.TwoWay,
RelativeSource = new RelativeSource(RelativeSourceMode.TemplatedParent),
Priority = BindingPriority.TemplatedParent,
Path = "Foo",
};
binding.Bind(target.Object, TextBox.TextProperty);
target.Verify(x => x.BindTwoWay(
TextBox.TextProperty,
It.IsAny<ISubject<object>>(),
BindingPriority.TemplatedParent));
}
public void OneWayToSource_Binding_Should_Be_Set_Up()
{
var source = new Source { Foo = "foo" };
var target = new TextBlock { DataContext = source, Text = "bar" };
var binding = new Binding
{
Path = "Foo",
Mode = BindingMode.OneWayToSource,
};
target.Bind(TextBox.TextProperty, binding);
Assert.Equal("bar", source.Foo);
target.Text = "baz";
Assert.Equal("baz", source.Foo);
source.Foo = "quz";
Assert.Equal("baz", target.Text);
}
public void Should_Not_Write_To_Old_DataContext()
{
var vm = new OldDataContextViewModel();
var target = new OldDataContextTest();
var fooBinding = new Binding
{
Path = "Foo",
Mode = BindingMode.TwoWay,
};
var barBinding = new Binding
{
Path = "Bar",
Mode = BindingMode.TwoWay,
};
// Bind Foo and Bar to the VM.
fooBinding.Bind(target, OldDataContextTest.FooProperty);
barBinding.Bind(target, OldDataContextTest.BarProperty);
target.DataContext = vm;
// Make sure the control's Foo and Bar properties are read from the VM
Assert.Equal(1, target.GetValue(OldDataContextTest.FooProperty));
Assert.Equal(2, target.GetValue(OldDataContextTest.BarProperty));
// Set DataContext to null.
target.DataContext = null;
// Foo and Bar are no longer bound so they return 0, their default value.
Assert.Equal(0, target.GetValue(OldDataContextTest.FooProperty));
Assert.Equal(0, target.GetValue(OldDataContextTest.BarProperty));
// The problem was here - DataContext is now null, setting Foo to 0. Bar is bound to
// Foo so Bar also gets set to 0. However the Bar binding still had a reference to
// the VM and so vm.Bar was set to 0 erroneously.
Assert.Equal(1, vm.Foo);
Assert.Equal(2, vm.Bar);
}
public void Should_Use_Supplied_Converter()
{
var target = CreateTarget(null);
var converter = new Mock<IValueConverter>();
var binding = new Binding
{
Converter = converter.Object,
Path = "Foo",
};
var result = binding.CreateSubject(target.Object, TextBox.TextProperty.PropertyType);
Assert.Same(converter.Object, ((ExpressionSubject)result).Converter);
}
public void Should_Use_DefaultValueConverter_When_No_Converter_Specified()
{
var target = CreateTarget(null);
var binding = new Binding
{
Path = "Foo",
};
var result = binding.CreateSubject(target.Object, TextBox.TextProperty.PropertyType);
Assert.IsType<DefaultValueConverter>(((ExpressionSubject)result).Converter);
}
public void DataContext_Binding_Should_Use_Parent_DataContext()
{
var parentDataContext = Mock.Of<IHeadered>(x => x.Header == (object)"Foo");
var parent = new Decorator
{
Child = new Control(),
DataContext = parentDataContext,
};
var binding = new Binding
{
Path = "Header",
};
binding.Bind(parent.Child, Control.DataContextProperty);
Assert.Equal("Foo", parent.Child.DataContext);
parentDataContext = Mock.Of<IHeadered>(x => x.Header == (object)"Bar");
parent.DataContext = parentDataContext;
Assert.Equal("Bar", parent.Child.DataContext);
}
public void Should_Not_Write_To_Old_DataContext()
{
var vm = new OldDataContextViewModel();
var target = new TestSelector();
var itemsBinding = new Binding
{
Path = "Items",
Mode = BindingMode.OneWay,
};
var selectedItemsBinding = new Binding
{
Path = "SelectedItems",
Mode = BindingMode.OneWay,
};
// Bind Items and SelectedItems to the VM.
itemsBinding.Bind(target, TestSelector.ItemsProperty);
selectedItemsBinding.Bind(target, TestSelector.SelectedItemsProperty);
// Set DataContext and SelectedIndex
target.DataContext = vm;
target.SelectedIndex = 1;
// Make sure SelectedItems are written back to VM.
Assert.Equal(new[] { "bar" }, vm.SelectedItems);
// Clear DataContext and ensure that SelectedItems is still set in the VM.
target.DataContext = null;
Assert.Equal(new[] { "bar" }, vm.SelectedItems);
// Ensure target's SelectedItems is now clear.
Assert.Empty(target.SelectedItems);
}
public void Default_BindingMode_Should_Be_Used()
{
var source = new Source { Foo = "foo" };
var target = new TwoWayBindingTest { DataContext = source };
var binding = new Binding
{
Path = "Foo",
};
target.Bind(TwoWayBindingTest.TwoWayProperty, binding);
Assert.Equal("foo", target.TwoWay);
source.Foo = "bar";
Assert.Equal("bar", target.TwoWay);
target.TwoWay = "baz";
Assert.Equal("baz", source.Foo);
}
public void Should_Return_FallbackValue_When_Path_Not_Resolved()
{
var target = new TextBlock();
var source = new Source();
var binding = new Binding
{
Source = source,
Path = "BadPath",
FallbackValue = "foofallback",
};
target.Bind(TextBlock.TextProperty, binding);
Assert.Equal("foofallback", target.Text);
}
public void Default_BindingMode_Should_Be_Used()
{
// Default for TextBox.Text is two-way.
var source = new Source { Foo = "foo" };
var target = new TextBlock { DataContext = source };
var binding = new Binding
{
Path = "Foo",
};
target.Bind(TextBox.TextProperty, binding);
Assert.Equal("foo", target.Text);
source.Foo = "bar";
Assert.Equal("bar", target.Text);
target.Text = "baz";
Assert.Equal("baz", source.Foo);
}
public void Should_Bind_To_Later_Added_Element()
{
ContentControl target;
StackPanel stackPanel;
var root = new TestRoot
{
Child = stackPanel = new StackPanel
{
Children = new Controls.Controls
{
(target = new ContentControl
{
Name = "target",
}),
}
}
};
var binding = new Binding
{
ElementName = "source",
};
binding.Bind(target, ContentControl.ContentProperty);
var source = new TextBlock
{
Name = "source",
Text = "foo",
};
stackPanel.Children.Add(source);
Assert.Same(source, target.Content);
}
public void Should_Return_FallbackValue_When_Invalid_Source_Type()
{
var target = new ProgressBar();
var source = new Source { Foo = "foo" };
var binding = new Binding
{
Source = source,
Path = "Foo",
FallbackValue = 42,
};
target.Bind(ProgressBar.ValueProperty, binding);
Assert.Equal(42, target.Value);
}
public void Default_BindingMode_Should_Be_Used()
{
var target = CreateTarget(null);
var binding = new Binding
{
Path = "Foo",
};
binding.Bind(target.Object, TextBox.TextProperty);
// Default for TextBox.Text is two-way.
target.Verify(x => x.BindTwoWay(
TextBox.TextProperty,
It.IsAny<ISubject<object>>(),
BindingPriority.LocalValue));
}
public void DataContext_Binding_Should_Track_Parent()
{
var parent = new Decorator
{
DataContext = new { Foo = "foo" },
};
var child = new Control();
var binding = new Binding
{
Path = "Foo",
};
binding.Bind(child, Control.DataContextProperty);
Assert.Null(child.DataContext);
parent.Child = child;
Assert.Equal("foo", child.DataContext);
}
public void Unbound_SelectedItems_Should_Be_Cleared_When_DataContext_Cleared()
{
var data = new
{
Items = new[] { "foo", "bar", "baz" },
};
var target = new TestSelector
{
DataContext = data,
Template = Template(),
};
var itemsBinding = new Binding { Path = "Items" };
itemsBinding.Bind(target, TestSelector.ItemsProperty);
Assert.Same(data.Items, target.Items);
target.SelectedItems.Add("bar");
target.DataContext = null;
Assert.Empty(target.SelectedItems);
}
public void Should_Pass_ConverterParameter_To_Supplied_Converter()
{
var target = CreateTarget();
var converter = new Mock<IValueConverter>();
var binding = new Binding
{
Converter = converter.Object,
ConverterParameter = "foo",
Path = "Bar",
};
var result = binding.CreateSubject(target.Object, TextBox.TextProperty.PropertyType);
Assert.Same("foo", ((ExpressionSubject)result).ConverterParameter);
}
