public void DataContextTest()
{
ContentPresenter c = (ContentPresenter)XamlReader.Load(@"
<ContentPresenter xmlns=""http://schemas.microsoft.com/client/2007"">
<ContentPresenter.ContentTemplate>
<DataTemplate>
<Rectangle DataContext=""{Binding DataContext}"" />
</DataTemplate>
</ContentPresenter.ContentTemplate>
<Rectangle />
</ContentPresenter>");
Assert.IsNull(c.DataContext);
Assert.AreEqual(DependencyProperty.UnsetValue, c.ReadLocalValue(ContentPresenter.DataContextProperty), "unset 1");
c.Content = new Rectangle();
Assert.IsNull(c.DataContext);
Assert.AreEqual(DependencyProperty.UnsetValue, c.ReadLocalValue(ContentPresenter.DataContextProperty), "unset 2");
CreateAsyncTest(c,
() => {
Assert.IsNull(c.DataContext);
Assert.AreEqual(DependencyProperty.UnsetValue, c.ReadLocalValue(ContentPresenter.DataContextProperty), "unset 3");
},
() => c.Content = new Rectangle(),
() => {
Assert.AreEqual(DependencyProperty.UnsetValue, c.ReadLocalValue(ContentPresenter.DataContextProperty), "unset 4");
Assert.IsNull(c.DataContext);
}
);
}
public void ChangeDefaultTemplate()
{
ContentControl c = (ContentControl)XamlReader.Load(@"
<ContentControl xmlns=""http://schemas.microsoft.com/client/2007"">
<ContentControl.Template>
<ControlTemplate>
<ContentPresenter />
</ControlTemplate>
</ContentControl.Template>
</ContentControl>");
c.Content = new ConcreteFrameworkElement();
c.ContentTemplate = new DataTemplate();
ContentPresenter p = null;
CreateAsyncTest(c,
() => Assert.VisualChildren(c, "#1",
new VisualNode <ContentPresenter> ("#2", (pr) => p = pr)
),
() => {
Assert.IsNull(p.DataContext, "#3");
Assert.AreEqual(c.Content, p.Content, "#4");
},
() => {
Assert.AreSame(c.Content, p.Content);
Assert.IsInstanceOfType <TemplateBindingExpression> (p.ReadLocalValue(ContentPresenter.ContentProperty), "#5");
Assert.AreSame(c.ContentTemplate, p.ContentTemplate);
Assert.IsInstanceOfType <TemplateBindingExpression> (p.ReadLocalValue(ContentPresenter.ContentTemplateProperty), "#6");
},
() => {
Assert.VisualChildren(p, "#7");
}
);
}
public void DataTemplateTest4()
{
ContentControl c = (ContentControl)XamlReader.Load(@"
<ContentControl xmlns=""http://schemas.microsoft.com/client/2007"">
<ContentControl.ContentTemplate>
<DataTemplate>
<Grid>
<ContentPresenter />
</Grid>
</DataTemplate>
</ContentControl.ContentTemplate>
</ContentControl>");
c.Content = new ConcreteFrameworkElement();
ContentPresenter p = null;
CreateAsyncTest(c, () =>
Assert.VisualChildren(c, "#1",
new VisualNode <ContentPresenter> ("#a",
new VisualNode <Grid> ("#b",
new VisualNode <ContentPresenter> ("#c", pr => p = pr)
)
)
),
() => {
Assert.AreEqual(DependencyProperty.UnsetValue, p.ReadLocalValue(ContentPresenter.ContentProperty), "#2");
Assert.AreEqual(DependencyProperty.UnsetValue, p.ReadLocalValue(ContentPresenter.ContentTemplateProperty), "#3");
}
);
}
public void DataContextTest7()
{
// A null content is copied to the datacontext too.
ContentPresenter presenter = new ContentPresenter();
CreateAsyncTest(presenter,
() => {
presenter.Content = new object();
}, () => {
Assert.AreEqual(presenter.Content, presenter.ReadLocalValue(ContentPresenter.DataContextProperty), "#1");
presenter.Content = null;
}, () => {
Assert.AreEqual(null, presenter.ReadLocalValue(ContentPresenter.DataContextProperty), "#2");
}
);
}
public void MultiplePresenters()
{
ControlTemplate template = CreateTemplate(@"
<ContentControl>
<Grid>
<ContentPresenter/>
<ContentPresenter/>
<ContentPresenter/>
</Grid>
</ContentControl>
");
ContentControl c = new ContentControl {
Template = template,
Content = "content"
};
CreateAsyncTest(c, () => {
Grid grid = null;
Assert.VisualChildren(c,
new VisualNode <ContentControl> ("#1",
new VisualNode <ContentPresenter> ("#2",
new VisualNode <Grid> ("#3", g => grid = g, null)
)
)
);
for (int i = 0; i < 3; i++)
{
ContentPresenter p = (ContentPresenter)grid.Children [i];
Assert.IsInstanceOfType <TemplateBindingExpression> (p.ReadLocalValue(ContentPresenter.ContentProperty), "#4." + i);
Assert.AreEqual("content", p.Content, "#5." + i);
}
});
}
public void DataContextTest_DataContextUpdatesAsync()
{
var presenter = new ContentPresenter();
presenter.SetBinding(ContentPresenter.DataContextProperty, new Binding());
Assert.IsInstanceOfType <BindingExpression> (presenter.ReadLocalValue(ContentPresenter.DataContextProperty), "#1");
presenter.Content = new object();
Assert.IsInstanceOfType <BindingExpression> (presenter.ReadLocalValue(ContentPresenter.DataContextProperty), "#2");
TestPanel.Children.Add(presenter);
Assert.IsInstanceOfType <BindingExpression> (presenter.ReadLocalValue(ContentPresenter.DataContextProperty), "#3");
Enqueue(() => {
Assert.AreSame(presenter.Content, presenter.ReadLocalValue(ContentPresenter.DataContextProperty), "#4");
});
EnqueueTestComplete();
}
public void DataContextTest2()
{
// Changing the content updates the datacontext
ContentPresenter c = new ContentPresenter();
c.Content = new object();
CreateAsyncTest(c,
() => {
Assert.AreEqual(c.Content, c.DataContext, "#1");
Assert.AreEqual(c.Content, c.ReadLocalValue(ContentPresenter.DataContextProperty), "#1b");
c.Content = new object();
},
() => {
Assert.AreEqual(c.Content, c.DataContext, "#2");
Assert.AreEqual(c.Content, c.ReadLocalValue(ContentPresenter.DataContextProperty), "#2b");
}
);
}
public void DataContextTest5()
{
// When the ContentPresenter is in the tree, its DataContext gets set to ContentPresenter.Content
// when it is loaded
object o = new object();
ContentPresenter c = new ContentPresenter {
DataContext = o
};
Assert.AreEqual(o, c.DataContext, "#1");
CreateAsyncTest(c,
() => {
Assert.IsNull(c.DataContext, "#2");
Assert.IsNull(c.ReadLocalValue(ContentPresenter.DataContextProperty), "#2b");
},
() => {
c.DataContext = o;
Assert.AreEqual(o, c.DataContext, "#3");
Assert.AreEqual(o, c.ReadLocalValue(ContentPresenter.DataContextProperty), "#3b");
},
() => Assert.AreEqual(o, c.DataContext, "#4")
);
}
public void DataContextTest5b()
{
// When the ContentPresenter is in the tree, its DataContext gets set to ContentPresenter.Content
// when it is loaded
object content = new object();
ContentPresenter c = new ContentPresenter {
Content = content
};
CreateAsyncTest(c,
() => {
Assert.AreEqual(content, c.DataContext, "#1");
Assert.AreEqual(content, c.ReadLocalValue(FrameworkElement.DataContextProperty), "#2");
}
);
}