/// <summary>
/// When overridden in a derived class, returns a <see cref="Style"/> based on custom logic.
/// </summary>
/// <param name="item">The content.</param>
/// <param name="container">The element to which the style will be applied.</param>
/// <returns>
/// Returns an application-specific style to apply; otherwise, null.
/// </returns>
public override Style SelectStyle(object item, DependencyObject container)
{
Expander expander = container as Expander;
if (null == expander)
{
return(null);
}
string styleKey = "ExpanderGroupStyle";
XmlElement element = item as XmlElement;
if (null != element)
{
if (null != element.Attributes["UseAlternateStyle"])
{
bool useAlternateStyle;
if (bool.TryParse(element.Attributes["UseAlternateStyle"].Value, out useAlternateStyle))
{
if (useAlternateStyle)
{
styleKey = "ExpanderGroupAlternateStyle";
}
}
}
}
return(expander.FindResource(styleKey) as Style);
}
public void ToggleButtonTemplateTest()
{
// for code coverage
UITester.Dispatcher.Invoke(() =>
{
var template = (ControlTemplate)testExpander.FindResource("PlusExpanderToggleButtonTemplate");
testExpander.ToggleButtonTemplate = template;
Assert.AreEqual(testExpander.ToggleButtonTemplate, template);
testExpander.ToggleButtonTemplate = null;
Assert.IsNull(testExpander.ToggleButtonTemplate);
testExpander.ToggleButtonTemplate = template;
Assert.AreEqual(testExpander.ToggleButtonTemplate, template);
});
}
