/// <inheritdoc />
/// <summary>
/// When implemented in a derived class, returns an object that is provided as the value of the target property for this markup extension.
/// </summary>
/// <param name="serviceProvider">A service provider helper that can provide services for the markup extension.</param>
/// <returns>
/// The object value to set on the property where the extension is applied.
/// </returns>
public override object ProvideValue(IServiceProvider serviceProvider)
{
Contract.Assume(serviceProvider != null);
var rootObjectProvider = serviceProvider.GetService <IRootObjectProvider>();
if (rootObjectProvider == null)
{
return(null);
}
_rootObject = rootObjectProvider.RootObject as DependencyObject;
if (_rootObject == null)
{
return(null);
}
if (DesignerProperties.GetIsInDesignMode(_rootObject))
{
return(null);
}
if (AllowRecomposition)
{
var provideValueTarget = serviceProvider.GetService <IProvideValueTarget>();
if (provideValueTarget != null)
{
_targetObject = provideValueTarget.TargetObject;
_targetProperty = provideValueTarget.TargetProperty;
}
_tracker = _rootObject.Track(ExportProviderLocator.ExportProviderProperty);
_tracker.Changed += (_, __) => ExportProvider_Changed();
RegisterForChangeEvents();
}
else
{
_exportProvider = _rootObject.GetExportProvider();
}
return(Value);
}
/// <inheritdoc />
/// <summary>
/// When implemented in a derived class, returns an object that is provided as the value of the target property for this markup extension.
/// </summary>
/// <param name="serviceProvider">A service provider helper that can provide services for the markup extension.</param>
/// <returns>
/// The object value to set on the property where the extension is applied.
/// </returns>
public override object ProvideValue(IServiceProvider serviceProvider)
{
var rootObjectProvider = serviceProvider.GetService <IRootObjectProvider>();
if (rootObjectProvider == null)
{
return(null);
}
_rootObject = rootObjectProvider.RootObject as FrameworkElement;
if (_rootObject == null)
{
return(null);
}
if (DesignerProperties.GetIsInDesignMode(_rootObject))
{
return(null);
}
if (AllowRecomposition)
{
var provideValueTarget = serviceProvider.GetService <IProvideValueTarget>();
if (provideValueTarget != null)
{
_targetObject = provideValueTarget.TargetObject;
_targetProperty = provideValueTarget.TargetProperty;
}
_tracker = _rootObject.Track(ExportProviderLocator.ExportProviderProperty);
_rootObject.Loaded += RootObject_Loaded;
_rootObject.Unloaded += RootObject_Unloaded;
}
else
{
_exportProvider = _rootObject.GetExportProvider();
}
return(Value);
}
/// <summary>
/// When implemented in a derived class, returns an object that is provided as the value of the target property for this markup extension.
/// </summary>
/// <param name="serviceProvider">A service provider helper that can provide services for the markup extension.</param>
/// <returns>
/// The object value to set on the property where the extension is applied.
/// </returns>
public override object ProvideValue(IServiceProvider serviceProvider)
{
Contract.Assume(serviceProvider != null);
var rootObjectProvider = serviceProvider.GetService<IRootObjectProvider>();
if (rootObjectProvider == null)
return null;
_rootObject = rootObjectProvider.RootObject as DependencyObject;
if (_rootObject == null)
return null;
if (DesignerProperties.GetIsInDesignMode(_rootObject))
return null;
if (AllowRecomposition)
{
var provideValueTarget = serviceProvider.GetService<IProvideValueTarget>();
if (provideValueTarget != null)
{
_targetObject = provideValueTarget.TargetObject;
_targetProperty = provideValueTarget.TargetProperty;
}
_tracker = _rootObject.Track(ExportProviderLocator.ExportProviderProperty);
_tracker.Changed += (_, __) => ExportProvider_Changed();
RegisterForChangeEvents();
}
else
{
_exportProvider = _rootObject.GetExportProvider();
}
return Value;
}
