public void Attach(NodeItem nodeItem)
{
myAttachedView = nodeItem;
myAttachedView.IsFilteredOut = IsFilteredOut;
var expr = myAttachedView.GetBindingExpression(TreeViewItem.IsExpandedProperty);
if (expr != null)
{
// property bound to INode impl --> this is the master
IsExpanded = myAttachedView.IsExpanded;
}
else
{
// no binding --> we are the master
myAttachedView.IsExpanded = IsExpanded;
}
}
private bool SetViewProperty <T>(T value, [CallerMemberName] string propertyName = null)
{
if (myAttachedView == null)
{
return(false);
}
var dependencyPropertyField = myAttachedView.GetType()
.GetField(propertyName + "Property", BindingFlags.Static | BindingFlags.Public | BindingFlags.FlattenHierarchy);
if (dependencyPropertyField != null)
{
var expr = myAttachedView.GetBindingExpression((DependencyProperty)dependencyPropertyField.GetValue(myAttachedView));
if (expr != null)
{
// If this is a DependencyProperty with binding we have to update the source instead of setting the
// DependencyProperty because setting the DependencyProperty directly will kill the binding
var prop = expr.ResolvedSource.GetType().GetProperty(expr.ResolvedSourcePropertyName);
if (!object.Equals(prop.GetValue(expr.ResolvedSource), value))
{
prop.SetValue(expr.ResolvedSource, value);
expr.UpdateTarget();
return(true);
}
return(false);
}
}
{
var prop = myAttachedView.GetType().GetProperty(propertyName);
if (!object.Equals(prop.GetValue(myAttachedView), value))
{
prop.SetValue(myAttachedView, value);
return(true);
}
}
return(false);
}