/// <summary>
/// Gets the binding source object of a binding.
/// </summary>
/// <param name="binding">The binding that indicates the source.</param>
/// <param name="target">A target object where the source might be found.</param>
/// <returns>The source object that is described by the binding.</returns>
protected object getBindingSource(Binding binding, DependencyObject target)
{
if (binding == null)
{
return(null);
}
var targetAsFE = target as FrameworkElement;
// -- Case where source is explicitely provided: --
if (binding.Source != null)
{
// If a target object is provided:
if (targetAsFE != null)
{
// And if the binding source is the datacontext of the target object, then add
// the object the to list of datacontexts to be followed:
if (targetAsFE.IsLoaded && targetAsFE.DataContext == binding.Source)
{
if (!DataContextBindings.ContainsKey(binding))
{
DataContextBindings.Add(binding, targetAsFE);
}
return(binding.Source);
}
// Else we cannot know now so report assessment at target loading:
else if (!targetAsFE.IsLoaded)
{
UnresolvedBindings.Add(binding, targetAsFE);
}
}
else
{
return(binding.Source);
}
}
// -- In other cases that depends on datacontext or visual tree --
else if (target != null)
{
// -- Case where relative source is provided: --
if (binding.RelativeSource != null)
{
var relative = BindingHelpers.GetSourceFromRelativeSource(binding.RelativeSource, target);
if (relative == null && targetAsFE != null && !targetAsFE.IsLoaded)
{
if (!UnresolvedBindings.ContainsKey(binding))
{
UnresolvedBindings.Add(binding, targetAsFE);
}
}
}
// -- Case where no source is given at all: --
else if (binding.Source == null && binding.RelativeSource == null &&
string.IsNullOrWhiteSpace(binding.ElementName) && targetAsFE != null)
{
if (targetAsFE.IsLoaded)
{
if (!DataContextBindings.ContainsKey(binding))
{
DataContextBindings.Add(binding, targetAsFE);
}
return(targetAsFE.DataContext);
}
else if (!UnresolvedBindings.ContainsKey(binding))
{
UnresolvedBindings.Add(binding, targetAsFE);
}
}
}
return(null);
}
