#
# Silverlight Spy databinding Inspector
#
from System.Windows import *
from System.Windows.Data import *
from FirstFloor.SilverlightSpy.Interop import *

def IsValidBinding(binding, context):
    try:
        path = binding.Path.Path
        if (len(path) > 0):
            eval("context." + path)
            return True
        else:
            return context != None
    except:
        return False

propertyCount = 0
bindingCount = 0
invalidBindingCount = 0

for element in VisualTreeHelperEx.Descendants(Application.Current.RootVisual):
    for property in DependencyObjectExtensions.DependencyProperties(element):
        propertyCount += 1
        value = element.ReadLocalValue(property.Property)
        if (isinstance(value, BindingExpression)):
            bindingCount += 1 
            binding = value.ParentBinding
            
            isvalid = IsValidBinding(binding, value.DataItem)
            if (not(isvalid)):
                invalidBindingCount += 1
            
            source = 'None'
            if (value.DataItem != None):
                source = value.DataItem.GetType().FullName
                
            print 'Binding source: ' + source
            print 'Binding target: ' + element.GetType().Name + '.' + property.PropertyName
            print 'Binding       : ' + Formatter.Format(binding)
            print 'Is valid      : ' + str(IsValidBinding(binding, value.DataItem))
            print

print 'Checked ' + str(propertyCount) + ' dependency properties. Found ' + str(bindingCount) + ' bindings where ' + str(invalidBindingCount) + ' are invalid'