// static method invoked when Group property has changed value
// here we need to attach event handler defined if DPGroup, so it will fire from inside Group property,
// when Group.MyProperty1 will change value
static void OnGroupPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
DPTest control = (DPTest)d;
DPGroup oldGroup = e.OldValue as DPGroup;
// removing event handler from prevoius instance of DBGroup
if (oldGroup != null)
{
oldGroup.PropertyChanged -= new PropertyChangedEventHandler(control.group_PropertyChanged);
}
DPGroup newGroup = e.NewValue as DPGroup;
// adding event handler to new instance of DBGroup
if (newGroup != null)
{
newGroup.PropertyChanged += new PropertyChangedEventHandler(control.group_PropertyChanged);
}
DPTest g = d as DPTest;
if (g != null)
{
control.UpdateTextBox();
}
}
// static method invoked when MyProperty1 has changed value
static void OnPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
DPGroup g = d as DPGroup;
if (g != null)
{
g.MyProperty1 = (int)e.NewValue;
// invoking event handler, to notify parent class about changed value of DP
if (g.PropertyChanged != null)
{
g.PropertyChanged(g, null);
}
}
}
static void OnGroupPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
DPTest control = (DPTest)d;
DPGroup oldGroup = e.OldValue as DPGroup;
if (oldGroup != null)
{
oldGroup.PropertyChanged -= new PropertyChangedEventHandler(control.group_PropertyChanged);
}
DPGroup newGroup = e.NewValue as DPGroup;
if (newGroup != null)
{
newGroup.PropertyChanged += new PropertyChangedEventHandler(control.group_PropertyChanged);
}
control.UpdateTextBox();
}
