public static void DataContextChanged(object target, AttachedPropertyChangedEventArgs e)
{
if (e.NewValue != null)
{
// bind "target" to new value
// target.Bind(e.NewValue, --template--)
// how do we get the binding information for "target" in an easy manner
// in xaml this would be defined in the view. perhaps we do the same
// by either using attributes on target or having the view register
// perhaps the view can register define a way of binding
}
}
public static void DataContextChanged(object target, AttachedPropertyChangedEventArgs e)
{
if (e.NewValue != null)
{
// bind "target" to new value
// target.Bind(e.NewValue, --template--)
// how do we get the binding information for "target" in an easy manner
// in xaml this would be defined in the view. perhaps we do the same
// by either using attributes on target or having the view register
// perhaps the view can register define a way of binding
}
}
/// <summary>
/// Handles changes to the attached object and calls Attach or Detatch
/// </summary>
/// <param name='targetObject'>
/// The object to which we are attaching the behaviour
/// </param>
/// <param name='e'>
/// The changed property arguments
/// </param>
public static void AttachedPropertyChanged(object targetObject, AttachedPropertyChangedEventArgs e)
{
var behaviour = targetObject as Behaviour;
if (behaviour != null)
{
if (e.OldValue != null)
{
behaviour.Detach(e.OldValue);
}
behaviour.Attach(e.NewValue);
}
}
/// <summary>
/// Sets the value of an AttachedProperty for an object
/// </summary>
/// <param name='instance'>
/// The instance for which the value is being set
/// </param>
/// <param name='property'>
/// The AttachedProperty that defines the value being set
/// </param>
/// <param name='value'>
/// The value of the property
/// </param>
public static void SetValue(this object instance, AttachedProperty property, object value)
{
var current = GetCurrent(instance, property, true);
var oldValue = current.Value;
current.Value = value;
if (oldValue != value && property.Metadata.ChangeCallback != null)
{
var args = new AttachedPropertyChangedEventArgs(property, value, oldValue);
property.Metadata.ChangeCallback(instance, args);
}
}
/// <summary>
/// Sets the value of an AttachedProperty for an object
/// </summary>
/// <param name='instance'>
/// The instance for which the value is being set
/// </param>
/// <param name='property'>
/// The AttachedProperty that defines the value being set
/// </param>
/// <param name='value'>
/// The value of the property
/// </param>
public static void SetValue(this object instance, AttachedProperty property, object value)
{
var current = GetCurrent(instance, property, true);
var oldValue = current.Value;
current.Value = value;
if (oldValue != value && property.Metadata.ChangeCallback != null)
{
var args = new AttachedPropertyChangedEventArgs(property, value, oldValue);
property.Metadata.ChangeCallback(instance, args);
}
}