private _propertyTree CreatePropertyTree(Expression exp, _propertyTree child = null)
{
var mExp = exp as MemberExpression;
if (mExp == null)
{
return(null);
}
var pi = mExp.Member as PropertyInfo;
if (pi == null)
{
throw new ArgumentException("式木からプロパティを取得できません。");
}
var tree = new _propertyTree(pi, child);
var parent = CreatePropertyTree(mExp.Expression, tree);
if (parent != null)
{
return(parent);
}
return(tree);
}
private IDisposable createChildWeakEventListener <TChild>(PropertyTreeChangedWeakEventListener <TChild> listener, _propertyTree tree, PropertyChangedEventHandler handler)
where TChild : INotifyPropertyChanged
{
Action createCldLstnr = null;
Action dispCldLstnr = null;
if (tree != null)
{
var methodName = MethodBase.GetCurrentMethod().Name;
createCldLstnr = () => {
var pi = tree.PropertyInfo;
var getterMi = pi.GetGetMethod();
var getterType = typeof(Func <,>).MakeGenericType(pi.ReflectedType, pi.PropertyType);
var childValue = Delegate
.CreateDelegate(getterType, getterMi)
.DynamicInvoke(listener._eventSrc);
// プロパティに対してリスナーを作成。
var childType = childValue.GetType();
object childListener = null;
if (typeof(INotifyPropertyChanged).IsAssignableFrom(childType))
{
childListener = typeof(PropertyTreeChangedWeakEventListener <>)
.MakeGenericType(childType)
.GetConstructor(new Type[] { childType })
.Invoke(new object[] { childValue });
dispCldLstnr = () => {
(childListener as IDisposable)?.Dispose();
};
listener
.GetType()
.GetMethod(methodName, BindingFlags.NonPublic | BindingFlags.Public | BindingFlags.Instance)
.MakeGenericMethod(childType)
.Invoke(listener, new object[] { childListener, tree.Child, handler });
}
};
}
createCldLstnr?.Invoke();
return(new LivetWeakEventListener <PropertyChangedEventHandler, PropertyChangedEventArgs>(
h => new PropertyChangedEventHandler(h),
h => {
_eventSrc.PropertyChanged += h;
},
h => {
_eventSrc.PropertyChanged -= h;
dispCldLstnr?.Invoke();
},
(s, e) => {
if (e.PropertyName == tree.PropertyInfo.Name)
{
handler(s, e);
dispCldLstnr?.Invoke();
createCldLstnr?.Invoke();
}
}));
}
public _propertyTree(PropertyInfo pi, _propertyTree child)
{
PropertyInfo = pi;
Child = child;
}