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using System.Reflection;
// Copyright (c) 2013-2019 Bruyère Jean-Philippe jp_bruyere@hotmail.com
//
// This code is licensed under the MIT license (MIT) (http://opensource.org/licenses/MIT)
using System;
using System.Collections.Generic;
using System.Linq;
using System.Collections;
namespace Crow
{
public class ObservableList<T> : IList<T>, IObservableList, IValueChange, ICollection {
#region IValueChange implementation
public event EventHandler<ValueChangeEventArgs> ValueChanged;
public virtual void NotifyValueChanged (string MemberName, object _value)
{
ValueChanged?.Invoke (this, new ValueChangeEventArgs (MemberName, _value));
}
#endregion
#region IObservableList implementation
public event EventHandler<ListChangedEventArg> ListAdd;
public event EventHandler<ListChangedEventArg> ListRemove;
public event EventHandler<ListChangedEventArg> ListEdit;
public event EventHandler<ListClearEventArg> ListClear;
#endregion
List<T> items;
public ObservableList() {
items = new List<T>();
}
public ObservableList (IEnumerable<T> collection) {
items = new List<T> (collection);
}
int selectedIndex = -1;
public int SelectedIndex {
get => selectedIndex;
set {
if (selectedIndex == value)
return;
if (value > Count - 1)
selectedIndex = Count - 1;
else
selectedIndex = value;
NotifyValueChanged ("SelectedIndex", selectedIndex);
NotifyValueChanged ("SelectedItem", SelectedItem);
}
}
public T SelectedItem {
get => selectedIndex < 0 ? default(T) : this [selectedIndex];
set {
this [selectedIndex] = value;
}
}
public int Count => items.Count;
public bool IsReadOnly => false;
public bool IsSynchronized => throw new NotImplementedException();
public object SyncRoot => throw new NotImplementedException();
public T this[int index] {
get => items[index];
set {
if (items[index] == null) {
if (value == null)
return;
}else if (items[index].Equals (value))
return;
Replace (items[index], value);
}
}
public void Add (T elem) {
items.Add (elem);
ListAdd.Raise (this, new ListChangedEventArg (this.Count - 1, elem));
SelectedIndex = this.Count - 1;
}
public void Insert (int index, T elem) {
items.Insert (index, elem);
ListAdd.Raise (this, new ListChangedEventArg (index, elem));
SelectedIndex = index;
}
public bool Remove (T elem) {
int idx = IndexOf (elem);
if (idx < 0)
return false;
else
items.RemoveAt (idx);
ListRemove.Raise (this, new ListChangedEventArg (idx, elem));
return true;
}
public void Clear ()
{
ListClearEventArg eventArg = new ListClearEventArg (this.Cast<object>());
items.Clear ();
ListClear.Raise (this, eventArg);
}
public void Remove () {
if (selectedIndex < 0)
return;
RemoveAt (selectedIndex);
SelectedIndex--;
}
public void Insert ()
{
items.Insert (selectedIndex+1, default(T));
SelectedIndex++;
ListAdd.Raise (this, new ListChangedEventArg (selectedIndex, SelectedItem));
}
public void Replace (T oldValue, T newValue) {
int idx = IndexOf (oldValue);
items[idx] = newValue;
ListEdit.Raise (this, new ListChangedEventArg (idx, newValue));
}
public void RaiseEdit () {
if (selectedIndex < 0)
return;
ListEdit.Raise (this, new ListChangedEventArg (selectedIndex, SelectedItem));
}
public void RemoveAt (int index)
{
items.RemoveAt (index);
ListRemove.Raise (this, new ListChangedEventArg (index, null));
}
public void RaiseEditAt (int index) {
ListEdit.Raise (this, new ListChangedEventArg (index, this[index]));
}
public static ObservableList<T> Parse (string str) {
ObservableList<T> tmp = new ObservableList<T>();
if (!string.IsNullOrEmpty (str)) {
Type t = typeof(T);
if (t.IsEnum) {
foreach (string s in str.Split(';'))
tmp.Add((T)Enum.Parse(t, s));
} else {
MethodInfo miParse = t.GetMethod ("Parse",
BindingFlags.Static | BindingFlags.Public, Type.DefaultBinder, new Type [] {typeof (string)}, null);
if (miParse == null)
throw new Exception ("no Parse method found for: " + t.FullName);
foreach (string s in str.Split(';'))
tmp.Add((T)miParse.Invoke (null, new object[] {s}));
}
}
return tmp;
}
public int IndexOf(T item) => items.IndexOf (item);
public bool Contains(T item) => items.Contains (item);
public void CopyTo(T[] array, int arrayIndex) => items.CopyTo (array, arrayIndex);
public IEnumerator<T> GetEnumerator() => items.GetEnumerator ();
IEnumerator IEnumerable.GetEnumerator() => items.GetEnumerator ();
public void CopyTo(Array array, int index) => items.ToArray().CopyTo (array, index);
}
}
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