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using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Collections.Specialized;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace Tango.SharedUI.Components
{
public class SelectedObjectCollection<T> : ObservableCollection<SelectedObject<T>>
{
private Func<T, T, bool> _compareFunc;
public event EventHandler SelectionChanged;
public ObservableCollection<T> Source { get; set; }
public ObservableCollection<T> SynchedSource { get; set; }
public SelectedObjectCollection(ObservableCollection<T> source, ObservableCollection<T> synchedSource, Func<T, T, bool> compareFunc)
{
_compareFunc = compareFunc;
SynchedSource = synchedSource;
Source = source;
foreach (var item in source)
{
var selectedItem = new SelectedObject<T>(item, _compareFunc == null ? synchedSource.Contains(item) : synchedSource.ToList().Exists(x => _compareFunc(x, item)));
this.Add(selectedItem);
selectedItem.IsSelectedChanged += SelectedItem_IsSelectedChanged;
}
}
public SelectedObjectCollection(ObservableCollection<T> source, ObservableCollection<T> synchedSource) : this(source, synchedSource, null)
{
}
private void SelectedItem_IsSelectedChanged(object sender, EventArgs e)
{
SelectedObject<T> item = sender as SelectedObject<T>;
if (item.IsSelected)
{
if (_compareFunc == null)
{
if (!SynchedSource.Contains(item.Data))
{
SynchedSource.Add(item.Data);
}
}
else
{
if (!SynchedSource.ToList().Exists(x => _compareFunc(x, item.Data)))
{
SynchedSource.Add(item.Data);
}
}
}
else
{
if (_compareFunc == null)
{
SynchedSource.Remove(item.Data);
}
else
{
foreach (var s in SynchedSource.ToList())
{
if (_compareFunc(s, item.Data))
{
SynchedSource.Remove(s);
}
}
}
}
SelectionChanged?.Invoke(this, new EventArgs());
}
}
}
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